[笔记] Golang JSON

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  1 package main
  2 
  3 import (
  4     "encoding/json"
  5     "fmt"
  6 )
  7 
  8 /*
  9 
 10 GO类型和JSON类型的对应关系
 11 • bool 代表 JSON booleans,
 12 • float64 代表 JSON numbers,
 13 • string 代表 JSON strings,
 14 • nil 代表 JSON null.
 15 
 16 三方开源库：
 17 https://github.com/bitly/go-simplejson
 18 */
 19 
 20 type Server struct {
 21     ServerName string
 22     ServerIP   string
 23 }
 24 
 25 type Serverslice struct {
 26     Servers []Server
 27 }
 28 
 29 type Server2 struct {
 30     ServerName string `json:"serverName"`
 31     ServerIP   string `json:"serverIP"`
 32 }
 33 
 34 type Serverslice2 struct {
 35     Servers []Server2 `json:"servers"`
 36 }
 37 
 38 func main() {
 39     fmt.Println("********************")
 40     jsonUnmarshal()
 41     fmt.Println("********************")
 42     jsonUnmarshal2()
 43     fmt.Println("********************")
 44     jsonMarshal()
 45     fmt.Println("********************")
 46     jsonMarshal2()
 47 }
 48 
 49 func jsonUnmarshal() {
 50     var s Serverslice
 51     str := `{"servers":
 52             [{"serverName":"Shanghai_VPN","serverIP":"127.0.0.1"},
 53             {"serverName":"Beijing_VPN","serverIP":"127.0.0.2"}]}`
 54     json.Unmarshal([]byte(str), &s)
 55     fmt.Println(s)
 56 }
 57 
 58 func jsonUnmarshal2() {
 59     b := []byte(`{"Name":"Wednesday","Age":6,"Parents":["Gomez","Morticia"]}`)
 60     var f interface{}
 61     json.Unmarshal(b, &f)
 62     m := f.(map[string]interface{})
 63     for k, v := range m {
 64         switch vv := v.(type) {
 65         case string:
 66             fmt.Println(k, "is string", vv)
 67         case int:
 68             fmt.Println(k, "is int", vv)
 69         case float64:
 70             fmt.Println(k, "is float64", vv)
 71         case []interface{}:
 72             fmt.Println(k, "is an array:")
 73             for i, u := range vv {
 74                 fmt.Println(i, u)
 75             }
 76         default:
 77             fmt.Println(k, "is of a type i don't konw how handle")
 78         }
 79     }
 80 }
 81 
 82 func jsonMarshal() {
 83     var s Serverslice
 84     s.Servers = append(s.Servers, Server{ServerName: "Shanghai_VPN", ServerIP: "127.0.0.1"})
 85     s.Servers = append(s.Servers, Server{ServerName: "Beijing_VPN", ServerIP: "127.0.0.2"})
 86     b, err := json.Marshal(s)
 87     if err != nil {
 88         fmt.Println("json err:", err)
 89     }
 90     fmt.Println(string(b))
 91 }
 92 
 93 func jsonMarshal2() {
 94     var s Serverslice2
 95     s.Servers = append(s.Servers, Server2{ServerName: "Shanghai_VPN", ServerIP: "127.0.0.1"})
 96     s.Servers = append(s.Servers, Server2{ServerName: "Beijing_VPN", ServerIP: "127.0.0.2"})
 97     b, err := json.Marshal(s)
 98     if err != nil {
 99         fmt.Println("json err:", err)
100     }
101     fmt.Println(string(b))
102 }