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由于前台web页面传来的日期对象是这样的格式“2010-11-03 15:23:22”,所以我安装网上查来的办法,自定义包装了time.Time对象,实现自己的Marshal和UnMarshal方法
type DateTime struct { time.Time } const ctLayout = "2006-01-02 15:04:05" const ctLayout_nosec = "2006-01-02 15:04" const ctLayout_date = "2006-01-02" func (this *DateTime) UnmarshalJSON(b []byte) (err error) { if b[0] == ‘"‘ && b[len(b)-1] == ‘"‘ { b = b[1 : len(b)-1] } loc, err := time.LoadLocation("Asia/Shanghai") if err != nil { panic(err) } sv := string(b) if len(sv) == 10 { sv += " 00:00:00" } else if len(sv) == 16 { sv += ":00" } this.Time, err = time.ParseInLocation(ctLayout, string(b), loc) if err != nil { if this.Time, err = time.ParseInLocation(ctLayout_nosec, string(b), loc); err != nil { this.Time, err = time.ParseInLocation(ctLayout_date, string(b), loc) } } return } func (this *DateTime) MarshalJSON() ([]byte, error) { rs := []byte(this.Time.Format(ctLayout)) return rs, nil } var nilTime = (time.Time{}).UnixNano() func (this *DateTime) IsSet() bool { return this.UnixNano() != nilTime }
然后,把结构中声明为time.Time的都修改为自定义的类型DateTime,试了一下,发现已经可以正确解析网页发来的时间,但是在输出时,总是不对,好像并没有调用自定义的Marshal方法。编写测试方法发现,原来json.Marshal方法调用DateTime.Marshal时出错了!
invalid character ‘-‘ after top-level value
开始没有认真看,以为“-”号不合法,就换了一个,结果错误一样:
invalid character ‘/‘ after top-level value
看来,根本不是分割符的问题,仔细分析错误,发现“top-level”字样,我这返回的就是一个字符串,怎么可能top-level呢!想到这儿突然醒悟,是不是返回字符串应该自己加引号呢,急忙修改代码一试,果然!~_~
最终代码如下:
type DateTime struct { time.Time } const ctLayout = "2006-01-02 15:04:05" const ctLayout_nosec = "2006-01-02 15:04" const ctLayout_date = "2006-01-02" func (this *DateTime) UnmarshalJSON(b []byte) (err error) { if b[0] == ‘"‘ && b[len(b)-1] == ‘"‘ { b = b[1 : len(b)-1] } loc, err := time.LoadLocation("Asia/Shanghai") if err != nil { panic(err) } sv := string(b) if len(sv) == 10 { sv += " 00:00:00" } else if len(sv) == 16 { sv += ":00" } this.Time, err = time.ParseInLocation(ctLayout, string(b), loc) if err != nil { if this.Time, err = time.ParseInLocation(ctLayout_nosec, string(b), loc); err != nil { this.Time, err = time.ParseInLocation(ctLayout_date, string(b), loc) } } return } func (this *DateTime) MarshalJSON() ([]byte, error) { rs := []byte(fmt.Sprintf(`"%s"`, this.Time.Format(ctLayout))) return rs, nil } var nilTime = (time.Time{}).UnixNano() func (this *DateTime) IsSet() bool { return this.UnixNano() != nilTime }
【玩转Golang】 自定义json序列化对象时,非法字符错误原因
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原文地址:http://www.cnblogs.com/dajianshi/p/4192810.html