springmvc接口接收json类型参数设置

Springmvc需要如下配置：

1.开启注解

<!-- 开启注解-->  
 <mvc:annotation-driven />  

2.加入相关bean

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">  
    <property name="messageConverters">  
        <list>  
            <ref bean="jsonHttpMessageConverter" />  
        </list>  
    </property>  
</bean>  
  
<bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">  
    <property name="supportedMediaTypes">  
        <list>  
            <value>application/json;charset=UTF-8</value>  
        </list>  
    </property>  
</bean>  

3.maven加入jackson依赖

   <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>2.5.2</version>  
</dependency>  

4.controller层入参要加注解@RequestBody

必须是个类啊啊啊啊，不能用HttpServletRequest了，它不是个json

@RequestBody 接受对象里面,如果已经有了非空构造函数，那么它同时必须要有默认的空构造函数，注意这个构造函数一定要为空