how to read a message from com port

i have a gsm modem connect to my pc though a serial porthow can i read the output from modem and use them in my java programmany thanks....
[160 byte] By [majiaa] at [2007-11-27 4:37:53]
# 1
http://java.sun.com/products/javacomm/
hiwaa at 2007-7-12 9:48:13 > top of Java-index,Java Essentials,Java Programming...