获取客户端IP

public static String getClientIP(HttpServletRequest request){
    String ip=request.getHeader("x-forwarded-for");
    if(ip==null||ip.length()==0||ip.equalsIgnoreCase("unknown")){
        ip=request.getHeader("Proxy-Client-IP");
    }
    if(ip==null||ip.length()==0||ip.equalsIgnoreCase("unknown")){
        ip=request.getHeader("WL-Proxy-Client-IP");
    }
    if(ip==null||ip.length()==0||ip.equalsIgnoreCase("unknown")){
        ip=request.getRemoteAddr();
    }
    if (ip !=null){
        ip = ip.split(",")[0];
    }
    return ip;
}