Get domain from strange yet valid url with java

Question

I need to get host from this url

android-app://com.google.android.googlequicksearchbox?Pub_id={siteID}

java.net.URL and java.net.URI can't handle it.

If there is no protocol handler installed for android-app: then one would receive an exception with "unknown protocol". Also {} might be problemation: "...?Pub_id=" + URLEncoder.encode("{siteID}", "UTF-8"): Though I suspect you need to fill in {siteId}. — Joop Eggen
– Joop Eggen, Commented Jan 17, 2019 at 13:22

Karol Dowbecki · Accepted Answer · 2019-01-17 13:26:47Z

8

The problem is in { and } characters which are not valid for URI. Looks like a placeholder that wasn't resolved correctly when creating a URI.

You can use String.replaceAll() to get rid of these two characters:

String value = "android-app://com.google.android.googlequicksearchbox?Pub_id={siteID}";
URI uri = URI.create(value.replaceAll("[{}]", ""));
System.out.println(uri.getHost()); // com.google.android.googlequicksearchbox

edited Jan 17, 2019 at 13:26

answered Jan 17, 2019 at 13:15

Karol Dowbecki

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2 Comments

Dennis Gloss Over a year ago

Could you please write all characters which are not valid for URI. I know another one "\"

Karol Dowbecki Over a year ago

@DennisGlot see perishablepress.com/stop-using-unsafe-characters-in-urls

Dennis Gloss · Accepted Answer · 2019-02-07 15:34:52Z

1

You see, eventually I need path, scheme and query.
I've just found super fast library for parsing such URLs. https://github.com/anthonynsimon/jurl
It's also very flexible.

answered Feb 7, 2019 at 15:34

Dennis Gloss

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Comments

UVM · Accepted Answer · 2019-01-17 13:26:05Z

0

You can try the following code

String url = "android-app://com.google.android.googlequicksearchbox?Pub_id={siteID}";
        url = url.replace("{", "").replace("}","");
        URI u;
        try {
            u = new URI(url);
            System.out.println(u.getHost());
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }

answered Jan 17, 2019 at 13:26

UVM

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