I have problem with get a value from combobox in my .jsp file to servlet.
I use method request.getParameter i other servlets and it works. In this class it don't.
I was also trying to get value from text field to this servlet but also don't work. I don't have any idea how to solve this problem.
I have combobox like that:
<form action="upload" method="POST" enctype="multipart/form-data">
<p class="folders_save">Folder:
<select name="folders1" id="user">
<%
user = (User)session.getAttribute("user");
listOfFolders = user.listOfFolders();
if(listOfFolders != null){
for(File file : listOfFolders){
out.print("<option value="+file.getName()+">"+file.getName()+"</option>");
}
}
%>
</select>
</p>
<input class="pole" type="file" name="file" />
<input class="wrzuc" type="submit" value="Wrzuc!">
</form>
I'm tring to get value:
String folder = request.getParameter("folders1");
My jsp file
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org /TR/html4/loose.dtd">
<html>
<head>
<%# page import="tools.User" %>
<%# page import="java.io.File" %>
<%# page import="java.text.DecimalFormat" %>
<%#page language="Java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="style.css" />
<title>Serwer dysku sieciowego </title>
</head>
<body>
<div class="container">
<div class="ramka_zaproszenie">
<%
File[] listOfFolders;
User user;
String username;
String status = null;
if(session.getAttribute("user")!=null){
user = (User)session.getAttribute("user");
username = user.getLogin();
status = user.getType().toString();
} else {
username = "unknown";
}
%>
<p class="loguj">Witaj, <%= username %>!</p><br>
<% if(session.getAttribute("user")!=null){ %>
<p class="tekst">Wrzuc plik na serwer:</p>
<form action="upload" method="POST" enctype="multipart/form-data">
<p class="folders_save">Folder:
<select name="folders1" id="user">
<%
user = (User)session.getAttribute("user");
listOfFolders = user.listOfFolders();
if(listOfFolders != null){
for(File file : listOfFolders){
out.print("<option value="+file.getName()+">"+file.getName()+"</option>");
}
}
%>
</select>
</p>
<input class="pole" type="file" name="file" />
<input class="wrzuc" type="submit" value="Wrzuc!">
</form>
<form action="folder" method="get">
<p class="tekst"> Folder: <br><input class="pole" id="Folder" type="text" name="folderName" />
<br /></p>
<input class="zatwierdz" type="submit" id="submit" value="Utwórz" /><br>
</form>
<br />
<% if(status.equalsIgnoreCase("ADMIN")){ %>
<a class="wroc" href="zmiana_rozmiaru.jsp">Zmiana Pojemnosci</a>
<%}%>
<br />
<br />
<p class="tekst">Posiadane pliki na serwerze:</p>
<form method="post">
Folder:
<select name="folders">
<option value=0 selected="selected" >Wybierz folder</option>
<%
user = (User)session.getAttribute("user");
listOfFolders = user.listOfFolders();
if(listOfFolders != null){
for(File file : listOfFolders){
out.print("<option value="+file.getName()+">"+file.getName()+"</option>");
}
}
%>
</select>
<input type="submit" value="Wybierz"><br>
</form>
<br />
Pliki z folderu: <%=request.getParameter("folders")%>
<center><table id="tabela">
<tr class="alt">
<th>Nazwa</th>
<th>Rozmiar</th>
<th>Pobierz</th>
<th>Usun</th>
</tr>
<%
System.out.println(request.getParameter("folders"));
user = (User)session.getAttribute("user");
File[] listOfFiles = user.listOfFiles(request.getParameter("folders"));
if(listOfFiles != null){
for(File file : listOfFiles){
DecimalFormat twoDForm = new DecimalFormat("#.##");
out.print("<tr class=\"alt\"><td>" + file.getName()+"</td><td>" +twoDForm.format((double)file.length()/1024.0)+" KB</td><td align=center> <img border=\"0\" src=\"downloadsmall.png\"></td><td align=center><a src=\"deletesmall.png\" href=\"delete?filePath="+file.getAbsolutePath()+"\" ><img border=\"0\" src=\"deletesmall.png\"></a></td></tr>");
}
}
%>
</table>
</center><br>
<form action="logout" method="post">
<input type="image" src="wylacznik.png" id="submit">
</form>
<br><br>
<%
if (session.getAttribute("warning") != null) {
%>
<span><%= session.getAttribute("warning") %></span>
<%
session.removeAttribute("warning");
}
%>
<% } %>
<div class="footer">Copyright 2013 by JavaProjectTeam.</div>
</div>
</div>
</body>
</html>
And my servlet file
<pre>package servlets;
import java.io.*;
import java.sql.SQLException;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.annotation.WebServlet;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import java.sql.Connection;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import tools.Connector;
import tools.User;
#WebServlet("/upload")
public class UploadServlet extends HttpServlet {
private boolean isMultipart;
private String filePath;
private File file ;
public void init(){
// Get the file location where it would be stored.
