Converting html files with *ngFor to pdf in Java

Converting html files with *ngFor to pdf in Java - java

I have to generate documents in my Java Web application (Maven, runs on a server) and have to insert data from a Java class into this document.
I would like to be able to write a HTML file with placeholders. The placeholder should be replaced from the application with data from a Java class.
I also would like to be able to use conditionals like *ngFor (e.g. inserting a list into a ) or *ngIf from Angular (or attributes with a similar function).
Does anyone know a library for this?
I have a good knowledge of Java, HTML etc. so using such a library (if there is one) will not be a problem for me
In the meantime I've written a little script myself. In case someone needs something similar, I've included it in an answer

In the meantime I have searched further and unfortunately I have not found a suitable solution so far. Therefore, I have now set about programming a solution myself. Much less effort is required than expected. Here is my current code. It is currently a rough draft and certainly needs some improvement.
package com.XYZ.file.bo;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.InputStream;
import java.io.StringWriter;
import java.lang.reflect.InvocationTargetException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.XYZ.file.service.FileService;
import com.XYZ.servicelocator.ServiceLocator;
import com.XYZ.util.TechnicalException;
import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
public class TemplateGeneratorBO {
private FileService fileService;
private static final String DOC_TEMPLATE_DIR = FileBO.BASE_DIR + "templates/";
public File generateDoc(String tempFileName, String saveFolder, String saveFileName, Object entity) {
String htmlDoc = parseHtmlDoc(tempFileName, entity);
htmlDoc = replaceSpecialChars(htmlDoc);
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
ConverterProperties converterProperties = new ConverterProperties();
HtmlConverter.convertToPdf(htmlDoc, outStream, converterProperties);
InputStream inStream = new ByteArrayInputStream(outStream.toByteArray());
saveFolder += "/" + callGetter(entity, "id") + "/templates";
if (!getFileService().createAndSaveFile(saveFolder, saveFileName + ".pdf", inStream)) {
int counter = 0;
boolean success = false;
do {
counter++;
success = getFileService().createAndSaveFile(saveFolder, saveFileName + "-" + counter + ".pdf",
inStream);
} while (!success);
return getFileService().getFile(saveFolder, saveFileName + "-" + counter + ".pdf");
}
return getFileService().getFile(saveFolder, saveFileName + ".pdf");
}
private String parseHtmlDoc(String fileName, Object entity) {
try {
File htmlFile = new File(DOC_TEMPLATE_DIR + fileName);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(htmlFile);
doc.getDocumentElement().normalize();
Element elm = doc.getDocumentElement();
NodeList headList = elm.getElementsByTagName("head");
NodeList bodyList = elm.getElementsByTagName("body");
verifyTemplate(fileName, elm, headList, bodyList);
Node head = headList.item(0);
String html = "<html>" + xmlToString(head) + "<body>";
html += nodeToString(bodyList.item(0),
newTempEntList(new TemplateGenEntity(entity.getClass().getSimpleName(), entity)));
html += "</body></html>";
return html;
} catch (Exception exc) {
throw new TechnicalException("DocGenerator Exception with file " + fileName, exc);
}
}
private String nodeToString(Node parentNode, List<TemplateGenEntity> entities)
throws TransformerException, ScriptException {
NodeList nodes = parentNode.getChildNodes();
StringBuilder string = new StringBuilder("");
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element elm = (Element) node;
string.append(elementToString(elm, entities));
} else {
string.append(insertValues(xmlToString(node), entities));
}
}
return string.toString();
}
private String elementToString(Element elm, List<TemplateGenEntity> entities)
throws ScriptException, TransformerException {
if (!proofNgIf(elm, entities)) {
return "";
}
if (elm.hasAttribute("ngFor")) {
return ngForElementToString(elm, entities);
}
return "<" + elm.getNodeName() + getElementAttributes(elm) + ">" + nodeToString(elm, entities) + "</"
+ elm.getNodeName() + ">";
}
#SuppressWarnings("unchecked")
private String ngForElementToString(Element elm, List<TemplateGenEntity> entities)
throws ScriptException, TransformerException {
String attrs = getElementAttributes(elm);
String ngFor = elm.getAttribute("ngFor");
String[] ngForList = ngFor.split(" of ");
StringBuilder string = new StringBuilder();
ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
for (TemplateGenEntity ent : entities) {
engine.put(ent.getEntityName(), ent.getEntity());
}
List<Object> list = (List<Object>) engine.eval(ngForList[1]);
for (Object obj : list) {
string.append("<" + elm.getNodeName() + attrs + ">"
+ nodeToString(elm, newTempEntList(entities, new TemplateGenEntity(ngForList[0], obj))) + "</"
+ elm.getNodeName() + ">");
}
return string.toString();
}
/**
*
* #return true if no ngIf or ngIf condition is true
* #throws ScriptException
*/
private boolean proofNgIf(Element elm, List<TemplateGenEntity> entities) throws ScriptException {
if (!elm.hasAttribute("ngIf")) {
return true;
}
String ngIf = elm.getAttribute("ngIf");
if (ngIf.isBlank()) {
throw new TechnicalException("Document template contains empty ngIf!");
}
ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
for (TemplateGenEntity ent : entities) {
engine.put(ent.getEntityName(), ent.getEntity());
}
return (boolean) engine.eval(ngIf);
}
private String insertValues(String strIn, List<TemplateGenEntity> entities) throws ScriptException {
StringBuilder str = new StringBuilder(strIn);
int begin = str.indexOf("{{");
int end = str.indexOf("}}") + 2;
while (begin != -1 && end != 1) {
String var = str.substring(begin, end);
var = var.replace("{{", "");
var = var.replace("}}", "");
ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
for (TemplateGenEntity ent : entities) {
engine.put(ent.getEntityName(), ent.getEntity());
}
Object val = engine.eval(var);
String valStr = objectToStr(val);
str = str.replace(begin, end, valStr);
begin = str.indexOf("{{");
end = str.indexOf("}}") + 2;
}
return str.toString();
}
private String xmlToString(Node node) throws TransformerException {
StringWriter writer = new StringWriter();
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
transformer.setOutputProperty(OutputKeys.INDENT, "no");
transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "yes");
transformer.transform(new DOMSource(node), new StreamResult(writer));
return writer.toString();
}
private String replaceSpecialChars(String str) {
str = str.replace(">", ">");
return str;
}
private String getElementAttributes(Element elm) {
StringBuilder attrStr = new StringBuilder();
NamedNodeMap attrs = elm.getAttributes();
for (int i = 0; i < attrs.getLength(); i++) {
Attr attr = (Attr) attrs.item(i);
String attrName = attr.getName();
String attrVal = attr.getValue();
if (attrName.equals("ngIf") || attrName.equals("ngFor")) {
continue;
}
attrStr.append(" " + attrName + "=\"" + attrVal + "\"");
}
return attrStr.toString();
}
private void verifyTemplate(String fileName, Element elm, NodeList head, NodeList body) {
if (!elm.getNodeName().equalsIgnoreCase("html")) {
throw new TechnicalException("Document template " + fileName + " doesn't starts with html node!");
}
if (head.getLength() != 1 || head.item(0) == null) {
throw new TechnicalException("Document template " + fileName + " doesn't contains head!");
}
if (body.getLength() != 1 || head.item(0) == null) {
throw new TechnicalException("Document template " + fileName + " doesn't contains body!");
}
}
private FileService getFileService() {
if (fileService == null) {
fileService = ServiceLocator.locateService(FileService.class);
}
return fileService;
}
private Object callGetter(Object obj, String fieldName) {
PropertyDescriptor pd;
try {
pd = new PropertyDescriptor(fieldName, obj.getClass());
return pd.getReadMethod().invoke(obj);
} catch (IntrospectionException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException e) {
throw new TechnicalException(e.getMessage(), e);
}
}
private String objectToStr(Object obj) {
if (obj instanceof Date) {
return new SimpleDateFormat("dd.MM.yyyy").format(obj);
}
return obj.toString();
}
public static List<TemplateGenEntity> newTempEntList(TemplateGenEntity entity) {
List<TemplateGenEntity> list = new ArrayList<>();
list.add(entity);
return list;
}
public static List<TemplateGenEntity> newTempEntList(List<TemplateGenEntity> entities, TemplateGenEntity entity) {
List<TemplateGenEntity> list = new ArrayList<>();
for (TemplateGenEntity ent : entities) {
list.add(ent);
}
list.add(entity);
return list;
}
public class TemplateGenEntity {
private String entityName;
private Object entity;
public TemplateGenEntity(String entityName, Object entity) {
this.entityName = entityName;
this.entity = entity;
}
public String getEntityName() {
return entityName;
}
public void setEntityName(String entityName) {
this.entityName = entityName;
}
public Object getEntity() {
return entity;
}
public void setEntity(Object entity) {
this.entity = entity;
}
}
}

