package main

import (
  "crypto/md5"
  "crypto/rand"
  "encoding/base64"
  "encoding/hex"
  "fmt"
  "io"
)

//生成32位md5字串
func GetMd5String(s string) string {
  h := md5.New()
  h.Write([]byte(s))
  return hex.EncodeToString(h.Sum(nil))
}

//生成Guid字串
func UniqueId() string {
  b := make([]byte,48)

  if _,err := io.ReadFull(rand.Reader,b); err != nil {
    return ""
  }
  return GetMd5String(base64.URLEncoding.EncodeToString(b))
}

func main() {
  a := UniqueId()
  fmt.Println(a)
}