Java EE (Java Enterprise Edition) General Discussion

I'm trying to send large amounts of text data to the server using POST rather than GET, using Ajax
However, I am only able to send a max of 9.76 kb

I start with a jsp page, which calls a javascript method that utilises Ajax, which sends the text in a parameter in a XMLHttpRequest object
to a servlet. The text is derived from options values in a multi select combo box.

Here's my code:

Code snippet from .jsp page:

        <table>
	   <form name="form1" id="form1" method="POST">
	      <tr>
	         <td>
		   <select name="sel" id="sel" multiple="multiple" size="0"></select>
		</td>
		<td>
		   <input type="button" id="sendOpts" name="sendOpts" value="Send Options" onClick="jsObj.sendOpts()">
		</td>
	     </tr>
	  </form>
       </table>

Code snippet from jsObj.js file:

//=================================================
// jsObj object
//=================================================
jsObj = new jsObj();

function jsObj() {

	this.sendOpts = function() {

		if(!confirm('Send Option Values?'))
			return;
			
		if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari
			xmlhttp=new XMLHttpRequest();
		} else { // code for IE6, IE5
			xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
		
		xmlhttp.onreadystatechange=function() {
			if(xmlhttp.readyState==4) { // 4 = The request is complete
				if (xmlhttp.status==200 || window.location.href.indexOf("http")==-1) {
					alert(xmlhttp.responseText); // When I copy and paste all the text from this alert to text editor and save the file, the largest the file can be is 9.76 kb.
				}
			}
		}
		
		var url = 'testSize'; // Servlet that simply retrieves the sent String in a parameter and sends it back to this method
		var sel = document.getElementById('sel');
		var str = sel.name + '=';
		var delim = ':';
		
		for(var i = 0; i < sel.length; i++) {
			str += encodeURIComponent(sel.options.value + delim); // 'encodeURIComponent' encodes any special characters within the parameter values

		}

		

		xmlhttp.open("POST",url,true);

		xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); // This is needed for any POST request made via Ajax

		xmlhttp.send(str); // send the parameter and it's value to the servlet

	}

}
Code snippet from 'testSize' servlet:
package test;



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 java.util.*;



public class TestSize extends HttpServlet {



	public synchronized void doGet(HttpServletRequest request,

		HttpServletResponse response) throws ServletException,IOException {

		PrintWriter out = null;

		try {

			response.setContentType("text/html");

		out = response.getWriter();

			String str = request.getParameter("sel");

			str = str.substring(0, str.length()-1); // cut off last delimiter

			out.println(str);

			} catch (Exception e) {



		}

	}



	public synchronized void doPost(HttpServletRequest request,

		HttpServletResponse response) throws ServletException, IOException {

		doGet(request, response);

	}

}
Any help greatly appreciated.

Edited by: Irish_Fred on Feb 25, 2010 5:14 AM