專案中經常會遇到一些執行時間較長的任務，這個時候很容易就想到使用多執行緒來處理。由於這個需求太常用，因此我們的spring大佬就直接幫我們從框架層面實現。

例項程式碼：web介面非同步

MutiThreadApplication

@SpringBootApplication
@EnableAsync    //注意加這個註解，啟動非同步功能
public class MutiThreadApplication {

    //配置系統執行緒池
    @Bean
    public Executor getExecutor() {
        ThreadPoolTaskExecutor  executor = new
 
 ThreadPoolTaskExecutor();
        executor.setCorePoolSize(10);
        executor.setMaxPoolSize(20);
        executor.setQueueCapacity(25);
        executor.setAwaitTerminationSeconds(20000);
        return executor;
    }

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

TestController

package com.liao.controller;

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

import com.liao.service.TestService;


@RestController
public class TestController {

    @Autowired
    private TestService testService;
 


    @RequestMapping("/test")
    public String test() {
        System.out.println("main:start");
        testService.test();

        System.out.println("main:end");

        return "end";
    }

}

TestService

package com.liao.service;

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service
public class TestService {

    @Async  //此註解標識該方法要非同步執行，spirng會啟動一個執行緒異常執行該方法
    public void test() {
        System.out.println(Thread.currentThread().getName()+":start");

        try {
            Thread.sleep(10000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        System.out.println(Thread.currentThread().getName()+":end");
    }

}

執行結果
web請求立刻返回結果。
系統日誌如下：

main:start
main:end
getExecutor-1:start
getExecutor-1:end