c#实现根据网络IP显示地理位置功能示例

用户信息表，是大多数系统都有的。我们也知道，通常都会有类似 注册ip 和 最后登录ip 这两个的字段，来存储用户注册时候的ip地址和最后登录的ip的地址。

获取这样的地址，在后台显示 xxx.xxx.xxx.xxx 的地址段，让人看到很不自然，根本就不知道具体地理位置。

现在我们就简单的实现一下这个功能。
用到了读取纯真ip数据库的公用组件qqwry.net 这个组件，作者阿不。（谢谢他的共享）
还要去下载最新的纯真ip地址库，下载获得qqwry.dat
最后请出js中的小靓妞，jquery-1.3.1.js
新建web项目ajaxip，将qqwry.dat添加到app_data下。
然后添加qqwry.net的组件类，如下：

code highlighting produced by actipro codehighlighter (freeware)http://www.codehighlighter.com/--> 1 using system;
using system.collections.generic;
using system.text;
using system.io;
using system.text.regularexpressions;
using system.net;
using system.net.sockets;
namespace ajaxip
{
public class iplocation
{
public string ip { get; set; }
public string country { get; set; }
public string local { get; set; }
}
public class qqwrylocator
{
static encoding encoding = encoding.getencoding("gb2312");
private byte[] data;
int firststartipoffset;
int laststartipoffset;
int ipcount;
public int count { get { return ipcount; } }
public qqwrylocator(string datapath)
{
using (filestream fs = new filestream(datapath, filemode.open, fileaccess.read, fileshare.read))
{
data = new byte[fs.length];
fs.read(data, 0, data.length);
}
firststartipoffset = (int)data[0] + (((int)data[1]) << 8) + (((int)data[2]) << 16) + (((int)data[3]) << 24);
laststartipoffset = (int)data[4] + (((int)data[5]) << 8) + (((int)data[6]) << 16) + (((int)data[7]) << 24);
ipcount = (laststartipoffset - firststartipoffset) / 7 + 1;
if (ipcount <= 1)
{
throw new argumentexception("ip filedataerror");
}
}
public static uint iptoint(string ip)
{
//string[] strarray = ip.split('.');
//return (uint.parse(strarray[0]) << 24) + (uint.parse(strarray[1]) << 16) + (uint.parse(strarray[2]) << 8) + uint.parse(strarray[0]);
//return (uint)ipaddress.hosttonetworkorder((int)(ipaddress.parse(ip).address));
byte[] bytes = ipaddress.parse(ip).getaddressbytes();
return (uint)bytes[3] + (((uint)bytes[2]) << 8) + (((uint)bytes[1]) << 16) + (((uint)bytes[0]) << 24);
}
public static string inttoip(uint ip_int)
{
return new ipaddress(ip_int).tostring();
}
public iplocation query(string ip)
{
ipaddress address = ipaddress.parse(ip);
if (address.addressfamily != addressfamily.internetwork)
{
throw new argumentexception("不支持非ipv4的地址");
}
if (ipaddress.isloopback(address))
{
return new iplocation() { ip = ip, country = "本机内部环回地址", local = string.empty };
}
uint intip = (uint)ipaddress.hosttonetworkorder((int)address.address);
//if ((((intip >= iptoint("0.0.0.0")) && (intip <= iptoint("2.255.255.255"))) || ((intip >= iptoint("64.0.0.0")) && (intip <= iptoint("126.255.255.255")))) ||
//((intip >= iptoint("58.0.0.0")) && (intip <= iptoint("60.255.255.255"))))
//if (intip <= 50331647 || (intip >= 1073741824 && intip <= 2130706431) || (intip >= 973078528 && intip <= 1023410175))
//{
// return new iplocation() { ip = ip, country = "网络保留地址", local = string.empty };
//}
iplocation iplocation = new iplocation() { ip = ip };
uint right = (uint)ipcount;
uint left = 0;
uint middle = 0;
uint startip = 0;
uint endipoff = 0;
uint endip = 0;
int countryflag = 0;
while (left < (right - 1))
{
middle = (right + left) / 2;
startip = getstartip(middle, out endipoff);
if (intip == startip)
{
left = middle;
break;
}
if (intip > startip)
{
left = middle;
}
else
{
right = middle;
}
}
startip = getstartip(left, out endipoff);
endip = getendip(endipoff, out countryflag);
if ((startip <= intip) && (endip >= intip))
{
string local;
iplocation.country = getcountry(endipoff, countryflag, out local);
iplocation.local = local;
}
else
{
iplocation.country = "未知";
iplocation.local = string.empty;
}
return iplocation;
}
private uint getstartip(uint left, out uint endipoff)
{
int leftoffset = (int)(firststartipoffset + (left * 7));
endipoff = (uint)data[4 + leftoffset] + (((uint)data[5 + leftoffset]) << 8) + (((uint)data[6 + leftoffset]) << 16);
return (uint)data[leftoffset] + (((uint)data[1 + leftoffset]) << 8) + (((uint)data[2 + leftoffset]) << 16) + (((uint)data[3 + leftoffset]) << 24);
}
private uint getendip(uint endipoff, out int countryflag)
{
countryflag = data[4 + endipoff];
return (uint)data[endipoff] + (((uint)data[1 + endipoff]) << 8) + (((uint)data[2 + endipoff]) << 16) + (((uint)data[3 + endipoff]) << 24);
}
/// <summary>
/// gets the country.
/// </summary>
/// <param name="endipoff">the end ip off.</param>
/// <param name="countryflag">the country flag.</param>
/// <param name="local">the local.</param>
/// <returns>country</returns>
private string getcountry(uint endipoff, int countryflag, out string local)
{
string country = string.empty;
uint offset = endipoff + 4;
switch (countryflag)
{
case 1:
case 2:
country = getflagstr(ref offset, ref countryflag, ref endipoff);
offset = endipoff + 8;
local = (1 == countryflag) ? string.empty : getflagstr(ref offset, ref countryflag, ref endipoff);
break;
default:
country = getflagstr(ref offset, ref countryflag, ref endipoff);
local = getflagstr(ref offset, ref countryflag, ref endipoff);
break;
}
return country;
}
private string getflagstr(ref uint offset, ref int countryflag, ref uint endipoff)
{
int flag = 0;
while (true)
{
flag = data[offset];
//没有重定向
if (flag != 1 && flag != 2)
{
break;
}
if (flag == 2)
{
countryflag = 2;
endipoff = offset - 4;
}
offset = (uint)data[1 + offset] + (((uint)data[2 + offset]) << 8) + (((uint)data[3 + offset]) << 16);
}
if (offset < 12)
{
return string.empty;
}
return getstr(ref offset);
}
/// <summary>
/// 读取字符串...
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
private string getstr(ref uint offset)
{
byte lowbyte = 0;
byte highbyte = 0;
stringbuilder stringbuilder = new stringbuilder(16);
while (true)
{
lowbyte = data[offset++];
if (lowbyte == 0)
{
return stringbuilder.tostring();
}
if (lowbyte > 0x7f)
{
highbyte = data[offset++];
if (highbyte == 0)
{
return stringbuilder.tostring();
}
stringbuilder.append(encoding.getstring(new byte[] { lowbyte, highbyte }));
}
else
{
stringbuilder.append((char)lowbyte);
}
}
}
}
}