filePath = getServletContext().getInitParameter("file-upload");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
// Check that we have a file upload request
request.setCharacterEncoding("UTF-8");
String folder = request.getParameter("folders1");
HttpSession session = request.getSession(true);
User user = (User)session.getAttribute("user");
isMultipart = ServletFileUpload.isMultipartContent(request);
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter( );
if( !isMultipart ){
session.setAttribute("warning", "Nie masz zadnych plikow");
response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
response.setHeader("Location", "hello.jsp");
return;
}
DiskFileItemFactory factory = new DiskFileItemFactory();
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax(user.getSpace() * 1024);
try{
// Parse the request to get file items.
List fileItems = upload.parseRequest(request);
// Process the uploaded file items
Iterator i = fileItems.iterator();
while ( i.hasNext () )
{
FileItem fi = (FileItem)i.next();
if ( !fi.isFormField () )
{
// Get the uploaded file parameters
String fileName = fi.getName();
// Write the file
if( fileName.lastIndexOf("\\") >= 0 ){
file = new File( filePath+"\\"+user.getId()+"\\"+folder+"\\"+
fileName.substring( fileName.lastIndexOf("\\"))) ;
}else{
file = new File( filePath+"\\"+user.getId()+"\\"+folder+"\\"+
fileName.substring(fileName.lastIndexOf("\\")+1)) ;
}
fi.write(file);
System.out.println(file.getName());
try{
Connection connection = new Connector().getConnection();
DecimalFormatSymbols otherSymbols = new DecimalFormatSymbols(Locale.GERMAN);
otherSymbols.setDecimalSeparator('.');
otherSymbols.setGroupingSeparator('.');
DecimalFormat twoDForm = new DecimalFormat("#.##", otherSymbols);
System.out.println(twoDForm.format((double)file.length()/1024.0));
connection.createStatement().executeUpdate("UPDATE `users` SET `space` = `space`-"+twoDForm.format((double)file.length()/1024.0)+" where id="+user.getId());
} catch(SQLException e){
e.printStackTrace();
}
session.setAttribute("warning", "Plik został dodany do wirtualnego dysku.");
response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
response.setHeader("Location", "hello.jsp");
}
}
out.println("</body>");
out.println("</html>");
}catch(Exception ex) {
System.out.println(ex);
session.setAttribute("warning", "File is too big! Only "+user.getSpace()+"KB left.");
response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
response.setHeader("Location", "hello.jsp");
}
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
throw new ServletException("GET method used with " +
getClass( ).getName( )+": POST method required.");
}
}<code>
It's because you're sending a multipart/form-data request while that's by default not supported by servlets. I however notice that you're still using the "legacy" Apache Commons FileUpload to obtain the uploaded file instead of new Servlet 3.0 provided HttpServletRequest#getPart(). In that case, you've basically 2 options:
Stick to Commons FileUpload. You should be collecting regular form fields in the else block of your if (!fi.isFormField()) which you're currently completely ignoring.
if (!fi.isFormField()) {
// Collect uploaded file from fi.
