Standard URL Normalization - Java

As others have mentioned, java.net.URL and/or java.net.URI are some obvious starting points.

Here some other options:

1. Galimatias (Spanish for "gibberish") appears to be an opinionated and relatively popular URL normalization library for Java. The source code can be found at github.com/smola/galimatias.

   galimatias started out of frustration with java.net.URL and java.net.URI. Both of them are good for basic use cases, but severely broken for others

2. The github.com/sentric/url-normalization library provides another (unusual, in my opinion) approach where it reverses the domain portion; e.g. "com.stackoverflow" instead of "stackoverflow.com".

You can find other variations, sometimes implemented in languages such as Python, Ruby, and PHP on Github.

URI uri = URI.create("http://www.example.com:8040/folder/exist?name=sky#head");
String scheme = uri.getScheme();
String authority = uri.getAuthority();
// ...

https://docs.oracle.com/javase/1.5.0/docs/api/java/net/URI.html