Java自学之SpringMVC：注解方式

学习目的：与spring类似，使用注解的方式更方便开发工作。本节学习主要是学会使用注解的方式实现Hello Spring MVC。

Part 1

修改controller.IndexController，取消实现的接口，在类名上添加Controller注解，表示该类是一个控制器，并导入org.springframework.stereotype.Controller包。在handleRequest方法上添加RequestMapping("/index")注解，表示路径/index会映射到该方法上。

package 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;
//import org.springframework.web.servlet.mvc.Controller;

@Controller
public class IndexController{

	@RequestMapping("/index")
	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ModelAndView mav = new ModelAndView("index");
        mav.addObject("message", "Hello Spring MVC");
        return mav;
    }    
}

Part 2

修改springmvc-servlet.xml注解，把原本的配置注释掉，新增一句<context:component-scanbase-package="controller"/>配置，表示从包controller下扫描有@Controller注解的类。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    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="controller" />

	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
   		<property name="prefix" value="/WEB-INF/page/" />
  		<property name="suffix" value=".jsp" />
	</bean>
<!-- 	<bean id="simpleUrlHandlerMapping"
		class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
		<property name="mappings">
			<props>
				<prop key="/index">indexController</prop>
				<prop key="/hello">helloController</prop>
			</props>
		</property>
	</bean>
	<bean id="indexController" class="controller.IndexController"></bean>
	<bean id="helloController" class="controller.HelloController"></bean> -->
</beans>

Part 3

运行Tomcat，在浏览器中访问http://localhost:8080/springMVC/index，输出Hello Spring MVC。