How to encode URL in Groovy?

Question

You could use java.net.URLEncoder.

In your example above, the brackets must be encoded too:

def toEncode = "dehydrogenase (NADP+)"
assert java.net.URLEncoder.encode(toEncode, "UTF-8") == "dehydrogenase+%28NADP%2B%29"

You could also add a method to string’s metaclass:

String.metaClass.encodeURL = {
   java.net.URLEncoder.encode(delegate, "UTF-8")
}

And simple call encodeURL() on any string:

def toEncode = "dehydrogenase (NADP+)"
assert toEncode.encodeURL() == "dehydrogenase+%28NADP%2B%29"