use freemarker for the placeholder replacement and pd4ml for the html convertion, it works well for me.

Related

How to find an attribute using HTMLDocument?

Possibly the terminology is different with HTML than with XML, but here is a HTML document from which attributes are being retrieved. Here the attributes a1, a2, a3 are part of the Body tag.
<html>
<head>
Hello World
</head>
<body a1="ABC" a2="3974" a3="A1B2"> <------These attributes
<H1>Start Here<H1>
<p>This is the body</p>
</body>
</html>
Using the following file to parse the above HTML file.
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.Reader;
import javax.swing.text.AttributeSet;
import javax.swing.text.Element;
import javax.swing.text.ElementIterator;
import javax.swing.text.StyleConstants;
import javax.swing.text.html.HTML;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
import javax.swing.text.html.parser.ParserDelegator;
public class HTMLParserTest
{
public static void main(String args[]) throws Exception {
Reader reader = new FileReader("C:/Downloads/DeleteMe/Example1.html");
BufferedReader br = new BufferedReader(reader );
HTMLEditorKit htmlKit = new HTMLEditorKit();
HTMLDocument htmlDoc = (HTMLDocument) htmlKit.createDefaultDocument();
HTMLEditorKit.Parser parser = new ParserDelegator();
HTMLEditorKit.ParserCallback callback = htmlDoc.getReader(0);
parser.parse(br, callback, true);
// Parse
ElementIterator iterator = new ElementIterator(htmlDoc);
Element element;
while ((element = iterator.next()) != null)
{
System.out.println("Element : " + element);
AttributeSet attributes = element.getAttributes();
Object name = attributes.getAttribute(StyleConstants.NameAttribute);
if ((name instanceof HTML.Tag))
//&& ((name == HTML.Tag.H1) || (name == HTML.Tag.H2) || (name == HTML.Tag.H3)))
{
// Build up content text as it may be within multiple elements
StringBuffer text = new StringBuffer();
int count = element.getElementCount();
for (int i = 0; i < count; i++) {
Element child = element.getElement(i);
AttributeSet childAttributes = child.getAttributes();
System.out.println("Element : " + child);
System.out.println(" Attribute count : " + childAttributes.getAttributeCount());
System.out.println(" a1 exists : " + childAttributes.isDefined("a1"));
int startOffset = child.getStartOffset();
int endOffset = child.getEndOffset();
int length = endOffset - startOffset;
text.append(htmlDoc.getText(startOffset, length));
}
}
}
System.exit(0);
}
}
The output is here.
Element : BranchElement(html) 0,1
Element : BranchElement(body) 0,1
Attribute count : 1
a1 exists : false <-----expected true here.
Element : BranchElement(body) 0,1
Element : BranchElement(p) 0,1
Attribute count : 3
a1 exists : false
Element : BranchElement(p) 0,1
Element : LeafElement(content) 0,1
Attribute count : 1
a1 exists : false
Element : LeafElement(content) 0,1
The expectation is that the "a1 exists" check should have returned true once, but it did not.
Eventually all 3 (a1, a2, a3) will be searched.
Is the above code the proper implementation or is this not feasible with the HTML parser?

