Callable类

package www.shushu.demo02;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.*;

/*
callable的好处
1.可以定义返回值
2.可以抛出异常
 */

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

    public TestCallable(String url, String name) {
        this.name = name;
        this.url = url;
    }


    public static void main(String[] args) throws ExecutionException, InterruptedException {
        TestCallable testCallable = new TestCallable("https://tse3-mm.cn.bing.net/th/id/OIP.1sYdjAro5j4eFreLNVBBCAHaEf?w=307&h=186&c=7&o=5&dpr=1.25&pid=1.7","1.jpg");
        TestCallable testCallable2 = new TestCallable("https://tse2-mm.cn.bing.net/th/id/OIP.v-kgJrckGXE3zi7HWAAAqQHaEK?w=331&h=186&c=7&o=5&dpr=1.25&pid=1.7","2.jpg");
        TestCallable testCallable3 = new TestCallable("https://tse3-mm.cn.bing.net/th/id/OIP.-iKnMH97MAc-HQS458hNKQHaJ4?w=140&h=186&c=7&o=5&dpr=1.25&pid=1.7","3.jpg");

        //创建执行服务：
        ExecutorService ser = Executors.newFixedThreadPool(3);

        //提交执行
        Future<Boolean> result1 = ser.submit(testCallable);
        Future<Boolean> result2 = ser.submit(testCallable2);
        Future<Boolean> result3 = ser.submit(testCallable3);

        //获取结果
        boolean rs1 = result1.get();
        boolean rs2 = result2.get();
        boolean rs3 = result3.get();

        System.out.println(rs1);
        System.out.println(rs2);
        System.out.println(rs3);

        //关闭服务
        ser.shutdownNow();
    }

    @Override
    public Boolean call() throws Exception {
        WebDownloader webDownloader = new WebDownloader();
        try {
            webDownloader.downloader(url,name);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("下载好文件："+name);
        return true;
    }
}
class WebDownloader{
    public void downloader(String url,String name) throws IOException {
        FileUtils.copyURLToFile(new URL(url),new File(name));

    }
}