SpringMVC入门（一）--e.注解@ResponseBody、@RequestBody使用

雨点打透心脏的1/2处 2022-05-26 06:22 196阅读 0赞

**@ResponseBody、@RequestBody两个注解主要满足开发人员使用SpringMVC框架，**

**在前后台传输和接收json格式的数据的使用**

## 1.创建Web工程准备好环境（导入jar包 配置Springmcv.xml文件） ##

## 2.编写login.html页面 ##

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.11.0.js"></script>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    
    
    <script type="text/javascript">
    function chuanJson(){
    	// json对象
    	var jsonObj = {username:"张三",age:"12",phone:"123456789",address:"天津市"};
    	var user = JSON.stringify({username:"张三",age:"12",phone:"123456789",address:"天津市"});
    	user.toJSONString();
    	alert(user);
    	$.ajax({
    		type:'post',
    		url:'${pageContext.request.contextPath}/rest/user/aa/Requestparam.do',
    		contentType: "application/json", 
    		data:user,
    		dataType:'json',
    		success:function(mm){
    			alert(mm);
    		}
    	});
    }
    </script>
    <body>
    
    	<input type="button" οnclick="chuanJson();" value="提交">
    <hr >
    </body>
    </html>

**注意：使用ajax请求需要引入jquery的js包**

## 3.编写springmvc配置文件 ##

### 3.1 手动添加json数据支持的配置 ###

<?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:mvc="http://www.springframework.org/schema/mvc"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans 
    		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
    		http://www.springframework.org/schema/mvc 
    		http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
    		http://www.springframework.org/schema/context 
    		http://www.springframework.org/schema/context/spring-context-3.2.xsd 
    		http://www.springframework.org/schema/aop 
    		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
    		http://www.springframework.org/schema/tx 
    		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
    		
    		
    		<context:component-scan base-package="com.zit.controller"></context:component-scan>
    		
    		
    		
    		
    		
    		<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
    		
    		
    		<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    		
    			
    			<property name="messageConverters">
    				<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
    				</bean>
    			</property>
    		</bean>
    		
    		
    		
    		<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		<property name="prefix" value="/WEB-INF/pages/"></property>
    		<property name="suffix" value=".jsp"></property>		
    		</bean>
    		</beans>

3.2 使用<mvc:annotation-driven/>代替 对处理器映射器和处理器适配器 的配置

<?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:mvc="http://www.springframework.org/schema/mvc"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans 
    		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
    		http://www.springframework.org/schema/mvc 
    		http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
    		http://www.springframework.org/schema/context 
    		http://www.springframework.org/schema/context/spring-context-3.2.xsd 
    		http://www.springframework.org/schema/aop 
    		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
    		http://www.springframework.org/schema/tx 
    		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
    		
    		
    		<context:component-scan base-package="com.zit.controller"></context:component-scan>
    		
    		<mvc:annotation-driven/>
    		
    		
    		
    		
    		
    		
    		
    		
    		
    		
    		<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		<property name="prefix" value="/WEB-INF/pages/"></property>
    		<property name="suffix" value=".jsp"></property>		
    		</bean>
    		</beans>

## 4. 编写执行类 ##

package com.zit.controller;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import com.zit.entity.User;
    import com.zit.entity.WrapObject;
    
    @Controller
    @RequestMapping("/user")
    public class UserController {
    /**
    	 * 接受json格式数据
    	 * @param id
    	 * @return
    	 */
    	@RequestMapping("/aa/Requestparam")
    	
    	public @ResponseBody User jsonRequest(@RequestBody User user){
    		System.out.println("121212");
    		System.out.println(user.getAddress());
    		//重定向
    		return user;
    	}
    }