Using Liferay often does not use Liferay to re-develop a set of systems, many times is to use Liferay to develop a set of centralized processing dashboard, so there will always be a user authentication problem, it would have their own system user authentication, Then Liferay also have their own user authentication, at this time the unification of the two systems will appear particularly important, check the network, the vast majority of the article is about SSO, the basic is the CAs and Opensso two, but both need to take the server, and then through the server to verify and then return, There is still no way to avoid the problem of the original system integration.
The idea here is to call Liferay's API to create a user when creating a user, and then the user can seamlessly log in to Liferay with the same username and password when logging in. The following material is the process of creating a user using the Liferay API.
Http://tanajilondhe.blogspot.com/2013/01/liferay-add-user-programmatically.html
Liferay Trial Series-user authentication is the first thing to be done