} else {
// Collect normal form field from fi.
}
Get rid of Commons FileUpload and use #MultipartConfig annotation.
#WebServlet("/upload")
#MultipartConfig
public class UploadServlet extends HttpServlet {
This way you can get files by request.getPart() and keep using request.getParameter() the usual way for regular form fields.
See also:
How to upload files to server using JSP/Servlet?
Unrelared to the concrete problem, that's not a combobox, but that's a dropdown. A combobox is an editable dropdown. Further, writing Java code in JSP is a bad practice. Java code belongs in Java classes like a servlet. To loop over options, use JSTL <c:forEach>. And, writing HTML code in a Java class like a servlet is a bad practice. HTML code belongs in a JSP file. Use RequestDispatcher#forward() to present results in a JSP. See further also our servlets wiki page.
Oh, you've a major threadsafety problem in your servlet. There's only one instance of a servlet during applications lifetime which is shared across all HTTP requests. Those fields
private boolean isMultipart;
private String filePath;
private File file ;
would be shared across all HTTP requests resulting in potential major problems when multiple users concurrently use the same servlet at the same moment. Get rid of them and move them to inside the doXxx() method block.
Related
This question already has answers here:
How to save generated file temporarily in servlet based web application
(2 answers)
Closed 5 years ago.
I am creating a Java Web Application which takes data from a HTML form and saves it to a text file using a Servlet. However when I run the application I cannot see the text file anywhere so I am unsure if it was created successfully or not. Does anyone have any ideas why the file is not appearing?
Here is my code for the HTML form:
<html>
<head>
<title>Register Customer</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<form name = "regcustomer" method = "get" action = "CustomerServlet" >
Customer Name
<input type="text" name="customerName"> <br>
Customer Address
<input type="text" name="customerAddress"> <br>
Telephone Number
<input type="text" name="telNo"> <br>
Email
<input type="text" name="email"> <br>
Cost per KG shipped
<input type="text" name="costPKG"> <br>
<input type="submit" value="Register"> <br> <br>
Back
</form>
</body>
And here is my code for the servlet:
package Servlets;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CustomerServlet extends HttpServlet {
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
PrintWriter pw = response.getWriter();
String customerName;
customerName = request.getParameter("customerName");
String customerAddress = request.getParameter("customerAddress");
String telNo;
telNo = request.getParameter("telNo");
String email = request.getParameter("email");
String costPKG = request.getParameter("costPKG");
try{
File file = new File("C:/xyz.txt");
FileWriter fstream = new FileWriter(file,true);
try (BufferedWriter out = new BufferedWriter(fstream)) {
out.write(customerName+" "+customerAddress+" "+telNo+" "+email+"
"+costPKG);
out.newLine();
}
pw.println("File is created successfully");
}
catch (IOException e){
System.err.println("Error: " + e.getMessage());
}
}
}
Any suggestions would be much appreciated
Try adding the line:
#WebServlet(urlPatterns = { "/CustomerServlet" })
before:
public class CustomerServlet extends HttpServlet {
Note: If you are using old container (not implemented Servlet 3.0, like Tomcat 6.0), then you have to edit web.xml.
I am creating a project with JSP & Servlet (and entity beans) and I am trying to create a form where a user registers as a customer and is then redirected to a reservation page.
I want to keep the Id for the Customer that just registered and fill it into a disabled text field and then create a reservation on the next page. But whenever I try to load the customer class through jsp the whole application crashes with a NullPointerException.
It seems like the program crashes when it reaches the jsp-tags to fetch my customer, since it does print out the c.cPnr to the console as well as the test in the JSP-file.
