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，同事是可以返回JSON的。有哪位大神遇到请帮我看下。