JavaWeb19.2【Filter&Listener：過濾器Filter的執行流程和生命週期方法】
阿新 • • 發佈：2021-07-05
1 package com.haifei.web.filter; 2 3 import javax.servlet.*; 4 import javax.servlet.annotation.WebFilter; 5 import java.io.IOException; 6 7 /** 8 * 過濾器細節細節 之 過濾器執行流程 9 * 1. 執行過濾器 10 * 2. 執行放行後的資源 11 * 3. 回來執行過濾器放行程式碼下邊的程式碼 12 */ 13 //@WebFilter("/*") 14 public class FilterDemo2 implementsFilter { 15 public void destroy() { 16 } 17 18 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException { 19 20 //對request物件的請求訊息增強 21 22 System.out.println("FilterDemo2..."); 23 24 chain.doFilter(req, resp); //IDEA"註解模式Filter"程式碼快速建立模板 自帶放行語句 25 26 //對response物件的響應訊息增強 27 28 System.out.println("FilterDemo2...回來了。。。"); 29 30 /* 31 http://localhost:8080/day19/index.jsp 32 33 FilterDemo2... 34 index.jsp 35 FilterDemo2...回來了。。。 36 */ 37 } 38 39 publicvoid init(FilterConfig config) throws ServletException { 40 41 } 42 43 }
1 <%-- 2 Created by IntelliJ IDEA. 3 User: yubaby 4 Date: 2021/7/4 5 Time: 21:35 6 To change this template use File | Settings | File Templates. 7 --%> 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 9 <html> 10 <head> 11 <title>$Title$</title> 12 </head> 13 <body> 14 index.jsp 15 16 <% 17 System.out.println("index.jsp"); 18 %> 19 </body> 20 </html>