過濾器：網絡通信模型的會話層控制；
攔截器：事務處理的aop注入（生命周期監控）。
對於Servlet Filter，官方文檔中說的很好， 並且給出了常見的應用場景。
A filter is an object that performs filtering tasks on either the request to a resource (a servlet or static content), or on the response from a resource, or both. Filters perform filtering in the doFilter method. Every Filter has access to a FilterConfig object from which it can obtain its initialization parameters, and a reference to the ServletContext which it can use, for example, to load resources needed for filtering tasks.
Filters are configured in the deployment descriptor of a web application.
Examples that have been identified for this design are:
- Authentication Filters
- Logging and Auditing Filters
- Image conversion Filters
- Data compression Filters
- Encryption Filters
- Tokenizing Filters
- Filters that trigger resource access events
- XSL/T filters
- Mime-type chain Filter
過濾器和攔截器的執行順序
https://www.bbsmax.com/A/QW5Y046GJm/
https://my.oschina.net/zdtdtel/blog/3025880