Hi!
Take a look at the Apache Woden project which features:
- Reading WSDL documents.
- Writing WSDL documents.
- Manipulating WSDL documents.
- Creating WSDL documents.
http://ws.apache.org/woden/
If Woden does not suit your needs, then any XML parser can read XML documents since WSDL is XML - it all depends on what you want to do.
Best wishes!