How to use unmarshaljson

Writing go In the process of , Upstream is always free to transfer any type of data . This will lead to our small go This clean language reports errors when parsing parameters because the data type is wrong . therefore UnmarshalJSON The application of

Specific use ：

package main

import (
	"encoding/json"
	"fmt"
)

type App struct {
	Boottime String `json:"boottime"` // Here is the user-defined parameter type when receiving String
}
type String string

func main() {
	app := &App{}
	a := `{"boottime":1732323232}`
	err := json.Unmarshal([]byte(a),&app)
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(app)
}

// Type conversion is done here 
func (s *String) UnmarshalJSON(data []byte) error{
	*s = String(data)
	return nil
}

It's easy to implement . In fact, it is resolved to boottime Through unmarshalJson Convert types . Very good and practical