[go random]go random #go #random

crypto_rand.go

// 更安全的随机
package main

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

// Key return a random key
func Key() string {
	buf := make([]byte, 16)
	_, err := rand.Read(buf)
	if err != nil {
		panic(err) // out of randomness, should never happen
	}
	return fmt.Sprintf("%x", buf)
	// or hex.EncodeToString(buf)
	// or base64.StdEncoding.EncodeToString(buf)
}

func main() {
	fmt.Println(Key())
}

random.go

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
    // 必须要设置 Seed, 否则每次产生的随机数相同
	rand.Seed(time.Now().UnixNano())
	fmt.Println(rand.Int31n(100))
}