> For the complete documentation index, see [llms.txt](https://yangsx95.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yangsx95.gitbook.io/notes/programming-language/golang/shu-ju-ge-shi-yu-bian-ma/shi-yong-encoding-bao-cao-zuo-json.md).

# 使用encoding包操作json

## 序列化与反序列化

```go
package main

import (
	"encoding/json"
	"fmt"
	"log"
)

type Movie struct {
	Title  string // 只有导出的结构体才会被编码，必须使用大写字母开头
	Year   int    `json:"released"`        // 结构体成员Tag。  类似注解，代表 Year 这个字段，转换为json时，使用 released
	Color  bool   `json:"color,omitempty"` // omitempty表示，如果该成员值为零值，则忽略该json字段
	Actors []string
}

func main() {
	var movies []Movie = []Movie{
		{Title: "Casablanca", Year: 1942, Color: false, Actors: []string{"Humphrey Bogart", "Ingrid Bergman"}},
		{Title: "Cool Hand Luke", Year: 1967, Color: true, Actors: []string{"Paul Newman"}},
		{Title: "Bullitt", Year: 1968, Color: true, Actors: []string{"Steve McQueen", "Jacqueline Bisset"}},
	}

	// 序列化
	//jsonBytes, err := json.Marshal(movies)
	jsonBytes, err := json.MarshalIndent(movies, "", "    ") //格式化
	if err != nil {
		log.Fatalf("解析失败, %v", err)
		return
	}

	fmt.Printf("%s\n\n", jsonBytes)

	// 反序列化
	newMovie := make([]Movie, 0)
	err = json.Unmarshal(jsonBytes, &newMovie)
	if err != nil {
		return
	}
	fmt.Printf("%#v\n\n", newMovie)
}
```

## 日期格式化解决方案

\*\*方式一：\*\*通过类型别名自定义时间类型，并重写JSON序列化方法

```go
type JsonTime time.Time

// 实现它的json序列化方法
func (this JsonTime) MarshalJSON() ([]byte, error) {
	var stamp = fmt.Sprintf("\"%s\"", time.Time(this).Format("2006-01-02 15:04:05"))
	return []byte(stamp), nil
}

type Student1 struct {
	Name  string   `json:"name"`
	Brith JsonTime `json:"brith"`
}

func main() {

	stu1 := Student1{
		Name:  "qiangmzsx",
		Brith: JsonTime(time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local)),
	}
	b1, err := json.Marshal(stu1)
	if err != nil {
		println(err)
	}

	println(string(b1)) //{"name":"qiangmzsx","brith":"1993-01-01 20:08:23"}
}

```


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