how can an ASCII coded text file covert to alphanumeric characters?

how can an ASCII coded data which are in a text file convert in to a alphanumeric characters? when converted, the alphanumeric characters can be read in a java based web site! can you pls give me an example? pls......!!!!!!!!!
[240 byte] By [java08a] at [2007-10-2 3:51:59]
# 1
Please elaborate on what you mean by 'ASCII coded data' and what you mean by 'alphanumeric characters' . If the file contained the bytes 0x31,0x32,0x33,0x34 which are the ASCII bytes for 1234 are you expecting to get 1234?
sabre150a at 2007-7-15 23:08:14 > top of Java-index,Other Topics,Algorithms...