短URL介绍链接:
1)https://segmentfault.com/a/1190000012088345
2)http://www.voidcn.com/article/p-ydjqllgt-ed.html
3)https://pathbox.github.io/2018/02/22/short-url-build-system/
开始撸代码:
package main
import (
"crypto/md5"
"fmt"
"strconv"
"strings"
)
var chars = strings.Split("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", "")
// 1) 哈希实现
func hashShortUrl(url string) {
hex := fmt.Sprintf("%x", md5.Sum([]byte(url)))
resUrl := make([]string, 4)
for i := 0;i < 4;i++ {
val, _ := strconv.ParseInt(hex[i*8:i*8+8], 16, 0)
lHexLong := val & 0x3fffffff
outChars := ""
for j := 0;j < 6;j++ {
outChars += chars[0x0000003D & lHexLong]
lHexLong >>= 5
}
resUrl[i] = outChars
}
fmt.Println(resUrl)
}
// 2) 自增长算法
func autoShortUrl(id int64) string {
return GetString62(Encode62(id))
}
func Encode62(id int64) []int64 {
tempE := []int64{}
for id > 0 {
tempE = append(tempE, id % 62)
id /= 62
}
return tempE
}
func GetString62(indexA []int64) string {
res := ""
for _, val := range indexA {
res += chars[val]
}
return reverseString(res)
}
// 反转字符串
func reverseString(s string) string {
runes := []rune(s)
for from, to := 0, len(runes) - 1;from < to;from, to = from + 1, to - 1 {
runes[from], runes[to] = runes[to], runes[from]
}
return string(runes)
}
func main() {
fmt.Println(autoShortUrl(123))
}
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