2019-01-28 03:19:49 +00:00
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package utils
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import (
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"fmt"
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"log"
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"math/rand"
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"net/url"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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// Rand 随机数字 0 <= n < max
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func Rand(max int) int {
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rand.Seed(time.Now().UnixNano())
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return rand.Intn(max)
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}
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// RandInt 随机一个数字 min <= n < max
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func RandInt(min int, max int) int {
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if max == min {
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return min
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}
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rand.Seed(time.Now().UnixNano())
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if max < min {
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min, max = max, min
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}
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return min + rand.Intn(max-min)
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}
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// Rand64 随机数字 0 <= n < max
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func Rand64(max int64) int64 {
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rand.Seed(time.Now().UnixNano())
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return rand.Int63n(max)
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}
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// RandInt64 随机一个数字 min <= n < max
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func RandInt64(min int64, max int64) int64 {
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if max == min {
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return min
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}
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rand.Seed(time.Now().UnixNano())
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if max < min {
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min, max = max, min
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}
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return min + rand.Int63n(max-min)
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}
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// Max 取两个数较大的一个
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func Max(a, b int) int {
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if a > b {
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return a
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}
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return b
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}
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// MaxInt64 取两个数较大的一个
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func MaxInt64(a, b int64) int64 {
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if a > b {
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return a
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}
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return b
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}
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// Min 取两个数较小的一个
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func Min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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// MinInt64 取两个数较小的一个
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func MinInt64(a, b int64) int64 {
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if a < b {
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return a
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}
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return b
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}
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// RandNumStr 生成多位随机数字符串
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func RandNumStr(l int) string {
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ret := ""
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for i := 0; i < l; i++ {
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ret += strconv.Itoa(Rand(10))
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}
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return ret
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}
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// Reverse 字符串反转
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func Reverse(s string) string {
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runes := []rune(s)
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for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
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runes[i], runes[j] = runes[j], runes[i]
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}
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return string(runes)
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}
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// RandArray 随机一个数组值
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func RandArray(arr []string) string {
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return arr[Rand(len(arr))]
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}
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// 随机一个字符串
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func RandString(l int) string {
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str := "0123456789abcdefghijklmnopqrstuvwxyz"
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bytes := []byte(str)
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result := []byte{}
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r := rand.New(rand.NewSource(time.Now().UnixNano()))
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for i := 0; i < l; i++ {
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result = append(result, bytes[r.Intn(len(bytes))])
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}
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return string(result)
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}
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// Range 生成一个数组 不包括n
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func Range(m, n int) (b []int) {
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if m >= n {
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return b
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}
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for i := m; i < n; i++ {
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b = append(b, i)
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}
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return b
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}
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// Keys 返回map中的所有字符串key
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func KeysByString(m map[string]interface{}) []string {
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var keys []string
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for k, _ := range m {
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keys = append(keys, k)
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}
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return keys
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}
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// Values 返回map中的所有value
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func Values(m map[string]interface{}) []interface{} {
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var values []interface{}
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for _, v := range m {
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values = append(values, v)
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}
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return values
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}
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// InArray 是否在列表中
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func InArray(v string, s []string) int {
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for i, val := range s {
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if val == v {
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return i
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}
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}
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return -1
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}
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// InSlice 是否在Slice中
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/*func InSlice(v interface{}, s interface{}) int {
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if ss, ok := s.([]interface{}); ok {
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for i, val := range ss {
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if val == v {
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return i
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}
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}
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}
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return -1
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}*/
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func InSlice(v interface{}, s interface{}) int {
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switch reflect.TypeOf(s).Kind() {
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case reflect.Slice:
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s := reflect.ValueOf(s)
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for i := 0; i < s.Len(); i++ {
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if reflect.DeepEqual(v, s.Index(i).Interface()) == true {
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return i
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}
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}
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}
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return -1
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}
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// Trim 清除左右两边空格
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func Trim(str string) string {
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return strings.Trim(str, " \r\n\t")
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}
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// CheckFatal 检查致命错误
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func CheckFatal(err error) {
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if err != nil {
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log.Fatalln(err)
