Go：Json转结构体

解决实际需求，案例分享。

1. 请求Zabbix API，通过itemid获取到AppName（应用集名称）

package main

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

func PostRequest(payload string, url string) {
   method := "POST"
   pl := strings.NewReader(payload)
   client := &http.Client{}
   req, err := http.NewRequest(method, url, pl)

   if err != nil {
      fmt.Println(err)
      return
   }
   req.Header.Add("Content-Type", "application/json")

   res, err := client.Do(req)
   if err != nil {
      fmt.Println(err)
      return
   }
   defer res.Body.Close()

   body, err := ioutil.ReadAll(res.Body)

   if err != nil {
      log.Println(err)
      return
   }
   fmt.Println(string(body))
}

func main() {
   const api = "http://192.168.11.11:28080/api_jsonrpc.php"
   const token = "a638200c24a8bea7f78cd5cabf3d1dd5"
   const itemid = "33918"

   a := fmt.Sprintf(`{
      "jsonrpc": "2.0",
      "method": "application.get",
      "params": {"itemids": "%s"},
      "auth": "%s","id": 2
      }`, itemid, token)

   PostRequest(a, api)
}

响应结果：

{"jsonrpc":"2.0","result":[{"applicationid":"1574","hostid":"10354","name":"TEST","flags":"0","templateids":[]}],"id":2}

2. 将响应结果（json）转结构体，方便取值

在原来代码的基础上，继续编码。

package main

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

type resultInfo struct {
   Applicationid string   `json:"applicationid"`
   Hostid        string   `json:"hostid"`
   Name          string   `json:"name"`
   Flags         string   `json:"flags"`
   Templateids   []string `json:"templateids"`
}

type resultArr []resultInfo

type Response struct {
   Jsonrpc string    `json:"jsonrpc"`
   Result  resultArr `json:result`
   Id      int       `json:"id"`
}

type Byte []byte

func JsonConvertStruct(body Byte) {
   var response Response
   json.Unmarshal([]byte(body), &response)
   fmt.Println(response.Result[0].Name)
}

func PostRequest(payload string, url string) {
   method := "POST"
   pl := strings.NewReader(payload)
   client := &http.Client{}
   req, err := http.NewRequest(method, url, pl)

   if err != nil {
      fmt.Println(err)
      return
   }
   req.Header.Add("Content-Type", "application/json")

   res, err := client.Do(req)
   if err != nil {
      fmt.Println(err)
      return
   }
   defer res.Body.Close()

   body, err := ioutil.ReadAll(res.Body)

   if err != nil {
      log.Println(err)
      return
   }
   JsonConvertStruct(body)
}

func main() {
   const api = "http://192.168.11.11:28080/api_jsonrpc.php"
   const token = "a638200c24a8bea7f78cd5cabf3d1dd5"
   const itemid = "33918"

   a := fmt.Sprintf(`{
      "jsonrpc": "2.0",
      "method": "application.get",
      "params": {"itemids": "%s"},
      "auth": "%s","id": 2
      }`, itemid, token)

   PostRequest(a, api)
}

结果：

TEST

3. 来自最好的总结

人生苦短，建议你还是用python吧！

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