通过Marshaler和Unmarshaler接口，可以自定义序列化和反序列化时需要执行的操作。

  1. // #encoding/json/encode.go
  3. // Marshaler is the interface implemented by types that
  4. // can marshal themselves into valid JSON.
  5. type Marshaler interface {
  6.     MarshalJSON() ([]byte, error)
  7. }
  9. // #encoding/json/decode.go
  11. // Unmarshaler is the interface implemented by types
  12. // that can unmarshal a JSON description of themselves.
  13. // The input can be assumed to be a valid encoding of
  14. // a JSON value. UnmarshalJSON must copy the JSON data
  15. // if it wishes to retain the data after returning.
  16. //
  17. // By convention, to approximate the behavior of Unmarshal itself,
  18. // Unmarshalers implement UnmarshalJSON([]byte("null")) as a no-op.
  19. type Unmarshaler interface {
  20.     UnmarshalJSON([]byte) error
  21. }

TextMarshaler与Marshaler类似，优先级比Marshaler低。返回的是文本内容，不需要自己添加双引号。

  1. // #encoding/encoding.go
  3. // TextMarshaler is the interface implemented by an object that can
  4. // marshal itself into a textual form.
  5. //
  6. // MarshalText encodes the receiver into UTF-8-encoded text and returns the result.
  7. type TextMarshaler interface {
  8.     MarshalText() (text []byte, err error)
  9. }
  11. // TextUnmarshaler is the interface implemented by an object that can
  12. // unmarshal a textual representation of itself.
  13. //
  14. // UnmarshalText must be able to decode the form generated by MarshalText.
  15. // UnmarshalText must copy the text if it wishes to retain the text
  16. // after returning.
  17. type TextUnmarshaler interface {
  18.     UnmarshalText(text []byte) error
  19. }

BinaryMarshaler 是由一个对象实现的接口，它可以将自己编组为二进制形式。
MarshalBinary 将接收器编码为二进制形式并返回结果。

  1. // #encoding/encoding.go
  3. // BinaryMarshaler is the interface implemented by an object that can
  4. // marshal itself into a binary form.
  5. //
  6. // MarshalBinary encodes the receiver into a binary form and returns the result.
  7. type BinaryMarshaler interface {
  8.     MarshalBinary() (data []byte, err error)
  9. }
  11. // BinaryUnmarshaler is the interface implemented by an object that can
  12. // unmarshal a binary representation of itself.
  13. //
  14. // UnmarshalBinary must be able to decode the form generated by MarshalBinary.
  15. // UnmarshalBinary must copy the data if it wishes to retain the data
  16. // after returning.
  17. type BinaryUnmarshaler interface {
  18.     UnmarshalBinary(data []byte) error
  19. }

参考：

Golang JSON

golang json编码

Go语言中关于JSON的整理

编码 | encoding