SpringMVC的Ajax提交

$("button:submit").click(function(){
      $.ajax({
        type : ‘POST‘,
        url : ‘${sys_config.root_path}/login.html‘,
        cache:false,
        processData:false,
        contentType:false,
        data : new FormData($(‘#login_form‘)[0]),
        dataType : "json"
      }).done(function(data) {
        if (data.success) {
          //...
        }
      });
      return false;
    });

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- one of the properties available; the maximum file size in bytes -->
        <property name="maxUploadSize" value="10240000"/>
    </bean>

@RequestMapping(value = {"/login"}, method = RequestMethod.POST, produces="application/json;charset=UTF-8")
    @ResponseBody
    public String doLoginPost()
    {
        Map<String, String[]> params = getRequest().getParameterMap();
        ..
    }

<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager" />

    <bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <!-- Turn off working out content type based on URL file extension, should fall back to looking at the Accept headers -->
        <!-- Disabled path extension. Note that favor does not mean use one approach in preference to another, it just enables
        or disables it. The order of checking is always path extension, parameter, Accept header -->
        <property name="favorPathExtension" value="false" />
        <!-- Enable the use of the URL parameter -->
        <property name="favorParameter" value="true" />
        <!-- Don‘t use the JAF, instead specify the media type mappings manually - we only wish to support JSON and XML -->
        <property name="useJaf" value="false"/>
        <property name="defaultContentType" value="text/html" />
        <property name="mediaTypes" >
            <value>
                json=application/json
                xml=application/xml
            </value>
        </property>
    </bean>

    $("button:submit").click(function(){
      $.ajax({
        type : ‘POST‘,
        url : ‘${sys_config.root_path}/login.html‘,
        cache:false,
        data : $(‘#login_form‘).serialize(),//new FormData($(‘#login_form‘)[0]),
        dataType : "json"
      }).done(function(data) {
        //...
      });
      return false;
    });