java 我如何知道我是否已成功连接到我打开连接的 URL？
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How do I know if I have successfully connected to the URL I opened a connection with?
提问by saplingPro
To check if I can connect to the web-app named serviceI open a connection to its address.How do I check if have connected to this URL/Service? I was thinking of sending some sort of status method (as a client tries to open connection to this URL) that determines if the client was able to establish a successful connection to the service. But how do I do that ?
要检查我是否可以连接到名为service的 web 应用程序，我打开了一个到其地址的连接。如何检查是否已连接到此URL/Service？我正在考虑发送某种状态方法（当客户端尝试打开与此 URL 的连接时），以确定客户端是否能够成功建立到服务的连接。但是我该怎么做呢？
I was trying something like this :
我正在尝试这样的事情：
final URL url = new URL("http://localhost:8084/service/index.jsp");
final URLConnection urlc = url.openConnection();
InputStream response = urlc.getInputStream();
// Now call a method in the service app that sends a status method...
// .....or can I get away with this ?
回答by Evgeniy Dorofeev
I suggest
我建议
URL url = new URL("http://stackoverflow.com/questions/13775103/how-do-i-know-if-i-have-successfully-connected-to-the-url-i-opened-a-connection");
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
System.out.println(conn.getResponseCode());
it prints 200(OK)
它打印200（确定）
