Json-Spring :No converter found

最近配置新的Spring-SpringMvc-MyBatis项目时,测试从controller到数据库都是成功的,唯独回传到页面的时候

报错

提示

No converter found for return value of type: class java.util.HashMap

原因是没有注册JSon转换,@ResponseBody时无法根据转换器进行转换

只要在applicationContext.xml中配置一下即可

<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>   

需要jackson的jar包

maven依赖如下
可以配置在pom.xml中,也可以在中心仓库下载手动导入

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.7.4</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.7.4</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.7.4</version>
</dependency>