Java 多线程（三）通过Callable接口实现网络资源下载

Java 多线程（三）通过Callable接口实现网络资源下载

package com.zzz.thread;

import java.util.concurrent.*;

import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.IOException;
import java.net.URL;

public class TestThread3 implements Callable<Boolean> {
    private String url;
    private String name;

    public TestThread3(String url, String name) {
        this.url = url;     //网络图片地址
        this.name = name;   //保存的文件名
    }

    @Override
    public Boolean call() {
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.downloader(url,name);
        System.out.println("下载了文件："+name);
        return true;
    }

    //线程执行体
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        TestThread3 t1 = new TestThread3("https://www.kuangstudy.com/favicon.ico","threaddownload1.ico");
        TestThread3 t2 = new TestThread3("https://www.qq.com/favicon.ico","threaddownload2.ico");
        TestThread3 t3 = new TestThread3("https://www.kuangstudy.com/assert/images/doudizhu.jpg","threaddownload3.jpg");

        ExecutorService ser = Executors.newFixedThreadPool(3);

        Future<Boolean> r1 = ser.submit(t1);
        Future<Boolean> r2 = ser.submit(t2);
        Future<Boolean> r3 = ser.submit(t3);

        boolean rs1 = r1.get();
        boolean rs2 = r2.get();
        boolean rs3 = r3.get();
        System.out.println(rs1);
        System.out.println(rs2);
        System.out.println(rs3);
        ser.shutdown();
    }
}

//下载器
class WebDownloader {
    public void downloader(String url, String name){
        try {
            FileUtils.copyURLToFile(new URL(url),new File(name));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常，downloader方法出现问题！");
        }
    }
}