package main

                                        import (
                                            "encoding/json"
                                            "encoding/xml"
                                            "fmt"
                                            "io/ioutil"
                                            "net/http"
                                        )

                                        const (
                                            URL   = "http://api.ip138.com/query/"
                                            TOKEN = "bd4c2bf9a38ab06f7cae88c9759ee172"
                                        )

                                        //----------------------------------
                                        // iP地址调用示例代码
                                        //----------------------------------

                                        // xml struct
                                        type xmlinfo struct {
                                            Ret  string          `xml:"ret"`
                                            Ip   string          `xml:"ip"`
                                            Data locationxmlInfo `xml:"data"`
                                        }

                                        type locationxmlInfo struct {
                                            Country string `xml:"country"`
                                            Region  string `xml:"region"`
                                            City    string `xml:"city"`
                                            Isp     string `xml:"isp"`
                                            Zip     string `xml:"zip"`
                                            Zone    string `xml:zone`
                                        }

                                        //json struct
                                        type jsoninfo struct {
                                            Ret  string    `json:"ret"`
                                            Ip   string    `json:"ip"`
                                            Data [6]string `json:"data"`
                                        }

                                        func main() {
                                            ipLocation("8.8.8.8","xml")
                                        }

                                        func ipLocation(ip string,dataType string) {

                                            queryUrl := fmt.Sprintf("%s?ip=%s&datatype=%s",URL,ip,dataType)
                                            client := &http.Client{}
                                            reqest, err := http.NewRequest("GET",queryUrl,nil)

                                            if err != nil {
                                                fmt.Println("Fatal error ",err.Error())
                                            }

                                            reqest.Header.Add("token",TOKEN)
                                            response, err := client.Do(reqest)
                                            defer response.Body.Close()

                                            if err != nil {
                                                fmt.Println("Fatal error ",err.Error())
                                            }
                                            if response.StatusCode == 200 {
                                                bodyByte, _ := ioutil.ReadAll(response.Body)

                                                if dataType == "jsonp" {
                                                    var info jsoninfo
                                                    json.Unmarshal(bodyByte,&info)
                                                    fmt.Println(info.Ip)
                                                } else if dataType == "xml" {
                                                    var info xmlinfo
                                                    xml.Unmarshal(bodyByte,&info)
                                                    fmt.Println(info.Ip)
                                                }
                                            }

                                            return
                                        }