Step-1: Load Spring Servlet Context
First of all we have to declare the servlet of Spring that acts as a Front Controller. Besides we have to declare the URLs served by the DispatcherServlet.
web.xml
<web-app version="2.4" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/j2ee" xsi:schemalocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>SpringMVCExample</display-name> <servlet> <servlet-name>SpringMVCExample</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring/spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>SpringMVCExample</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> </web-app>
Step-2: Create Controller class
In the following code there's a simple controller FirstController. The annotations involved in this class are:
- @Controller : tells Spring that this class is a Controller
- @RequestMapping on the class level means the controller serves the requests sent to this path: protocol://hostname:<port>/<context>/firstcontroller/
- @RequestMapping on the method level means that the method serves the requests sent to this path: protocol://hostname:<port>/<context>/firstcontroller/method1
FirstController.java
package com.simonefolinojavablog.spring.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller @RequestMapping(value="/firstcontroller") public class FirstController { @RequestMapping("/method1") public String processRequestMethod1(){ System.out.println("processRequestMethod1"); return "example"; } @RequestMapping("/method2") public String processRequestMethod2(){ System.out.println("processRequestMethod2"); return "example"; } }
Step-3: Spring Context Configuration
In the web.xml we have specified spring-mvc.xml as the configuration file. In spring-mvc.xml we specify that we are going to use annotation support and the package to search for annotation as @Service,@Controller etc...
- <context:annotation-config>:support to annotations
- <context:component-scan base-package="com.simonefolinojavablog.spring.controller">: search the annotations as @Service, @Controller
- InternalResourceViewResolver: special bean that makes possible to refer to Views using simply the name of JSP
spring-mvc.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd "> <context:annotation-config /> <context:component-scan base-package="com.simonefolinojavablog.spring.controller" /> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/pages/" /> <property name="suffix" value=".jsp" /> </bean> </beans>
Step-4: Create a JSP to redirect the web flow
The method of the FirstController returns example that is the name of the JSP to put in the directory WEB-INF/pages/example.jsp
example.jsp
<html> <head> <title>Landing Page</title> </head> <body>Hi, your first controller works fine! </body> </html>
Step-5: Client
Now we have to call the web application at the link http://localhost/${context}/firstcontrollert/method1.htm or http://localhost/${context}/firstcontrollert/method2.htm.The controller redirects the web flow to example.jsp and you can see processRequestMethod1 or processRequestMethod2 in the console, depending on which method has served the request.
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