实现callable接口（了解即可）

Callable 有返回类型
重写 public Boolean call()方法

package com.pln.callables;
import com.pln.thread.TestThread2;
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.*;
public class TestCallable1 implements Callable <Boolean>{
    private String url;
    private String name;
    public TestCallable1(String url,String name){
        this.url = url;
        this.name = name;
    }
    @Override
    public Boolean call() throws Exception {
        WebDownLoader webDownLoader = new WebDownLoader();
        webDownLoader.downLoader(url,name);
        System.out.println("下载名字+"+name);
        return true;
    }
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //        调用带参的构造方法
        TestCallable1 t1 = new TestCallable1("http://www.mdjdx.cn/mdtpweb/upload/ew/uploadfile/f20196302356495401.jpg","1.jpg");
        TestCallable1 t2 = new TestCallable1("http://www.mdjdx.cn/mdtpweb/upload/ew/uploadfile/f20196302342173219.jpg","2.jpg");
        TestCallable1 t3 = new TestCallable1("http://www.mdjdx.cn/mdtpweb/upload/ew/uploadfile/f20198310114727.jpg","3.jpg");
        //创建执行服务
        ExecutorService ser = Executors.newFixedThreadPool(3);//3代表有三个对象三张图片下载
        //提交执行
        Future<Boolean> r1 = ser.submit(t1);
        Future<Boolean> r2 = ser.submit(t2);
        Future<Boolean> r3 = ser.submit(t3);
        //获取结果
        boolean rs1 = r1.get();
        boolean rs2 = r2.get();
        boolean rs3 = r3.get();
        //关闭服务
        ser.shutdownNow();
    }
}
//下载器
class WebDownLoader {
//    下载方法
    public void downLoader(String url,String name) throws IOException {
        FileUtils.copyURLToFile(new URL(url),new File(name));
    }
}