golang reflect库简单的例子

reflect库不常用，所有每次用的时候都要翻看文档,为了方便自己，特定写个例子

package main

import (
    "log"
    "reflect"
)

type Info struct {
    Id int
}

func Log(format string, args ...interface{}) {
    log.Printf(format+"\n", args...)
}
func main() {
    log.SetFlags(log.Ldate | log.Lshortfile) //
    var i Info
    t := reflect.TypeOf(i)
    Log("name:%s", t.Name())
    Log("string:%+v", t.String())
    Log("kind:%+v", t.Kind())
    Log("pkgPath:%+v", t.PkgPath())
    v := reflect.ValueOf(i)
    Log("value:%+v", v.FieldByName("Id").Int())
    Log("value:%+v", v.FieldByName("Id").Interface())
    Log("split%s", "====")
    s := &i
    t = reflect.TypeOf(s)
    Log("kind of t:%+v", t.Kind())
    switch t.Kind() {
    case reflect.Ptr:
        Log("pt:%+v", "")
    case reflect.Struct:
        Log("struct:%+v", "")
    }

t = reflect.Indirect(reflect.ValueOf(s)).Type()
    Log("name:%s", t.Name())
    Log("string:%+v", t.String())
    Log("kind:%+v", t.Kind())
    Log("pkgPath:%+v", t.PkgPath())

}

上面的代码执行结果如下:

2019/06/08 main.go:13: name:Info
2019/06/08 main.go:13: string:main.Info
2019/06/08 main.go:13: kind:struct
2019/06/08 main.go:13: pkgPath:main
2019/06/08 main.go:13: value:0
2019/06/08 main.go:13: value:0
2019/06/08 main.go:13: split====
2019/06/08 main.go:13: kind of t:ptr
2019/06/08 main.go:13: pt:
2019/06/08 main.go:13: name:Info
2019/06/08 main.go:13: string:main.Info
2019/06/08 main.go:13: kind:struct
2019/06/08 main.go:13: pkgPath:main