Remove port number from a url in java

Question

I want to write a function in java which removes the port if it is the default port.

So if given

String url80 = "http://www.somewhere.com:80/someplace";

it will return

String urlNo80 = "http://www.somewhere.com/someplace";

And if given

String url443 = "https://www.somewhere.com:443/someplace";

It will return

String urlNo443 = "https://www.somewhere.com/someplace";

Is there a better way to do it than

public String removePortIfDefault(String inUrl) {
    String returnUrl = inUrl;
    if (inUrl.contains("http://") && inUrl.contains(":80")) {
        returnUrl = inUrl.replaceAll(":80", "");
    }
    if (inUrl.contains("https://") && inUrl.contains(":443")) {
        returnUrl = inUrl.replaceAll(":443", "");
    }
    return returnUrl;
}

You can use URL.getDefaultPort(). See the second part of [this answer](https://stackoverflow.com/a/46669187/1831987). — VGR, Sep 18 '20 at 18:08
@VGR: Your comment should be the accepted and upvoted answer. — Peter V. Mørch, Mar 03 '21 at 00:09

score 4 · Answer 1 · answered Sep 18 '20 at 16:22

4

You can use replaceFirst (or replaceAll) with a regular expression

String urlNo80 = url80.replaceFirst(":\\d+", "");

answered Sep 18 '20 at 16:22

Joakim Danielson

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This won't work if `:8809` is somewhere completely else in the URL... – Peter V. Mørch Mar 03 '21 at 00:09
And where would that be? I’m not sure I understand what you mean. – Joakim Danielson Mar 03 '21 at 07:51
Is that really a valid url? – Joakim Danielson Mar 03 '21 at 08:00
In my case, I have to use RegExp in replace pattern _':\\d+'_ => `String urlNo80 = url80.replaceFirst(RegExp(r':\d+'), '');` – agfe2 Dec 14 '22 at 06:15

score 4 · Accepted Answer · answered Sep 18 '20 at 17:19

4

Don't use string manipulation to work with a URL. Java has classes for that.

String url80 = "http://www.somewhere.com:80/someplace";

// Using java.net.URI
URI uri = URI.create(url80);
uri = new URI(uri.getScheme(), uri.getHost(), uri.getPath(), uri.getFragment());
String urlNo80 = uri.toString(); // http://www.somewhere.com/someplace

// Using java.net.URL
URL url = new URL(url80);
url = new URL(url.getProtocol(), url.getHost(), url.getFile());
String urlNo80 = url.toString(); // http://www.somewhere.com/someplace

answered Sep 18 '20 at 17:19

Andreas

154,647
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5

*BEWARE*: Yes, this turns `http://www.somewhere.com:80/someplace` into `http://www.somewhere.com/someplace`, but it also turns `http://www.somewhere.com:1234/someplace` into `http://www.somewhere.com/someplace` which means this is a very dangerous solution in my opinion. – Peter V. Mørch Mar 02 '21 at 23:59

Remove port number from a url in java

2 Answers2