Golang反射调试技巧 输出反射对象信息

String()

obj := "hello"
t := reflect.TypeOf(obj)
v := reflect.ValueOf(obj)

fmt.Printf("Type: %s\n", t.String())     // 输出: string
fmt.Printf("Kind: %s\n", t.Kind())       // 输出: string
fmt.Printf("Value: %v\n", v)             // 输出: hello

Ptr

ptr := &struct{Name string}{"Alice"}
v := reflect.ValueOf(ptr)

if v.Kind() == reflect.Ptr {
    elem := v.Elem()
    fmt.Printf("Pointer to Type: %s\n", elem.Type())
    fmt.Printf("Field: %s = %v\n", elem.Type().Field(0).Name, elem.Field(0))
}

Pointer to Type: struct { Name string }
Field: Name = Alice

type User struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

u := User{Name: "Bob", Age: 25}
v := reflect.ValueOf(u)
t := reflect.TypeOf(u)

for i := 0; i < v.NumField(); i++ {
    field := t.Field(i)
    value := v.Field(i)
    tag := field.Tag.Get("json")
    fmt.Printf("Field: %s, Type: %s, Value: %v, json tag: %s\n",
        field.Name, field.Type, value, tag)
}

v := reflect.ValueOf(u)
fmt.Printf("CanSet: %v\n", v.Field(0).CanSet()) // false，因为 u 是值类型

v = reflect.ValueOf(&u).Elem()
fmt.Printf("CanSet: %v\n", v.Field(0).CanSet()) // true

fmt.Printf("Reflect Value: %+v\n", reflect.ValueOf(u))
fmt.Printf("Reflect Type: %+v\n", reflect.TypeOf(u))