获取客户端IP地址

public static String getRemoteAddr(HttpServletRequest request) {
    String remoteAddr = request.getHeader("X-Real-IP");
    if (!isBlank(remoteAddr))
        remoteAddr = request.getHeader("X-Forwarded-For");
    else if (!isBlank(remoteAddr))
        remoteAddr = request.getHeader("Proxy-Client-IP");
    else if (!isBlank(remoteAddr))
        remoteAddr = request.getHeader("WL-Proxy-Client-IP");
    return 
        remoteAddr == null ?
        request.getRemoteAddr() : remoteAddr; 
}