代码如下

package main

import (
	"encoding/json"
	"fmt"
)

type User struct {
	Name  string `json:"name"`
	Email string `json:"email"`
	Age   int    `json:"age"`
}

func main() {
	//编码
	user := User{Name: "zhangsan", Email: "123@qq.com", Age: 12}
	jsonData, err := json.Marshal(user)
	if err != nil {
		fmt.Println("编码错误", err)
		return
	}
	fmt.Println("编码后的json", string(jsonData))
	//解码
	jsonString := `{"name":"lisi", "email":"fd@11.cn", "age":12}`
	var decodeUser User
	err = json.Unmarshal([]byte(jsonString), &decodeUser)
	if err != nil {
		println("解码错误", err)
		return
	}
	fmt.Printf("解码后的json %+v\n", decodeUser)

}