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; }