SpringBoot2.x异步任务实战

1、启动类里面使用@EnableAsync注解开启功能，自动扫描

2.定义异步任务类并使用@Component标记组件被容器扫描,异步方法加上@Async
           注意点：
               1）要把异步任务封装到类里面，不能直接写到Controller
               2）增加Future<String> 返回结果 AsyncResult<String>("task执行完成");
               3）如果需要拿到结果需要判断全部的 task.isDone()
封装的异步任务类

package net.xdclass.redis_project.task;

import java.util.concurrent.Future;

import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.stereotype.Component;

@Component
@Async
public class AsyncTask {

   public void task1() throws Exception {
       Long begin = System.currentTimeMillis();
       Thread.sleep(1000L);
       Long end = System.currentTimeMillis();
       System.out.println("任务1总耗时="+(end-begin));
   }

   public void task2() throws Exception {
       Long begin = System.currentTimeMillis();
       Thread.sleep(2000L);
       Long end = System.currentTimeMillis();
       System.out.println("任务2总耗时="+(end-begin));
   }


   public void task3() throws Exception {
       Long begin = System.currentTimeMillis();
       Thread.sleep(3000L);
       Long end = System.currentTimeMillis();
       System.out.println("任务3总耗时="+(end-begin));
   }

   //获取异步结果
   public Future<String> task4() throws Exception {
       Long begin = System.currentTimeMillis();
       Thread.sleep(1000L);
       Long end = System.currentTimeMillis();
       System.out.println("任务3总耗时="+(end-begin));
       return new AsyncResult<String>("任务4");
   }

   //获取异步结果
   public Future<String> task5() throws Exception {
       Long begin = System.currentTimeMillis();
       Thread.sleep(2000L);
       Long end = System.currentTimeMillis();
       System.out.println("任务3总耗时="+(end-begin));
       return new AsyncResult<String>("任务5");
   }



   //获取异步结果
   public Future<String> task6() throws Exception {
       Long begin = System.currentTimeMillis();
       Thread.sleep(3000L);
       Long end = System.currentTimeMillis();
       System.out.println("任务3总耗时="+(end-begin));
       return new AsyncResult<String>("任务6");
   }
}

访问的controller

package net.xdclass.redis_project.controller;

import java.util.concurrent.Future;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import net.xdclass.redis_project.domain.JsonData;
import net.xdclass.redis_project.task.AsyncTask;

@RestController
@RequestMapping("/api/v1")
public class UserController {

   @Autowired
   private AsyncTask task;

   @GetMapping("asyncTask")
   public JsonData execTask() throws Exception {
       Long begin = System.currentTimeMillis();
       /*task.task1();
       task.task2();
       task.task3();*/

       Future<String> task4 = task.task4();
       Future<String> task5 = task.task5();
       Future<String> task6 = task.task6();
       for(;;) {
           if(task4.isDone()&&task5.isDone()&&task6.isDone()) {
               break;
           }
       }
       Long end = System.currentTimeMillis();
       Long total = end - begin;
       System.out.println("总耗时："+total);
       return JsonData.buildSuccess();
   }
}

SpringBoot2.x异步任务实战

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