ssm annotation @ResponseBody returns json garbled problem

Method 1: Add the produces method to @RequestMapping 

    @RequestMapping(value = "/upload.do",method = RequestMethod.POST,produces = "application/json;charset=UTF-8")

This method has limitations and can only work in one method

Method 2: Perform global configuration

1. First of all, we must rely on the jackson package

<dependency>  
    <groupId>org.codehaus.jackson</groupId>  
    <artifactId>jackson-mapper-asl</artifactId>  
    <version>1.9.13</version>  
</dependency>  
<dependency>  
    <groupId>org.codehaus.jackson</groupId>  
    <artifactId>jackson-core-asl</artifactId>  
    <version>1.9.13</version>  
</dependency>

2. Global configuration in springmvc

  <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" >
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>text/plain;charset=utf-8</value>
                            <value>text/html;charset=UTF-8</value>
                        </list>
                    </property>
                </bean>
            </list>
        </property>
    </bean>

    <mvc:annotation-driven/>

The configuration here must be placed in

<mvc:annotation-driven/> above, and the configuration of this mvc must not be less, otherwise an error will be reported