SpringMVC @RequestBody的使用解析

<?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:p="http://www.springframework.org/schema/p" xmlns:mvc="http://www.springframework.org/schema/mvc"
 xmlns:task="http://www.springframework.org/schema/task"
 xsi:schemaLocation="http://www.springframework.org/schema/context    
          http://www.springframework.org/schema/context/spring-context-4.0.xsd    
          http://www.springframework.org/schema/beans    
          http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
          http://www.springframework.org/schema/mvc
          http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd">
          <!-- 扫描包注解 -->
 <context:component-scan base-package="xxxx"></context:component-scan>
 <!-- mvc注解功能启动 -->
 <mvc:annotation-driven />
</beans>

@Controller
public class TestController {
 // url请求拦截
 @RequestMapping("test/test.do")
 @ResponseBody // 返回参数为JSON
 public void test(@RequestBody String name) {
  System.out.println("getParams : " + name);
 }![这里写图片描述](https://img-blog.csdn.net/20161114115809292)
}

	@RequestMapping("test/test.do")
	@ResponseBody
	public void test(@RequestBody List<String> nameList) {
		System.out.println("getParams : " + nameList);
	}

	@RequestMapping("test/test.do")
	@ResponseBody
	public void test(@RequestParam("name") String name) {
		System.out.println("getParams : " + name);
	}

class Person {
	private Long id;
	private String name;
	// setter getter
}

@RequestMapping("test/test.do")
	@ResponseBody
	public void test(@RequestBody Person person) {
		System.out.println("getParams : " + person.getId() + " ," + person.getName());
	}

	@RequestMapping("test/test.do")
	@ResponseBody
	public void test(@RequestBody List<Person> personList) {
		for (Person p : personList) {
			System.out.println(p.getId() + " ," + p.getName());
		}
	}

@RequestMapping(value = "/toLogin")
	public ModelAndView toLogin(HttpServletRequest request, @RequestBody Kehu kehu) throws Exception {
		// 接收客户设备发送过来的json数据
		if (kehu != null && !StringUtil.isEmpty(kehu.cmd)) {
			uploadData(kehu);
		}
		ModelAndView mv = new ModelAndView();
		PageData pageData = this.getPageData(request);
		pageData.put("SYSNAME", Tools.readTxtFile(Const.SYSNAME)); // 读取系统名称
		mv.setViewName("base/login");
		mv.addObject("pd", pageData);
		return mv;
	}

package org.springframework.web.bind.annotation; 
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target; 
import org.springframework.http.converter.HttpMessageConverter;
 
/**
 * Annotation indicating a method parameter should be bound to the body of the web request.
 * The body of the request is passed through an {@link HttpMessageConverter} to resolve the
 * method argument depending on the content type of the request. Optionally, automatic
 * validation can be applied by annotating the argument with {@code @Valid}.
 *
 * <p>Supported for annotated handler methods in Servlet environments.
 *
 * @author Arjen Poutsma
 * @since 3.0
 * @see RequestHeader
 * @see ResponseBody
 * @see org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter
 * @see org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter
 */
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestBody {
 
	/**
	 * Whether body content is required.
	 * <p>Default is {@code true}, leading to an exception thrown in case
	 * there is no body content. Switch this to {@code false} if you prefer
	 * {@code null} to be passed when the body content is {@code null}.
	 * @since 3.2
	 */
	boolean required() default true;
 
}

/**
	 * 访问登录页
	 * @RequestBody(required=false)	表示kehu对象可以不传入。
	 * 一定要加上required=false，否则登录的时候会报400错误。错误代码：
	 * The request sent by the client was syntactically incorrect.
	 * @return
	 * @throws Exception
	 */
	@RequestMapping(value = "/toLogin")
	public ModelAndView toLogin(HttpServletRequest request, @RequestBody(required=false) Kehu kehu) throws Exception {
		// 接收硬币机发送过来的json数据
		if (kehu != null && !StringUtil.isEmpty(kehu.cmd)) {
			uploadData(kehu);
		}
		ModelAndView mv = new ModelAndView();
		PageData pageData = this.getPageData(request);
		pageData.put("SYSNAME", Tools.readTxtFile(Const.SYSNAME)); // 读取系统名称
		mv.setViewName("base/login");
		mv.addObject("pd", pageData);
		return mv;
	}