You need the following jars

jawk.jar
regex12.jar

Write a batch file as follows

set pattern1="abc"
set pattern2="xyz"
set tempfile=c:\temp.txt

dir /b /s c:\dir\*.jsp 
| java com.ai.jawk.CmdSubst @call gres.bat $1 %pattern1% %pattern2% %tempfile% 
> execjsp.bat

@call execjsp.bat

This is what it does

1. List all jsp files in that directory hierarchy
2. For each line execute "gres.bat" with 4 arguments
3. gres.bat replaces patter1 with pattern2 in file $1 which is the first argument from the previous pipe. It uses a tempfile in the process
4. All the executable commands are collected in "execjsp.bat"
5. As a final step execute the command
6. You will have an entire directory/sub-directory worth of files replaced with the pattern