How to read the contents in a file which is of input type file

I have a jsp page wherein i have to passs the file as input and read the contentsn of a file in servlet.

upload.jsp

<FORM METHOD=POST ENCTYPE="multipart/form-data" ACTION="upload"> File to upload: <INPUT TYPE=FILE NAME="upfile"><BR> <INPUT TYPE=SUBMIT VALUE="Submit">

upload.java

//In this servlet page i have tried to read the contents of a file in doPost method. I have used

String t1=request.getParameter("upfile");

//It shows null. How to read the content in a file and display in servlet?

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