Pardon the Information

Permanent 301 Redirect - Used to indicate than an existing page has a new home. For example, redirect a request to your new domain.

response.setStatus(301);
response.setHeader( "Location", "http://www.example.com/" );
response.setHeader( "Connection", "close" );

Temporary 302 Redirect - Used to send requests to a different location which can be used to handle errors. For example, send someone to your home page when they type in a URL that does not exist on your site.

response.sendRedirect("/");