标签:name CallableThread url 接口 Callable 即可 jpg new String
步骤:
- 实现Callable接口,需要返回值类型
- 重写call方法,需要抛出异常
- 创建目标对象
- 创建执行服务:ExecutorService ser = Executors.newFixedThreadPool(1);
- 提交执行:Future<Boolean> result1 = ser.submit(t1);
- 获取结果: boolean r1 = result1.get();
- 关闭服务: ser.shutdownNow();
改造同步下载网络图片:
public class CallableThread implements Callable { private String url; private String name; public CallableThread(String url, String name) { this.url = url; this.name = name; } @Override public Boolean call() throws Exception { WebDownloader webDownloader = new WebDownloader(); webDownloader.downloader(this.url,this.name); return true; } public static void main(String[] args) throws ExecutionException, InterruptedException { CallableThread t1 = new CallableThread("https://yjsc.gxu.edu.cn/images/2021-for100.jpg","./callable/1.jpg"); CallableThread t2 = new CallableThread("https://yjsc.gxu.edu.cn/images/2022yjsy.jpg","./callable/2.jpg"); CallableThread t3 = new CallableThread("https://yjsc.gxu.edu.cn/images/2022newyear.jpg","./callable/3.jpg"); CallableThread t4 = new CallableThread("https://yjsc.gxu.edu.cn/images/202010banner.jpg","./callable/4.jpg"); ExecutorService service = Executors.newFixedThreadPool(4); Future<Boolean> f1 = service.submit(t1); Future<Boolean> f2 = service.submit(t2); Future<Boolean> f3 = service.submit(t3); Future<Boolean> f4 = service.submit(t4); Boolean rs1 = f1.get(); Boolean rs2 = f2.get(); Boolean rs3 = f3.get(); Boolean rs4 = f4.get(); service.shutdownNow(); } } class WebDownloader{ public void downloader(String url, String name) { try { FileUtils.copyURLToFile(new URL(url),new File(name)); System.out.println("图片:"+name+",下载完成"); } catch (IOException e) { throw new RuntimeException(e); } } }
标签:name,CallableThread,url,接口,Callable,即可,jpg,new,String 来源: https://www.cnblogs.com/epiphany8/p/16268990.html
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