Java获取IP，如何获取到访客的真实公网ip

// 获取访问者的IP
public static String getIpAddress(HttpServletRequest request) {
    String ip = null;
    // X-Forwarded-For：Squid 服务代理
    String ipAddresses = request.getHeader("X-Forwarded-For");
    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        // Proxy-Client-IP：apache 服务代理
        ipAddresses = request.getHeader("Proxy-Client-IP");
    }
    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        // WL-Proxy-Client-IP：weblogic 服务代理
        ipAddresses = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        // HTTP_CLIENT_IP：有些代理服务器
        ipAddresses = request.getHeader("HTTP_CLIENT_IP");
    }
    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        // X-Real-IP：nginx服务代理
        ipAddresses = request.getHeader("X-Real-IP");
    }
    // 有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
    if (ipAddresses != null && ipAddresses.length() != 0) {
        ip = ipAddresses.split(",")[0];
    }
    // 还是不能获取到，最后再通过request.getRemoteAddr();获取
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        ip = request.getRemoteAddr();
    }
    return ip.equals("0:0:0:0:0:0:0:1") ? "127.0.0.1" : ip;
}

// 获取自己本机电脑的所有IP
public static List getMyAddress() {
    List rs = new ArrayList();
    try {
        Enumeration en = NetworkInterface.getNetworkInterfaces();//获取本地所有网络接口
        while (en.hasMoreElements()) {//遍历枚举中的每一个元素
            NetworkInterface ni= (NetworkInterface) en.nextElement();
            Enumeration
         enumInetAddr = ni.getInetAddresses(); while (enumInetAddr.hasMoreElements()) { InetAddress inetAddress = (InetAddress) enumInetAddr.nextElement(); if (!inetAddress.isLoopbackAddress() && !inetAddress.isLinkLocalAddress() && inetAddress.isSiteLocalAddress()) { // sb.append("name:" + inetAddress.getHostName().toString() + "\n"); rs.add(inetAddress.getHostAddress().toString()); } } } } catch (SocketException e) {} return rs; }