I'm trying to make a servlet on Jetty that overrides a file extension but that still needs to read the file being accessed.
I've been trying with resources but I could achieve nothing yet. I've tryed this code so far and, as you'll see, the resources are there but I somehow can't access them:
package valarionch.lab0.webapp.todo;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
#SuppressWarnings("serial")
#WebServlet(urlPatterns = { "*.ToDo" })
public class ToDoHandler extends HttpServlet {
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html");
String s = req.getParameter("s");
boolean small = (s != null && s.equals("1"));
PrintWriter out = resp.getWriter();
if (!small) {
out.println("<html><head><title>ToDo list</title></head>"
+ "<body>");
}
for (String res : getServletContext().getResourcePaths("/")) {
System.out.println("Resource: " + res);
System.out.println("ResourceURL: " + getServletContext().getResource(res));
System.out.println("ResourceStream: " + getServletContext().getResourceAsStream(res));
}
InputStream input = getServletContext().getResourceAsStream(req.getRequestURI());
System.out.println(input);
ToDoFormatter.parse(input, out, req.getParameter("q"));
if (!small) {
out.println("</body></html>");
}
}
#Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
}
this code prints this:
Resource: /META-INF/
ResourceURL: null
ResourceStream: null
Resource: /WEB-INF/
ResourceURL: null
ResourceStream: null
Resource: /index.html
ResourceURL: null
ResourceStream: null
Resource: /ToDoList.ToDo
ResourceURL: null
ResourceStream: null
null
I tryed with the next code too but also didn't worked:
getClass().getClassLoader().getResource(".").toString()+"../.."+req.getRequestURI()
so getClass().getClassLoader().getResource(".").toString() goes to WEB-INF/classess and +"../.."+req.getRequestURI() picks the actual file.
Am I missing something about how resources work? Is there another way to read the file?
You can use getServletContext().getRealPath() for such task. Let's imagine that you have the file myText.txt in the webapps folder:
#SuppressWarnings("serial")
#WebServlet(urlPatterns = { "*.ToDo" })
public class UseGetRealPath extends HttpServlet {
public void doGet( HttpServletRequest req, HttpServletResponse res )
throws ServletException, IOException {
String todoFile = getServletContext().getRealPath("/myText.txt");
FileReader fr = new FileReader( todoFile );
for( int c = fr.read(); c != -1; c = fr.read() ) {
System.out.print( (char) c );
}
fr.close();
res.getWriter().println( "check the console!" );
}
}
The code will open the file and dump its content in the console.
Related
im trying to import my own packages to a servlet im making, using tomcat.
The two java files im working with are the servlet (movieServlet.java), and another class im trying to import from a package (Movie.java)
The hierarchy of folders is:
classes
|
+--movieServlet.java
|
+--movie
|
+--Movie.java
movieServlet.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.WebServlet;
import movie.Movie;
#WebServlet(urlPatterns = {"/movieServlet"})
public class movieServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
Movie Movie = new Movie();
request.setAttribute("movies", Movie.getAllMovies());
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/WEB-INF/jsps/movies.jsp");
dispatcher.forward(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/WEB-INF/jsps/movieDetails.jsp");
dispatcher.forward(request,response);
}
}
and this is the top of Movie.java (its a long file)
package movie;
import java.util.*;
import java.util.List;
import javax.sql.*;
import java.sql.*;
import javax.naming.InitialContext;
public class Movie implements java.io.Serializable
{
private static DataSource dataSource = null;
private static Connection c = null;
private int id;
private String title;
private String url;
private int year;
public Movie(){}
if theres more info needed please ask :), this has been reallllly bugging me.
I am new here so excuse me if my answer is not perfect. As you have mentioned that you want to import your own package which contains Movie class. I tried to implement all your main methods and it's running perfect and I am getting my value from Movie.java.
movieServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import movie.Movie;
public class movieServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
Movie Movie = new Movie();
request.setAttribute("movies", Movie.getAllMovies());
out.println(request.getAttribute("movies"));
}
}
Movie.java
package movie;
public class Movie {
String s;
public Movie(){
s="hello zDoctor";
}
public String getAllMovies(){
return s;
}
}
servlet output
file structure
I need to modify the code that read a text file, in a dynamically to read text or html files.