Maybe this will help:
import java.io.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
class AttributeHTML
{
public static void main(String[] args)
{
EditorKit kit = new HTMLEditorKit();
Document doc = kit.createDefaultDocument();
// The Document class does not yet handle charset's properly.
doc.putProperty("IgnoreCharsetDirective", Boolean.TRUE);
try
{
// Create a reader on the HTML content.
Reader rd = getReader(args[0]);
// Parse the HTML.
kit.read(rd, doc, 0);
// Iterate through the elements of the HTML document.
ElementIterator it = new ElementIterator(doc);
Element elem = null;
while ( (elem = it.next()) != null )
{
if (elem.getName().equals("body"))
{
AttributeSet as = elem.getAttributes();
Enumeration enum1 = as.getAttributeNames();
while( enum1.hasMoreElements() )
{
Object name = enum1.nextElement();
Object value = as.getAttribute( name );
System.out.println( "\t" + name + " : " + value );
}
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
System.exit(1);
}
// Returns a reader on the HTML data. If 'uri' begins
// with "http:", it's treated as a URL; otherwise,
// it's assumed to be a local filename.
static Reader getReader(String uri)
throws IOException
{
// Retrieve from Internet.
if (uri.startsWith("http:"))
{
URLConnection conn = new URL(uri).openConnection();
return new InputStreamReader(conn.getInputStream());
}
// Retrieve from file.
else
{
return new FileReader(uri);
}
}
}
Test using:
java AttributeHTML yourFile.html

I am not aware about HtmlKitbut u can achieve similar result using regex
public static void main(String[] args) throws UnirestException {
String html = "<html>\r\n" +
" <head>\r\n" +
" Hello World\r\n" +
" </head>\r\n" +
" <body a1=\"ABC\" a2=\"3974\" a3=\"A1B2\">\r\n" +
" <H1>Start Here<H1>\r\n" +
" <p>This is the body</p>\r\n" +
" </body>\r\n" +
"</html>";
Pattern regexBodyPattern = Pattern.compile("<body[^>]*>", Pattern.MULTILINE);
Matcher matcher = regexBodyPattern.matcher(html);
while(matcher.find()) {
String bodyTag = matcher.group();
Pattern regexBodyAttrPattern = Pattern.compile("(\\S*)=(\\\"\\w*\\\")", Pattern.MULTILINE);
Matcher attrMatcher = regexBodyAttrPattern.matcher(bodyTag);
while(attrMatcher.find()) {
System.out.println("Key :: "+attrMatcher.group(1)+" , Value "+attrMatcher.group(2));
}
}
}
output
Key :: a1 , Value "ABC"
Key :: a2 , Value "3974"
Key :: a3 , Value "A1B2"

To retrieve the attributes, you can provide your own ParserCallback
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.html.HTML.Tag;
import javax.swing.text.html.HTMLEditorKit.ParserCallback;
import javax.swing.text.html.parser.ParserDelegator;
public class HTMLParserTest2
{
public static void main(String args[]) throws Exception {
Reader reader = new FileReader("d:/temp/Example.html");
BufferedReader br = new BufferedReader(reader);
System.out.println(HTMLParserTest2.extractTagsAttributes(br));
// output : [title-_implied_=true, body-a1=ABC, body-a2=3974, body-a3=A1B2]
System.exit(0);
}
public static List<String> extractTagsAttributes(Reader r) throws IOException {
final ArrayList<String> list = new ArrayList<String>();
ParserDelegator parserDelegator = new ParserDelegator();
ParserCallback parserCallback = new ParserCallback() {
#Override
public void handleText(final char[] data, final int pos) { }
#Override
public void handleStartTag(Tag tag, MutableAttributeSet attribute, int pos) {
Enumeration<?> e=attribute.getAttributeNames();
while(e.hasMoreElements()) {
Object name=e.nextElement();
Object value=attribute.getAttribute(name);
list.add(tag.toString() + "-" + name + "=" +value);
}
}
#Override
public void handleEndTag(Tag t, final int pos) { }
#Override
public void handleSimpleTag(Tag t, MutableAttributeSet a, final int pos) { }
#Override
public void handleComment(final char[] data, final int pos) { }
#Override
public void handleError(final java.lang.String errMsg, final int pos) { }
};
parserDelegator.parse(r, parserCallback, true);
return list;
}
}

How can i find APIs for a weather forcast websites?

I making a java application that give the user notification with the weather conditions.
i used the yahoo weather API provided by yahoo like that link :
http://weather.yahooapis.com/forecastrss?w=2502265
and all i have to do is to change the eight numbered code that is in the URL in order to change the city.
that's working perfect, but there are two problems facing me now:
the first one, i want to implement a lot of weather forecast sources in my application not just the yahoo weather and i can't find a similar service in any other weather forecast websites.
the second one, i want to obtain the codes of all the cities in yahoo weather as for sure i won't ask the user to enter his city code, but to enter his city name and i'll match it with the code.
and here is the code that works with me in java:
the code to return the XML file:
package search;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.net.URL;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
public class Process {
public static void main(String[] args) throws IOException {
Display disp = new Display();
Document doc = generateXML("1940345");
disp.getConditions(doc);
}
public static Document generateXML(String code) throws IOException {
String url = null;
String XmlData = null;
// creating the URL
url = "http://weather.yahooapis.com/forecastrss?w=" + code;
URL xmlUrl = new URL(url);
InputStream in = xmlUrl.openStream();
// parsing the XmlUrl
Document doc = parse(in);
return doc;
}
public static Document parse(InputStream is) {
Document doc = null;
DocumentBuilderFactory domFactory;
DocumentBuilder builder;
try {
domFactory = DocumentBuilderFactory.newInstance();
domFactory.setValidating(false);
domFactory.setNamespaceAware(false);
builder = domFactory.newDocumentBuilder();
doc = builder.parse(is);
} catch (Exception ex) {
System.err.println("unable to load XML: " + ex);
}
return doc;
}
}
the code to display the temperature and humidity in that city :
package search;
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class Display {
static void getConditions(Document doc) {
String city = null;
String unit = null;
try {
doc.getDocumentElement().normalize();
NodeList nList = doc.getElementsByTagName("rss");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
NodeList nl = eElement
.getElementsByTagName("yweather:location");
for (int tempr = 0; tempr < nl.getLength(); tempr++) {
Node n = nl.item(tempr);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element e = (Element) n;
city = e.getAttribute("city");
System.out.println("The City Is : " + city);
}
}
NodeList nl2 = eElement
.getElementsByTagName("yweather:units");
for (int tempr = 0; tempr < nl2.getLength(); tempr++) {
Node n2 = nl2.item(tempr);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element e2 = (Element) n2;
unit = e2.getAttribute("temperature");
}
}
NodeList nl3 = eElement
.getElementsByTagName("yweather:condition");
for (int tempr = 0; tempr < nl3.getLength(); tempr++) {
Node n3 = nl3.item(tempr);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element e3 = (Element) n3;
System.out.println("The Temperature In " + city
+ " Is : " + e3.getAttribute("temp") + " "
+ unit);
}
}
NodeList nl4 = eElement
.getElementsByTagName("yweather:atmosphere");
for (int tempr = 0; tempr < nl4.getLength(); tempr++) {
Node n4 = nl4.item(tempr);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element e4 = (Element) n4;
System.out.println("The Humidity In " + city
+ " Is : " + e4.getAttribute("humidity"));
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