<%# page import = "g24.isp.ejb.Customer" %>
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Welcome to Ski Village!</title>
<link rel="stylesheet" href="new/css/normalize.css">
<link rel="stylesheet" href="new/css/stylesheet.css">
<link href='https://fonts.googleapis.com/css?family=Fjalla+One|Poppins:400,500,600' rel='stylesheet' type='text/css'>
<script src="javascript/script.js" type="text/javascript"></script>
</head>
<body>
<% System.out.println("test"); %>
<% Customer c = (Customer) session.getAttribute("customer"); %>
<div id="container">
<!-- HEADER + MENU -->
<header>
<div class="logo"><!-- Ski Village Logo --></div>
<div class="menu">
<ul>
<li> Home </li>
<li class="left-menu"> About </li>
<li class="right-menu"> Book </li>
<li> <a href="index.html" > Test</a></li>
</ul>
</div>
</header>
<!-- PAGE CONTENT -->
<div id="wrapper">
<div class="center-form">
<form action="/HotelClient/HotelServlet" name="resForm" method="post">
<input type="text" name="cPnr" value="<%= c.getcPnr() %>" >
<input type="number" name="week" min="1" max="52" placeholder="Select week" >
<select name="cno">
<option value="1">Adventure Cabin
</option>
<option value="2">Cozy Cabin
</option>
<option value="3">Snowy Cabin
</option>
<option value="4">Hacker Cabin
</option>
</select>
<input type="submit" name="checkres" value="Check availability">
<input type="submit" name="submitresform" value="Create reservation" type="hidden">
<input name="operation" value="bajskorv" type="hidden">
</form>
</div>
<!-- FOOTER + SOCIAL ICONS -->
<footer>
<img src="img/facebook-logo.png" class="social-icon" alt="facebook logo">
<img src="img/instagram-logo.png" class="social-icon" alt="instagram logo">
<img src="img/twitter-logo.png" class="social-icon" alt="twitter logo">
<p>© 2016 | Ski Village</p>
</footer>
</div>
</div>
</body>
</html>
Servlet code:
package g24.isp.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.EJB;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import g24.isp.ejb.Cabin;
import g24.isp.ejb.Customer;
import g24.isp.ejb.Hotel;
import g24.isp.ejb.Reservation;
import g24.isp.facade.Facade;
import g24.isp.facade.FacadeLocal;
import g24.isp.ejb.MethodClass;
/**
* Servlet implementation class HotelServlet
*/
#WebServlet("/HotelServlet")
public class HotelServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
#EJB
private FacadeLocal facade;
/**
* #see HttpServlet#HttpServlet()
*/
public HotelServlet() {
super();
// 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
PrintWriter out = response.getWriter();
out.println("MainServlet-doGet");
out.close();
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
String url = "did not get an url";
// Get hidden field
String operation = request.getParameter("operation");
MethodClass mc = new MethodClass();
if (operation.equals("createcustomer")) {
String cPnr = request.getParameter("txtcPnr");
String cAddress = request.getParameter("txtcAddress");
String cPhone = request.getParameter("txtcPhone");
String cName = request.getParameter("txtcName");
if (facade.findByCpnr(cPnr) == null) {
Customer customer = new Customer();
customer.setcPnr(cPnr);
customer.setcAddress(cAddress);
customer.setcPhone(cPhone);
customer.setcName(cName);
facade.createCustomer(customer);
url = "/new/reservation.jsp";
} else {
url = "new/newcust.jsp";
}
}
else if (operation.equals("createreservation")) {
String cpnr = request.getParameter("txtcPnr");
int week = mc.ParseStringToInt(request.getParameter("week"));
int cno = mc.ParseStringToInt(request.getParameter("cno"));
Customer cs = facade.findByCpnr(cpnr);
Cabin cb = facade.findByCabinNo(cno);
if (cb != null && cs != null) {
Reservation res = new Reservation();
res.setCabin(cb);
res.setCustomer(cs);
res.setrDate(week);
facade.createReservation(res);
url = "/Index.jsp";
} else {
System.out.println("Did not enter if statement");
url = "/Index.jsp";
}
}
else if (operation.equals("newcustomer")) {
url = "/new/newcust.jsp";
}
else if (operation.equals("setcustomer")) {
System.out.println("Servlet - Create reservation");
String cpnr = request.getParameter("txtcPnr");
System.out.println(cpnr);
url = "/new/reservation.jsp";
Customer customer = facade.findByCpnr(cpnr);
if (customer != null) {
System.out.println(customer.getcName());
session.setAttribute("customer", customer);
url = "/reservation.jsp";
}
else {
System.out.println("Customer value is null");
}
}
System.out.println(url);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(url);
dispatcher.forward(request, response);
}
}
May be it's not setting the session attribute and when c.getcPnr() gets executed, it throws NullPointerException. Can you check whether the attribute is set in the session? You can try printing out 'c' in the jsp.
