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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:

  1. HTML File
  2. Servlet File
  3. 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.

NetBeans IDE

Step 2

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

Java Web Application

Step 3

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

ImageApp

Step 4

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

Server and Version Wizard

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>

        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

        <meta name="viewport" content="width=device-width">

    </head>

    <body bgcolor="pink">

    <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>

        <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>

            30

        </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.

Output

Step 9

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

Image Display


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