File download using smart gwt

Smart file upload and download is very easy in comparison of gwt and gwt-ext.

Client side 


 Canvas canvas = new Canvas();
            canvas.setSize("355px", "280px");
            
    final DynamicForm uploadForm = new DynamicForm();

    uploadForm.setEncoding(Encoding.MULTIPART);
        UploadItem fileItem = new UploadItem("image");
        TextItem nameItem = new TextItem("imageName");
        TextItem descriptionItem = new TextItem("description");
        HiddenItem spaceImageIdItem = new HiddenItem("spaceImageId");
        HiddenItem propertyIdItem = new HiddenItem("propertyId");
        propertyIdItem.setValue(23);
        spaceImageIdItem.setValue(0);
           
 canvas.addChild(uploadForm);
           uploadForm.moveTo(6, 109);
           
           
           uploadForm.setAction("/XmlServlet1");
           IButton uploadButton = new IButton("Download");
           canvas.addChild(uploadButton);
           uploadButton.moveTo(218, 156);
           uploadButton.addClickHandler(new com.smartgwt.client.widgets.events.ClickHandler(){
               



               @Override
               public void onClick(ClickEvent event) {
                   
                   uploadForm.submitForm();
                   
               }
           });
            layout.addMember(canvas);


Server side code same as gwt ext xml servlet .java file.



xmlServlet1.java 
package com.server;



import java.io.*;


import java.sql.*;
import java.util.*;
import java.text.*;
import java.util.regex.*;

import org.mortbay.jetty.Response;

import javax.servlet.*;
import javax.servlet.http.*;

import java.io.*; 
import java.sql.*; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.ServletInputStream.*; 
import java.io.PrintWriter; 

public class XmlServlet1 extends HttpServlet { 

public void doPost(HttpServletRequest req,HttpServletResponse res) 
{
    File uploadedFile;

  
    System.out.print("on server");
try{
   
 // String filename =

    File uploadedFile1=new File("./img/"+"happybir.jpg" );

   


  String kk=uploadedFile1.getAbsolutePath();

  System.out.print(kk);

    File f=new File(kk);

    //System.out.println("foder is " + folder);
    res.setContentType("application/octet-stream");
    res.setHeader("Content-disposition", "attachment;filename=\"" +"happybir.jpg" + "\"");
    //res.setHeader("Content-Disposition","attachment; filename=;");
    ServletOutputStream stream = res.getOutputStream();
    BufferedInputStream fif = new BufferedInputStream(new FileInputStream(f));
    int data;
    while((data = fif.read()) != -1) {
    stream.write(data);
    }
    fif.close();
    stream.close();

}catch(Exception e) 
{ 
System.out.println("Exception Due to"+e); 
e.printStackTrace(); 
} 
} 
}