I solved the problem - i was trying to find the customer by accessing the facade.findBycPnr() method.
The solution was to session.setAttribute(customer, cust) when creating the customer.
How to pass text field value from jsp to java class.
my .jsp code is
<html>
<head></head>
<body>
<FORM>
Please enter your name:
<INPUT TYPE="TEXT" NAME="text1">
<BR>
<INPUT TYPE="SUBMIT" value="Submit">
</FORM>
</body>
</html>
my .java class code is
here in string str i need to get the textfield value.
class sample{
String str=""; //C:/check/svntes
File exportDir = new File(str);
if (exportDir.exists()) {
SVNErrorMessage err = SVNErrorMessage.create(SVNErrorCode.IO_ERROR, "Path ''{0}'' already exists", exportDir);
throw new SVNException(err);
}
exportDir.mkdirs();
}
Hmm .. let's assume how your jsp & java file interact with each other. Correct if im wrong.
A.jsp file
<html>
<head></head>
<body>
<FORM ACTION="B.JSP" METHOD="POST"> //edited part
Please enter your name:
<INPUT TYPE="TEXT" NAME="text1">
<BR>
<INPUT TYPE="SUBMIT" value="Submit">
</FORM>
</body>
</html>
B.JSP
<jsp:useBean id="sample" scope="page" class="com.home.file.sample" /> // sample is java file name
String name = request.getParameter("text1");
int iRowAffected = 0;
//-------now pass parameter "name" to your sample java file
sample.function_name("name");
Sample.java
public class sample
{
public int function_name(String NAME)
{
String str = NAME;
File exportDir = new File(str);
if (exportDir.exists()) {
SVNErrorMessage err = SVNErrorMessage.create(SVNErrorCode.IO_ERROR, "Path ''{0}'' already exists", exportDir);
throw new SVNException(err);
}
exportDir.mkdirs();
//continue with your coding
}
}
To passing value from JSP to Java, you need java Servlet.
Call servet from form tag and then get value using request.getParameter("your value") api of request object.
JSP Page:
<form action="HelloServlet" method="POST">
Please enter your name:
<input type="text" name="text1" id="text1">
<br>
<input type="submit" value="Submit">
</form>
Servlet :
public class HelloWorld extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// reading the user input
String text1= request.getParameter("text1");
}
}
Is your java class a servlet?
Because then you need to post to your servlet like this:
<form action="ServletName" method="GET">
Please enter your name:
<input type="text" name="text1" />
<br />
<input type="submit" value="Submit" />
</form>
And then in your servlet you can get the string value like this:
String str = request.getParameter("name");
name.jsp
<FORM action="/submitName" method="get">
Please enter your name:
<INPUT TYPE="TEXT" NAME="text1">
<BR>
<INPUT TYPE="SUBMIT" value="Submit">
</FORM>
First of all, in your above jsp file two things are missing action
and method(optional, by default it takes "get") attributes.
Now to get the input value in you java class, you need to write a Servlet class and configure it in the web.xml with a url mapping "/submitName".
