Saturday, 7 June 2014

Servlets : Download file


Click here to watch in Youtube : https://www.youtube.com/watch?v=aofzVypK9gY

Click the below Image to Enlarge
Servlets - Download file
FileDownloadDemo Project Dir Structure
Servlets : Download file

DownloadServlet.java
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DownloadServlet extends HttpServlet
{
    private static final long serialVersionUID = 1L;

    public void init() throws ServletException
    {
        System.out.println("-----------------------------------------");
        System.out.println(" Init method is called in "
                + this.getClass().getName());
        System.out.println("--------------------------------------");
    }

    public void doGet( HttpServletRequest request, HttpServletResponse response )
            throws ServletException, IOException
    {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        String filename = "RamTest.docx";
        String filepath = "D:\\Tomcat\\";
        response.setContentType("APPLICATION/OCTET-STREAM");
        response.setHeader("Content-Disposition", "attachment; filename=\""
                + filename + "\"");

        FileInputStream fileInputStream = new FileInputStream(filepath
                + filename);

        int i;
        while( (i = fileInputStream.read()) != -1 )
        {
            out.write(i);
        }
        fileInputStream.close();
        out.close();
    }

    public void destroy()
    {
        System.out.println("-----------------------------------------");
        System.out.println(" destroy method is called in "
                + this.getClass().getName());
        System.out.println("-----------------------------------------");
    }

}

web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" metadata-complete="true" version="3.0">
  <display-name>FileDownloadDemo</display-name>
  <description>
        This is a simple web application with a source code organization
        based on the recommendations of the Application Developer's Guide.
    </description>
  <servlet>
    <servlet-name>DownloadServlet</servlet-name>
    <servlet-class>DownloadServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>DownloadServlet</servlet-name>
    <url-pattern>/downloadfile</url-pattern>
  </servlet-mapping>
</web-app>

index.html
<html>
<body>
    <a href="downloadfile">Download file</a>
</body>
</html>

Environment Used 

JDK version :1.7.0_51
Tomcat version : 7.0.50 

To Download FileDownloadDemoApp Project Click the below link

https://sites.google.com/site/javaee4321/servlets/FileDownloadDemoApp.zip?attredirects=0&d=1

See also:

  • Servlets Tutorial
  • All Design Patterns Links
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