实现原理：

• 利用 淘宝获取买家IP信息 的数据接口

代码实例：

package main

import (
    "bytes"
    "io"
    "net/http"
    "time"
)

func main() {
    println(IP_Info(`119.29.29.29`))
}

// 获取IP地址
// 参数：IP地址
// 返回：IP地址的信息（格式：字符串的json）
func IP_Info(ip string) string {
    client := http.Client{Timeout: 5 * time.Second}
    resp, err := client.Get(`http://ip.taobao.com/service/getIpInfo.php?ip=` + ip)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()
    var buffer [512]byte
    result := bytes.NewBuffer(nil)
    for {
        n, err := resp.Body.Read(buffer[0:])
        result.Write(buffer[0:n])
        if err != nil && err == io.EOF {
            break
        } else if err != nil {
            panic(err)
        }
    }
    return result.String()
}

返回数据：

{
    "code": 0,
    "data": {
        "ip": "119.29.29.29",
        "country": "中国",
        "area": "",
        "region": "北京",
        "city": "北京",
        "county": "XX",
        "isp": "腾讯",
        "country_id": "CN",
        "area_id": "",
        "region_id": "110000",
        "city_id": "110100",
        "county_id": "xx",
        "isp_id": "1000401"
    }
}