Golang实现一个密码生成器

                package main

import (
    
                "
                flag
                "
                "
                fmt
                "
                "
                math/rand
                "
                "
                time
                "
                
)


                var
                 (
    length  
                int
                
    charset 
                string
                
)


                const
                 (
    NUmStr  = "0123456789"
    CharStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
    SpecStr = "+=-@#~,.[]()!%^*$"
)

//解析参数func parseArgs() {
    //需要接受指针，就传递地址,&
    flag.IntVar(&length, "l", 16, "-l 生成密码的长度")
    flag.StringVar(&charset, "t", "num",
        //反引号以原样输出
        `-t 制定密码生成的字符集,
        num:只使用数字[0-9],
        char:只使用英文字母[a-zA-Z],
        mix:使用数字和字母，
        advance:使用数字、字母以及特殊字符`)
    flag.Parse()
}

//检测字符串中的空格func test1() {
    for i := 0; i < len(CharStr); i++ {
        if CharStr[i] != ‘‘ {
            fmt.Printf("%c", CharStr[i])
        }
    }
}

func generatePasswd() string {
    //初始化密码切片var passwd []byte = make([]byte, length, length)
    //源字符串var sourceStr string//判断字符类型,如果是数字if charset == "num" {
        sourceStr = NUmStr
        //如果选的是字符
    } elseif charset == "char" {
        sourceStr = charset
        //如果选的是混合模式
    } elseif charset == "mix" {
        sourceStr = fmt.Sprintf("%s%s", NUmStr, CharStr)
        //如果选的是高级模式
    } elseif charset == "advance" {
        sourceStr = fmt.Sprintf("%s%s%s", NUmStr, CharStr, SpecStr)
    } else {
        sourceStr = NUmStr
    }
    fmt.Println("source:", sourceStr)

    //遍历，生成一个随机index索引,for i := 0; i < length; i++ {
        index := rand.Intn(len(sourceStr))
        passwd[i] = sourceStr[index]
    }
    returnstring(passwd)
}

func main() {
    //随机种子    rand.Seed(time.Now().UnixNano())
    parseArgs()
    fmt.Printf("length:%d charset:%s\n", length, charset)
    //test1()
    passwd := generatePasswd()
    fmt.Println(passwd)
    fmt.Printf("length:%d charset:%s\n", length, charset)
}