Restful

1.特点

• RESTful是一种架构风格，强调简单、轻量级和对资源的状态less操作。
• RESTful是通过HTTP协议进行通信的。
• RESTful的应用程序可以调用运行在不同服务器上的服务或函数。
• RESTful的接口通常使用JSON，但实际上它们都支持多种数据格式。
• RESTful的接口都是无状态的，意味着每个请求都是独立的，服务器不会保存之前请求的状态。
• RESTful的接口通常使用JSON。JSON更简洁，易于解析。
• RESTful的接口通常不使用SOAP协议，也不遵循WS-*标准，更加简单和灵活。
• RESTful的接口遵循REST架构原则，使用标准的HTTP方法（如GET, POST, PUT, DELETE）进行资源的操作。
• RESTful的接口更简单、更轻量级，通常更易于开发和维护

2.Rest设计规范

3.基于通用Mapper的Rest编写API

启动类

package com.saddam;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
//扫描mybatis通用mapper
@MapperScan(basePackages = "com.saddam.mapper")
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}

mapper

package com.saddam.mapper;

import com.saddam.my.mapper.MyMapper;
import com.saddam.pojo.Stu;

public interface StuMapper extends MyMapper<Stu> {
}

mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.saddam.mapper.StuMapper" >
  <resultMap id="BaseResultMap" type="com.saddam.pojo.Stu" >
    <!--
      WARNING - @mbg.generated
    -->
    <id column="id" property="id" jdbcType="INTEGER" />
    <result column="name" property="name" jdbcType="VARCHAR" />
    <result column="age" property="age" jdbcType="INTEGER" />
  </resultMap>
</mapper>

service

package com.saddam.service;

import com.saddam.pojo.Stu;

public interface StuService {

    public Stu getStuInfo(int id);

    public void saveStu();

    public void updateStu(int id);

    public void deleteStu(int id);
}

impl

package com.saddam.service.impl;

import com.saddam.mapper.StuMapper;
import com.saddam.pojo.Stu;
import com.saddam.service.StuService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Service
public class StuServiceImpl implements StuService {

    @Autowired
    public StuMapper stuMapper;

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public Stu getStuInfo(int id) {
        return stuMapper.selectByPrimaryKey(id);
    }

    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public void saveStu() {

        Stu stu = new Stu();
        stu.setName("jack");
        stu.setAge(19);
        stuMapper.insert(stu);
    }

    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public void updateStu(int id) {

        Stu stu = new Stu();
        stu.setId(id);
        stu.setName("lucy");
        stu.setAge(20);
        stuMapper.updateByPrimaryKey(stu);
    }

    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public void deleteStu(int id) {
        stuMapper.deleteByPrimaryKey(id);
    }
}

pojo

package com.saddam.pojo;

import javax.persistence.Id;

public class Stu {
    @Id
    private Integer id;

    private String name;

    private Integer age;

    /**
     * @return id
     */
    public Integer getId() {
        return id;
    }

    /**
     * @param id
     */
    public void setId(Integer id) {
        this.id = id;
    }

    /**
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return age
     */
    public Integer getAge() {
        return age;
    }

    /**
     * @param age
     */
    public void setAge(Integer age) {
        this.age = age;
    }
}

controller

package com.saddam.controller;

import com.saddam.service.StuService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

//@Controller
@RestController
public class StuFooController {

    @Autowired
    private StuService stuService;
    /*
    获取使用GetMapping
     */
    @GetMapping("/getStu")
    public Object getStu(int id){
        return stuService.getStuInfo(id);
    }

    /*
    增删改使用PostMapping
     */
    @PostMapping("/saveStu")
    public Object saveStu(){
        stuService.saveStu();
        return "OK";
    }

    @PostMapping("/updateStu")
    public Object updateStu(int id){
        stuService.updateStu(id);
        return "OK";
    }

    @PostMapping("/deleteStu")
    public Object deleteStu(int id){
        stuService.deleteStu(id);
        return "OK";
    }
}