How to parse any URL/URI in Java?

Question

I am searching a way for parsing URL/URIs in Java without having to worry about Exceptions for common URLs. The Java integrated way I know are using java.net.URI respectively java.net.URL.

Each of these classes have major draw backs:

java.net.URL can not handle custom protocols/schemes and fails therefore with URLs like idontcare://bla.com/test
java.net.URI has no problems with custom protocols/schemes but it fails if for example the query part contains an "illegal character" (a special character that is not URL encoded). Therefor it failes for example in an URL like https://bla.example.org/css?family=Roboto:300|Roboto:300,400,500,700&lang=de

Is there a universal and non-resticted (does not throw errors for cases as presented above) way to parse URLs in Java?

@ y_ug That question is about the opposite direction - it is about building a correctly encoded URL, I have a String that contains an url and want just access it's components like host name and protocol/scheme. — JMax
– JMax, Commented Feb 20, 2020 at 18:58
I see. Then those who do not want extra dependencies (like UriComponents from Spring Framework) can write custom protocols/schemes handler(s) and/or implement URLStreamHandlerFactory and enable them via java.protocol.handler.pkgs property or register with URL.setURLStreamHandlerFactory. — y_ug
– y_ug, Commented Feb 21, 2020 at 14:53

cassiomolin · Accepted Answer · 2020-02-20 17:03:19Z

4

I found UriComponents from Spring Framework capable of handling both URIs:

String uri = ...
UriComponents uriComponents = UriComponentsBuilder.fromUriString(uri).build();

You can check the code to see what it does.

edited Feb 20, 2020 at 17:03

answered Feb 20, 2020 at 16:41

cassiomolin

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JMax Over a year ago

If you are on a non-Spring application the library org.springframework:spring-web and it's dependencies are a big bunch of code (~3.4MB at the moment for 5.2.3) just for parsing URIs. But the Regex pattern URI_PATTERN in the linked code and the fromUriString(String) method seems to be of great value. And it is under Apache 2 license :)

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