首次提交：初始化项目代码

json/json_demo_3.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+)
+
+// CustomTime 自定义时间类型
+type CustomTime time.Time
+
+const timeLayout = "2006-01-02 15:04:05"
+
+func (t CustomTime) MarshalJSON() ([]byte, error) {
+	return json.Marshal(time.Time(t).Format(timeLayout))
+}
+
+func (t *CustomTime) UnmarshalJSON(data []byte) error {
+	var timeStr string
+	if err := json.Unmarshal(data, &timeStr); err != nil {
+		return err
+	}
+	val, err := time.Parse(timeLayout, timeStr)
+	if err != nil {
+		return err
+	}
+	*t = CustomTime(val)
+	return nil
+}
+
+// Mobile 手机号脱敏
+type Mobile string
+
+func (m Mobile) MarshalJSON() ([]byte, error) {
+	num := string(m)
+	if len(num) == 11 {
+		return json.Marshal(num[:3] + "****" + num[7:])
+	}
+	return json.Marshal(num)
+}
+
+// UserDTO 数据传输对象
+type UserDTO struct {
+	Name     string     `json:"name"`
+	Phone    Mobile     `json:"phone"`
+	CreateAt CustomTime `json:"create_at"`
+}
+
+func main() {
+	dto := UserDTO{
+		Name:     "bulma",
+		Phone:    Mobile("10012345678"),
+		CreateAt: CustomTime(time.Now()),
+	}
+	data, _ := json.MarshalIndent(dto, "", "  ")
+	fmt.Println("\n=== 自定义序列化结果 ===")
+	fmt.Println(string(data))
+}