Parameters with Ajax in JSP-Servlet

Create Maven Project

On the Eclipse, create a Maven project

Click Next button to select Workspace Location for project

Click Next button to select Archetype for project

Click Next button and enter Project Information:

• Group Id: LearnJSPServletWithRealApps
• Artifact Id: LearnJSPServletWithRealApps
• Package: com.demo

Click Finish button to finish create Maven project

Configure pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>LearnJSPServletWithRealApps</groupId>
	<artifactId>LearnJSPServletWithRealApps</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>Learn JSP-Servlet with Real Apps</name>
	<url>http://maven.apache.org</url>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>javax.servlet.jsp.jstl</groupId>
			<artifactId>javax.servlet.jsp.jstl-api</artifactId>
			<version>1.2.1</version>
		</dependency>
		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.1.0</version>
			<scope>provided</scope>
		</dependency>
	</dependencies>
	<build>
		<finalName>LearnJSPServletWithRealApps</finalName>
	</build>
</project>

Configure web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
 	<welcome-file-list>
 		<welcome-file>index.jsp</welcome-file>
 	</welcome-file-list>
</web-app>

Redirect Page

Create new JSP file named index.jsp in src\main\webapp folder.

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1" isELIgnored="false"%>
<jsp:forward page="demo"></jsp:forward>

Create Servlets

Create new package named com.demo.servlets. In this package, create new Servlets as below:

Demo Servlet

In com.demo.servlets package, create new Servlet named DemoServlet as below:

package com.demo.servlets;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/demo")
public class DemoServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public DemoServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.getRequestDispatcher("demo/index.jsp").forward(request, response);
	}

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

}

Ajax Servlet

In com.demo.servlets package, create new Servlet named AjaxServlet as below:

package com.demo.servlets;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/ajax")
public class AjaxServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public AjaxServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		int number1 = Integer.parseInt(request.getParameter("number1"));
		int number2 = Integer.parseInt(request.getParameter("number2"));
		PrintWriter out = response.getWriter();
		out.print(String.valueOf(number1 + number2));
		out.flush();
		out.close();
	}

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

}

Create JSP Pages

Create new folder named demo in src\main\webapp folder. In this folder, create new JSP files as below:

Index Page

In src\main\webapp\demo folder, create new JSP file named index.jsp as below:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1" isELIgnored="false"%>
<html>
<head>
<title>Ajax</title>
<script src="${pageContext.request.contextPath }/assets/js/jquery.js"></script>
<script type="text/javascript">
	$(document).ready(function() {

		$('#buttonSum').click(function() {
			var number1 = $('#number1').val();
			var number2 = $('#number2').val();
			$.ajax({
				type : 'GET',
				data: { number1: number1, number2: number2 },
				url : '${pageContext.request.contextPath }/ajax',
				success : function(result) {
					$('#result').html(result);
				}
			});
		});

	});
</script>
</head>
<body>

	<h3>Multiple Parameters in Ajax</h3>
	<form>
		Number 1 <input type="text" id="number1" />
		<br>
		Number 2 <input type="text" id="number2" />
		<br>
		<input type="button" value="Sum" id="buttonSum">
		<br>
		Result: <span id="result"></span>
	</form>

</body>
</html>

Structure of Maven Project

Run Application

Select project, right click and select Run As/Run on Server menu

Access DemoServlet with following urls as below:

• http://localhost:8081/LearnJSPServletWithRealApps
• http://localhost:8081/LearnJSPServletWithRealApps/demo

Output

Click Sum button:

Output