How to Display Image Using Servlet in Java

Introduction

This article explains how to display an image using a servlet in Java. The NetBeans IDE is used for the sample example.

Start creating this app

We need to create the following files:

HTML File
Servlet File
XML File

1. HTML File

This file is used to create the user interface where the user clicks on a link to get the image.

2. Servlet File

This file is used to write an image on a browser window.

3. XML file

This file is used to configure the servlet file to the server.

The following is the procedure to create this application.

Step 1

Open the Netbeans IDE.

Step 2

Choose "Java web" -> "web application" as in the following.

Step 3

Type your project named as "ImageApp" as in the following.

Step 4

Select the Java version and the server wizard as in the following.

Step 5

Now delete your default "index.jsp" file and create a new "index.html" file and provide the following code for it.

index.html

<!DOCTYPE html>

<html>

<head>

<title>Image Application</title>

</head>

<center><h1>Click on Below Link to View Your Image</h1>

<a href="ImageServlet">Click Here To View Your Image</a>

</body>

</html>

Step 6

Now create a servlet file named "ImageServlet" and provide the following code for it.

ImageServlet.java

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class ImageServlet extends HttpServlet {

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("image/jpeg");

ServletOutputStream out;

out = response.getOutputStream();

FileInputStream flinp = new FileInputStream("e:\\a.jpg");

BufferedInputStream buffinp = new BufferedInputStream(flinp);

BufferedOutputStream buffoup = new BufferedOutputStream(out);

int ch=0;

while ((ch=buffinp.read()) != -1) {

buffoup.write(ch);

}

buffinp.close();

flinp.close();

buffoup.close();

out.close();

}

Step 7

Now compare your default "web.xml" file with the following code.

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

<servlet-name>ImageServlet</servlet-name>

<servlet-class>ImageServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>ImageServlet</servlet-name>

<url-pattern>/ImageServlet</url-pattern>

</servlet-mapping>

<session-config>

<session-timeout>

</session-timeout>

</session-config>

</web-app>

Step 8

Now your project is ready to run.

Right-click on the project menu then select Run. The following output will be shown.

Step 9

Click on the given link; the following image will be shown there.