Here you will get example to download file from server using servlet. The file can be of any type like image, pdf, video, music, etc.
How it works?
- First set the content type to application/octet-stream.
- Now set the Content-Disposition header to attachment;filename=fileLocation.
- Read file from the source location using FileInputStream and write to ServletOutputStream to send as response.
Also Read: Upload File to Server Using Servlet Example
Download File From Server Using Servlet Example
WebContent/index.html
This page contains a download link.
<html>
<head>
<title>File Download Example</title>
</head>
<body>
<a href = "download">Click Here To Download</a>
</body>
</html>
src/com/DownloadServlet.java
This is the servlet responsible for downloading the required file.
package com;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/download")
public class DownloadServlet extends HttpServlet{
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String fileLocation = "E:\\video.mp4"; //change the path according to you
File file = new File(fileLocation);
FileInputStream fis = new FileInputStream(file);
ServletOutputStream sos = resp.getOutputStream();
resp.setContentType("application/octet-stream");
resp.setHeader("Content-Disposition", "attachment;filename=" + fileLocation);
byte[] buffer = new byte[4096];
while((fis.read(buffer, 0, 4096)) != -1){
sos.write(buffer, 0, 4096);
}
fis.close();
}
}
Comment below if you have doubts or found any mistake in above servlet download file example.