Java获取请求客户端的真实IP地址-生产在用

/**
 * 获取当前网络ip
 * @param request
 * @return
 */
public String getIpAddr(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(","));
        }
    }
    
    return ipAddress;
}