springmvc 返回json格式给客户端的问题

最近学习了springmvc 使用@responseBody注解以son格式返回消息,但是通过http解析器解析，response 返回的是text/html类型

在网上找了好久也没有找到解决的办法

js代码：

function login() {
    $.ajax({
        type : "post",
        contentType : "application/json;charset=UTF-8",
        url : "/springmvc1/user/login",
        data : JSON.stringify({username:$("#username").val(),password:$("#password").val()}),
        success : function(data) {
            if (data == null) {
                return false;
            } else {
                return true;
            } 
        },error: function(){
            alert("error");
        },
        dataType : "json"
    });
}

 springmvc配置：

        <context:component-scan base-package="com.control"></context:component-scan>
        <!--资源包-->
    <mvc:resources location="/js/" mapping="/js/**" />
    <mvc:resources location="/css/" mapping="/css/**" />
    <mvc:resources location="/image/" mapping="/image/**" />
    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true">
            <bean
                class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/plain;charset=UTF-8</value>
                        <value>text/html;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
                         <!--json转换器-->
            <bean
                class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>json/application;charset=UTF-8</value>
                    </list>
                </property>
            
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView">
        </property>
    </bean>

 控制器代码：

  @RequestMapping(value = "/login", method = { RequestMethod.POST,
            RequestMethod.GET })
    public @ResponseBody User Login(@RequestBody User user) {
        user = userServiceImpl.getUser(user.getUsername(), user.getPassword());
        return user;
    }