JavaWeb19.4【Filter&Listener：Filter过滤器链(配置多个过滤器)】

 

 

package com.haifei.web.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * 过滤器链(配置多个过滤器)
 */
@WebFilter("/*")
public class FilterDemo6 implements Filter {
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        System.out.println("FilterDemo6执行了");
        chain.doFilter(req, resp);
        System.out.println("FilterDemo6回来了");
    }

    public void init(FilterConfig config) throws ServletException {

    }

    public void destroy() {

    }

}

package com.haifei.web.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * 过滤器链(配置多个过滤器)
 */
//@WebFilter("/*")
public class FilterDemo7 implements Filter {
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        System.out.println("FilterDemo7执行了");
        chain.doFilter(req, resp);
        System.out.println("FilterDemo7回来了");

        /*
        http://localhost:8080/day19/index.jsp

        FilterDemo6执行了
        FilterDemo7执行了
        index.jsp
        FilterDemo7回来了
        FilterDemo6回来了
         */
    }

    public void init(FilterConfig config) throws ServletException {

    }

    public void destroy() {

    }

}

package com.haifei.web.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * 过滤器链(配置多个过滤器)
 */
@WebFilter("/*")
public class FilterDemo17 implements Filter {
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        System.out.println("FilterDemo17执行了");
        chain.doFilter(req, resp);
        System.out.println("FilterDemo17回来了");

        /*
        http://localhost:8080/day19/index.jsp

        FilterDemo17执行了
        FilterDemo6执行了
        index.jsp
        FilterDemo6回来了
        FilterDemo17回来了
         */
    }

    public void init(FilterConfig config) throws ServletException {

    }

    public void destroy() {

    }

}