spring mvc不能將返回的map自動轉換爲json, 報406錯誤

1.在 spring mvc 配置文件 如：  dispatcher-servlet.xml 中加入:

 

<bean   class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">

       <property name="messageConverters">

           <list>

              <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>

           </list>

       </property>

</bean>

 

<mvc:annotation-driven />

加入的類要放在<mvc:annotation-driven />以前。

 

2. 在pom 文件中加入相應的依賴

 

   

    <dependency>

    <groupId>com.fasterxml.jackson.core</groupId>

    <artifactId>jackson-core</artifactId>

    <version>2.5.2</version>

    </dependency>

   

    <dependency>

    <groupId>com.fasterxml.jackson.core</groupId>

    <artifactId>jackson-databind</artifactId>

    <version>2.4.4</version>

</dependency>

 

<dependency>

    <groupId>com.fasterxml.jackson.core</groupId>

    <artifactId>jackson-annotations</artifactId>

    <version>2.4.3</version>

</dependency>

 

3. 測試類

@RequestMapping(value="/firstTime",method=RequestMethod.POST,produces=MediaType.APPLICATION_JSON_UTF8_VALUE)

    public Map<String, Object> firstTime(HttpServletRequest request){

       logger.debug("requestBody:{}" + request.getAttribute(VerificationService.ATTRIBUTE_KEY));

       UserGame userGame = new DataInRequest().getModel(request, UserGame.class);

       //更新任務時長和移動次數

       userGame.setFinishNumber(1L);                 //設置完成遊戲數爲1，在查看文檔的時候回查看該數

       jdbcService.saveOrUpdate(userGame);

       //返回id

       Map<String, Object> resultMap = new RespondHead().getRespondHeadMap();

       resultMap.put("id", userGame.getId());

       return resultMap;

 

    }

 

返回的map 就會自動轉換爲json