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  • Go-json解析时间格式

    需要自己实现 MarshalJSONUnmarshalJSON方法,如果只需要存或者取,实现一个也可

    type Date struct {
    	time.Time
    }
    
    func (d *Date) MarshalJSON() ([]byte, error) {
    	return []byte(fmt.Sprintf(`"%s"`, d.Format("2006-01-02"))), nil
    }
    
    func (d *Date) UnmarshalJSON(b []byte) error {
    	var err error
    	// 指定时区
    	d.Time, err = time.ParseInLocation(`"2006-01-02"`, string(b),time.Local)
    	if err != nil {
    		return err
    	}
    	return nil
    }
    
    type Datetime struct {
    	time.Time
    }
    
    func (d *Datetime) MarshalJSON() ([]byte, error) {
    	return []byte(fmt.Sprintf("%s", d.Format("2006-01-02 15:04:05"))), nil
    }
    
    func (d *Datetime) UnmarshalJSON(b []byte) error {
    	var err error
    	d.Time, err = time.Parse(`"2006-01-02 15:04:05"`, string(b))
    	if err != nil {
    		return err
    	}
    	return nil
    }
    

    测试

    type Amazing struct {
    	D Date `json:"data"`
    }
    
    func main() {
    	demo := &Amazing{}
    	_ = json.Unmarshal([]byte(`{"data":"2021-03-30"}`), demo)
    	fmt.Println(demo) // &{2021-03-30 00:00:00 +0800 CST}
    
    	demo2 := &Amazing{D: Date{time.Now()}}
    	v, _ := json.Marshal(demo2)
    	fmt.Println(string(v)) // {"data":"2021-03-30"}
    }
    

    进阶,配合gorm

    type Date time.Time
    
    func (d *Date) Scan(value interface{}) (err error) {
    	nullTime := &sql.NullTime{}
    	err = nullTime.Scan(value)
    	*d = Date(nullTime.Time)
    	return
    }
    
    func (d Date) Value() (driver.Value, error) {
    	y, m, dd := time.Time(d).Date()
    	// time.Local 本地时区,如果使用 time.time(d).Location() 有可能为空切换到UTC时区
    	return time.Date(y, m, dd, 0, 0, 0, 0, time.Local), nil
    }
    
    // GormDataType gorm common data type
    func (d Date) GormDataType() string {
    	return "date"
    }
    
    func (d *Date) MarshalJSON() ([]byte, error) {
    	return []byte(fmt.Sprintf(`"%s"`, (*time.Time)(d).Format("2006-01-02"))), nil
    }
    
    func (d *Date) UnmarshalJSON(b []byte) error {
    	dd, err := time.ParseInLocation(`"2006-01-02"`, string(b), time.Local)
    	if err != nil {
    		return err
    	}
    	*d = Date(dd)
    	return nil
    }
    
    type Datetime time.Time
    
    func (d *Datetime) Scan(value interface{}) (err error) {
    	nullTime := &sql.NullTime{}
    	err = nullTime.Scan(value)
    	*d = Datetime(nullTime.Time)
    	return
    }
    
    func (d Datetime) Value() (driver.Value, error) {
    	y, m, dd := time.Time(d).Date()
    	return time.Date(y, m, dd, 0, 0, 0, 0, time.Time(d).Location()), nil
    }
    
    func (d *Datetime) MarshalJSON() ([]byte, error) {
    	return []byte(fmt.Sprintf("%s", (*time.Time)(d).Format(`"2006-01-02 15:04:05"`))), nil
    }
    
    func (d *Datetime) UnmarshalJSON(b []byte) error {
    	dd, err := time.ParseInLocation(`"2006-01-02 15:04:05"`, string(b), time.Local)
    	if err != nil {
    		return err
    	}
    	*d = Datetime(dd)
    	return nil
    }
    
    // GormDataType gorm common data type
    func (d Datetime) GormDataType() string {
    	return "datetime"
    }
    
    Songzhibin
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  • 原文地址:https://www.cnblogs.com/binHome/p/14597192.html
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