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package main
/**
Tag是结构体的元信息，可以在运行的时候通过反射的机制读取出来。 Tag在结构体字段的后方定义，由一对反引号包裹起来，具体的格式如下：
`key1:"value1" key2:"value2"`
*/
import (
"encoding/json"
"fmt"
)
// Student2 学生
type Student2 struct {
ID int `json:"id"` //通过指定tag实现json序列化该字段时的key
Gender string //json序列化是默认使用字段名作为key
name string //私有不能被json包访问
}
func main() {
s1 := Student2{
ID: 1,
Gender: "男",
name: "沙河娜扎",
data, err := json.Marshal(s1)
if err != nil {
fmt.Println("json marshal failed!")
return
fmt.Printf("json str:%s\n", data) //json str:{"id":1,"Gender":"男"}
