[java]获取IP地址的常用方法

来源：互联网发布：nginx 文件服务器编辑：程序博客网时间：2024/05/23 16:39

常见问题：

1.明确要获取的是用户浏览器所在的用户端IP地址，还是服务器IP地址

2.是局域网网的IP地址还是外网IP地址

3. 如果用代理的话该怎么获取真实的IP地址

具体实现方法如下：

import org.jsoup.Connection;import org.jsoup.Jsoup;import javax.servlet.http.HttpServletRequest;import java.io.IOException;import java.net.InetAddress;import java.net.UnknownHostException;/** * Created by Kangbin on 2017/9/12. */public class IPUtils {    /**     * 获取浏览器所在用户端的ip地址     * @param request     * @return     */    public static String getClientIpAddr(HttpServletRequest request) {        String ipAddress = request.getHeader("x-forwarded-for");        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {            ipAddress = request.getHeader("Proxy-Client-IP");        }        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {            ipAddress = request.getHeader("WL-Proxy-Client-IP");        }        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {            ipAddress = request.getRemoteAddr();            if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {                //根据网卡取本机配置的IP                InetAddress inet = null;                try {                    inet = InetAddress.getLocalHost();                } catch (UnknownHostException e) {                    e.printStackTrace();                }                ipAddress = inet.getHostAddress();            }        }        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割        if (ipAddress != null && ipAddress.length() > 15) { //"***.***.***.***".length() = 15            if (ipAddress.indexOf(",") > 0) {                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));            }        }//        if (ipAddress != null && (ipAddress.indexOf("172.") >= 0 || ipAddress.indexOf("192.") >= 0)) { //如果是内网ip， 则说明在同一局域网， 直接取系统外网ip//            ipAddress = "183.131.11.57"; //如果是内网，写死为外网值////            ipAddress = getPublicIP();//        }        return ipAddress;    }    /**     * 得到本机的外网ip，出现异常时返回本地IP     *     * @return     */    public static String getPublicIP() {        String ip = null;        try {            ip = InetAddress.getLocalHost().getHostAddress();        } catch (UnknownHostException e) {            e.printStackTrace();        }        org.jsoup.nodes.Document doc = null;        Connection con = null;        // 连接 http://1212.ip138.com/ic.asp        con = Jsoup.connect("http://1212.ip138.com/ic.asp").timeout(10000);        try {            doc = con.get();            // 获得包含本机ip的文本串：您的IP是：[xxx.xxx.xxx.xxx] 来自：YY            org.jsoup.select.Elements els = doc.body().select("center");            for (org.jsoup.nodes.Element el : els) {                ip = el.text();            }            // 从文本串过滤出ip，用正则表达式将非数字和.替换成空串""            ip = ip.replaceAll("[^0-9.]", "");        } catch (IOException e) {            e.printStackTrace();            return ip;        }        return ip;    }}

阅读全文

0 0