301跳转
1、通过apache来做，可以满足大部分业务要求
RewriteEngine On
RewriteCond %{HTTP_HOST} ^mydomain.com$
RewriteRule ^(.*)$ http://www.mydomain.com/$1 [R=301,L]
2、通过java来做,可动态的添加信息到URL中
response.setStatus(HttpServletResponse.SC_FOUND);
response.setHeader("Location", "http://www.baidu.com");
response.setHeader("Connection", "close");
