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pkg/utility/seqs/rand.go

@@ -0,0 +1,68 @@
+package seqs
+
+import (
+	cr "crypto/rand"
+	"math/big"
+	mr "math/rand"
+	"time"
+)
+
+// 随机生成器;
+type rand struct {
+}
+
+// 全局随机数;
+var rnd *mr.Rand
+
+func init() {
+	rnd = mr.New(mr.NewSource(time.Now().UnixNano()))
+}
+
+// 构建;
+func Rand() *rand {
+	return &rand{}
+}
+
+// 随机数字;
+func (rd *rand) DigitId(_len int) string {
+	return rd.newId([]byte("0123456789"), _len)
+}
+
+// 随机字母;
+func (rd *rand) ChrtId(_len int) string {
+	return rd.newId([]byte("abcdefghijklmnopqrstuvwxyz"), _len)
+}
+
+// 随机混合(数字+字母);
+func (rd *rand) BothId(_len int) string {
+	return rd.newId([]byte("0123456789abcdefghijklmnopqrstuvwxyz"), _len)
+}
+
+// 随机范围(长整型);
+func (rd *rand) RandI64(min, max int64) int64 {
+	bi, _ := cr.Int(cr.Reader, big.NewInt(max-min))
+	return min + bi.Int64()
+}
+
+// 随机范围(0 ~ max);
+func (rd *rand) RandInt(max int) int {
+	return rnd.Intn(max)
+}
+
+// 随机中文;
+func (rd *rand) ChrtCn(_len int) string {
+	a := make([]rune, _len)
+	for i := range a {
+		a[i] = rune(rd.RandI64(19968, 40869))
+	}
+	return string(a)
+}
+
+// newId;
+func (rd *rand) newId(tmpl []byte, _len int) string {
+	var r []byte
+	for i := 0; i < _len; i++ {
+		r = append(r, tmpl[rnd.Intn(len(tmpl))])
+	}
+	return string(r)
+}