java - 找不到 URL 内容时更快失败，howto

Question

我有一个线程池，它循环遍历一堆页面并检查是否存在某个字符串。如果找到字符串或未找到响应，则几乎是即时的，但是如果服务器离线或应用程序未运行，则获得拒绝似乎需要几秒钟的时间

如何更改代码以更快地失败？

    for (Thread thread : pool) {
        thread.start();
    }

    for (Thread thread : pool) {
        try {
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();

        }
    }

这是我的运行方法

@Override
public void run() {
    for (Box b : boxes) {
        try {
            connection = new URL(b.getUrl()).openConnection();
            scanner = new Scanner(connection.getInputStream());
            scanner.useDelimiter("\\Z");
            content = scanner.next();

            if (content.equals("YES")) {
            } else {
                System.out.println("\tFAILED ON " + b.getName() + " BAD APPLICATION STATE");
            }

        } catch (Exception ex) {
            System.out.println("\tFAILED ON " + b.getName() + " BAD APPLICATION STATE");
        }
    }
}

Answer 1

if server is offline or application is not running getting a rejection seems to take seconds

根据您的需要设置超时。

如果您要打开 URLConnection从 URL 您可以设置超时。

URL url = new URL(urlPath);
URLConnection con = url.openConnection();
con.setConnectTimeout(connectTimeout);
con.setReadTimeout(readTimeout);
InputStream in = con.getInputStream();