Golang结构体格式化输出问题

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go结构体存在嵌套结构体时,使用%+v格式化输出时会出现打印指针地址的问题,如:

type Student struct{
    Name string
    Desp string
}

type Teacher struct{
    Student []*Student
    Name string
}

func main() {
    teacher := new(Teacher)
    teacher.Name = "teacher"

    student := new(Student)
    student.Name = "student"
    student.Desp = "this is student"

    student2 := new(Student)
    student2.Name = "student2"
    student2.Desp = "this is student2"

    teacher.Student = append(teacher.Student, student)
    teacher.Student = append(teacher.Student, student2)
    result := fmt.Sprintf("%+v",*teacher)
    fmt.Print(result)
}

//输出:
//{Student:[0xc420080020 0xc420080040] Name:teacher}

如果要实现%+v格式化输出所有的内容,可以通过实现对应结构体的String()方法,如:

type Student struct{
    Name string
    Desp string
}

type Teacher struct{
    Student []*Student
    Name string
}

func (s *Student) String() string {
    return "{Name:"+s.Name+" "+"Desp:"+s.Desp+"}"
}

func main() {
    teacher := new(Teacher)
    teacher.Name = "teacher"

    student := new(Student)
    student.Name = "student"
    student.Desp = "this is student"

    student2 := new(Student)
    student2.Name = "student2"
    student2.Desp = "this is student2"

    teacher.Student = append(teacher.Student, student)
    teacher.Student = append(teacher.Student, student2)
    result := fmt.Sprintf("%+v",*teacher)
    fmt.Print(result)
}

//输出:
//{Student:[{Name:student Desp:this is student} {Name:student2 Desp:this is student2}] Name:teacher}

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查看原文:Golang结构体格式化输出问题

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