Now the code use only
response.setContentType("text/plain");
because the file is saved in text format. But I would like to save in html format to manage all tag and have a better view, but If I modify in
response.setContentType("text/html");
all file saved as text have a wrong viewer
My code is:
package uk.co.mycode.fax.controller;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import uk.co.mycode.fax.dao.mycodeFaxDAO;
import uk.co.mycode.fax.domain.Image;
import uk.co.morpheus.logging.Logger;
public class FaxImageRequest
extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { performTask(request, response); }
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { performTask(request, response); }
public void performTask(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String url = request.getParameter("U");
if (url == null || url.length() < 1) {
url = request.getParameter("URL");
}
Logger.log(4, getClass().getName(), "<**** Entered FaxImageRequest (" + url + ") ****>");
try {
Cookie[] cookies = request.getCookies();
String userId = "";
if (cookies != null) {
for (int i = 0; i < cookies.length; i++) {
if (cookies[i].getName().equals("IMPS3IAuserid")) {
userId = cookies[i].getValue();
break;
}
}
}
if (userId.length() < 1) {
userId = "NOT LOGGED ON";
}
mycodeFaxDAO dao = mycodeFaxDAO.getInstance();
Image image = dao.getImage(url);
Logger.log(4, getClass().getName(), "Image: " + image);
if (image != null) {
ServletOutputStream out = response.getOutputStream();
if (image.type.toLowerCase().startsWith("f")) {
response.setContentType("image/tiff");
} else {
//----------------------------------------------------------------------------
response.setContentType("text/plain");
//----------------------------------------------------------------------------
}
for (int i = 0; i < image.bytes.length; ) { out.write(image.bytes, i, (image.bytes.length - i > 4096) ? 4096 : (image.bytes.length - i)); i += 4096; }
dao.updateImageArchive(userId, request.getParameter("U"));
} else {
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<HTML>");
pw.println("<BODY>");
pw.println("<B>No image found</B>");
pw.println("</BODY>");
pw.println("</HTML>");
pw.close();
}
} catch (Throwable th) {
Logger.log(1, getClass().getName(), "Error during image read or update:" + th.getMessage());
th.printStackTrace();
}
Logger.log(4, getClass().getName(), "<**** Finished FaxImageRequest ****>");
}
}
I tried to write this:
if (response.getContentType() == null) {
response.setContentType("text/html");
} else {
response.setContentType("text/plain");
}
but it is always null.
Thanks for the support.
The correct answer, if I may bring up your "hosting platform" - is that such settings are usually changed in the hosting platform. I have hosted three different web domains with GCS (Google Cloud Server) because it is (mostly) free.
In Google Cloud, when you save a file, generally it will recognize what type of file you have save (Content-Type) based on the file's extension - '.txt' or '.html'. The Content-Type setting can be changed in Google's bucket file explorer GUI using a mouse. It may also be changed manually at the command line using the GSUTIL command line program.
You may make calls to GSUTIL from Java by using Java's shell execution libraries (the Java Standard library routines for calling UNIX Shell commands). This is what I do...
... But you may even download Google's Java Jar files to access GCS and make Java based calls to GCS for doing things like changing the content type of a storage bucket file....
If you were using.MSFT Azure, or GoDaddy or something else this would be different.
So I have two files, the servlet:
package com.servlets;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.FileUtils;
import com.java.DataDownloader;
/**
* Servlet implementation class downloaderServ
*/
public class DownloaderServ extends HttpServlet {
private static final long serialVersionUID = 1L;
DataDownloader dl;
/**
* #see HttpServlet#HttpServlet()
*/
public DownloaderServ() {
super();
dl = new DataDownloader();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
dl.download();
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
The application which does the processing:
package com.java;
import java.io.*;
import java.net.*;
import org.apache.commons.io.*;
public class DataDownloader {
private static boolean get(String address, String fileName) {
try {
URL url = new URL(address);
File f = new File(fileName);
FileUtils.copyURLToFile(url, f);
}
catch(MalformedURLException e) {
System.out.println(e);
return false;
}
catch(IOException e) {
System.out.println(e);
return false;
}
return true;
}
public boolean download() {
String[][] urls = new String[3][2];
urls[0][0] = "http://data.london.gov.uk/datafiles/crime-community-safety/mps-recordedcrime-borough.csv";
urls[0][1] = "crimes.csv";
urls[1][0] = "http://data.london.gov.uk/datafiles/housing/average-house-prices-borough.xls";
urls[1][1] = "prices.xls";
urls[2][0] = "http://data.london.gov.uk/datastorefiles/datafiles/demographics/gla_2012rnd_SHLAA_based_borough_projections.xls";
urls[2][1] = "population.xls";
for (int i = 0; i < 3; i++) {
if (get(urls[i][0], urls[i][1]) == false) {
System.out.println(false);
return false;
}
}
return true;
}
}
I can run it with no problems but there does not seem to be any files downloaded. I have also printed out the return values (true or false) and it does print true. Is downloading a file not as simple as this?
Code looks fine, so if prints true and you don't see any exceptions as well while running the program, then your problem is you are not able to locate the files copied from url.
Since no directories are specified in destination File, it must be dumping your file in the folder at which you are invoking java program. If it's an IDE (Eclipse) etc with which program is being run, refresh and check the associated project folder.
Kevin, as you clearly didn't get any exception, here's what I suggest: please right click your Eclipse project root folder and click: Refresh. Your files will be there directly at that path.
Also, I'm removing the servlet tag from your question as the issue has totally nothing to do with servlets. It's just that you're using them inside a servlet, but this same code would work in isolation, even outside of Java EE in fact.
I added fileutils instead.
I changed the it so an absolute path is taken e.g.
