首次提交：初始化项目代码

json/json_demo_1.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// User 基础数据模型
+type User struct {
+	ID       int64  `json:"user_id"`
+	Username string `json:"username"`
+	Age      int    `json:"age"`
+}
+
+func main() {
+	// 序列化：Go → JSON
+	user := User{ID: 1001, Username: "bulma_admin", Age: 26}
+	jsonData, err := json.MarshalIndent(user, "", "  ")
+	if err != nil {
+		fmt.Printf("序列化失败：%v\n", err)
+		return
+	}
+	fmt.Println("=== 序列化结果 ===")
+	fmt.Println(string(jsonData))
+
+	// 反序列化：JSON → Go
+	jsonStr := `{"user_id":1002,"username":"json_test","age":28}`
+	var newUser User
+	if err := json.Unmarshal([]byte(jsonStr), &newUser); err != nil {
+		fmt.Printf("反序列化失败：%v\n", err)
+		return
+	}
+	fmt.Println("\n=== 反序列化结果 ===")
+	fmt.Printf("%+v\n", newUser)
+}

json/json_demo_2.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"encoding/json"
+	fmt "fmt"
+)
+
+// BaseModel 公共基础模型
+type BaseModel struct {
+	ID        int64  `json:"id,string,omitempty"`
+	CreatedAt string `json:"created_at,omitempty"`
+}
+
+// Order 订单模型（全标签演示）
+type Order struct {
+	BaseModel `json:",inline"`
+	OrderNo   string `json:"order_no"`
+	Status    int    `json:"status,omitempty"`
+	Phone     int64  `json:"phone,string,omitempty"`
+	Password  string `json:"-"`
+	Extra     struct {
+		Level int `json:"level"`
+	} `json:",nosquash"`
+	Ignore string `json:",allowunknown"`
+}
+
+func main() {
+	order := Order{
+		BaseModel: BaseModel{ID: 202606001, CreatedAt: "2026-06-02"},
+		OrderNo:   "BULMA-ORDER-001",
+		Password:  "secret_123",
+	}
+	data, _ := json.MarshalIndent(order, "", "  ")
+	fmt.Println("\n=== 高级标签运行结果 ===")
+	fmt.Println(string(data))
+
+	// 演示 allowunknown 的反序列化功能
+	fmt.Println("\n=== 反序列化测试（含未知字段）===")
+	jsonWithUnknown := `{
+		"id": "202606002",
+		"created_at": "2026-06-02",
+		"order_no": "BULMA-ORDER-002",
+		"unknown_field": "test",
+		"extra_field": 123
+	}`
+	var newOrder Order
+	err := json.Unmarshal([]byte(jsonWithUnknown), &newOrder)
+	if err != nil {
+		fmt.Printf("反序列化失败：%v\n", err)
+	} else {
+		fmt.Printf("成功解析：%+v\n", newOrder)
+	}
+
+	// 演示 omitempty 的效果
+	fmt.Println("\n=== omitempty 效果对比 ===")
+	emptyOrder := Order{
+		BaseModel: BaseModel{ID: 0}, // ID 为 0，会被 omit
+		OrderNo:   "BULMA-ORDER-003",
+	}
+	data2, _ := json.MarshalIndent(emptyOrder, "", "  ")
+	fmt.Println(string(data2))
+}

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))
+}

json/json_demo_4.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+// Product 大数据模型
+type Product struct {
+	SKU   string  `json:"sku"`
+	Price float64 `json:"price"`
+}
+
+func main() {
+	// 流式写入
+	file, _ := os.Create("json/bulma_products.json")
+	defer file.Close()
+	enc := json.NewEncoder(file)
+	for i := 1; i <= 5000; i++ {
+		_ = enc.Encode(Product{
+			SKU:   fmt.Sprintf("BULMA%05d", i),
+			Price: 99.9,
+		})
+	}
+	fmt.Println("\n流式写入完成")
+
+	// 流式读取
+	rf, _ := os.Open("json/bulma_products.json")
+	defer rf.Close()
+	dec := json.NewDecoder(rf)
+	count := 0
+	for dec.More() {
+		var p Product
+		_ = dec.Decode(&p)
+		count++
+	}
+	fmt.Printf("流式解析完成，总数：%d\n", count)
+}