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IPUtil

获取 window 或 linux 当前操作系统公网内网 ip 地址。

代码实现

import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.InetAddress;import java.net.NetworkInterface;import java.net.SocketException;import java.net.URL;import java.net.URLConnection;import java.net.UnknownHostException;import java.util.Enumeration;import java.util.regex.Matcher;import java.util.regex.Pattern;import javax.servlet.http.HttpServletRequest;/** * @author NNroc * @date 2020/6/20 14:40 */public class IPUtil {
       /**     * 获取 ip     *     * @return     * @throws SocketException     * @throws UnknownHostException     */    public static String getIpAddress() throws UnknownHostException {
           if (isWindowsOS()) {
               return getWindowsLocalIp();        } else {
               return getSelfPublicIp();        }    }    /**     * 判断当前操作系统     *     * @return     */    private static boolean isWindowsOS() {
           boolean isWindowsOS = false;        String osName = System.getProperty("os.name");        if (osName.toLowerCase().contains("windows")) {
               isWindowsOS = true;        }        return isWindowsOS;    }    private static String getWindowsLocalIp() throws UnknownHostException {
           return InetAddress.getLocalHost().getHostAddress();    }    /**     * 获取 Linux 下的 内网 IP 地址     *     * @return IP地址     * @throws SocketException     */    public static String getLinuxLocalIp() throws SocketException {
           String ip = "";        for (Enumeration
   
     en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
               NetworkInterface intf = en.nextElement();            String name = intf.getName();            if (!name.contains("docker") && !name.contains("lo")) {
                   for (Enumeration
    
      enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                       InetAddress inetAddress = enumIpAddr.nextElement();                    if (!inetAddress.isLoopbackAddress()) {
                           String ipaddress = inetAddress.getHostAddress().toString();                        if (!ipaddress.contains("::") && !ipaddress.contains("0:0:") && !ipaddress.contains("fe80")) {
                               ip = ipaddress;                            System.out.println(ipaddress);                        }                    }                }            }        }        return ip;    }    /**     * 获取用户真实 IP 地址（公网），不使用 request.getRemoteAddr(); 的原因是有可能用户使用了代理软件方式避免真实IP地址,     * 
     
     * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？     * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。     * 
     
     * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,     * 192.168.1.100     *     * @param request     * @return     */    private static String getIpRealAddress(HttpServletRequest request) {
           String ip = request.getHeader("x-forwarded-for");        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
               ip = request.getHeader("Proxy-Client-IP");        }        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
               ip = request.getHeader("WL-Proxy-Client-IP");        }        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
               ip = request.getHeader("HTTP_CLIENT_IP");        }        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
               ip = request.getHeader("HTTP_X_FORWARDED_FOR");        }        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
               ip = request.getRemoteAddr();        }        return ip;    }//    ----------------- 获取公网 ip -----------------    /**     * 外网ip地址     */    private static String publicIp;    /**     * 下面url返回地址都包含ip地址，为防止某个url失效，     * 遍历url获取ip地址，有一个能成功获取就返回     */    private static String[] urls = {
               "http://whatismyip.akamai.com",            "http://icanhazip.com",            "http://members.3322.org/dyndns/getip",            "http://checkip.dyndns.com/",            "http://pv.sohu.com/cityjson",            "http://ip.taobao.com/service/getIpInfo.php?ip=myip",            "http://www.ip168.com/json.do?view=myipaddress",            "http://www.net.cn/static/customercare/yourip.asp",            "http://ipecho.net/plain",            "http://myip.dnsomatic.com",            "http://tnx.nl/ip",            "http://ifconfig.me"    };    /**     * ip地址的匹配正则表达式     */    private static String regEx = "((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)";    private static Pattern pattern = Pattern.compile(regEx);    /**     * 获取本机外网地址     *     * @return     */    public static String getSelfPublicIp() {
           if (publicIp != null && !"".equals(publicIp.trim())) {
               return publicIp;        }        for (String url : urls) {
               //http访问url获取带ip的信息            String result = getUrlResult(url);            //正则匹配查找ip地址            Matcher m = pattern.matcher(result);            while (m.find()) {
                   publicIp = m.group();//                System.out.println(url + " ==> " + publicIp);                //只获取匹配到的第一个IP地址                return publicIp;            }        }        return null;    }    /**     * http访问url     */    private static String getUrlResult(String url) {
           StringBuilder sb = new StringBuilder();        BufferedReader in = null;        try {
               URL realUrl = new URL(url);            URLConnection connection = realUrl.openConnection();            connection.setConnectTimeout(1000);            connection.setReadTimeout(1000);            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));            String line;            while ((line = in.readLine()) != null) {
                   sb.append(line);            }        } catch (Exception e) {
   //            System.out.println(e.getMessage());            return "";        }        return sb.toString();    }}
    
   

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