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If you need to check that a remote host has a socket open, check following example. This example creates a socket at the HTTP port over your custom network proxy. If the proxy requires authentication, you may override the default Authenticator. Keep in mind that it is only an example!
@Test
public void testSocketConnection() throws Exception {
SocketAddress addr = new InetSocketAddress("proxy.cinhtau.net", 8080);
Proxy proxy = new Proxy(Proxy.Type.HTTP, addr);
Socket socket = new Socket(proxy);
// if you have a proxy user
Authenticator.setDefault(new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("esmeralda", "secret".toCharArray());
}
});
InetSocketAddress dest = new InetSocketAddress("cinhtau.net", 80);
try {
socket.connect(dest);
assertTrue(socket.isConnected());
} catch (IOException e) {
LOGGER.error("Network error", e);
} finally {
socket.close();
}
}Read more → Java Networking and Proxies
