Go simply handles Json

{
    "servers": [
        {
            "serverName": "Shanghai_VPN", 
            "serverIP": "127.0.0.1"
        }, 
        {
            "serverName": "Beijing_VPN", 
            "serverIP": "127.0.0.2"
        }
    ]
}

Parse

func Unmarshal(data []byte, v interface{}) error

type Server struct {
    ServerName string
    ServerIP   string
}

type Serverslice struct {
    Servers []Server
}

func main() {
    var s Serverslice
    str := `{"servers":[{"serverName":"Shanghai_VPN","serverIP":"127.0.0.1"},{"serverName":"Beijing_VPN","serverIP":"127.0.0.2"}]}`
    json.Unmarshal([]byte(str), &s)
    fmt.Println(s)
}

---

Parse to interface{}

Without knowing the type of json data

• bool for JSON booleans,

• float64 for JSON numbers,

• string represents JSON strings,

• nil stands for JSON null.

  func main() { var f interface{} b := []byte() if err := json.Unmarshal(b, &f); err != nil { log.Fatalln(err) }
  
  {"Name":"Wednesday","Age":6,"Parents":["Gomez","Morticia"]}
  
  
  

  m := f.(map[string]interface{})
  for k, v := range m {
  	switch vtype := v.(type) {
  	case int:
  		fmt.Println(k, "is int: ", vtype)
  	case string:
  		fmt.Println(k, "is string: ", vtype)
  	case float64:
  		fmt.Println(k, "is float64: ", vtype)
  	case []interface{}:
  		fmt.Println(k, "is array: ", vtype)
  	default:
  		fmt.Println(k, "is unrecognized: ", vtype)
  	}
  }
  

  }

Also available simplejson package

---

generate json

func Marshal(v interface{}) ([]byte, error)

• The tag of the field is "-", then this field will not be output to JSON

• If the tag has a custom name, then the custom name will appear in the JSON field name, such as serverName in the above example

• If the tag has the "omitempty" option, then if the field value is empty, it will not be output to the JSON string

• If the field type is bool, string, int, int64, etc., and the tag contains the ",string" option, then the field will convert the corresponding value of the field into a JSON string when outputting to JSON.

  type Server struct { // ID will not be exported to JSON ID int
  
  json:"-"

  // ServerName2 的值会进行二次 JSON 编码
  ServerName  string `json:"serverName"`
  ServerName2 string `json:"serverName2,string"`
  
  // 如果 ServerIP 为空，则不输出到 JSON 串中
  ServerIP   string `json:"serverIP,omitempty"`
  

  }

  s := Server { ID: 3, ServerName: , ServerName2: , ServerIP: ``, } b, _ := json.Marshal(s) os.Stdout.Write(b)
  
  Go "1.0"
Go "1.0"
  
  
  
  

  //stdout

  {“serverName”:"Go “1.0” “,“serverName2”:”"Go “1.0” “”}

Summarize

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Since there is a lot of content, only a general outline is put on it. If you need a more detailed learning mind map, click on my Gitee to get it .
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