File f = new File("C:\\data\\" + fileName);
This works. Does having it in a servlet change it so an absolute path is needed and render relative paths unusable? I tested the downloading part outside of a servlet and it works with relative paths or it just downloads into project folder if nothing is specified.
I'm trying create pdf in java with google app engine but it doesn't work yet:
#SuppressWarnings("serial")
public class GuestbookServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType("application/pdf");
try {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream("HelloWorld.pdf"));
document.open();
document.add(new Paragraph("Hello World"));
document.close();
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
This is the error:
HTTP ERROR 500
Problem accessing /guestbook. Reason:
com/itextpdf/text/DocumentException
Caused by:
java.lang.NoClassDefFoundError: com/itextpdf/text/DocumentException
I have read the incompatibility with java.awt and java.nio with google appengine. But I don't know how to do it. Is there any special version of itext to google app engine? Or do you know any clue that can help me?
Yes, there's a GAE version of iText. See http://lowagie.com/iPadSchools to watch a demo. The GAE port is distributed by iText Software. There's no link to get it online.
package mx.gob.campeche.sit.web.reportes;
import java.io.IOException;
import java.io.OutputStream;
import javax.inject.Inject;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import mx.gob.campeche.sit.doc.recibo_oficial.ReciboOficial;
#WebServlet("/reciboOficial")
public class ReporteReciboOficialServlet extends HttpServlet {
#Inject
ReciboOficial reciboOficial;
/**
*
*/
private static final long serialVersionUID = 1L;
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpServletRequestWrapper srw = new HttpServletRequestWrapper(request);
String folio = "";
if (request.getParameterMap().containsKey("folio")) {
folio = request.getParameter("folio");
System.out.println("contenido" + folio);
}else
if (request.getParameterMap().containsKey("numero")) {
folio = request.getParameter("numero");
System.out.println("contenido" + folio);
}else{
throw new ServletException("No ingreso parametro");
}
byte[] pdfData = reciboOficial.crearReciboOFicialCajas(folio, srw.getRealPath(""));
response.setContentType("application/pdf");
response.reset();
response.setContentType("application/pdf");
response.setHeader("Content-disposition", "inline; filename=\"" +"samplePDF2.pdf" +"\"");
OutputStream output = response.getOutputStream();
output.write(pdfData);
output.close();
}
this is small example, this help
I have a problem with portlet. When i write in portlet.xml standart line
<portlet-class>com.liferay.util.bridges.mvc.MVCPortlet</portlet-class>
my jsp pages works fine. But when im add my portlet-class
<portlet-class>test.uploadport</portlet-class>
java code in jsp page dont execute. Im not talking about view.jsp im talk about pages which called from view.jsp.
I think problem in doView() from portlet
uploadport.java
package test;
import java.io.*;
import java.util.Iterator;
import java.util.List;
import javax.portlet.*;
import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.disk.*;
import org.apache.commons.fileupload.portlet.*;
import org.apache.commons.fileupload.servlet.*;
import org.apache.commons.fileupload.util.*;
public class uploadport extends GenericPortlet {
private String error;
public void doView(RenderRequest req, RenderResponse res)
throws IOException, PortletException
{
WindowState state = req.getWindowState();
res.setContentType("text/html");
PortletSession session = req.getPortletSession(true);
PortletContext context = getPortletContext();
PortletRequestDispatcher rd;
rd = context.getRequestDispatcher("/view.jsp");
rd.include(req, res);
}
public void processAction(ActionRequest req, ActionResponse res)
throws IOException, PortletException
{
System.out.println("VASAY - PIROZJOK");
PortletSession session = req.getPortletSession(true);
DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
PortletFileUpload portletFileUpload = new PortletFileUpload(diskFileItemFactory);
List<FileItem> list=null;
String mifpath= "1";
String path = " ";
String mif = " ";
String from = "\\\\";
String to ="/";
String error="";
try{
list = portletFileUpload.parseRequest(req);
Iterator<FileItem> it = list.iterator();
//response.setContentType("text/html");
while ( it.hasNext() )
{
FileItem item = (FileItem) it.next();
File disk = new File("C:/uploaded_files/"+item.getName());
path = disk.toString();
String code = new String(path.substring(path.lastIndexOf("."), path.length()).getBytes("ISO-8859-1"),"utf-8");
if (code.equalsIgnoreCase(".zip"))
{
System.out.println("PIROZJOK");
mifpath=path;
mif = mifpath.replaceAll(from, to);
item.write(disk);
error=unzip.unpack(mif, "C:/uploaded_files");
}
else
{
error = "Выбранный файл не является архивом zip";
}
}
}
catch ( Exception e ) {
log( "Upload Error" , e);
}
}
private void log(String string, Exception e)
{
// TODO Auto-generated method stub
}
}
Why its heppening?
This problem was particullary solved.
1. need to use MVC portlet not Generic Portlet
2. delete doView() from portlet
That all. But thare is anther problems.
1. MVC portlet not a best choise.
2. How to send parametrs to view.jsp from portlet without doView()?