MyServlet.java
// Import required java libraries
// Extend HttpServlet class
public class MyServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
String name = request.getParameter("text1"); //should be same name as form input name
System.out.println(name);
}
}
web.xml will be as follows,
<web-app>
<servlet>
<servlet-name>myservlet</servlet-name>
<servlet-class>MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>myservlet</servlet-name>
<url-pattern>/submitName</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>name.jsp</welcome-file>
</welcome-file-list>
</web-app>
I got answer by this way..Its working fine.
my.jsp code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form >
Enter the word: <input type="text" name="word">
<input type="submit">
<%# page import = "dem.hashmap"%> <!-- //importing java class -->
<%
hashmap hm = new hashmap(); /* creating reference for my java class */
String inputvalue = request.getParameter("word");
String output = hm.dircreation(inputvalue); /* calling java method */
out.println(inputvalue);
%>
</body>
</html>
my hashmap .java class:
package dem;
import java.io.File;
public class hashmap {
String nav;
public String dircreation(String dir)
{
System.out.println("The Value is--------->"+dir);
boolean success = false;
File directory = new File(dir);
System.out.println("1....The Value is--------->"+dir);
if (directory.exists()) {
System.out.println("Directory already exists ...");
} else {
System.out.println("Directory not exists, creating now");
success = directory.mkdir();
if (success) {
System.out.printf("Successfully created new directory : %s%n", dir);
} else {
System.out.printf("Failed to create new directory: %s%n", dir);
}
}
return nav;
}
}
I need some help with my code.. I have a working Java code to convert PDF to Text file and a JSP page which uploads it.
The thing is I want to link them i.e., when I upload a PDF file it should take the file uploaded as input and generate corresponding converted text file.
FileConverter.java
package fileconverter;
import java.io.File;
import java.io.FileWriter;
import java.io.BufferedWriter;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.parser.PdfTextExtractor;
import java.io.IOException;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.JFileChooser;
public class FileConverter {
public static void main(String[] args) {
selectPDFFiles();
}
//allow pdf files selection for converting
public static void selectPDFFiles(){
JFileChooser chooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("PDF","pdf");
chooser.setFileFilter(filter);
chooser.setMultiSelectionEnabled(true);
int returnVal = chooser.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION) {
File[] Files=chooser.getSelectedFiles();
System.out.println("Please wait...");
for( int i=0;i<Files.length;i++){
convertPDFToText(Files[i].toString(),"Text-File"+i+".txt");
}
System.out.println("Conversion complete");
}
}
public static void convertPDFToText(String src,String desc){
try{
FileWriter fw=new FileWriter(desc);
try (
BufferedWriter bw = new BufferedWriter(fw)) {
PdfReader pr=new PdfReader(src);
int pNum=pr.getNumberOfPages();
for(int page=1;page<=pNum;page++){
String text=PdfTextExtractor.getTextFromPage(pr, page);
bw.write(text);
bw.newLine();
}
bw.flush();
}
}
catch(IOException e){}
}
}
upload.jsp
<%--
Document : upload
Created on : May 16, 2014, 1:42:47 PM
Author : Kelvin
--%>
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head><title>Upload and convert</title>
<body>
<div id="main">
<table id="uploadtbl" width="550" align="center" border="1">
<tr>
<th align="center">Upload and convert pdf to text file</th>
</tr>
<tr>
<td>
<input type="file" name="upload">
</td>
</tr>
<tr>
<td><input type="submit" name="totext" value="Convert To Text" /></td>
</tr>
</table>
</div>
</body>
</html>
Generally you have to create HTML form that sends file to your server using POST method, i.e. something like this:
<form action="/upload" method="POST">
<input type="file" name="upload">
<input type="submit" value="send">
<form>
Now you need server side. You can implement your own servlet (or JSP although it is not recommended to implement code into JSP) and deploy it under URL "/upload". The name of URL does not matter, it just must correspond to what you write in action attribute of your form.
