Create servlet to serving Download

This tutorial shows how to create a link button on web for "Download". You will need have a servlet on the server side to provide this feature. In the end of this tutorial you will have a download link to download a text file.

Create a servlet

public class DownloadServlet extends HttpServlet {

 

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

    PrintWriter out = response.getWriter();

    // Set the response content type

    response.setContentType("text/plain"); // for text file

 

    response.addHeader("Content-disposition","attachment; filename=yourfilename.txt");

 

    out.print("HELLO");

    out.close();

 

 }

 

}

Register servlet in web.xml

<web-app>

 

   <servlet>

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

      <servlet-class>com.mycompany.DownloadServlet</servlet-class>

   </servlet>

 

<servlet-mapping>

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

      <url-pattern>/download</url-pattern>

   </servlet-mapping>

</web-app>

Create HTML page

<a href="download">Go to download</a>