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>
