How can i upload file using ajax post request and jsp

Hi
this is my code files
addPhoto.jsp
<html>
<head>
<title>Add Photo</title>
<script>
var optionNo = 0;
var i=1;
var val=0;
var file = 0;
var exten = new Array(".jpg",".jpeg",".gif");
function addValues()
     for(var i=0;i<5;i++)
          optionNo += 1;
          oNewOption = new Option();
          oNewOption.text = optionNo;
          oNewOption.value = optionNo;
          addSelect.add(oNewOption);
function addBoxes()
     var str = "";
     var j=0;
     val = document.getElementById('addSelect').value;
     for(j=1; j<= val; j++)
          str = str + '<font size=3>file:' + j + '</font>';
          str = str + '<input type="file" id=filepath'+ j +' name=file'+ j + ' onchange="uploadFile(hidden'+ j + '.value)"><div id="result'+ j +'"></div>
          str = str + '<input type="hidden" name="hidden' + j + '" value=' + j +'>';
     document.getElementById('addPhoto').innerHTML = str;
function uploadFile(value)
var str = "filepath" + value;
file = value;
var param = document.getElementById(str).value;
var parameter = "filepath=" + param;
alert(parameter.length);
if(checkValidity(param))
var url = "uploadFile.jsp";
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
} else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
req.open("POST", url, true);
req.setRequestHeader("Content-type", "multipart/form-data");
//req.setRequestHeader("Content-length", parameter.length);
req.setRequestHeader("Connection", "close");
req.onreadystatechange = callback;
req.send(null);
     else
          document.getElementById("result" + file).innerHTML = "upload .jpeg,.jpg,.gif Files Only";
function callback() {
if (req.readyState == 4) {
updatepage(req.responseText);
function updatepage(str){
     document.getElementById("result" + file).innerHTML = str;
function checkValidity(str)
     var i=0;
     var j=0;
     var str1 = str.substring(str.lastIndexOf("."),str.length);
     alert(str1);
     for(i=0;i<exten.length;i++)
     if(str1.search(exten) != -1)
          j++;
          break;
     if(j>0)
          return true;
     else
          return false;
</script>
</head>
<body onload="addValues()">
<h5>Add Photo(s)</h5>
<select id="addSelect" name="addSelect" onchange="addBoxes()">
<option id="select" selected>Select</option>
</select>
<div id="addPhoto"></div>
</body>
</html>
uploadFile.jsp
<%@page import="java.io.*"%>
<%
/*try
String contentType = request.getContentType();
     System.out.println(request.getMethod());
     System.out.println("Content type is :: " +contentType);
     if ((contentType != null) && (contentType.indexOf("multipart/form-data") >= 0))
          DataInputStream in = new DataInputStream(request.getInputStream());
          DataInputStream in1 = in;
          int formDataLength = request.getContentLength();
System.out.println(formDataLength);
          byte dataBytes[] = new byte[formDataLength];
          int byteRead = 0;
          int totalBytesRead = 0;
          while (totalBytesRead < formDataLength)
               byteRead = in1.read(dataBytes, totalBytesRead, formDataLength);
               totalBytesRead += byteRead;
          out.println("<br>totalBytesRead : " + totalBytesRead + " : formDataLength = " + formDataLength);
     } catch(Exception e) {
          e.printStackTrace();
     try
     String filePath = request.getParameter("filepath");
     System.out.println(filePath);
     File f= new File(filePath);
     String path = f.getName();
     String contentType = request.getContentType();
     System.out.println(contentType);
     //InputStream in = new FileInputStream(filePath);
     DataInputStream in = new DataInputStream(request.getInputStream());
     int formDataLength = request.getContentLength();
     System.out.println(formDataLength);
byte[] buf = new byte[1024];
OutputStream out1 = new FileOutputStream("c:/docs/" + path);
int len;
while ((len = in.read(buf)) > 0) {
out1.write(buf, 0, len);
in.close();
out1.close();
     out.write("File Uploaded SucssesFully");
catch(Exception e)
     e.printStackTrace();
     out.write("error while Writing File");
%>
the above code in request.getContentType() i am getting 0. I am not passing the content length. for the same application with out using Ajax i am
getting the size of file... it is very very urgent for me.. pls help me out on this...
Any one having the code on this pls mail me the code...
my mail id ... [email protected]
Regards
Ashok Kumar

Sure, you can upload a file, using a form input element of type file. You pick this up with a servlet, though you need a special request wrapper to sort out the multi-part request you get back that way (there's a suitable package on jakarta.apache.org/commons)
The servlet decrypts the file and can pass the results to a JSP for display.
Don't try to do the complicated stuff in a JSP, it all gets incredibly messy, and that's not what JSPs are for.

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