How to parse the xml file using servlet

Question

My scenario is like this:
<b>FILE-->XI-->J2EE Application</b>
XI sends the xml file to j2ee application. My servlet receives the file in HTTPRequest string. 
How to parse that file using servlets.I should get the xml file as it is and should be displayed in the browser.
Can anyone please help me with code, its urgent.
Please help me!

Answer 1

Download this java code
http://java.sun.com/webservices/jaxp/dist/1.1/docs/tutorial/sax/work/Echo02.java
in your servlet code you can write
public void doPost(req,resp){
DefaultHandler handler = new Echo02();
handler.parse(req.getInputStream());
Offcourse you will need to modify the code of Echo02 class a bit to suit your requirement which would finally retrun you a string and you can then write it using
respose.getWriter().write(responseString);