In
my previous post, I explained an example of SimpleUrlHandlerMapping using xml
based approach. In this post, I am going to rewrite the same example using
annotation based approach.
<bean
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property
name="mappings">
<value>
/hello=helloMsg
/welcome=helloMsg
/*/welcome=helloMsg
</value>
</property>
</bean>
<bean id="helloMsg"
class="com.sample.myApp.controllers.HelloWorldController" />
Above
configurations can be written like below.
@Bean
public
SimpleUrlHandlerMapping simpleUrlHandlerMapping() {
SimpleUrlHandlerMapping
simpleUrlHandlerMapping = new SimpleUrlHandlerMapping();
Map<String, Object> urlMap = new
HashMap<>();
urlMap.put("/hello",
helloMsg());
urlMap.put("/welcome",
helloMsg());
urlMap.put("/*/welcome",
helloMsg());
simpleUrlHandlerMapping.setUrlMap(urlMap);
return simpleUrlHandlerMapping;
}
@Bean
public
HelloWorldController helloMsg() {
return new HelloWorldController();
}
Find
the below working application.
package com.sample.myApp.configs; import java.util.HashMap; import java.util.Map; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping; import com.sample.myApp.controllers.HelloWorldController; @Configuration public class ApplicationConfig { @Bean public SimpleUrlHandlerMapping simpleUrlHandlerMapping() { SimpleUrlHandlerMapping simpleUrlHandlerMapping = new SimpleUrlHandlerMapping(); Map<String, Object> urlMap = new HashMap<>(); urlMap.put("/hello", helloMsg()); urlMap.put("/welcome", helloMsg()); urlMap.put("/*/welcome", helloMsg()); simpleUrlHandlerMapping.setUrlMap(urlMap); return simpleUrlHandlerMapping; } @Bean public HelloWorldController helloMsg() { return new HelloWorldController(); } }
HelloWorldController.java
package com.sample.myApp.controllers; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.AbstractController; public class HelloWorldController extends AbstractController { @Override protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception { ModelAndView modelAndView = new ModelAndView("hello"); modelAndView.addObject("message", "Welcome to Spring MVC framework"); return modelAndView; } }
Create
hello.jsp file under WEB-INF/jsp folder.
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!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>Hello World Spring Web MVC</title> </head> <body> <h2>${message}</h2> </body> </html>
Create
web.xml, HelloWorld-servlet.xml file under WEB-INF folder.
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>Spring MVC Hello WorldApplication</display-name> <servlet> <servlet-name>HelloWorld</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>HelloWorld</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
HelloWorld-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.sample.myApp" /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> </beans>
Create
index.jsp under webapp folder.
<html> <body> <h2>Hello World!</h2> </body> </html>
Total
project structure looks like below.
Run
the application on server and hit any of below urls.
You
will get the message 'Welcome to Spring MVC framework'.
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