为什么会有这篇文章，因为在处理过程中发现springmvc不能处理json，这不可能啊，所以写了下，发现以前没有重视@RequestBody。

• 注： 注意键值对和json的区别：
  JSON:

{"username":"zhangsan"}

键值对：

Paste_Image.png

Controller

import com.zhb.entity.Account;
import com.zhb.entity.User;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by jarvan4dev on 16/2/25.
 */
@RestController
public class IndexController {

    @RequestMapping("/user")
    public Account getUser(@RequestBody User user){
        return new Account(1,user.getUsername(),"6227001376550927913", 10000.0);
    }
}

实体类

import lombok.Data;

/**
 * Created by jarvan4dev on 16/2/25.
 */
@Data //@Data-请参看我的lombok介绍
public class User {
    private int id;
    private String username;
    private String password;
}


import lombok.AllArgsConstructor;
import lombok.Data;
/**
 * Created by jarvan4dev on 16/2/25.
 */
@Data
@AllArgsConstructor
public class Account {

    private int id;
    private String username;
    private String cardNo;
    private double balance;
}

pom.xml

<dependencies>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context-support</artifactId>
          <version>4.2.0.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>4.2.0.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-aspects</artifactId>
          <version>4.2.0.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>org.aspectj</groupId>
          <artifactId>aspectjweaver</artifactId>
          <version>1.8.6</version>
      </dependency>
      <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>1.16.6</version>
      </dependency>
      <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>fastjson</artifactId>
          <version>1.2.7</version>
      </dependency>
      <dependency>
          <groupId>commons-fileupload</groupId>
          <artifactId>commons-fileupload</artifactId>
          <version>1.3.1</version>
      </dependency>
      <dependency>
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
          <version>1.2.17</version>
      </dependency>
  </dependencies>

spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 http://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">

    <context:component-scan base-package="com.zhb.controller" />

    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="UTF-8" />
            </bean>
            <bean
                    class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <property name="features">
                    <array value-type="com.alibaba.fastjson.serializer.SerializerFeature">
                        <value>NotWriteDefaultValue</value>
                        <value>DisableCircularReferenceDetect</value>
                    </array>
                </property>
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json;charset=UTF-8</value>
                        <value>text/html;charset=UTF-8</value>
                        <value>text/plain;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UTF-8"/>
        <property name="maxUploadSize" value="540000"/>
    </bean>
</beans>

web.xml

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>Archetype Created Web Application</display-name>
    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

使用curl测试：

curl localhost:8080/sp/user -d '{"id":1,"username":"zhangsan","password":"123"}' -H "Content-type: application/json" 

• 注意： 为了让springmvc处理json，需要在Controller的参数中加入 @RequestBody注解，
  如：

... getUser(@RequestBody User user){...}