Golang中Json的序列化和反序列化的使用

func testBasic() {
	num := 1.111
	marshal, err := json.Marshal(num)
	if err != nil {
		fmt.Println("json.Marshal err:", err)
	}
	fmt.Println("序列化后：", string(marshal)) // 序列化后： 1.111
}

func main() {
	testStudent()
}

// 如果加上`json:"student_name"`，序列化以后的数据字段是返回指定格式的，可以小写，json固定，后面的随意
type Student struct {
	// 变量首字母大写才能被解析
	Name     string `json:"student_name"`
	Age      int    `json:"student_age"`
	Birthday string `json:"student_birthday"`
	Address  string `json:"student_address"`
}


func testStudent() {
	student := Student{
		Name:     "itzhuzhu",
		Age:      24,
		Birthday: "1998-01-01",
		Address:  "广州市天河区",
	}
	marshal, err := json.Marshal(&student)
	if err != nil {
		fmt.Println("json.Marshal err:", err)
	}
	fmt.Println("序列化后：", string(marshal)) // 序列化后：{"Name":"itzhuzhu","Age":24,"Birthday":"1998-01-01","Address":"广州市天河区"}
}

func testMap() {
	var m map[string]interface{}
	m = make(map[string]interface{})
	m["name"] = "韩信"
	m["age"] = 23
	m["address"] = "广州"

	marshal, err := json.Marshal(m)
	if err != nil {
		fmt.Println("json.Marshal err:", err)
	}
	fmt.Println("序列化后：", string(marshal)) // 序列化后： {"address":"广州","age":23,"name":"韩信"}
}

func testSlice() {
	var slice []map[string]interface{}
	var m map[string]interface{}
	m = make(map[string]interface{})
	m["name"] = "韩信"
	m["age"] = 23
	m["address"] = "广州"
	slice = append(slice, m)
	marshal, err := json.Marshal(m)
	if err != nil {
		fmt.Println("json.Marshal err:", err)
	}
	fmt.Println("序列化后：", string(marshal)) // 序列化后： {"address":"广州","age":23,"name":"韩信"}
}

func deserialize() {
	str := "{\"Name\":\"itzhuzhu\",\"Age\":24,\"Birthday\":\"1998-01-01\",\"Address\":\"广州市天河区\"}"

	// 使用Unmarshal反序列化
	var student Student
	err := json.Unmarshal([]byte(str), &student)
	if err != nil {
		fmt.Println("json.Unmarshal err:", err)
	}

	fmt.Println("反序列化后：", student) // 反序列化后： {itzhuzhu 24 1998-01-01 广州市天河区}
}

func deserializeMap() {
	str := " {\"address\":\"广州\",\"age\":23,\"name\":\"韩信\"}"

	// 反序列化的时候不需要make，被封装到Unmarshal中了
	var m map[string]interface{}

	err := json.Unmarshal([]byte(str), &m)
	if err != nil {
		fmt.Println("json.Unmarshal err:", err)
	}

	fmt.Println("反序列化后：", m) // map[address:广州 age:23 name:韩信]
}

func deserializeSlice() {
	str := " [{\"address\":\"广州\",\"age\":23,\"name\":\"韩信\"}]"

	var slice []map[string]interface{}

	err := json.Unmarshal([]byte(str), &slice)
	if err != nil {
		fmt.Println("json.Unmarshal err:", err)
	}

	fmt.Println("反序列化后：", slice) // 反序列化后： [map[address:广州 age:23 name:韩信]]
}