Example of downloading file from the server in servlet

by Online Tutorials Library July 14, 2022

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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