springMVC的配置，请大神们看看，有没有哪里有问题，我用Model做返回类型的时候总是映射到URL

项目结构

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>xnb_web_api</display-name>

    <context-param>
		<param-name>webAppRootKey</param-name>
		<param-value>
			xnb_web_api.root
		</param-value>
	  </context-param> 

	  <welcome-file-list>
	     <welcome-file>/index.jsp</welcome-file>
	  </welcome-file-list>

	<!--********************************** log4j配置       ********************************** -->
	  <context-param>
	    <param-name>log4jConfigLocation</param-name>
	    <param-value>classpath:config/log4j.properties</param-value>
	  </context-param>
	  <context-param>
	    <param-name>log4jRefreshInterval</param-name>
	    <param-value>6000</param-value>
	  </context-param>
	  <listener>
	      <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
	  </listener>
	<!--********************************** log4j配置   ********************************** -->    

	 <!--********************************** spring配置   ********************************** -->
	  <context-param>
	    <param-name>contextConfigLocation</param-name>
	    <param-value>classpath:config/springConfig/*.xml</param-value>
	  </context-param>
	  <listener>
	    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	  </listener>

	  <servlet>
	    <servlet-name>xnb_web_api</servlet-name>
	    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	    <init-param>
	      <param-name>contextConfigLocation</param-name>
	      <param-value>classpath:config/project-servlet.xml</param-value>
	    </init-param>
	    <init-param>
	      <param-name>encoding</param-name>
	      <param-value>UTF-8</param-value>
	    </init-param>
	    <load-on-startup>1</load-on-startup>
	  </servlet>
	  <servlet-mapping>
	    <servlet-name>xnb_web_api</servlet-name>
	    <url-pattern>/</url-pattern>
	  </servlet-mapping>
	<!--********************************** spring配置   ********************************** --> 

	<!-- **********************************  字符集过滤     ********************************************************* -->
	  <filter>
	    <filter-name>Set Character Encoding</filter-name>
	    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
	    <init-param>
	      <param-name>encoding</param-name>
	      <param-value>UTF-8</param-value>
	    </init-param>
	    <init-param>
		  <param-name>forceEncoding</param-name>
		  <param-value>true</param-value>
		</init-param>
	  </filter>
	  <filter-mapping>
	    <filter-name>Set Character Encoding</filter-name>
	    <url-pattern>/*</url-pattern>
	  </filter-mapping>
	<!-- **********************************  字符集过滤     ********************************************************* -->
	<!-- **********************************过滤器配置 **********************************-->
  	<filter>
  		<filter-name>loginCheck</filter-name>
  		<filter-class>com.moensun.xnbwebapi.filter.SessionCheck</filter-class>
  	</filter>
  	<filter-mapping>
  		<filter-name>loginCheck</filter-name>
  		<url-pattern>/*</url-pattern>
  	</filter-mapping>
   <!-- **********************************过滤器配置 **********************************-->
</web-app>

project-servlet.xml

<?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:p="http://www.springframework.org/schema/p"
	       xmlns:context="http://www.springframework.org/schema/context"
	       xmlns:mvc="http://www.springframework.org/schema/mvc"
	  	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
						       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
						       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
						       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
						       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
	  <context:annotation-config />
	  <mvc:annotation-driven />
<!-- ************************  把标记了@Controller注解的类转换为bean ************************ -->
      <context:component-scan base-package="com.moensun.xnbwebapi.controller">

      </context:component-scan>
<!-- ************************  把标记了@Controller注解的类转换为bean ************************ -->
      <mvc:resources mapping="/resources/**" location="/resources/"/> <!-- 静态文件 -->

 <!--*****************************************    中文乱码解决 以UTF8输出              *****************************************-->
	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
	    <property name="messageConverters">
	        <list>
	            <ref bean="jsonHttpMessageConverter" />
	            <ref bean="stringHttpMessageConverter" />
	        </list>
	    </property>
	</bean>

	<!-- json -->
	<bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
		<property name="supportedMediaTypes" value="application/json" />
		<property name="objectMapper" ref="jacksonObjectMapper" />
	</bean>
	<bean id="jacksonObjectMapper" class="com.fasterxml.jackson.databind.ObjectMapper" />
	<bean id="jacksonSerializationConfig" class="com.fasterxml.jackson.databind.SerializationConfig" factory-bean="jacksonObjectMapper" factory-method="getSerializationConfig" />

	<!-- json -->
	<!-- string -->
	<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
		<property name="supportedMediaTypes">
			<list>
		      	<value>text/plain;charset=UTF-8</value>
		        <value>text/html;charset=UTF-8</value>
		        <value>application/json;charset=UTF-8</value>
			</list>
		</property>
	</bean>
	<!-- string -->
<!--*****************************************    中文乱码解决 以UTF8输出              *****************************************-->

<!-- *****************************   配置视图解释器    ***************************** -->
	<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
		<property name="mediaTypes">
		  <map>
		    <entry key="html" value="text/html"/>
		    <entry key="xml" value="text/xml"/>
		    <entry key="json" value="application/json"/>
		  </map>
		</property>
		<property name="defaultViews">
	    	<list>
	        	<bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView" />
	   		</list>
	    </property>
		<property name="viewResolvers">
		  <list>
		    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		      <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
		      <property name="prefix" value="/WEB-INF/views/"/>
		      <property name="suffix" value=".jsp"/>
		    </bean>
		  </list>
		</property>
	</bean>
<!-- *****************************   配置视图解释器    ***************************** -->  

</beans>						       

applicationContext.xml

<?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:tx="http://www.springframework.org/schema/tx"
		xmlns:context="http://www.springframework.org/schema/context"
		xmlns:aop="http://www.springframework.org/schema/aop"
		xmlns:mongo="http://www.springframework.org/schema/data/mongo"
		xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
		                    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-34.0.xsd
		                    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
		                    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
		                    http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop.xsd
		                   http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd">

	  <mvc:annotation-driven/>

      <context:component-scan base-package="com.moensun.xnbwebapi"></context:component-scan>  

<!--********************************************************    载入外部文件       ******************************************************** -->
	  <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
			<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
  			<property name="ignoreResourceNotFound" value="true" />
  			<property name="ignoreUnresolvablePlaceholders" value="true" />
			<property name="locations">
				<list>
					<value>classpath:config/dbConfig/db.properties</value>
				</list>
			</property>
	 </bean>
<!--********************************************************    载入外部文件       ******************************************************** -->

</beans>		                    

配置如上 ，代码如下

@Controller
@RequestMapping(value="user/")
public class UserController {
	@RequestMapping(value="login")
	public @ResponseBody  Model login(final Model model){
		model.addAttribute("1","2");
		return model;
	}
}

用Model这种返回方式，总是映射到URL上，我不知道哪里出了问题，同时是可以返回JSON的。有哪位大神遇到请帮我看下。