You can use Metwit weather api simply passing latitude and longitude.
If you can implement them client-side: 200 request/day (ip based throttling) no authentication required. Worldwide coverage, JSON and REST compliant. You can register for extra API calls for free and if you still need it to call them server side the basic plan is pretty cheap.
Full disclosure: I own this API.

Take a look on this discussion. It seems relevant:
https://stackoverflow.com/questions/4876800/is-there-an-international-weather-forecast-api-that-is-not-limited-for-non-comme
Additionally type "weather forecast api" in google. There are tons of references to APIs that support several weather services.

Here's a list of Weather APIs that are available via the Temboo Java SDK:
https://temboo.com/library/keyword/weather/

You can use YQL (yahoo query language) to find the WOEID by city name like
var lclqry = escape('select * from geo.places where text="OKLAHOMA CITY"')
var lclurl = "http://query.yahooapis.com/v1/public/yql?q=" + lclqry + "&format=json&callback=?";

I know this is an old question, but i found it and as Sai suggested i have written code in java that send YQL query and retrieve WOEID number. Than it uses it to get weather from yahoo-weather-java-api. It needs gson dependecy which you can get by adding dependency to maven. I hope this will help someone.
EDIT
If there is more than one WOEID number for given town name, than getWeather returns weather for town with first WOEID returned.
CODE
Weather.java:
import com.github.fedy2.weather.YahooWeatherService;
import com.github.fedy2.weather.data.Channel;
import com.github.fedy2.weather.data.unit.DegreeUnit;
import com.google.gson.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLEncoder;
import javax.xml.bind.JAXBException;
/**
*
* #author robert
*/
public class Weather
{
public Channel getWeather(String townName) throws CantFindWeatherException
{
try
{
String baseUrl = "http://query.yahooapis.com/v1/public/yql?q=";
String query =
"select woeid from geo.places where text=\"" +
townName + "\"";
String fullUrlStr = baseUrl + URLEncoder.encode(query, "UTF-8") +
"&format=json";
URL fullUrl = new URL(fullUrlStr);
ResultObject resultObject = null;
ResultArray resultArray = null;
try (InputStream is = fullUrl.openStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr))
{
String result = "";
String read;
while ((read = br.readLine()) != null)
{
result += read;
}
Gson gson = new Gson();
try
{
resultObject = gson.fromJson(result, ResultObject.class);
}
catch (com.google.gson.JsonSyntaxException ex)
{
resultArray = gson.fromJson(result, ResultArray.class);
}
}
Integer woeid = null;
if (resultObject != null)
{
if (resultObject.query.results != null)
{
woeid = resultObject.query.results.place.woeid;
}
}
else if (resultArray != null)
{
woeid = resultArray.query.results.place[0].woeid;
}
if (woeid != null)
{
YahooWeatherService service = new YahooWeatherService();
Channel channel = service.getForecast(woeid.toString(),
DegreeUnit.CELSIUS);
return channel;
}
else
{
throw new CantFindWeatherException();
}
}
catch (IOException | JsonSyntaxException | JAXBException ex)
{
throw new CantFindWeatherException(ex);
}
}
private static class ResultObject
{
public QueryObject query;
}
private static class ResultArray
{
public QueryArray query;
}
private static class QueryObject
{
public int count;
public String created;
public String lang;
public ResultsObject results;
}
private static class QueryArray
{
public int count;
public String created;
public String lang;
public ResultsArray results;
}
private static class ResultsObject
{
public Place place;
}
private static class ResultsArray
{
public Place[] place;
}
private static class Place
{
public int woeid;
}
}
CantFindWeatherException.java:
/**
*
* #author robert
*/
public class CantFindWeatherException extends Exception
{
public CantFindWeatherException()
{
}
public CantFindWeatherException(String message)
{
super(message);
}
public CantFindWeatherException(String message, Throwable cause)
{
super(message, cause);
}
public CantFindWeatherException(Throwable cause)
{
super(cause);
}
}

As for the first question, I've build a website using forecast.io. It's pretty good. Good API and 1000 free calls/day. It uses latitute/longitude to find the weather of a place.
As for the second question, I would resolve what the user puts in with the Google Geocoding Api. So when they search for "New York", you check if you already have the relevant coordinates in your database, otherwise, you do an API call to Google Geocoding.