However you do not have to implement servlet. Just take it from apache. I hope this helps.
Here is my index.html:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script src="extra/js/jquery-1.10.2.min.js"></script>
<script src="extra/downloads/dropzone.js"></script>
<script>
$(document).ready(function()
{
var myDropzone = new Dropzone("div#my-awesome-dropzone", {url:'UploadServlet'});
Dropzone.autoDiscover = false;
myDropzone.on("addedfile", function(file) {
// Create the remove button
var removeButton = Dropzone.createElement("<button>Remove file</button>");
// Capture the Dropzone instance as closure.
var _this = this;
// Listen to the click event
removeButton.addEventListener("click", function(e) {
// Make sure the button click doesn't submit the form:
e.preventDefault();
e.stopPropagation();
// Remove the file preview.
_this.removeFile(file);
// If you want to the delete the file on the server as well,
// you can do the AJAX request here.
});
// Add the button to the file preview element.
file.previewElement.appendChild(removeButton);
});
$("#button").click(function(){
var source = $("#my-awesome-dropzone").attr("src");
alert(source);
});
});
</script>
<link rel="stylesheet" href="extra/downloads/css/dropzone.css" type="text/css">
<title>Insert title here</title>
</head>
<body>
<form action="UploadServlet" method="post" enctype="multipart/form-data" >
<table id="table">
<tr>
<td> Unique ID : </td>
<td><input type="text" id="unique" name="unique" maxlength="6" required></input></td>
</tr>
<tr>
<td> Name : </td>
<td><input type="text" id="fullname" name="fullname" maxlength="255" required></input></td>
</tr>
<tr>
<td> Age : </td>
<td><input type="text" id="age" name="age" maxlength="255" required></input></td>
</tr>
<tr>
<td> Address : </td>
<td><input type="text" id="address" name="address" maxlength="255" required></input></td>
</tr>
<tr>
<td> Phone_number </td>
<td><input type="text" id="phonenumber" name="phonenumber" maxlength="10" required></input></td>
</tr>
</table>
<div id="my-awesome-dropzone" class="dropzone"></div>
<div>
<input type="submit" value="Submit data and files!"></input>
</div>
</form>
</body>
</html>
And this my servlet:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package dropzone;
import java.io.File;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.text.html.HTMLDocument.Iterator;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FilenameUtils;
import com.oreilly.servlet.multipart.MultipartParser;
import com.oreilly.servlet.multipart.Part;
import com.oreilly.servlet.multipart.FilePart;
public class UploadServlet extends HttpServlet {
private String fileSavePath;
private static final String UPLOAD_DIRECTORY = "upload";
public void init() {
fileSavePath = getServletContext().getRealPath("/") + File.separator + UPLOAD_DIRECTORY;/*save uploaded files to a 'Upload' directory in the web app*/
if (!(new File(fileSavePath)).exists()) {
(new File(fileSavePath)).mkdir(); // creates the directory if it does not exist
}
}
#Override
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException {
Connection con = null;
List<FileItem> items;
try {
items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);
for (FileItem item : items) {
if (item.isFormField()) {
// Process regular form field (input type="text|radio|checkbox|etc", select, etc).
String fieldname = item.getFieldName();
String fieldvalue = item.getString();
// ... (do your job here)
} else {
// Process form file field (input type="file").
