How to get the domain name from the request in a Java servlet?

问题

If a single servlet serves data from two domains example1.com and example2.com, how do you retrieve the domain information from the request in a Java servlet?

The purpose is to perform different actions depending on the domain.

回答1:

Very easy, javax.servlet.ServletRequest.getServerName(). It also provides further methods to retrieve request information, getScheme(), getServerPort()...

Edit: If you have a web server guarding your application server, it must be configured to support this, otherwise getServerName() returns the name of your application server which may not be what you want...

来源：https://stackoverflow.com/questions/7300670/how-to-get-the-domain-name-from-the-request-in-a-java-servlet