使用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,比方说

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

我如何获得此网址的IP地址？我试过用

InetAddress address = InetAddress.getByName(urlStr);

但结果总是返回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

你需要给hostname到GetByName方法()方法,它返回

给定主机名称的主机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

得到的 IP address

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