compare xml through java and present it like a diff tool

I need to write a logic in java that

1. Takes 2 versions of xmls like v1.xml & V2.xml
2. Outputs the differences between the 2 xmls
3. Displays them on a webpage just like any diff tool, like winmerge would display.
   • Removed lines - Highlighted in a unique color
   • Added lines - Highlighted in a unique color
   • Changed lines - Highlighted in a unique color

What is the best way to achieve this.

Thanks !