我想你想用 InetSocketAddress.getAddress() 喜欢

((InetSocketAddress) Sock.getRemoteSocketAddress()).getAddress()

或者，你可以使用 String.split(String) 喜欢

Sock.getRemoteSocketAddress().toString().split(":")[0];

servletrequest.getremoteaddr（）
string ipaddress=request.getremoteaddr（）；

req.getRemoteAddr() 方法是什么
如果你有servlet

public void doGet(HttpServletRequest req, HttpServletResponse resp)
 throws IOException {

        // Get client's IP address
        String ipAddress = req.getRemoteAddr(); // ip

        // Get client's hostname
        String hostname = req.getRemoteHost(); // hostname
    }

import java.net.*;

public class IP {
    public static void main(String[] args) throws Exception {
        System.out.println(InetAddress.getLocalHost());
        System.out.println(InetAddress.getByName("www.xxx.com"));
    }
}