Downloading bulk files from filenet repository using content engine API

EngineConnection.java
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import  com.filenet.api.core.*;
import com.filenet.api.util.UserContext;
import javax.security.auth.Subject;

public class EngineConnection {

   
    Connection giveConnection()
    {
    
       
        String url="http://192.168.2.22:9080/wsi/FNCEWS40MTOM";
       
        Connection connection = Factory.Connection.getConnection(url);
       
        Subject subject =UserContext.createSubject(connection, "p8admin", "ecm@dmin1", null);
       
       
        UserContext context=UserContext.get();
       
        context.pushSubject(subject);
       
       
        if(connection!=null)
           
            return connection;
       
        return connection;
       
       
               
    }
   
}

BulkDownloading.java

---------------------------------


import com.filenet.api.collection.ContentElementList;
import com.filenet.api.collection.DocumentSet;
import com.filenet.api.core.*;
import com.filenet.api.util.Id;
import java.util.Iterator;
import java.io.*;
public class BulkDownloading {

    public static void main(String []args)
    {
       
        EngineConnection mine=new EngineConnection();
       
        Connection connection= mine.giveConnection();
       
        if(connection !=null)
        {
            Domain domain=Factory.Domain.fetchInstance(connection, null, null);
           
            ObjectStore object_store=Factory.ObjectStore.fetchInstance(domain, "CMTOS", null);
           
            System.out.println(""+object_store.get_DisplayName());
           
            Folder folder=Factory.Folder.fetchInstance(object_store, "/Practise Folder/Practise Sub Folder", null);
           
            System.out.println(""+folder.get_FolderName());
           
            //get all documents from this folder now
           
            DocumentSet document_set=folder.get_ContainedDocuments();
           
            Document current_document=null;
           
            FileOutputStream output_data=null;
           
            InputStream input_data=null;
           
            Document working_document=null;
           
            ContentElementList content_element_list=null;
           
           Iterator<DocumentSet>doc_iterator= document_set.iterator();
          
           while(doc_iterator.hasNext())
           {
              
               current_document=(Document)doc_iterator.next();
              
               //System.out.println(""+current_document.get_Name()+current_document.get_MimeType());
              
               String mime=current_document.get_MimeType();
               
               if(mime.startsWith("applica"))
               {
                   mime="pdf";
               }
              
               try
               {
                   output_data = new FileOutputStream("d:\\sample\\"+current_document.get_Name()+"."+mime);
                  
                   working_document=Factory.Document.fetchInstance(object_store,current_document.get_Id(), null);
                  
                   content_element_list=working_document.get_ContentElements();
                  
                   //iterate through these
                  
                   Iterator ite=content_element_list.iterator();
                  
                   while(ite.hasNext())
                   {
                      
                       ContentTransfer ct=(ContentTransfer)ite.next();
                      
                       input_data=ct.accessContentStream();
                      
                       int data_length=ct.get_ContentSize().intValue();
                      
                       byte buff[]=new byte[data_length];
                      
                       try
                       {
                          
                           input_data.read(buff);
                          
                           output_data.write(buff);
                          
                       }
                       catch(Exception e)
                       {
                           System.out.println(""+e.getLocalizedMessage());
                       }
                   }
                  
                  
               }
               catch(Exception e)
               {
                   System.out.println(""+e.getLocalizedMessage());
               }
           }
           
            System.out.println("Operation completed");
        }
       
    }
   
}