package ${enclosing_package};

import java.io.IOException;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.Filter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class ${primary_type_name} implements Filter{

    public ${primary_type_name}(){
        super();
    }
    private FilterConfig filterConfig;

    public void init(FilterConfig filterConfig) throws ServletException{

        this.filterConfig = filterConfig;

    }

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain){

        try{

            HttpServletRequest request = (HttpServletRequest) req;

            HttpServletResponse response = (HttpServletResponse) res;

            HttpSession session = request.getSession();

            // 这里放到达目的地前(进入)处理代码   

            filterChain.doFilter(req, res);

            // 这里放到达目的地(离开)的处理代码   

        } catch (IOException e){

            e.printStackTrace();

        } catch (ServletException e){

            e.printStackTrace();
        }

    }

    public void destroy(){

    }
}

package ${enclosing_package};

import java.io.IOException;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.Filter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class ${primary_type_name} implements Filter {

    public ${primary_type_name}() {
        super();
    }
    private FilterConfig filterConfig;

    public void init(FilterConfig filterConfig) throws ServletException {

        this.filterConfig = filterConfig;

    }
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException, ServletException {

            HttpServletRequest request = (HttpServletRequest) req;

            HttpServletResponse response = (HttpServletResponse) res;

            HttpSession session = request.getSession();

            // 这里放到达目的地前(进入)处理代码   

            filterChain.doFilter(req, res);

            // 这里放到达目的地(离开)的处理代码   
    }

    public void destroy() {

    }
}