code061.java

package pack01;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;


public class code061 implements Filter
{
    private int count;  // ������Ա����

    @Override
    public void init(FilterConfig filterConfig) throws ServletException
    {
        String param = filterConfig.getInitParameter("countx1"); //��web.xml�����ļ���ȡ�ò���ֵ
        this.count = Integer.valueOf(param); //��ֵ
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException
    {
        this.count++;
        HttpServletRequest req = (HttpServletRequest)request;
        ServletContext context = req.getSession().getServletContext();
        context.setAttribute("countx2", this.count);
        chain.doFilter(request, response);


    }

    @Override
    public void destroy()
    {

    }

    /*
     * ����tomcat��������web.xml�����ļ��а������½�������
     *<filter>
     *    <filter-name>code061</filter-name>
     *    <filter-class>pack01.code061</filter-class>
     *    <init-param>
     *        <param-name>countx1</param-name>
     *        <param-value>3000</param-value>
     *    </init-param>
     *</filter>
     *<filter-mapping>
     *    <filter-name>code061</filter-name>
     *    <url-pattern>/page04/code062.jsp</url-pattern>
     *</filter-mapping>
     *</web-app>
     * 
     * 
     * 
     * 
     */
}