Consume SAMLResponse Token

SAML sp-based authentication has following short workflow.

User wants to access application at sp.
sp sends SAMLRequest token to idp.
idp consume it and generate SAMLResponse token.
idp sends this SAMLResponse token to AC-URL given by sp.

My Question is how sp consume this SAMLResponse token. What is the logic? If I can get some JAVA code help it will be beneficial.

How do I use SAML response?

User is redirected to the login page. User enters credentials which are posted to our server-side identity provider. If the user is authenticated, the identity provider returns a SAML response to the client. Client posts the SAML response to the service provider.

Here is how I do it in Java. I use XMLBeans to parse the SAMLResponse, then decrypt it (if it's encrypted) and then verify the signature:

WebBrowserSSOAuthConsumerService