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package CommonUtil
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import (
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"bytes"
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"crypto/md5"
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"encoding/binary"
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"encoding/hex"
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"fmt"
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uuid "github.com/satori/go.uuid"
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"math/rand"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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/**
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功能：获取UUID
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作者：黄海
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时间：2020-02-03
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*/
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func GetUUID() string {
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u2 := strings.ToUpper(uuid.NewV4().String())
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return u2
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}
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/**
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功能：从一个数据库的查询返回结果中获取指定字段的IDS
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作者：黄海
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时间：2020-02-14
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*/
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func SelectIdsFromMapInterface(list []map[string]interface{}, key string) []string {
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var ids []string
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for i := 0; i < len(list); i++ {
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switch list[i][key].(type) {
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case string:
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ids = append(ids, list[i][key].(string))
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break
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case int64:
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ids = append(ids, strconv.FormatInt(list[i][key].(int64), 10))
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}
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}
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return ids
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}
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/**
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功能：将一个数据库查询返回结果中的某一列，形成字典
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作者：黄海
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时间：2020-02-14
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*/
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func PutSelectResultToMapByField(list []map[string]interface{}, field string) map[string]interface{} {
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_dict := make(map[string]interface{})
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for i, _ := range list {
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record := list[i]
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switch record[field].(type) {
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case int64:
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_dict[strconv.FormatInt(record[field].(int64), 10)] = 1
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default:
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_dict[record[field].(string)] = 1
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}
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}
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return _dict
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}
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/**
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功能：通过字典获取字符串数组
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作者：黄海
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时间：2020-02-14
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*/
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func GetArrayByMap(_dict map[string]interface{}) []string {
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Ids := make([]string, 0, len(_dict))
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for k := range _dict {
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Ids = append(Ids, k) //
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}
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return Ids
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}
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/**
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功能：将数据库返回的查询结果映射成字典，用于扩展字段
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作者：黄海
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时间：2020-02-14
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*/
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func ConvertMapInterfaceToMapByField(list []map[string]interface{}, key string, value string) map[string]string {
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_map := make(map[string]string)
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for i, _ := range list {
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var areaTypeId string
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switch list[i][key].(type) {
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case int64:
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areaTypeId = strconv.FormatInt(list[i][key].(int64), 10)
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default:
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areaTypeId = list[i][key].(string)
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}
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switch list[i][value].(type) {
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case int64:
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_map[areaTypeId] = strconv.FormatInt(list[i][value].(int64), 10)
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default:
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_map[areaTypeId] = list[i][value].(string)
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}
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}
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return _map
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}
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/**
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功能：扩展数据库查询结果集
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作者：黄海
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时间：2020-02-14
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*/
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func ExtendList(list *[]map[string]interface{}, _map map[string]string, key string, value string) {
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for i, _ := range *list {
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sourceRecord := (*list)[i]
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var a string
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switch sourceRecord[key].(type) {
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case int64:
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a = strconv.FormatInt(sourceRecord[key].(int64), 10)
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default:
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a = sourceRecord[key].(string)
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}
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sourceRecord[value] = _map[a]
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}
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}
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/**
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功能：删除字符串多余的空格
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作者：黄海
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时间：2020-01-20
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*/
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func DeleteExtraSpace(s string) string {
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//删除字符串中的多余空格，有多个空格时，仅保留一个空格
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s1 := strings.Replace(s, " ", " ", -1) //替换tab为空格
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regstr := "\\s{2,}" //两个及两个以上空格的正则表达式
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reg, _ := regexp.Compile(regstr) //编译正则表达式
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s2 := make([]byte, len(s1)) //定义字符数组切片
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copy(s2, s1) //将字符串复制到切片
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spcIndex := reg.FindStringIndex(string(s2)) //在字符串中搜索
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for len(spcIndex) > 0 { //找到适配项
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s2 = append(s2[:spcIndex[0]+1], s2[spcIndex[1]:]...) //删除多余空格
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spcIndex = reg.FindStringIndex(string(s2)) //继续在字符串中搜索
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}
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return string(s2)
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}
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// Capitalize 字符首字母大写
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func Capitalize(str string) string {
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var upperStr string
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vv := []rune(str) // 后文有介绍
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for i := 0; i < len(vv); i++ {
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if i == 0 {
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if vv[i] >= 97 && vv[i] <= 122 { // 后文有介绍
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vv[i] -= 32 // string的码表相差32位
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upperStr += string(vv[i])
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} else {
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fmt.Println("Not begins with lowercase letter,")
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return str
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}
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} else {
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upperStr += string(vv[i])
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}
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}
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return upperStr
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}
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/**
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功能：获取蛇形命名的字符串
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作者：黄海
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时间：2020-01-22
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*/
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func GetSnakeCaseStr(str string) string {
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array := strings.Split(str, "_")
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var result string
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for i := 0; i < len(array); i++ {
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result = result + strings.ToUpper(array[i][0:1]) + array[i][1:]
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}
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return result
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}
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const (
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// 可自定义盐值
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TokenSalt = "DsideaL4r5t6y7u"
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)
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func MD5(data []byte) string {
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_md5 := md5.New()
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_md5.Write(data)
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return hex.EncodeToString(_md5.Sum([]byte("")))
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}
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//isSymbol表示有无符号
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func BytesToInt(b []byte, isSymbol bool) (int, error) {
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if isSymbol {
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return BytesToIntS(b)
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}
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return bytesToIntU(b)
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}
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//字节数(大端)组转成int(无符号的)
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func bytesToIntU(b []byte) (int, error) {
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if len(b) == 3 {
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b = append([]byte{0}, b...)
