springboot基於註解實現異步

spring 通過TaskExecutor實現異步

 

配置類

 

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;

/**
 * Created by RZL on 2018/4/13.
 */
@Configuration
@EnableAsync//開啓異步註解任務支持
public class TaskExecutorConfig implements AsyncConfigurer {

    /**
     * 配置類實現AsyncConfigurer接口並重寫getAsyncExecutor方法，並返回一個ThreadPoolTaskExecutor
     * 這樣就獲取到了一個基於線程池TaskExecExceutor
     * @return
     */
    @Override
    public Executor getAsyncExecutor(){
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        //核心線程數
        taskExecutor.setCorePoolSize(5);
        //最大線程數
        taskExecutor.setMaxPoolSize(10);
        //隊列大小
        taskExecutor.setQueueCapacity(20);
        taskExecutor.initialize();
        return taskExecutor;
    }
}

 

 

業務類

 

import com.example.myproject.async.AsyncDemo1;
import com.example.myproject.async.AsyncDemo2;
import com.example.myproject.async.AsyncDemo3;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * Created by RZL on 2018/4/13.
 */
@Slf4j
@Service
public class AsyncService {

    @Autowired
    private AsyncDemo1 asyncDemo1;
    @Autowired
    private AsyncDemo2 asyncDemo2;
    @Autowired
    private AsyncDemo3 asyncDemo3;

    public void AsyncService(){

        asyncDemo1.demo1();
        asyncDemo2.demo2();
        asyncDemo3.demo3();

    }

}

 

異步任務類

 

import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

/**
 * Created by RZL on 2018/4/13.
 */
@Async//註解在類級別，則表明該類所有的方法都是異步，這裏的方法自動被注入使用ThreadpoolTaskExecutor作爲TaskExecutor
@Slf4j
@Component
public class AsyncDemo1 {

    public void demo1(){
        for(int i=0;i<5;i++){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            log.info("demo1:{}",i);
        }
    }
}

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

/**
 * Created by RZL on 2018/4/13.
 */
@Slf4j
@Component
public class AsyncDemo2 {

    public void demo2(){
        for(int i=0;i<5;i++){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            log.info("demo2:{}",i);
        }
    }
}

import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

/**
 * Created by RZL on 2018/4/13.
 */
@Async
@Slf4j
@Component
public class AsyncDemo3 {

    public void demo3(){
        for(int i=0;i<5;i++){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            log.info("demo3:{}",i);
        }
    }
}

 

 

控制層

 

@RequestMapping("async")
public void async(){
    asyncService.AsyncService();
}

 

 

輸出結果

2018-04-13 10:34:40.142  INFO 6160 --- [nio-8888-exec-1] com.example.myproject.async.AsyncDemo2   : demo2:0
2018-04-13 10:34:40.144  INFO 6160 --- [lTaskExecutor-1] com.example.myproject.async.AsyncDemo1   : demo1:0
2018-04-13 10:34:41.142  INFO 6160 --- [nio-8888-exec-1] com.example.myproject.async.AsyncDemo2   : demo2:1
2018-04-13 10:34:41.144  INFO 6160 --- [lTaskExecutor-1] com.example.myproject.async.AsyncDemo1   : demo1:1
2018-04-13 10:34:42.142  INFO 6160 --- [nio-8888-exec-1] com.example.myproject.async.AsyncDemo2   : demo2:2
2018-04-13 10:34:42.144  INFO 6160 --- [lTaskExecutor-1] com.example.myproject.async.AsyncDemo1   : demo1:2
2018-04-13 10:34:43.142  INFO 6160 --- [nio-8888-exec-1] com.example.myproject.async.AsyncDemo2   : demo2:3
2018-04-13 10:34:43.144  INFO 6160 --- [lTaskExecutor-1] com.example.myproject.async.AsyncDemo1   : demo1:3
2018-04-13 10:34:44.142  INFO 6160 --- [nio-8888-exec-1] com.example.myproject.async.AsyncDemo2   : demo2:4
2018-04-13 10:34:44.144  INFO 6160 --- [lTaskExecutor-1] com.example.myproject.async.AsyncDemo1   : demo1:4
2018-04-13 10:34:45.148  INFO 6160 --- [lTaskExecutor-2] com.example.myproject.async.AsyncDemo3   : demo3:0
2018-04-13 10:34:46.148  INFO 6160 --- [lTaskExecutor-2] com.example.myproject.async.AsyncDemo3   : demo3:1
2018-04-13 10:34:47.148  INFO 6160 --- [lTaskExecutor-2] com.example.myproject.async.AsyncDemo3   : demo3:2
2018-04-13 10:34:48.148  INFO 6160 --- [lTaskExecutor-2] com.example.myproject.async.AsyncDemo3   : demo3:3

2018-04-13 10:34:49.148  INFO 6160 --- [lTaskExecutor-2] com.example.myproject.async.AsyncDemo3   : demo3:4

 

 

從打印結果來看 demo1與demo2同時進行輸出結果，demo3是在前兩者運行完畢後再輸出的。

這是因爲在demo1中加入了@Async註解，所以會與demo2同時進行，而demo2中沒有加入@Async註解，所以demo3只有在deno2運行結束後纔會運行