• URL解析验证问题
  • net.ParseIP()只能解析不带冒号以及端口号的IP4/IP6
    • ?: 127.0.0.1、2001:db8::68
    • ?: 127.0.0.1:8080、www.baidu.com
  • url.Parse()最好只用来解析标准URL，不能用来验证URL的正确性

func main() {
    IP1 := "www.baidu.com"
    IP2 := "127.0.0.1"
    IP3 := "127.0.0.1:8080"
    parsedIP1 := net.ParseIP(IP1)
    parsedIP2 := net.ParseIP(IP2)
    parsedIP3 := net.ParseIP(IP3)
    fmt.Println("net.ParseIP: ", parsedIP1, parsedIP2, parsedIP3)

    fmt.Println()

    Url1 := "127.0.0"
    Url2 := "abc"
    Url3 := "127.0.0.1:8080"
    Url4 := "http://127.0.0.1:8080/url"

    parsedUrl1, err := url.Parse(Url1)
    if err != nil {
        fmt.Println("Error: ", err)
    }
    parsedUrl2, err := url.Parse(Url2)
    if err != nil {
        fmt.Println("Error: ", err)
    }
    parsedUrl3, err := url.Parse(Url3)
    if err != nil {
        fmt.Println("Error: ", err)
    }
    parsedUrl4, err := url.Parse(Url4)
    if err != nil {
        fmt.Println("Error: ", err)
    }
    fmt.Println("1: ", parsedUrl1, "2: ", parsedUrl2, "3: ", parsedUrl3, "4: ", parsedUrl4)
}
/*
输出结果：
net.ParseIP:  <nil> 127.0.0.1 <nil>

Error:  parse 127.0.0.1:8080: first path segment in URL cannot contain colon
1:  127.0.0 2:  abc 3:  <nil> 4:  http://127.0.0.1:8080/url

*/

• 正确的URL验证方式
  • go get github.com/asaskevich/govalidator
    
  • govalidator.IsURL()
• 获取并修改URL之Host、Port、Path

func main() {
    rawUrl := "http://127.0.0.1:8080/url/123"
    changeHost := "192.168.1.1"

    newUrl, _ := url.Parse(rawUrl)

    // Host
    newUrlHost := newUrl.Hostname()
    // Port
    newUrlPort := newUrl.Port()
    // Path
    newUrlPath := newUrl.Path
    // URL类型转string
    stringUrl := newUrl.String()
    // 修改URl Host
    newUrl.Host = changeHost + ":" + newUrl.Port()

    fmt.Println(newUrlHost, newUrlPort, newUrlPath, stringUrl, newUrl)
}

其他相关方法:

• Host、Port
  • net.SplitHostPort() ==> Host、Port、error
  • u := strings.Split(url, ":") ==> Host := u[0]
• Path
  • url := http://www.a.com/123 ==> base := path.Base(url)
  • fmt.Println(base) ==> 123
    
    
    

    以上结合可完成关于Golang操作URL的大部分问题