Example of downloading file from the server in servlet

For downloading a file from the server, here is the simple example. I am supposing you have home.jsp file in E drive that you want to download. If there is any jar or zip file, you can direct provide a link to that file. So there is no need to write the program to download. But if there is any java file or jsp file etc, you need to create a program to download that file.

Example of downloading file from the server in servlet

In this example, we are creating three files:

index.html
DownloadServlet.java
web.xml

index.html

This file provides a link to download the file.

DownloadServlet.java

This is the servlet file that reads the content of the file and writes it into the stream to send as a response. For this purpose, we need to inform the server, so we are setting the content type as APPLICATION/OCTET-STREAM .

import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;

public class DownloadServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();
String filename = "home.jsp"; 
String filepath = "e:\\"; 
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(); 
}

}

web.xml file

This configuration file provides informations to the server about the servlet.

<web-app>

<servlet>
<servlet-name>DownloadServlet</servlet-name>
<servlet-class>DownloadServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>DownloadServlet</servlet-name>
<url-pattern>/servlet/DownloadServlet</url-pattern>
</servlet-mapping>

</web-app>

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