How to implement the function of querying provinces and cities in Golang

In web development, querying provinces and cities is a common requirement, especially in business scenarios involving geographical location. In Golang, the function of querying provinces and cities can be easily realized by using third-party libraries. Next, this article will introduce how to query provinces and cities in Golang.

1. Use third-party libraries for query

In Golang, the function of querying provinces and cities can be implemented through third-party libraries. The following is a demonstration code for querying using beego/httplib:

``
package main

import (

"fmt"
"github.com/astaxie/beego/httplib"

)

func main() {

req := httplib.Get("http://restapi.amap.com/v3/ip?key=您的高德地图key")
str, err := req.String()
if err != nil {
    fmt.Println(err)
    return
}
fmt.Println(str)

}
``

In the above code, we use the beego/httplib library to make requests and receive the return results in string form. The URL in the code needs to be replaced with your own Amap map key. You can register and obtain the key in the Amap developer platform.

2. Parse the return result to obtain province and city information

In the previous section, we have successfully obtained the province and city information, but the return result is a string and cannot directly obtain what we need. The data. In this section, we will introduce how to parse the returned results to obtain province and city information.

The sample code is as follows:

``
package main

import (

"fmt"
"encoding/json"
"github.com/astaxie/beego/httplib"

)

type MapResult struct {

Status   string `json:"status"`
Province string `json:"province"`
City     string `json:"city"`

}

func main() {

req := httplib.Get("http://restapi.amap.com/v3/ip?key=您的高德地图key")
str, err := req.String()
if err != nil {
    fmt.Println(err)
    return
}
fmt.Println(str)

var result MapResult
err = json.Unmarshal([]byte(str), &result)
if err != nil {
    fmt.Println(err)
    return
}
fmt.Printf("当前所属省份：%s，城市：%s\n", result.Province, result.City)

}

在上述代码中，我们先定义了一个MapResult结构体用于存储返回结果中所需要的数据。接着，在获取返回结果后，通过json.Unmarshal()方法解析返回结果，并将解析后的数据存入MapResult结构体中，最终输出省份和城市信息。

三、总结

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