如何成功获取外部IP

在运行以下代码之前，请先查看以下内容：http :
//www.whatismyip.com/faq/automation.asp

public static void main(String[] args) throws Exception {    URL whatismyip = new URL("http://automation.whatismyip.com/n09230945.asp");    URLConnection connection = whatismyip.openConnection();    connection.addRequestProperty("Protocol", "Http/1.1");    connection.addRequestProperty("Connection", "keep-alive");    connection.addRequestProperty("Keep-Alive", "1000");    connection.addRequestProperty("User-Agent", "Web-Agent");    BufferedReader in =         new BufferedReader(new InputStreamReader(connection.getInputStream()));    String ip = in.readLine(); //you get the IP as a String    System.out.println(ip);}