Json数据的处理

1.引入依赖（依赖的版本相适应）

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!--spring-webMvc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.14.RELEASE</version>
    </dependency>

    <!-- spring-web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.14.RELEASE</version>
    </dependency>


    <!-- javax.servlet-api -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.7.0</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.7.0</version>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.7.0</version>
    </dependency>

  </dependencies>

2.配置文件中的内容

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           https://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://www.springframework.org/schema/mvc
           http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--配置的jackson文件-->
    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
        </mvc:message-converters>
    </mvc:annotation-driven>

    <mvc:default-servlet-handler/>

    <context:component-scan base-package="org.example.springmvc.controller"/>
    <!--配置视图解析器 默认的试图解析器-->
    <bean id="defaultViewResolver"
          class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="contentType" value="text/html"/>
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

3.关于@Responsebody和@Requestbody的用法

@Controller
public class BodyController {
    @RequestMapping("qwer")
    //代表响应数据为jasion数据
    @ResponseBody
    public Reigster reigster(){
        Reigster reigster=new Reigster();
        reigster.setId(10);
        reigster.setName("admin");
        reigster.setPwd("123456");
        return reigster;
   }

    @RequestMapping("qwer02")
    public @ResponseBody Reigster reigster02(){
        Reigster reigster=new Reigster();
        reigster.setId(10);
        reigster.setName("admin");
        reigster.setPwd("123456");
        return reigster;
    }

    @RequestMapping("qwer03")
    @ResponseBody
    public List<Reigster> reigster03(){
        List<Reigster> list=new ArrayList();
        Reigster reigster1=new Reigster();
        reigster1.setId(10);
        reigster1.setName("admin");
        reigster1.setPwd("123456");
        Reigster reigster2=new Reigster();
        reigster2.setId(11);
        reigster2.setName("admin");
        reigster2.setPwd("123");
        list.add(reigster1);
        list.add(reigster2);
        return list;
    }

    //返回的是一个对象，前端进行请求
    @RequestMapping("qqq")
    @ResponseBody
    public Reigster reigster04(@RequestBody Reigster reigster){
        return reigster;
    }
}