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}
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}
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// CheckPanic 检查恐慌
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func CheckPanic(err error) {
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if err != nil {
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log.Panicln(err)
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}
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}
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// CheckFormEmpty 检查Form表单的某个值是否为空
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// 为空返回真
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func CheckFormEmpty(form url.Values, key string) bool {
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if _, ok := form[key]; ok {
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if Trim(form[key][0]) != "" {
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return false
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}
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}
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return true
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}
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// 检查Form表单的哪个字段值为空
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// 发现空值时返回该字段的名称, 否则返回空白字符
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func CheckFormEmptyByKeys(form url.Values, keys string) string {
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arr := strings.Split(keys, ",")
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for _, key := range arr {
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k := Trim(key)
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if CheckFormEmpty(form, k) {
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return k
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}
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}
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return ""
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}
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// PrintStruct 用来打印一个结构的字段与值对应表
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func PrintStruct(structPtr interface{}) {
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s := reflect.ValueOf(structPtr).Elem()
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typeOfT := s.Type()
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for i := 0; i < s.NumField(); i++ {
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f := s.Field(i)
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fmt.Printf("%s (%s) = %v\n",
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typeOfT.Field(i).Name, f.Type(), f.Interface())
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}
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}
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// Len 获取带有中文等非ASCII字符的字符串长度
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func Len(str string) int {
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rs := []rune(str)
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return len(rs)
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}
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// Substr 截取字符串
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// 例: abc你好1234
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// Substr(str, 0) == abc你好1234
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// Substr(str, 2) == c你好1234
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// Substr(str, -2) == 34
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// Substr(str, 2, 3) == c你好
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// Substr(str, 0, -2) == 34
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// Substr(str, 2, -1) == b
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// Substr(str, -3, 2) == 23
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// Substr(str, -3, -2) == 好1
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func Substr(str string, start int, length ...int) string {
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rs := []rune(str)
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lth := len(rs)
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end := 0
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if start > lth {
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return ""
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}
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if len(length) == 1 {
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end = length[0]
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}
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//从后数的某个位置向后截取
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if start < 0 {
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if -start >= lth {
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start = 0
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} else {
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start = lth + start
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}
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}
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if end == 0 {
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end = lth
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} else if end > 0 {
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end += start
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if end > lth {
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end = lth
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}
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} else { //从指定位置向前截取
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if start == 0 {
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start = lth
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}
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start, end = start+end, start
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}
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if start < 0 {
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start = 0
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}
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return string(rs[start:end])
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}
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// SplitIDStr 把以半角逗号分隔的ID字符串分隔提取到切片中
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func SplitIDStr(str string) []int {
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ret := make([]int, 0)
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ids := strings.Split(str, ",")
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for _, idStr := range ids {
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idStr = Trim(idStr)
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if IsNumStr(idStr) {
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ret = append(ret, Atoi(idStr))
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}
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}
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return ret
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}
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// IntArrToString 将[]int转换成以指定分隔符分隔的字符串
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func IntArrToString(a []int, separator ...string) string {
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sep := ","
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if len(separator) == 1 {
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sep = separator[0]
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}
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return strings.Trim(strings.Replace(fmt.Sprint(a), " ", sep, -1), "[]")
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//return strings.Trim(strings.Join(strings.Split(fmt.Sprint(a), " "), sep), "[]")
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//return strings.Trim(strings.Join(strings.Fields(fmt.Sprint(a)), sep), "[]")
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}
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// StrPad 向字符串中添加指定字符串到指定长度
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func StrPad(str interface{}, length int, pad interface{}, padLeft bool) string {
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returnStr := ""
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padStr := ""
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if "int" == GetTypeName(str) {
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returnStr = Itoa(str.(int))
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}
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if "int" == GetTypeName(pad) {
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padStr = Itoa(pad.(int))
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}
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padLen := length - Len(returnStr)
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if padLen > 0 {
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padString := ""
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for i := 0; i < padLen; i++ {
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padString += padStr
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}
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if padLeft {
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returnStr = padString + returnStr
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} else {
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returnStr += padString
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}
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}
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return returnStr
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}
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// 返回sync.Map类型的长度
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func LenSyncMap(m *sync.Map) int {
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var length int
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m.Range(func(_, _ interface{}) bool {
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length++
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return true
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})
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return length
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}
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2019-01-31 08:57:22 +00:00
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// 模拟三元操作符
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2019-01-28 03:19:49 +00:00
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func Ternary(b bool, trueVal, falseVal interface{}) interface{} {
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if b {
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return trueVal
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}
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return falseVal
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}
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