I need a script to read a particular table from given URL and copy the text and paste it in a layer in photoshop

if your on a Mac, you can call terminal commands through the app.system call.  example: app.system("curl http://www.example.com > ~/Desktop/url.txt");

Then, declare that txt file, open it in the script and do what is needed by finding whatever text you need.  instanceof method is a good way of chopping through the text after loading it. 

Can't help ya on a windows pc, sorry.