多线程之实现Calladle接口

需要使用线程池，ExecutorService的submit执行

public class CallableClient implements Callable<Boolean> {
<pre><code>private String name;
private String url;
private WebDownload webDownload;

public CallableClient(String name, String url) {
    this.name = name;
    this.url = url;
    webDownload = new WebDownload();
}

@Override
public Boolean call() throws Exception {
    webDownload.download(url,name);
    System.out.println(Thread.currentThread().getName() + "下载完毕");
    return true;
}

public static void main(String[] args) throws ExecutionException, InterruptedException {
    CallableClient c1 = new CallableClient("1.jpg","&lt;https://scpic.chinaz.net/files/pic/pic9/202106/apic33157.jpg&gt;");
    CallableClient c2 = new CallableClient("2.jpg","&lt;https://scpic.chinaz.net/files/pic/pic9/202106/bpic23398.jpg&gt;");
    CallableClient c3 = new CallableClient("3.jpg","&lt;https://scpic.chinaz.net/files/pic/pic9/201907/hpic1227.jpg&gt;");

    ExecutorService executor = Executors.newFixedThreadPool(10);
    Future&lt;Boolean&gt; f1 = executor.submit(c1);
    Future&lt;Boolean&gt; f2 = executor.submit(c2);
    Future&lt;Boolean&gt; f3 = executor.submit(c3);

    f1.get();
    f2.get();
    f3.get();

    executor.shutdownNow();
}

}

class WebDownload { public boolean download(String url,String name) { try { FileUtils.copyURLToFile(new URL(url),new File(name)); } catch (IOException e) { e.printStackTrace(); System.out.println("下载异常"); return false; } return true; } }