Golang 中的json.Marshal问题总结(推荐)

package main

import (
	"encoding/json"
	"fmt"
	"time"
)

type RecordBrief struct {
	time.Time
	ID int
}

func main() {
	r := RecordBrief{
		Time: time.Now(),
		ID:   6,
	}
	m, _ := json.MarshalIndent(r, "", "\t")
	fmt.Println(string(m))
}

// ...
// Marshal traverses the value v recursively.
// If an encountered value implements the Marshaler interface
// and is not a nil pointer, Marshal calls its MarshalJSON method
// to produce JSON. If no MarshalJSON method is present but the
// value implements encoding.TextMarshaler instead, Marshal calls
// its MarshalText method and encodes the result as a JSON string.
// ...
func Marshal(v interface{}) ([]byte, error) {
	...
}

type Time struct {
	...
}

// MarshalJSON implements the json.Marshaler interface.
// The time is a quoted string in RFC 3339 format, with sub-second precision added if present.
func (t Time) MarshalJSON() ([]byte, error) {
	if y := t.Year(); y < 0 || y >= 10000 {
		// RFC 3339 is clear that years are 4 digits exactly.
		// See golang.org/issue/4556#c15 for more discussion.
		return nil, errors.New("Time.MarshalJSON: year outside of range [0,9999]")
	}

	b := make([]byte, 0, len(RFC3339Nano)+2)
	b = append(b, '"')
	b = t.AppendFormat(b, RFC3339Nano)
	b = append(b, '"')
	return b, nil
}

type RecordBrief struct {
	time.Time
	ID int
}

type RecordBrief struct {
	Time time.Time
	ID int
}

type RecordBrief struct {
	time.Time
	ID int
}
func (r RecordBrief) MarshalJSON() ([]byte, error) {
	//非常简单的一种方式就是创建中间类型
	t := struct {
		Time time.Time
		ID   int
	}{
		r.Time,
		r.ID,
	}
	return json.Marshal(t)
}