Postman下载安装、测试（附样例）及getMapping、PostMapping区别

package com.example.mybatis.controller;


import com.example.mybatis.service.UserServiceImpl;
import com.example.mybatis.pojo.User;
import com.example.mybatis.util.Response;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;


import java.util.List;


@RestController
public class UserController {
@Autowired
private UserServiceImpl userService;


@GetMapping(value = "findAll")
public List findAll() {
/* List userList = userService.findAll();
for(User user: userList)
{
System.out.println(user);
}
return userList;
*/
return userService.findAll();
}


@PostMapping(value = "add")
// public int addUser(){
// User u = new User(108,"ooo","123");
// int stat = userService.addUser(u);
// return stat;
public List addUser(@RequestHeader("application/json")@RequestBody User user){
userService.addUser(user);
return userService.findAll();




}
@GetMapping(value = "delete")
public String deleteUser(){
Integer id = 101;
userService.deleteUser(id);
return "delete ok";
}


@PostMapping(value = "select")
public User selectUser(){
Integer id = 3;
User us = userService.selectUser(id);
System.out.println(us);
return us;
}
@PostMapping(value = "update")
public List updateUser(@RequestHeader("application/json")@RequestBody User user){
userService.updateUser(user);
return userService.findAll();
// User u = new User(3,"lixinyu","589");
// userService.updateUser(u);
}


@GetMapping("showInfo")
public String show() {
String str = null;
str.length();
return "ok！！";


}


}