SpringMVC----REST设计风格

是一种开发风格，遵从此风格开发软件，符号REST风格，则RESTFUL

两个核心要求

• 每个资源都有唯一的访问路径（访问标识）
• 不同的行为（增删改查），使用对应的请求方式（get、post、put、delete）

以上，查询——GET、增加——POST、修改——PUT、

看url就知道要什么
看http method（请求方式）就知道干什么

1. 导入依赖：jackson、javax.servlet-api、jsp-api、jstl、spring-webmvc
   pom.xml如下：

    4.0.0

    org.example
    springMVC07
    1.0-SNAPSHOT
    war
    
        
            org.mybatis
            mybatis
            3.4.6
        
        
            org.mybatis
            mybatis-spring
            1.3.1
        
        
            mysql
            mysql-connector-java
            5.1.47
        
        
            junit
            junit
            4.12
            compile
        
        
            log4j
            log4j
            1.2.17
        
        
            javax.servlet
            javax.servlet-api
            3.1.0
        
        
            javax.servlet
            jstl
            1.2
        
        
            javax.servlet
            jsp-api
            2.0
        
        
            com.alibaba
            druid
            1.2.9
        
        
            com.fasterxml.jackson.core
            jackson-databind
            2.9.8
        
        
            org.springframework
            spring-webmvc
            5.3.16
        
        
            org.springframework
            spring-jdbc
            5.3.16
        
        
            org.springframework
            spring-test
            5.1.6.RELEASE
        
        
            org.springframework
            spring-aspects
            5.1.6.RELEASE
        
    
    
        
            
                src/main/java
                
                    *.xml
                    **/*.xml
                
                true
            
        
    

2. web.xml
   

    
        mvc_xmq
        org.springframework.web.servlet.DispatcherServlet
        
            contextConfigLocation
            classpath:mvc.xml
        
        1
    
    
        mvc_xmq
        /
    

3. mvc.xml
   

• 访问路径都一样，注解不同

package com.lyx.web;

import com.alibaba.druid.support.json.JSONUtils;
import com.lyx.entity.User;
import org.apache.ibatis.annotations.Param;
import org.springframework.web.bind.annotation.*;

import java.util.Arrays;
import java.util.Date;
import java.util.List;

@RestController
public class RESTController {
    @GetMapping("/users")
    public List test(){
        System.out.println("你好啊");
        User user = new User(1, "lyx", "1233", 2, new Date());
        User user1 = new User(2, "xmq", "3434", 1, new Date());
        return Arrays.asList(user,user1);
    }
    @GetMapping("/users/{id}")
    public User test1(@PathVariable int id){
        User user = new User(id, "lll", "get1", 2, new Date());
        return user;
    }
    @PostMapping("/users")
    public String saveUser(@RequestBody String user){
//        User parse = (User)JSONUtils.parse(user);
//        System.out.println(parse);
        System.out.println(user);
        System.out.println("this is post");
        return "ok";
    }
    @PutMapping("/users")
    public String updateUsers(@RequestBody String user){
        System.out.println(user);
        System.out.println("this is put");
        return "ok";
    }
    @DeleteMapping("/users/{id}")
    public String deleteOne(@PathVariable int id){
        System.out.println(id);
        System.out.println("this is delete");
        return "ok";
    }
}

• 访问路径一样，ajax的type=get（查）/post（增）/put（改）/delete（删）

<%--
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>