正确的方式来测试，如果服务器Java是吗？ [英] Proper way to test if server is up in Java?

问题描述

什么是简单地看看，可向网站/服务器的连接的正确方法？我想这对于一个应用程序，我编码，如果我的网站变为脱机状态，这将只是提醒我。

What would be the proper way to simply see if a connection to a website/server can be made? I want this for an application I am coding that will just alert me if my website goes offline.

谢谢！

推荐答案

您可以使用HttpURLConnection类发送请求并检查响应正文文本是唯一到该页面（而不仅仅是检查，看看是否有一个响应在所有的，以防万一出现错误或维护页面或东西是被服务）。

You can use an HttpURLConnection to send a request and check the response body for text that is unique to that page (rather than just checking to see if there's a response at all, just in case an error or maintenance page or something is being served).

Apache的百科全书有一个图书馆，消除了很多使锅炉板HTTP请求在Java中。

Apache Commons has a library that removes a lot of the boiler plate of making Http requests in Java.

我从来没有做过这样的事情特别在Android，但我会感到惊讶，如果它有什么不同。

I've never done anything like this specifically on Android, but I'd be surprised if it's any different.

下面是一个简单的例子：

Here's a quick example:

URL url = new URL(URL_TO_APPLICATION);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
InputStream stream = connection.getInputStream();
Scanner scanner = new Scanner(stream); // You can read the stream however you want. Scanner was just an easy example
boolean found = false;
while(scanner.hasNext()) {
    String next = scanner.next();
    if(TOKEN.equals(next)) {
        found = true;
        break;
    }
}

if(found) {
    doSomethingAwesome();
} else {
    throw aFit();
}

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