I have a java.net.URL object that uses the HTTPS protocol, e.g.:
https://www.bla.com
And I have to change only the protocol part of this URL object so that when I call its toString() method I get this:
http://www.bla.com
What is the best way to do that?
You'll have the use the methods available to you:
URL oldUrl = new URL("https://www.bla.com");
URL newUrl = new URL("http", oldUrl.getHost(), oldUrl.getPort(), oldUrl.getFile(), oldUrl.getRef());
There's an even more expansive set() method that takes 8 items, you might need that for more elaborate URLs.
Edit: As was just pointed out to me, I wasn't paying attention, and set() is protected. So URL is technically mutable, but to us mortals, it's immutable. So you'll just have to construct a new URL object.
set() method is protected.
You can also use string replacement:
URL oldUrl = new URL("https://www.bla.com");
String newUrlString = oldUrl.toString().replaceFirst("^https", "http");
URL newUrl = new URL(newUrlString);
String url - "https://www.some-host.com/some-path?somequery=some-value";
String newUrl = UriComponentsBuilder.newInstance()
.fromUriString(url)
.scheme("http")
.build()
.toUriString();
It'll just replace scheme and rest url will remain as-is
Or you can use org.springframework.web.util.UriComponentsBuilder/ org.springframework.web.util.UriComponents
It appears they forgot to make their class useful. Stealing code from URL.toExternalForm() helps:
public class ICantBelieveThisIsNotInTheStandardLibrary {
public static final URL makeCopyWithDifferentProtocol(URL u, String protocol) {
StringBuffer result = new StringBuffer();
result.append(protocol);
result.append(":");
if (u.getAuthority() != null && u.getAuthority().length() > 0) {
result.append("//");
result.append(u.getAuthority());
}
if (u.getPath() != null) {
result.append(u.getPath());
}
if (u.getQuery() != null) {
result.append('?');
result.append(u.getQuery());
}
if (u.getRef() != null) {
result.append("#");
result.append(u.getRef());
}
return new URL(result.toString());
}
}
The answer which suggests to use a String-replacement is shorter, but you are going to need something like this if you ever want to change any of the other URL components.
