1、AdminController文件

package com.controller;

import com.myThread.AdminThread;
import org.springframework.web.bind.annotation.*;

@RestController
@CrossOrigin
@RequestMapping("/admin")
public class AdminController{
    @GetMapping("/{id}")
    public long findById(@PathVariable Long id){
        System.out.print("进来啦\n");
        //创建一个线程对象
        AdminThread t1 = new AdminThread();
        //创建一个线程对象
        AdminThread t2 = new AdminThread();
        //开启第一个线程
        t1.start();
        //开启第二个线程
        t2.start();
        return id;
    }
}

2、AdminThread文件

package com.myThread;

public class AdminThread extends Thread{
    @Override
    public void run() {
        //线程开始之后执行的代码
        for (int i = 0; i < 100; i++) {
            System.out.print("线程"+i+"\n");
        }
    }
}