creating URL using protocol,port,host

[Abhinav Srivastava]

Hi,

I wanted to create the URL string like in java e.g.

String host = InetAddress.getLocalHost().getHostAddress();

for (int i = 0; i < 10; i++) { URL url = new URL("http", host, port + i, ""); stud.createMyPage(url.toString()) } I want to achieve the same in Go. I was thinking of using something like : name,err:=os.Hostname() addrs,err:=net.LookupHost(name) Please guide me further. Thanks Abhinav

[StalkR]

Hi Abhinav, net/url module can help: http://godoc.org/net/url#URL

Build your URL struct then call .String().

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[Abhinav Srivastava]

Hi StalkR,

Thanks for the reply..I looked into net/url package for the URL string creation but i donot know if I am doing the right way..

package main

import (

    "fmt"

    "net"

    "os"

)

func main() {

    name,_:=os.Hostname()

    addrs,_:=net.LookupHost(name)

    fmt.Println(addrs)

}

ouput :

[fe80::79b0:e252:515f:eb4d fe80::4d0:e6b0:7ece:854d 172.31.81.78 2001:0:9d38:6abd:4d0:e6b0:7ece:854d]

 
This is not how I want, like in JAVA , the code in my previous post will return the hostaddress in readable string..how to achieve the same in Go.

Also for url string..

Can I do something like this :

for i:=0;i<10;i++{

   url=URL{"https",nil,nil,addrs,..........}  //similarly setting other properties and using addrs from above.

  stud.createMyPage(url.String())

}

Is this the right way to do?

Please guide..

Thanks Abhinav

[Abhinav Srivastava]

Sorry my bad..i should reframe some part of my query..how can i get only the IPV4 address since :

addrs,_:=net.LookupHost(name)

 is returning all the associated address to the "name".

Thanks 

[Abhinav Srivastava]

got the IPv4 extracted :

package main

import (

    "fmt"

    "net"

    "os"

)

func main() {

    //var newip IP

    name,_:=os.Hostname()

    fmt.Println (name)

    addrs,_:=net.LookupHost(name)

    for _,val:=range(addrs) {

        newip:=net.ParseIP(val)

        if newip.To4()==nil {

            continue

        }else{

        fmt.Println(val)

    }   }

}

Please guide me if anything easier than this and also for URL , am i using the right way..

Thanks 

Abhinav

[StalkR]

Your code for IPv4 is good.

You can use net/url like this: u := url.URL{Scheme: "http", Host: val} then fmt.Println(u.String())

For a complete example see: http://play.golang.org/p/2n_0XfR8Xb

Also, don't discard errors:

name,err := os.Hostname()

if err != nil {

  fmt.Println("error:", err)

  os.Exit(1)

}