如何检查Java中是否存在Internet连接？ [英] How to check if internet connection is present in java?

问题描述

如何检查是否可以通过java连接到互联网？一种方法是：

How do you check if you can connect to the internet via java? One way would be:

final URL url = new URL("http://www.google.com");
final URLConnection conn = url.openConnection();
... if we got here, we should have net ...

如果您需要经常进行连续检查，并且互联网连接的丢失非常可能， 会更适合执行该任务

But is there something more appropriate to perform that task, especially if you need to do consecutive checks very often and a loss of internet connection is highly probable?

推荐答案

您应该连接到实际应用程序所需的位置。否则，您将测试您是否与某处无关（在这种情况下是Google）。

You should connect to the place that your actual application needs. Otherwise you're testing whether you have a connection to somewhere irrelevant (Google in this case).

特别是，如果您想与网络服务交谈，如果你是在web服务的控制，它是一个好主意，有某种廉价的获取状态的Web方法。这样，您就能更好地了解您的真实调用是否可能工作。

In particular, if you're trying to talk to a web service, and if you're in control of the web service, it would be a good idea to have some sort of cheap "get the status" web method. That way you have a much better idea of whether your "real" call is likely to work.

在其他情况下，只打开一个应该打开的端口连接可能足够 - 或发送ping。 InetAddress .isReachable 可能是适合您需要的API。

In other cases, just opening a connection to a port that should be open may be enough - or sending a ping. InetAddress.isReachable may well be an appropriate API for your needs here.

这篇关于如何检查Java中是否存在Internet连接？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！