Using MultiActionController class, you can write multiple actions in into one Action class and removes the creation of multiple action classes.
First create a new Dynamic Web Project and configure it as Maven Project. For Reference, Click Here
Add the following dependencies in pom.xml
<properties>
<spring.version>3.1.0.RELEASE</spring.version>
</properties>
<dependencies>
<!-- Spring 3 dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
1. Controller
Create a class CalculatorController.java that extends MultiActionController class.
CalculatorController.java
package com.kruders.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
public class CalculatorController extends MultiActionController{
public ModelAndView add(HttpServletRequest request,
HttpServletResponse response) throws Exception {
Integer numberA = Integer.parseInt(request.getParameter("numberA").toString());
Integer numberB = Integer.parseInt(request.getParameter("numberB").toString());
Integer result = numberA + numberB;
return new ModelAndView("calculator", "result", result.toString());
}
public ModelAndView subtract(HttpServletRequest request,
HttpServletResponse response) throws Exception {
Integer numberA = Integer.parseInt(request.getParameter("numberA").toString());
Integer numberB = Integer.parseInt(request.getParameter("numberB").toString());
Integer result = numberA - numberB;
return new ModelAndView("calculator", "result", result.toString());
}
public ModelAndView multiply(HttpServletRequest request,
HttpServletResponse response) throws Exception {
Integer numberA = Integer.parseInt(request.getParameter("numberA").toString());
Integer numberB = Integer.parseInt(request.getParameter("numberB").toString());
Integer result = numberA * numberB;
return new ModelAndView("calculator", "result", result.toString());
}
public ModelAndView divide(HttpServletRequest request,
HttpServletResponse response) throws Exception {
Integer numberA = Integer.parseInt(request.getParameter("numberA").toString());
Integer numberB = Integer.parseInt(request.getParameter("numberB").toString());
Integer result = numberA / numberB;
return new ModelAndView("calculator", "result", result.toString());
}
}
2. View
Now create the jsp page index.jsp that delegates requests.
index.jsp
<a href="calculator/add.htm?numberA=10&numberB=5" >Add</a> <a href="calculator/subtract.htm?numberA=10&numberB=5" >Subtract</a> <a href="calculator/multiply.htm?numberA=10&numberB=5" >Multiply</a> <a href="calculator/divide.htm?numberA=10&numberB=5" >Divide</a>
Create jsp folder in WEB-INF and create calculator.jsp file in jsp folder that displays the result based on link clicked in index.jsp
calculator.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Success Page</title>
</head>
<body>
Result : ${result}
</body>
</html>
3. Spring Bean Configuration
Create Spring Bean Configuration in WEB-INF folder and name it dispatcher-servlet.xml and add the following code.
<context:component-scan base-package="com.kruders.controller" /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix"> <value>/WEB-INF/jsp/</value> </property> <property name="suffix"> <value>.jsp</value> </property> </bean>
Here we use BeanNameUrlHandlerMapping to map the request url.
4. Run
Now when you run the project, following screen will be displayed as in Figure 9.1
Figure 9.1
Now when you click on Add link, following screen will be displayed as in Figure 9.2
Figure 9.2
The folder structure of the example is shown below in Figure 9.3
Figure 9.3