How to get a specific event/attribute content from an xml string via stAX or SAX

I have a xml POST response which I receive as a string. I need the content of the particular "pnr" (see in xml) to pass it on to another GET request.
I am trying sax and stAX to achieve this but failing miserably.
I used getElementsByTagName and also getAttribute, but no go...
Here's my code and later the xml string that I receive.
Any kind of help will be a gift
package rest;
import javax.xml.parsers.*;
import org.xml.sax.InputSource;
import org.w3c.dom.*;
import java.io.*;
public class ParseXMLString {
public static void main(String arg[]) {
String outputString = RESTClient.postConfirm(); // this is the xml string response I am getting
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(outputString));
Document doc = db.parse(is);
String Parentnode = doc.getDocumentElement().getAttribute("pnr");
// Element element = (Element) Parentnode.;
// NodeList name = element.getElementsByTagName("pnr");
// Element line = (Element) name.item(0);
//String IDList = getCharacterDataFromElement(line);
System.out.println(Parentnode);
}
catch (Exception e) {
e.printStackTrace();
}
}
public static String getCharacterDataFromElement(Element e) {
Node child = e.getFirstChild();
if (child instanceof CharacterData) {
CharacterData cd = (CharacterData) child;
return cd.getData();
}
return "?";
}
}
And here is the the XML String I have received:
<?xml version="1.0" encoding="UTF-8"?><Ticket><bookedSeats>3</bookedSeats><bpAddress>Anand Rao Circle</bpAddress><bpLandMark>ganesha temple</bpLandMark><bpLocation> Ghousia College</bpLocation><bpPhoneNo>98798679769</bpPhoneNo><bpTime>1200</bpTime><busServiceName>efdf</busServiceName><busType>Volvo A/C Semi Sleeper (2+2)</busType><commission>66.19</commission><dateOfJourney>2012-10-05</dateOfJourney><destination>Chennai</destination><fare>600.0</fare><issueTime>2012-10-04T15:46:45.073+05:30</issueTime><noOfSeats>1</noOfSeats><passengerMobile>1234567890</passengerMobile><passengerName>Test</passengerName><pnr>RATPKES44974756</pnr><seatDetails><seatDetail><commission>66.19</commission><fare>600.0</fare><gender>MALE</gender><passengerAge>0</passengerAge><passengerMobile>1234567890</passengerMobile><passengerName>Test</passengerName><prime>false</prime><seatName>3</seatName></seatDetail></seatDetails><source>Bangalore</source><status>BOOKED</status><travelsName>Rajratan Travels</travelsName></Ticket>

Instead of SAX or StAX you could do the following with the javax.xml.xpath APIs in the JDK/JRE since Java SE 5:
Demo
import java.io.StringReader;
import javax.xml.xpath.*;
import org.xml.sax.InputSource;
public class Demo {
public static void main(String[] args) throws Exception {
String xml = "<?xml version='1.0' encoding='UTF-8'?><Ticket><bookedSeats>3</bookedSeats><bpAddress>Anand Rao Circle</bpAddress><bpLandMark>ganesha temple</bpLandMark><bpLocation> Ghousia College</bpLocation><bpPhoneNo>98798679769</bpPhoneNo><bpTime>1200</bpTime><busServiceName>efdf</busServiceName><busType>Volvo A/C Semi Sleeper (2+2)</busType><commission>66.19</commission><dateOfJourney>2012-10-05</dateOfJourney><destination>Chennai</destination><fare>600.0</fare><issueTime>2012-10-04T15:46:45.073+05:30</issueTime><noOfSeats>1</noOfSeats><passengerMobile>1234567890</passengerMobile><passengerName>Test</passengerName><pnr>RATPKES44974756</pnr><seatDetails><seatDetail><commission>66.19</commission><fare>600.0</fare><gender>MALE</gender><passengerAge>0</passengerAge><passengerMobile>1234567890</passengerMobile><passengerName>Test</passengerName><prime>false</prime><seatName>3</seatName></seatDetail></seatDetails><source>Bangalore</source><status>BOOKED</status><travelsName>Rajratan Travels</travelsName></Ticket>";
XPathFactory xpf = XPathFactory.newInstance();
XPath xpath = xpf.newXPath();
InputSource inputSource = new InputSource(new StringReader(xml));
String pnr = (String) xpath.evaluate("/Ticket/pnr", inputSource, XPathConstants.STRING);
System.out.println(pnr);
}
}
Output
RATPKES44974756

this bit of code will get you the pnr :
NodeList nodeLst = doc.getElementsByTagName("Ticket");
Node ticket = nodeLst.item(0);
NodeList attr = ticket.getChildNodes();
for (int i = 0; i < attr.getLength(); i++){
if (attr.item(i).getNodeName().equals("pnr"))
System.out.println(attr.item(i).getTextContent());
}

If I were to solve this problem, I'd probably use XPath. But since you specifically asked for StAX, here's an example parser (note that this is just skeleton code to get you started).
import java.io.StringReader;
import java.util.Iterator;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.Characters;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;
public class ParseXMLStringStAX {
private static final String PNR = "pnr";
private String characters;
public String parse(String xmlString) throws XMLStreamException, Exception {
XMLEventReader reader = null;
try {
if (xmlString == null || xmlString.isEmpty()) {
throw new IllegalArgumentException("Illegal initializiation (xmlString is null or empty)");
}
StringReader stringReader = new StringReader(xmlString);
XMLInputFactory inputFact = XMLInputFactory.newInstance();
XMLStreamReader streamReader = inputFact.createXMLStreamReader(stringReader);
reader = inputFact.createXMLEventReader(streamReader);
while (reader.hasNext()) {
XMLEvent event = reader.nextEvent();
if (event.isCharacters()) {
characters(event);
}
if (event.isStartElement()) {
startElement(event);
// handle attributes
Iterator<Attribute> attributes = event.asStartElement().getAttributes();
while(attributes.hasNext()) {
attribute(attributes.next());
}
}
if (event.isEndElement()) {
// found what we want?
if (endElement(event)) {
endDocument(null);
break;
}
}
if (event.isStartDocument()) {
startDocument(event);
}
if (event.isEndDocument()) {
endDocument(event);
}
}
} catch (XMLStreamException ex) {
throw ex;
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (XMLStreamException ex) {
}
}
return characters;
}
private void attribute(XMLEvent event) throws Exception {
}
private void characters(XMLEvent event) throws Exception {
Characters asCharacters = event.asCharacters();
if (asCharacters.isWhiteSpace())
return;
if (characters == null) {
characters = asCharacters.getData();
} else {
characters += asCharacters.getData();
}
}
private void startElement(XMLEvent event) throws Exception {
StartElement startElement = event.asStartElement();
String name = startElement.getName().getLocalPart();
characters = null;
}
private boolean endElement(XMLEvent event) throws Exception {
EndElement endElement = event.asEndElement();
String name = endElement.getName().getLocalPart();
if (PNR.equals(name)) {
return true;
}
return false;
}
private void startDocument(XMLEvent event) {
System.out.println("Parsing started");
}
private void endDocument(XMLEvent event) {
System.out.println("Parsing ended");
}
public static void main(String[] argv) throws XMLStreamException, Exception {
String xml = "";
xml += "<Ticket>";
xml += " <bookedSeats>3</bookedSeats>";
xml += " <bpAddress>Anand Rao Circle</bpAddress>";
xml += " <bpLandMark>ganesha temple</bpLandMark>";
xml += " <bpLocation> Ghousia College</bpLocation>";
xml += " <bpPhoneNo>98798679769</bpPhoneNo>";
xml += " <bpTime>1200</bpTime>";
xml += " <busServiceName>efdf</busServiceName>";
xml += " <busType>Volvo A/C Semi Sleeper (2+2)</busType>";
xml += " <commission>66.19</commission>";
xml += " <dateOfJourney>2012-10-05</dateOfJourney>";
xml += " <destination>Chennai</destination>";
xml += " <fare>600.0</fare>";
xml += " <issueTime>2012-10-04T15:46:45.073+05:30</issueTime>";
xml += " <noOfSeats>1</noOfSeats>";
xml += " <passengerMobile>1234567890</passengerMobile>";
xml += " <passengerName>Test</passengerName>";
xml += " <pnr>RATPKES44974756</pnr>";
xml += " <seatDetails>";
xml += " <seatDetail>";
xml += " <commission>66.19</commission>";
xml += " <fare>600.0</fare>";
xml += " <gender>MALE</gender>";
xml += " <passengerAge>0</passengerAge>";
xml += " <passengerMobile>1234567890</passengerMobile>";
xml += " <passengerName>Test</passengerName>";
xml += " <prime>false</prime>";
xml += " <seatName>3</seatName>";
xml += " </seatDetail>";
xml += " </seatDetails>";
xml += " <source>Bangalore</source>";
xml += " <status>BOOKED</status>";
xml += " <travelsName>Rajratan Travels</travelsName>";
xml += "</Ticket>";
ParseXMLStringStAX parser = new ParseXMLStringStAX();
String pnr = parser.parse(xml);
System.out.println("--> Result: " + String.valueOf(pnr));
}
}

