springboot中的异步操作，就是多线程操作
1.直接在service的方法上面加上@Async注解，就可以标明该方法是一个异步方法，也就是如果controller中调用了service中的这个方法，就会开启另一个线程来运行这个方法。
service.java
package com.anlysqx.service;import java.util.Date;import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;@Service
public class AsyncService {@Asyncpublic String asyncService(){System.out.println("async开始执行");StringBuilder stringBuilder = new StringBuilder();for(int i=0;i<5;i++){try {Thread.sleep(1000);String str = "i = "+i;System.out.println(str);stringBuilder.append(str);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}System.out.println("async执行结束");return stringBuilder.toString();}}
controller.java
package com.anlysqx.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import com.anlysqx.service.AsyncService;@Controller
public class AsyncController {@Autowiredprivate AsyncService asyncService;@Value("${name}")private String name;@ResponseBody@RequestMapping("/async")public String getAsyncService(){System.out.println("async controller start ...");String msg = asyncService.asyncService();
// System.out.println(msg);System.out.println("async controller end ...");return msg;}@RequestMapping("/name")@ResponseBodypublic String getName(){return name;}}