spring3 mvc　注解,该怎么解决

<?xml version="1.0" encoding="UTF-8"?><web-app>    <servlet-mapping>        <servlet-name>default</servlet-name>        <url-pattern>*.jpg</url-pattern>    </servlet-mapping>    <servlet-mapping>        <servlet-name>default</servlet-name>        <url-pattern>*.png</url-pattern>    </servlet-mapping>    <servlet-mapping>        <servlet-name>default</servlet-name>        <url-pattern>*.gif</url-pattern>    </servlet-mapping>    <servlet-mapping>        <servlet-name>default</servlet-name>        <url-pattern>*.js</url-pattern>    </servlet-mapping>    <servlet-mapping>        <servlet-name>default</servlet-name>        <url-pattern>*.css</url-pattern>    </servlet-mapping>    <servlet>        <servlet-name>spring</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>spring</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping>    <welcome-file-list>        <welcome-file>login.jsp</welcome-file>    </welcome-file-list></web-app>

<?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:mvc="http://www.springframework.org/schema/mvc"       xmlns:p="http://www.springframework.org/schema/p"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       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            http://www.springframework.org/schema/aop             http://www.springframework.org/schema/aop/spring-aop-3.0.xsd            http://www.springframework.org/schema/tx             http://www.springframework.org/schema/tx/spring-tx-3.0.xsd            http://www.springframework.org/schema/mvc             http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd            http://www.springframework.org/schema/context             http://www.springframework.org/schema/context/spring-context-3.0.xsd">    <!-- 自动扫描的包名 -->    <context:component-scan base-package="cn.spring.app.controller" />     <!-- 默认的注解映射的支持 -->    <mvc:annotation-driven />    <!-- 视图解释类 -->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="prefix" value="/WEB-INF/jsp/" />        <property name="suffix" value=".jsp" />        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />    </bean>    <!-- 拦截器 -->    <!-- 对静态资源文件的访问  -->    <mvc:default-servlet-handler /></beans>

package cn.spring.app.controller;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;@Controllerpublic class LoginController {     @RequestMapping(value="/login",method=RequestMethod.GET)    public String login(){        return "login";    }    @RequestMapping(value="/login",method=RequestMethod.POST)    public String login2(HttpServletRequest request){        String username=request.getParameter("username").trim();        System.out.println(username);        return "success";    }}