String fieldname = item.getFieldName();
String filename = FilenameUtils.getName(item.getName());
InputStream filecontent = item.getInputStream();
// ... (do your job here)
}
}
} catch (FileUploadException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
/*
String uid = request.getParameter("unique");
String fullname = request.getParameter("fullname");
System.out.println(fullname);
String age = request.getParameter("age");
String address = request.getParameter("address");
String phonenumber = request.getParameter("phonenumber");*/
String path = null;
String message = null;
String resp = "";
int i = 1;
resp += "<br>Here is information about uploaded files.<br>";
try {
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/dropzone", "root", "root");
String sql = "INSERT INTO details(u_id,name,age,address,phonenumber,path) values(?,?,?,?,?,?)";
PreparedStatement statement = con.prepareStatement(sql);
//##########################################################?//
MultipartParser parser = new MultipartParser(request, 1024 * 1024 * 1024); /* file limit size of 1GB*/
Part _part;
while ((_part = parser.readNextPart()) != null) {
if (_part.isFile()) {
FilePart fPart = (FilePart) _part; // get some info about the file
String name = fPart.getFileName();
if (name != null) {
long fileSize = fPart.writeTo(new File(fileSavePath));
resp += i++ + ". " + fPart.getFilePath() + "[" + fileSize / 1024 + " KB]<br>";
} else {
resp = "<br>The user did not upload a file for this part.";
}
}
}// end while
//##################################################################//
statement.setString(1,"uid");
statement.setString(2,"fullname");
statement.setString(3,"age");
statement.setString(4,"address");
statement.setString(5,"phonenumber");
statement.setString(6,"path");
int row = statement.executeUpdate();
if(row>0){
message = "Contact saved";
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
message = "ERROR: " +e.getMessage();
}
finally
{
if(con !=null)
{
try{
con.close();
}
catch(SQLException ex)
{
ex.printStackTrace();
}
}
System.out.println(message);
request.setAttribute("Message",message);
getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);
}
}
}
Here is screenshot of the error:
I want to use the dropzone for uploading images.But if I use multipart/form-data for the form, the fields except the images give null values. I tried using the simple getParameter method. But it doesnt seem to work. Also I tried using Lists but it gives an error. Anyone tried dropzone with jsp?? Help
This is happening because you are not treating the whole form as dropzone but you are treating only the #my-awesome-dropzone div as dropzone .That won't work if you want to submit whole form with the files on one click.
1)In the form tag add an id say id="mydropzone" and class class="dropzone"
<form action="UploadServlet" id="mydropzone" class="dropzone" method="post" enctype="multipart/form-data" >
2)Remove the div from your code which has the id id="my-awesome-dropzone".Then Add a new div to show the files uploaded in drag and drop
<div id="dropzonePreview"></div>
3)add an id to your submit button
<input type="submit" id="sbmtbtn" value="Submit data and files!" />
4)now add this script
<script>
Dropzone.options.mydropzone = {
// url does not has to be written if we have wrote action in the form tag but i have mentioned here just for convenience sake
addRemoveLinks: true,
autoProcessQueue: false, // this is important as you dont want form to be submitted unless you have clicked the submit button
autoDiscover: false,
paramName: 'pic', // this is similar to giving name to the input type file like <input type="file" name="pic" />
previewsContainer: '#dropzonePreview', // we specify on which div id we must show the files
clickable: false, // this tells that the dropzone will not be clickable . we have to do it because v dont want the whole form to be clickable
accept: function(file, done) {
console.log("uploaded");
done();
},
error: function(file, msg){
alert(msg);
},
init: function() {
var myDropzone = this;
//now we will submit the form when the button is clicked
document.getElementById("sbmtbtn").onclick = function(e) {
e.preventDefault(); //this will prevent the default behaviour of submit button because we want dropzone to submit the form
myDropzone.processQueue(); // this will submit your form to the specified action which directs to your jsp upload code
// after this, your whole form will get submitted with all the inputs + your files and the jsp code will remain as usual
//REMEMBER you DON'T have to call ajax or anything by yourself to submit the inputs, dropzone will take care of that
};
} // init end
};
</script>
NOTE :
YOU DO NOT have to write any extra code to make the form submit .
After writing the above code just follow your normal flow to upload
file in jsp like writing the xml and writing the servlet class and fetch all the inputs and files there.
Remember dropzone uses ajax to upload so the form will not be
refreshed when you click submit.
You cannot click on the form to upload files now you have to just
drag the files in the form.