Spring MVC入门级实例-基于注解

基于注解的 Spring MVC与基于xml的配置(参考Spring MVC入门级实例-基于xml的配置)大部分都一样,下面来比较一下

 

1.web.xml 与基于xml的配置一样

 

2.springMVC-servlet.xml与基于xml的配置一样

 

3.applicationContext.xml配置如下

    <!-- 启动注解驱动的Spring MVC功能，注册请求url和注解POJO类方法的映射-->
     <mvc:annotation-driven />
        
     <!-- 启动包扫描功能，以便注册带有@Controller、@Service、@repository、@Component等注解的类成为spring的bean -->
     <context:component-scan base-package="com.ldh.mvc"/>
      
      <!--通过url中的method参数指定要执行的controller方法-->
       <bean id="methodNameResolver"
		class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
		<property name="paramName">
			<value>method</value>
		</property>
		<property name="defaultMethodName">
			<value>view</value>
		</property>
	</bean>

 

可以看到这里启动了"context:component-scan"配置,去掉了url与controller的映射关系,因为url与controller的映射关系会在注解里指定

 

4.controller文件

 

@org.springframework.stereotype.Controller
@RequestMapping("/index.html")
public class IndexController implements Controller{
	
	@RequestMapping
	public ModelAndView handleRequest(HttpServletRequest arg0,
			HttpServletResponse arg1) throws Exception {
		System.out.println("Hello index=================");
		Map<String,String> resultMap = new HashMap<String,String>();
		resultMap.put("message", "欢迎来到首页");
		return new ModelAndView("/index", resultMap);
	}
}

 

   方法上的RequestMapping注解一定要指定,不要找不到要执行的controller方法

 

@Controller
@RequestMapping("/user/operation.html")
public class InternalPathController extends MultiActionController{
	
	@RequestMapping(params="method=update")
	public ModelAndView update(HttpServletRequest request, HttpServletResponse response) throws Exception {
		Map<String,String> resultMap = new HashMap<String,String>();
		resultMap.put("message", "消息更新成功");
		return new ModelAndView("/page/update", resultMap);
	}
	
	@RequestMapping(params="method=delete")
	public ModelAndView delete(HttpServletRequest request, HttpServletResponse response) throws Exception {
		Map<String,String> resultMap = new HashMap<String,String>();
		resultMap.put("message", "消息删除成功");
		return new ModelAndView("/page/delete", resultMap);
	}
}

 
5.访问路径通与基于xml的配置一样