再来新建 ipsearch.ashx 文件，如下：

code highlighting produced by actipro codehighlighter (freeware)http://www.codehighlighter.com/--> 1 using system;
using system.collections;
using system.data;
using system.linq;
using system.web;
using system.web.services;
using system.web.services.protocols;
using system.xml.linq;
namespace ajaxip
{
/// <summary>
/// ip查询 的摘要说明
/// </summary>
public class ipsearch : ihttphandler
{
public void processrequest(httpcontext context)
{
context.response.contenttype = "text/plain";
string ip = context.request["ip"];
string ipfilepath = @"\app_data\qqwry.dat";
qqwrylocator qqwry = new qqwrylocator(ipfilepath);
iplocation loc = qqwry.query(ip);
context.response.write(string.format("{0} {1}",loc.country,loc.local));
}
public bool isreusable
{
get
{
return false;
}
}
}
}

最后在default.aspx页面写下，js和有ip的用户信息，如下：

code highlighting produced by actipro codehighlighter (freeware)http://www.codehighlighter.com/--> 1 <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
<script language="javascript" src="js/jquery-1.3.1.js"></script>
<script language="javascript">
$(document).ready(function() {
$("#tb tr").each(function() {
var obj = $(this).children("td:eq(2)");
searchip(obj);
});
})
function searchip(obj) {
$.ajax({
type: "get",
url: "ipsearch.ashx?ip=" + obj.text(),
success: function(data) {
obj.text(data);
}
});
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table id="tb" style="width:100%;">
<thead>
<th>321321</th>
<th>321321</th>
<th>321321</th>
</thead>
<tr>
<td>
omega</td>
<td>
0</td>
<td>
122.229.191.8</td>
</tr>
<tr>
<td>
荒年</td>
<td>
900,000</td>
<td>
110.87.98.30</td>
</tr>
<tr>
<td>
寒妃</td>
<td>
1,854,257,979</td>
<td>
220.188.193.72</td>
</tr>
<tr>
<td>
哈小土</td>
<td>
600,100</td>
<td>
220.188.193.72</td>
</tr>
<tr>
<td>
化妆造型</td>
<td>
400,100</td>
<td>
220.188.193.72</td>
</tr>
</table>
</div>
</form>
</body>
</html>

这样我们的后台用户信息不再是不友好的ip地址段了。
运行一下，看看效果吧.