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}
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bytesBuffer := bytes.NewBuffer(b)
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switch len(b) {
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case 1:
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var tmp uint8
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err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
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return int(tmp), err
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case 2:
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var tmp uint16
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err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
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return int(tmp), err
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case 4:
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var tmp uint32
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err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
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return int(tmp), err
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default:
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return 0, fmt.Errorf("%s", "BytesToInt bytes lenth is invaild!")
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}
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}
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//字节数(大端)组转成int(有符号)
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func BytesToIntS(b []byte) (int, error) {
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if len(b) == 3 {
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b = append([]byte{0}, b...)
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}
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bytesBuffer := bytes.NewBuffer(b)
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switch len(b) {
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case 1:
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var tmp int8
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err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
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return int(tmp), err
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case 2:
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var tmp int16
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err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
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return int(tmp), err
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case 4:
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var tmp int32
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err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
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return int(tmp), err
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default:
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return 0, fmt.Errorf("%s", "BytesToInt bytes lenth is invaild!")
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}
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}
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//整形转换成字节
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func IntToBytes(n int, b byte) ([]byte, error) {
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switch b {
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case 1:
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tmp := int8(n)
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bytesBuffer := bytes.NewBuffer([]byte{})
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binary.Write(bytesBuffer, binary.BigEndian, &tmp)
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return bytesBuffer.Bytes(), nil
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case 2:
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tmp := int16(n)
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bytesBuffer := bytes.NewBuffer([]byte{})
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binary.Write(bytesBuffer, binary.BigEndian, &tmp)
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return bytesBuffer.Bytes(), nil
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case 3, 4:
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tmp := int32(n)
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bytesBuffer := bytes.NewBuffer([]byte{})
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binary.Write(bytesBuffer, binary.BigEndian, &tmp)
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return bytesBuffer.Bytes(), nil
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}
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return nil, fmt.Errorf("IntToBytes b param is invaild")
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}
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/**
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功能：生成一个随机盐
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作者: 黄海
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时间：2020-02-18
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*/
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func GetRandomSalt() string {
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return GetRandomString(8)
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}
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//生成随机字符串
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func GetRandomString(l int) string {
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str := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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bytes := []byte(str)
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var 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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/**
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功能：将int数据类型转为int64
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作者：黄海
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时间：2020-02-18
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*/
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func ConvertIntToInt64(i int) int64 {
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s := strconv.Itoa(i)
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s64, _ := strconv.ParseInt(s, 10, 64)
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return s64
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}
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/**
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功能：获取当前的时间戳，精确度纳秒
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作者：黄海
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时间：2020-02-18
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*/
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func GetCurrentTimestamp() int64 {
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return time.Now().UnixNano()
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}
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/**
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功能：获取当前的时间字符串
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作者：黄海
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时间：2020-02-21
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*/
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func GetCurrentTime() string {
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timeStr := time.Now().Format("2006-01-02 15:04:05")
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//当前时间的字符串，2006-01-02 15:04:05据说是golang的诞生时间，固定写法
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return timeStr
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}
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/*
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获取程序运行路径
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*/
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func GetCurrentDirectory() string {
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dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
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if err != nil {
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fmt.Println(err)
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}
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return strings.Replace(dir, "\\", "/", -1)
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}
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// 判断所给路径文件/文件夹是否存在
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func Exists(path string) bool {
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_, err := os.Stat(path) //os.Stat获取文件信息
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if err != nil {
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if os.IsExist(err) {
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return true
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}
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return false
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}
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return true
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} |
