problem with urldecoder

when i am sending a string from an applet in an urlencoded format the server
is recieving that string but when i am trying to decode that string with
urldecoder it is not decoding that string and it is returning null string.
So my question is will the servlets supports urldecoder function if so please
help me out

u need not use url decoder to decode the string that is automatically done
in the servlet request for parameter.please check ur code whether u are
requesting the correct parameter or not