first commit

common/tool/krand.go

@@ -0,0 +1,28 @@
+package tool
+
+import (
+	"math/rand"
+	"time"
+)
+
+const (
+	KC_RAND_KIND_NUM   = 0 // 纯数字
+	KC_RAND_KIND_LOWER = 1 // 小写字母
+	KC_RAND_KIND_UPPER = 2 // 大写字母
+	KC_RAND_KIND_ALL   = 3 // 数字、大小写字母
+)
+
+// 随机字符串
+func Krand(size int, kind int) string {
+	ikind, kinds, result := kind, [][]int{[]int{10, 48}, []int{26, 97}, []int{26, 65}}, make([]byte, size)
+	is_all := kind > 2 || kind < 0
+	rand.Seed(time.Now().UnixNano())
+	for i := 0; i < size; i++ {
+		if is_all { // random ikind
+			ikind = rand.Intn(3)
+		}
+		scope, base := kinds[ikind][0], kinds[ikind][1]
+		result[i] = uint8(base + rand.Intn(scope))
+	}
+	return string(result)
+}