Reference: [1] https://www.mkyong.com/regular-expressions/how-to-validate-ip-address-with-regular-expression/ import java.util.regex.Matcher; import java.util.regex.Pattern; public class IPAddressValidator{ private Pattern pattern; private Matcher ma…

In this tutorial, we show you how to convert an IP address to its decimal equivalent in Java, and vice versa. For examples : Bash 255.255.255.255 <-> 4294967295 192.168.1.2 <-> 3232235778 1. IP Address to Decimal We show you two ways to conver…

public string GetUserIp() { var visitorsIpAddr = string.Empty; if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null) { visitorsIpAddr = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FOR…

正则表达式的本质是使用一系列特殊字符模式,来表示某一类字符串.正则表达式无疑是处理文本最有力的工具,而.NET的System.dll类库提供的System.Text.RegularExpressions.Regex类实现了验证正则表达式的方法.Regex 类表示不可变(只读)的正则表达式.它还包含各种静态方法,允许在不显式创建其他类的实例的情况下使用其他正则表达式类. 正则表达式的字符代表的说明: Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN…

本文转自:http://www.codeproject.com/Articles/28363/How-to-convert-IP-address-to-country-name   Download source code - 1.11 MB How to retrieve a visitor's IP address Every visitor to your site or web application has an IP address. It is quite handy to be…

The InetAddress class can be used to perform Domain Name Server (DNS) lookups. For example, you can call the static InetAddress.getByName("www.teamcakes.com") to retrieve an InetAddress object for 'www.teamcakes.com'. This object would contain t…

在Java编程中,如何从IP地址查询出主机名? 以下示例显示了如何通过net.InetAddress类的InetAddress.getByName()方法将指定的IP地址查到主机名称. package com.yiibai; import java.net.InetAddress; public class HostSpecificByIP { public static void main(String[] argv) throws Exception { InetAddress addr =…

传送门:http://acm.tzc.edu.cn/acmhome/problemdetail.do?&method=showdetail&id=4413 时间限制(普通/Java):1000MS/3000MS     内存限制:65536KByte 描述 An IP address can be described as dotted decimal string format or 32-bit binary number format. Now, given an IP addres…

原文:http://blog.csdn.net/chwshuang/article/details/78027873?locationNum=10&fps=1 Java使用纯真IP库获取IP对应省份和城市 项目上接到一个需求,按照用户IP地址判断用户省份.城市,来展示不同的内容.在网上进行选型的时候,有几个选择 开源免费的IP库选型 GeoIP2 GeoLite2开源免费的数据库 MaxMind作为一家私营企业,总部设于美国马萨诸塞州的沃尔瑟姆.MaxMind公司成立于2002年,是领先业界的I…

一.Description Suppose you are reading byte streams from any device, representing IP addresses. Your task is to convert a 32 characters long sequence of '1s' and '0s' (bits) to a dotted decimal format. A dotted decimal format for an IP address is form…