Springboot--Async

              Springboot--Async

package com.example.springbootasync.Controller;

/*
任务一开始执行
任务二开始执行
任务三开始执行
耗时135
耗时573
耗时7282
 */
import com.example.springbootasync.service.AsyncService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.nio.charset.Charset;
import java.util.concurrent.Future;

@RestController
public class FirstController {

    @Autowired
    private AsyncService asyncService;


    @RequestMapping("/async")
    @ResponseBody
    public String asyncTest(Model model)throws Exception {
        long start=System.currentTimeMillis();
        Future<String> tast1= asyncService.doTask1();
        Future<String> tast2= asyncService.doTask2();
        Future<String> tast3= asyncService.doTask3();
        while (true){
            if (tast1.isDone() && tast2.isDone() && tast3.isDone() ){
                break;
            }
            Thread.sleep(1000);
        }
        long end=System.currentTimeMillis();
        return "耗时"+(end-start);
    }
}

package com.example.springbootasync.service;

import java.util.concurrent.Future;

public interface AsyncService {

     Future<String> doTask1()throws Exception;
     Future<String> doTask2()throws Exception;
     Future<String> doTask3()throws Exception;


}

package com.example.springbootasync.service.impl;

import com.example.springbootasync.service.AsyncService;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.stereotype.Service;

import java.util.Random;
import java.util.concurrent.Future;


@Service
public class AsyncServiceImpl implements AsyncService {

    private static Random random=new Random();
    @Override
    @Async
    public Future<String> doTask1() throws Exception {
        System.out.println("任务一开始执行");
        long start=System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end=System.currentTimeMillis();
        System.out.println("耗时"+(end-start));
        return new AsyncResult<>("任务一结束");
    }
    @Async
    @Override
    public Future<String> doTask2() throws Exception {
        System.out.println("任务二开始执行");
        long start=System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end=System.currentTimeMillis();
        System.out.println("耗时"+(end-start));
        return new AsyncResult<>("任务二结束");
    }
    @Async
    @Override
    public Future<String> doTask3() throws Exception {
        System.out.println("任务三开始执行");
        long start=System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end=System.currentTimeMillis();
        System.out.println("耗时"+(end-start));
        return new AsyncResult<>("任务三结束");
    }
}

package com.example.springbootasync;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;

@SpringBootApplication
@EnableAsync //异步调用
public class SpringbootAsyncApplication {

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

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>springboot-async</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot-async</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>