XML Document traverser in java

every one knows we can traverse entire xml document using DocumentTraversal's NodeIterator.
my application require some extra work so i decided to write my own XML traverser with the support of java Stack<>.
here is my code (i am not good at coding so the code and logic might look messy).
public class test
{
private static Stack<Node> gStack = new Stack<Node>();
public static void main(String[] args) throws XPathExpressionException
{
String str =
"<section>"
+ "<paragraph>This example combines regular wysiwyg editing of a document with very controlled editing of semantic rich content. The main content can be"
+ "edited like you would in a normal word processor. Though the difference is that the content remains schema valid XML because Xopus will not allow you to perform actions"
+ "on the document that would render it invalid.</paragraph>"
+ "<paragraph>The table is an example of controlled style. The style of the table is controlled by three attributes:</paragraph>"
+ "<unorderedlist>"
+ "<item><paragraph><emphasis>alternaterowcolor</emphasis>, do all rows have the same color, or should the background color alternate?</paragraph></item>"
+ "<item><paragraph><emphasis>border</emphasis>, a limited choice of border styles.</paragraph></item>"
+ "<item><paragraph><emphasis>color</emphasis>, a limited choice of colors.</paragraph></item>"
+ "</unorderedlist>"
+ "<paragraph>You have quite some freedom to style the table, but you can't break the predefined style.</paragraph>"
+ "</section>";
Document domDoc = null;
try
{
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
ByteArrayInputStream bis = new ByteArrayInputStream(str.getBytes());
domDoc = docBuilder.parse(bis);
}
catch (Exception e)
{
e.printStackTrace();
}
Element root = null;
NodeList list = domDoc.getChildNodes();
for (int i = 0; i < list.getLength(); i++)
{
if (list.item(i) instanceof Element)
{
root = (Element) list.item(i);
break;
}
}
NodeList nlist = root.getChildNodes();
System.out.println("root = " + root.getNodeName() + " child count = " + nlist.getLength());
domTraversor(root);
}
private static void domTraversor(Node node)
{
if (node.getNodeName().equals("#text"))
{
System.out.println("textElem = " + node.getTextContent());
if (node.getNextSibling() != null)
{
gStack.push(node.getNextSibling());
domTraversor(node.getNextSibling());
}
else
{
if (node.getParentNode().getNextSibling() != null)
domTraversor(node.getParentNode().getNextSibling());
}
}
else
{
if (node.getChildNodes().getLength() > 1)
{
gStack.push(node);
Node n = node.getFirstChild();
if (n.getNodeName().equals("#text"))
{
System.out.println("textElem = " + n.getTextContent());
if (n.getNextSibling() != null)
{
gStack.push(n.getNextSibling());
domTraversor(n.getNextSibling());
}
}
else
{
gStack.push(n);
domTraversor(n);
}
}
else if (node.getChildNodes().getLength() == 1)
{
Node fnode = node.getFirstChild();
if (fnode.getChildNodes().getLength() > 1)
{
gStack.push(fnode);
domTraversor(fnode);
}
else
{
if (!fnode.getNodeName().equals("#text"))
{
gStack.push(fnode);
domTraversor(fnode);
}
else
{
System.out.println("textElem = " + fnode.getTextContent());
if (fnode.getNodeName().equals("#text"))
{
if (node.getNextSibling() != null)
{
gStack.push(node.getNextSibling());
domTraversor(node.getNextSibling());
}
else
{
if (!gStack.empty())
{
Node sibPn = gStack.pop();
if (sibPn.getNextSibling() == null)
{
sibPn = gStack.pop();
}
domTraversor(sibPn.getNextSibling());
}
}
}
else
{
if (fnode.getNextSibling() != null)
{
domTraversor(fnode.getNextSibling());
}
else
{
if (!gStack.empty())
{
Node sibPn = gStack.pop().getNextSibling();
domTraversor(sibPn);
}
}
}
}
}
}
}
}
}
and it is working fine with some xml document, but not with the document which has tag like.
<unorderedlist>
<item>
<paragraph>
<emphasis>alternaterowcolor</emphasis>
, do all rows have the same color, or should the background
color
alternate?
</paragraph>
</item>
<item>
<paragraph>
<emphasis>border</emphasis>
, a limited choice of border styles.
</paragraph>
</item>
<item>
<paragraph>
<emphasis>color</emphasis>
, a limited choice of colors.
</paragraph>
</item>
</unorderedlist>
here is the scenario if any element has more than three nested children my code get stopped and not going further.
is there any one has a better implementation, please suggest.

