No converter found for return value of type

淩亂°似流年 2021-09-15 13:04 209阅读 0赞

新搭建个spring+springmvc+mybatis框架，当ajax交互的时候报错，No converter found for return value of type。

前台后台一切正常，最后发现是datetype，json问题。

导入json包，配置。问题解决。

## applicationContext.xml里面的配置：    ##

<mvc:annotation-driven  />
    
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                
                <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>

## 导jackson相关包：    jackson-databind-2.7.4.jar    jackson-annotations-2.7.4.jar    jackson-core-2.7.4.jar    ##

## OK ##