problem with file uploading

hi
i am trying to upload fiel using multipat request.i have classpath cos.jar;it compiled well but i got exception when i run this pgm;i am pasting exception and code;
java.lang.NoClassDefFoundError: com/oreilly/servlet/MultipartRequest
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(Class.java:237)
at org.apache.tomcat.core.ServletWrapper.loadServlet(ServletWrapper.java:268)
at org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:289)
at org.apache.tomcat.core.Handler.service(Handler.java:254)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
at java.lang.Thread.run(Thread.java:484)
code:
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.oreilly.servlet.MultipartRequest;
public class UploadTest extends HttpServlet {
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter out = res.getWriter();
try {
// Blindly take it on faith this is a multipart/form-data request
// Construct a MultipartRequest to help read the information.
// Pass in the request, a directory to save files to, and the
// maximum POST size we should attempt to handle.
// Here we (rudely) write to the server root and impose 5 Meg limit.
MultipartRequest multi = new MultipartRequest(req, "c:/windows/desktop/mail.txt", 5 * 1024 * 1024);
out.println("<HTML>");
out.println("<HEAD><TITLE>UploadTest</TITLE></HEAD>");
out.println("<BODY>");
out.println("<H1>UploadTest</H1>");
// Print the parameters we received
out.println("<H3>Params:</H3>");
out.println("<PRE>");
Enumeration params = multi.getParameterNames();
while (params.hasMoreElements()) {
String name = (String)params.nextElement();
String value = multi.getParameter(name);
out.println(name + " = " + value);
}
out.println("</PRE>");
// Show which files we received
out.println("<H3>Files:</H3>");
out.println("<PRE>");
Enumeration files = multi.getFileNames();
while (files.hasMoreElements()) {
String name = (String)files.nextElement();
String filename = multi.getFilesystemName(name);
String type = multi.getContentType(name);
File f = multi.getFile(name);
out.println("name: " + name);
out.println("filename: " + filename);
out.println("type: " + type);
if (f != null) {
out.println("length: " + f.length());
}
out.println();
}
out.println("</PRE>");
}
catch (Exception e) {
out.println("<PRE>");
e.printStackTrace(out);
out.println("</PRE>");
}
out.println("</BODY></HTML>");
}
}

hi! chaitanya,
you can try out this code:it works perfectly well
Ist part:
import javax.servlet.http.*;
import com.oreilly.servlet.*;
import java.util.*;
public class T1 extends HttpServlet
{
public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException {
res.setContentType("text/html"); PrintWriter out = res.getWriter(); try{
MultipartRequest multi = new MultipartRequest
(req,"give the real path e.g www/htdocs/document name",5*1024*1024);
out.println("<html>");
out.println("<head><title>UploadTest</head></title>");
out.println("<body>");
out.println("<h1>upLoadTest</h1>");
out.println("<pre>");
Enumeration params = multi.getParameterNames();
while (params.hasMoreElements()){
String name = (String)params.nextElement();
String value = multi.getParameter(name);
out.println( name + " = " + value);
}
out.println("</pre>");
out.println("<h3> files : </h3>");
out.println("<pre>");
Enumeration files = multi.getFileNames();
while (files.hasMoreElements()){
String name = (String)files.nextElement();
String filename = multi.getFilesystemName(name);
String type = multi.getContentType(name);
File f = multi.getFile(name);
out.println("name : " + name);
out.println("file name : "+ filename);
out.println("type : "+type);
if (f!=null){
out.println("length : " +f.length());
out.println();
}
out.println("</pre>");
}
}
catch(Exception e){
out.println("<pre>");
System.out.println(e);
e.printStackTrace(out);
out.println("</pre>");
}
out.println("</body> </html>");
}
}
IInd part :
<html>
<head>
<title>File Upload</title>
</head>
<body bgcolor=bisque>
<form ACTION="http://server-ip address/servlet/T1" METHOD=post ENCTYPE="multipart/form-data" >
which file do you want to upload ? <input type=file name=file><br>
<input type=submit value=submit>
</form>
</body>
</html>