Is in a filter between a client and a server resource file filters, the Servlet information interception and processing, before accessing the resource file, to modify the request judgment through a series of filters. The filter may be filtered and modified before reaching the request Servlet. You can also be filtered or modified response.
filter filter creation process:
1: Create a class that implements the interface javax.servlet.Filter;
2: implement init () method reads the filter initialization parameters;
3: implement the doFilter () method, completion response function of a filter;
4: Implementing destroy () method, the destruction of the filter.
Filter MyFilter categories:
Configuring web.xml
Open access to the project under a tomcat jsp page, the console display:
