SpringMVC的Ajax提交

这种类型的提交, 必须配合 multipartResolver,

$("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;
    });

需要在Spring配置文件中使用, 没有这个的话, request中的parametersMap是空的

    <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>

在dependency中要添加commons-fileupload.

在Controller中, 使用正常的方式即可

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

另外在Spring的配置中还需要注意添加 content-negotiation-manager, 没有这个的话, 使用produces="application/json"会出406错误. 其中关键的一个参数是favorPathExtension, 这个必须为false, 另外ignoreAcceptHeader这个参数不能加, 加上也会导致406.

<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>

对于普通的提交, 使用这种方式即可, 不需要multipartResolver

    $("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;
    });

favorPathExtension