Following Things have been done 
1.Creatiation of Folders for client storage of document
2.Proper storage of documents in C:\\Proj folder by creation of dirs for
user_id,document_id etc as discussed
3.The servlet page has been change with change in files 
1.Storage Service.java
2.Creation of Pdfstorage.java
3.Changes made in xmlcreator.java,pdfreaderparser.java,xmltohashmap.java