try this way
Element e;
NodeList n;
Document doc=StudyParser.XMLfromString(xmlString);
String starttag=doc.getFirstChild().getNodeName();
Log.e("start",starttag );
n=doc.getElementsByTagName(starttag);
for(int i=0;i<n.getLength();i++){
e=(Element)n.item(i);
NodeList np = e.getElementsByTagName("item");
for(int j=0;j<np.getLength();j++){
e=(Element)n.item(i);
try{
String para=StudyParser.getValue(e, "paragraph");
Log.e("paravalue",para);
String emp=StudyParser.getValue(e, "emphasis");
Log.e("empval",emp);
}catch(Exception e){
e.printStackTrace();
}
}
}
StudyParser Class
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class StudyParser {
public StudyParser() {
}
public final static Document XMLfromString(String xml){
Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xml));
doc = db.parse(is);
} catch (ParserConfigurationException e) {
System.out.println("XML parse error: " + e.getMessage());
return null;
} catch (SAXException e) {
System.out.println("Wrong XML file structure: " + e.getMessage());
return null;
} catch (IOException e) {
System.out.println("I/O exeption: " + e.getMessage());
return null;
}
return doc;
}
public static String getXMLstring(String xml){
String line = null;
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(xml);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
line = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
line = "<results status=\"error\"><msg>Can't connect to server</msg></results>";
} catch (MalformedURLException e) {
line = "<results status=\"error\"><msg>Can't connect to server</msg></results>";
} catch (IOException e) {
line = "<results status=\"error\"><msg>Can't connect to server</msg></results>";
}
return line;
}
public static String getXML(InputStream is)throws IOException {
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayOutputStream buf = new ByteArrayOutputStream();
int result = bis.read();
while(result != -1) {
byte b = (byte)result;
buf.write(b);
result = bis.read();
}
return buf.toString();
}
public final static String getElementValue( Node elem ) {
Node kid;
if( elem != null){
if (elem.hasChildNodes()){
for( kid = elem.getFirstChild(); kid != null; kid = kid.getNextSibling() ){
if( kid.getNodeType() == Node.TEXT_NODE ){
return kid.getNodeValue();
}
}
}
}
return "";
}
public static int numResults(Document doc){
Node results = doc.getDocumentElement();
int res = -1;
try{
res = Integer.valueOf(results.getAttributes().getNamedItem("Categories").getNodeValue());
}catch(Exception e ){
res = -1;
}
return res;
}
public static String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return StudyParser.getElementValue(n.item(0));
}
}
Just Normal demo for dynamic xml i have assumed the same xml and but without using getElementByTagName there are many properties you can check accodringlly see
doc = StudyParser.XMLfromString(xml);
String starttag=doc.getFirstChild().getNodeName();
Log.e("start",starttag );
n=doc.getElementsByTagName(starttag);
for(int i=0;i<n.getLength();i++){
e=(Element)n.item(i);
try{
Log.e("1234",""+ e.getTextContent());
}catch(Exception e){
e.printStackTrace();
}
}

java find value of an xml attribute

this is my xml :
<-tobject.subject tobject.subject.refnum="01016000" />
<-tobject.subject tobject.subject.refnum="10004000" />
I want to extract 01016000 and 10004000 from it .
I used this code:
NodeList nodeLst4 = doc.getElementsByTagName("tobject.subject");
if (nodeLst4 != null) {
int numberofCOdes = nodeLst4.getLength();
aSubjectCodes = new String[numberofCOdes];
for (int i = 0; i < numberofCOdes; i++) {
XPath xpath = XPathFactory.newInstance().newXPath();
aSubjectCodes[i] = xpath.evaluate("//tobject.subject/#tobject.subject.refnum", doc);
the problem is that when i loop through it the evaluate method just return first number and do not give me the second value.
and i am not sure if using xpath.evaluate is good idea or not.
Thanks

there is no need to use the doc.getElementsByTagName.
You are mixing plain DOM with XPath.
Your xpath is correct:
package net.davymeers;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collection;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class XpathTest {
private static String XMLSTRING = "<data>"
+ "<tobject.subject tobject.subject.refnum=\"01016000\" />\r\n"
+ "\r\n"
+ "<tobject.subject tobject.subject.refnum=\"10004000\" />"
+ "</data>";
/**
* #param args
*/
public static void main(final String[] args) {
final Document doc = createDocument();
final XPath xpath = createXpath();
final NodeList nodes = findElements(
"//tobject.subject/#tobject.subject.refnum", doc, xpath);
final Collection<String> results = convertToCollection(nodes);
for (final String result : results) {
System.out.println(result);
}
}
private static Document createDocument() {
Document doc = null;
try {
final DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
.newInstance();
documentBuilderFactory.setNamespaceAware(true); // never forget
// this!
final DocumentBuilder builder = documentBuilderFactory
.newDocumentBuilder();
doc = builder.parse(new ByteArrayInputStream(XMLSTRING
.getBytes("ISO-8859-1")));
} catch (final UnsupportedEncodingException exception) {
// TODO handle exception
} catch (final SAXException exception) {
// TODO handle exception
} catch (final IOException exception) {
// TODO handle exception
} catch (final ParserConfigurationException exception) {
// TODO handle exception
}
return doc;
}
private static XPath createXpath() {
final XPathFactory xpathFactory = XPathFactory.newInstance();
final XPath xpath = xpathFactory.newXPath();
return xpath;
}
private static NodeList findElements(final String xpathExpression,
final Document doc, final XPath xpath) {
NodeList nodes = null;
if (doc != null) {
try {
final XPathExpression expr = xpath.compile(xpathExpression);
final Object result = expr
.evaluate(doc, XPathConstants.NODESET);
nodes = (NodeList) result;
} catch (final XPathExpressionException exception) {
// TODO handle exception
}
}
return nodes;
}
private static Collection<String> convertToCollection(final NodeList nodes) {
final Collection<String> result = new ArrayList<String>();
if (nodes != null) {
for (int i = 0; i < nodes.getLength(); i++) {
result.add(nodes.item(i).getNodeValue());
}
}
return result;
}
}

