用URL字符串获取IP地址?(Java)

Question

在我的程序中，用户输入一个url字符串，比如

http://www.engineering.uiowa.edu/~hawkeng//fall01/graphics/potato.gif

我该如何获取此url的IP地址？我试过使用

InetAddress address = InetAddress.getByName(urlStr);

但是结果总是返回null。获取IP地址的正确方法是什么？

Answer 1

试试这个：

InetAddress address = InetAddress.getByName(new URL(urlString).getHost());

获取原始IP:

String ip = address.getHostAddress();

Answer 2

您需要将hostname赋予getByName（）方法，它会返回

给定主机名称的主机的IP地址。

URL url = new URL("http://www.engineering.uiowa.edu/~hawkeng//fall01/graphics/potato.gif");
System.out.println(url.getHost());
InetAddress address = InetAddress.getByName(url.getHost());
System.out.println(address.toString());

输出=www.engineering.uiowa.edu/128.255.17.182

获取IP address

String temp = address.toString();
String IP = temp.substring(temp.indexOf("/")+1,temp.length());