Spring MultiActionController using Annotation

Using MultiActionController class, you can write multiple actions in into one Action class and removes the creation of multiple action classes. To configure it, define @RequestMapping with mapping URL above the method name to map that method to the specified URL.

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.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
 
@Controller
public class CalculatorController{
     
    @RequestMapping("/calculator/add.htm")
    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());
    }
     
    @RequestMapping("/calculator/subtract.htm")
    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());
    }
     
    @RequestMapping("/calculator/multiply.htm")
    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());
    }
     
    @RequestMapping("/calculator/divide.htm")
    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 10.1

Figure 10.1