Time format solution for Golang structure JSON

This is a creation in Article, where the information may have evolved or changed.

Sometimes project development encounters a time format problem with the JSON conversion of a struct. That is, this 1993-01-01t20:08:23.000000028+08:00 represents the UTC method. From what we used to say, the more like hope is 1993-01-01 20:08:23 this format. The re-replication code is as follows:

package mainimport (    "time"    "encoding/json")type Student struct {    Name string     `json:"name"`    Brith time.Time `json:"brith"`}func main()  {    stu:=Student{        Name:"qiangmzsx",        Brith:time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local),    }    b,err:=json.Marshal(stu)    if err!=nil {        println(err)    }    println(string(b))//{"name":"qiangmzsx","brith":"1993-01-01T20:08:23.000000028+08:00"}}

In the face of such problems, how is Golang solved? There are two kinds of solutions, let's take a look at each one.

Through time. Time Type Alias

type JsonTime time.Time// 实现它的json序列化方法func (this JsonTime) MarshalJSON() ([]byte, error) {    var stamp = fmt.Sprintf("\"%s\"", time.Time(this).Format("2006-01-02 15:04:05"))    return []byte(stamp), nil}type Student1 struct {    Name string     `json:"name"`    Brith JsonTime  `json:"brith"`}func main()  {    stu1:=Student1{        Name:"qiangmzsx",        Brith:JsonTime(time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local)),    }    b1,err:=json.Marshal(stu1)    if err!=nil {        println(err)    }    println(string(b1))//{"name":"qiangmzsx","brith":"1993-01-01 20:08:23"}}

Using struct-body combination methods

This approach is somewhat more complex than the first approach.

type Student2 struct {    Name string     `json:"name"`    // 一定要将json的tag设置忽略掉不解析出来    Brith time.Time  `json:"-"`}// 实现它的json序列化方法func (this Student2) MarshalJSON() ([]byte, error) {    // 定义一个该结构体的别名    type AliasStu Student2    // 定义一个新的结构体    tmpStudent:= struct {        AliasStu        Brith string `json:"brith"`    }{        AliasStu:(AliasStu)(this),        Brith:this.Brith.Format("2006-01-02 15:04:05"),    }    return json.Marshal(tmpStudent)}func main()  {    stu2:=Student2{        Name:"qiangmzsx",        Brith:time.Date(1993, 1, 1, 20, 8, 23, 28, time.Local),    }    b2,err:=json.Marshal(stu2)    if err!=nil {        println(err)    }    println(string(b2))//{"name":"qiangmzsx","brith":"1993-01-01 20:08:23"}}

This method uses the combination of Golang structure, can realize the inheritance of OOP, but also embodies golang flexibility.

Add Marshaljson, Unmarshaljson, and String methods to any struct to implement custom JSON output formats and printing methods.