Here's a useful class I found a while back for XMLFiles. Takes a lot of the work off of your shoulders.
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* XMLFile.java
*
* XML file object that represents an xml file and its properties. Used to
* simplify the process of reading from and writing to XML files.
*
* Derived from unknown source. Implemented on 12/03/09. Permission given to
* implement and modify code.
*/
public class XMLFile {
private String name;
private String content;
private Map<String, String> nameAttributes = new HashMap<String, String>();
private Map<String, List<XMLFile>> nameChildren = new HashMap<String, List<XMLFile>>();
private static Element rootElement(String filename, String rootName) {
FileInputStream fileInputStream = null;
try {
fileInputStream = new FileInputStream(filename);
DocumentBuilderFactory builderFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document document = builder.parse(fileInputStream);
Element rootElement = document.getDocumentElement();
if (!rootElement.getNodeName().equals(rootName))
throw new RuntimeException("Could not find root node: "
+ rootName);
return rootElement;
} catch (Exception exception) {
throw new RuntimeException(exception);
} finally {
if (fileInputStream != null) {
try {
fileInputStream.close();
} catch (Exception exception) {
throw new RuntimeException(exception);
}
}
}
}
/**
* #param (String) Filepath of XML File (String) Root of XML File
**/
public XMLFile(String filename, String rootName) {
this(rootElement(filename, rootName));
}
/**
* #param (Element) XML File Element
**/
private XMLFile(Element element) {
this.name = element.getNodeName();
this.content = element.getTextContent();
NamedNodeMap namedNodeMap = element.getAttributes();
int n = namedNodeMap.getLength();
for (int i = 0; i < n; i++) {
Node node = namedNodeMap.item(i);
String name = node.getNodeName();
addAttribute(name, node.getNodeValue());
}
NodeList nodes = element.getChildNodes();
n = nodes.getLength();
for (int i = 0; i < n; i++) {
Node node = nodes.item(i);
int type = node.getNodeType();
if (type == Node.ELEMENT_NODE)
addChild(node.getNodeName(), new XMLFile((Element) node));
}
}
/**
* Adds attribute to ???
*
* #param (String) Attribute Name (String) Attribute Value
**/
private void addAttribute(String name, String value) {
nameAttributes.put(name, value);
}
/**
* Adds child directory to ???
*
* #param (String) Name of New Child Directory (XMLFile) XML Documentation
* of Child
**/
private void addChild(String name, XMLFile child) {
List<XMLFile> children = nameChildren.get(name);
if (children == null) {
children = new ArrayList<XMLFile>();
nameChildren.put(name, children);
}
children.add(child);
}
public String name() {
return name;
}
public String content() {
return content;
}
/**
*
**/
public XMLFile child(String name) {
List<XMLFile> children = children(name);
if (children.size() != 1)
throw new RuntimeException("Could not find individual child node: "
+ name);
return children.get(0);
}
/**
*
**/
public List<XMLFile> children(String name) {
List<XMLFile> children = nameChildren.get(name);
return children == null ? new ArrayList<XMLFile>() : children;
}
/**
* Gets the value of a specific field and converts it to a String object
*
* #param (String) Name of Field
**/
public String string(String name) {
String value = nameAttributes.get(name);
if (value == null)
throw new RuntimeException("Could not find attribute: " + name
+ ", in node: " + this.name);
return value;
}
/**
* Gets the value of a specific field and converts it to an int
*
* #param (String) Name of Field
**/
public int integer(String name) {
return Integer.parseInt(string(name));
}
/**
* Gets the value of a specific field and converts it to an
* ArrayList<String>
*
* #param (String) Name of Field
**/
public ArrayList<String> arrayListString(String name) {
String left = new String();
int finished = 0;
ArrayList<String> list = new ArrayList<String>();
try {
left = nameAttributes.get(name);
} catch (Exception e) {
System.err.println("Exception: " + e.getMessage());
}
while (finished == 0) {
if (left.indexOf(", ") > -1) {
list.add(left.substring(0, left.indexOf(", ")));
left = left.substring(left.indexOf(", ") + 2);
} else {
list.add(left);
finished = 1;
}
}
return list;
}
}

Would this work for you? I am parsing RSS XML from here:
http://www.kraftfoods.com/rss/dinnerRecipes.aspx
Look at Media and URL towards the bottom:
package recipeSearchAndFinder.xml;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class DomFeedParser extends BaseFeedParser {
public DomFeedParser(String feedUrl) {
super(feedUrl);
}
public List<Message> parse() {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
List<Message> messages = new ArrayList<Message>();
try {
DocumentBuilder builder = factory.newDocumentBuilder();
Document dom = builder.parse(this.getInputStream());
Element root = dom.getDocumentElement();
NodeList items = root.getElementsByTagName(ITEM);
for (int i = 0; i < items.getLength(); i++) {
Message message = new Message();
Node item = items.item(i);
NodeList properties = item.getChildNodes();
for (int j = 0; j < properties.getLength(); j++) {
Node property = properties.item(j);
String name = property.getNodeName();
if (name.equalsIgnoreCase(TITLE)) {
message.setTitle(property.getFirstChild()
.getNodeValue());
} else if (name.equalsIgnoreCase(LINK)) {
message.setLink(property.getFirstChild().getNodeValue());
} else if (name.equalsIgnoreCase(DESCRIPTION)) {
StringBuilder text = new StringBuilder();
NodeList chars = property.getChildNodes();
for (int k = 0; k < chars.getLength(); k++) {
text.append(chars.item(k).getNodeValue());
}
message.setDescription(text.toString());
} else if (name.equalsIgnoreCase(PUB_DATE)) {
message.setDate(property.getFirstChild().getNodeValue());
} else if (name.equalsIgnoreCase(MEDIA)) {
NamedNodeMap nMap = property.getAttributes();
String mediaurl = nMap.getNamedItem("url")
.getNodeValue();
message.setMedia(mediaurl);
}
}
messages.add(message);
}
} catch (Exception e) {
throw new RuntimeException(e);
}
return messages;
}
}

We Keep Coding

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Converting html files with *ngFor to pdf in Java - java

use freemarker for the placeholder replacement and pd4ml for the html convertion, it works well for me.

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