如何使用 Golang 反射实现通用打印函数_Golang 动态类型输出与格式控制

var x int = 42
t := reflect.TypeOf(x)      // t.Name() == "int"
v := reflect.ValueOf(x)     // v.Kind() == reflect.Int

func PrintGeneric(v interface{}) {
    val := reflect.ValueOf(v)
    typ := reflect.TypeOf(v)

    switch val.Kind() {
    case reflect.String:
        fmt.Printf("字符串: %q\n", val.String())
    case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
        fmt.Printf("整数: %d\n", val.Int())
    case reflect.Float32, reflect.Float64:
        fmt.Printf("浮点数: %.2f\n", val.Float())
    case reflect.Bool:
        fmt.Printf("布尔值: %t\n", val.Bool())
    default:
        fmt.Printf("未知类型 [%s]: %v\n", typ, v)
    }
}

case reflect.Slice:
    fmt.Print("切片 [")
    for i := 0; i < val.Len(); i++ {
        if i > 0 { fmt.Print(", ") }
        PrintGeneric(val.Index(i).Interface())
    }
    fmt.Println("]")
case reflect.Struct:
    fmt.Printf("结构体 %s {\n", typ.Name())
    for i := 0; i < val.NumField(); i++ {
        field := typ.Field(i)
        value := val.Field(i)
        fmt.Printf("  %s: ", field.Name)
        PrintGeneric(value.Interface())
    }
    fmt.Println("}")

type Person struct {
    Name string `display:"show"`
    Age  int    `display:"hide"`
}

tag := typ.Field(i).Tag.Get("display")
if tag == "hide" {
    continue // 跳过该字段
}