Question

springmvc jackon 为什么不返回json

Answer 1

SpringMvc配置：

<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <!--json转换器-->
            <ref bean="mappingJacksonHttpMessageConverter" />
        </list>
    </property>
</bean>

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">  
    <property name="messageConverters">  
        <list>  
               <ref bean="mappingJacksonHttpMessageConverter" />  
        </list>  
    </property>  
</bean>  
        
<bean id="mappingJacksonHttpMessageConverter"  
    class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">  
     <property name = "supportedMediaTypes">  
          <list>  
            <bean class="org.springframework.http.MediaType">  
             <constructor-arg index="0" value="text"/>  
             <constructor-arg index="1" value="plain"/>  
             <constructor-arg index="2" value="UTF-8"/>  
            </bean>  
            <bean class="org.springframework.http.MediaType">  
             <constructor-arg index="0" value="*"/>  
             <constructor-arg index="1" value="*"/>  
             <constructor-arg index="2" value="UTF-8"/>  
            </bean>  
            <bean class="org.springframework.http.MediaType">  
             <constructor-arg index="0" value="text"/>  
             <constructor-arg index="1" value="*"/>  
             <constructor-arg index="2" value="UTF-8"/>  
            </bean>  
             <bean class="org.springframework.http.MediaType">  
             <constructor-arg index="0" value="application"/>  
             <constructor-arg index="1" value="json"/>  
             <constructor-arg index="2" value="UTF-8"/>  
            </bean>  
          </list>  
    </property>  
</bean>

Controller代码

@RequestMapping(value="update",method=RequestMethod.POST)
@ResponseBody
public Map<String,Object> update(SOUser entity,MultipartHttpServletRequest request){
    Long userId = entity.getId();
    Long uid = TokenManager.getUserId();
    if(StringUtils.isBlank(userId,uid) || !uid.equals(userId)){
        resultMap.put("status", 500);
        resultMap.put("message", "非法修改！");
    }else{
        String name = "portrait/" + userId;
        String portrait = ImageManager.saveImages(name, request);
        if(StringUtils.isNotBlank(portrait)){
            entity.setPortrait(portrait);
        }
        userService.updateByPrimaryKeySelective(entity);
        resultMap.put("status", 200);
        resultMap.put("message", "修改成功！");
        entity = userService.selectByPrimaryKey(userId);
        //更新
        TokenManager.login(entity);
    }
    return resultMap;
}