package cn.itcast.web.filter;

import java.io.IOException;

import javax.servlet.DispatcherType;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

/**
?* 表示瀏覽器直接請(qǐng)求index.jsp資源時(shí)，過濾器會(huì)被執(zhí)行
?* Servlet Filter implementation class FilterDemo5
?*/
//@WebFilter(value="/index.jsp",dispatcherTypes=DispatcherType.REQUEST)
//只有轉(zhuǎn)發(fā)訪問index.jsp時(shí)，該過濾器才會(huì)被執(zhí)行
//@WebFilter(value="/index.jsp",dispatcherTypes=DispatcherType.FORWARD)
//瀏覽器直接請(qǐng)求index.jsp和轉(zhuǎn)發(fā)訪問index.jsp都會(huì)被執(zhí)行
//@WebFilter(value="/index.jsp",dispatcherTypes= {DispatcherType.FORWARD,DispatcherType.REQUEST})
@WebFilter(value="/*",dispatcherTypes= {DispatcherType.FORWARD,DispatcherType.REQUEST})
public class FilterDemo5 implements Filter {

??? /**
???? * Default constructor.
???? */
??? public FilterDemo5() {
??????? // TODO Auto-generated constructor stub
??? }

?? ?/**
?? ? * @see Filter#destroy()
?? ? */
?? ?public void destroy() {
?? ??? ?// TODO Auto-generated method stub
?? ?}

?? ?/**
?? ? * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
?? ? */
?? ?public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
?? ??? ?System.out.println("FilterDemo5...");
?? ??? ?chain.doFilter(request, response);
?? ?}

?? ?/**
?? ? * @see Filter#init(FilterConfig)
?? ? */
?? ?public void init(FilterConfig fConfig) throws ServletException {
?? ??? ?// TODO Auto-generated method stub
?? ?}

}

package cn.itcast.web.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
?* Servlet implementation class ServletDemo2
?*/
@WebServlet("/user/updateServlet")
public class ServletDemo2 extends HttpServlet {
?? ?private static final long serialVersionUID = 1L;
????? ?
??? /**
???? * @see HttpServlet#HttpServlet()
???? */
??? public ServletDemo2() {
??????? super();
??????? // TODO Auto-generated constructor stub
??? }

?? ?/**
?? ? * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
?? ? */
?? ?protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
?? ??? ?System.out.println("updateServlet...");
?? ??? ?//轉(zhuǎn)發(fā)到index.jsp
?? ??? ?request.getRequestDispatcher("../index.jsp").forward(request, response);
?? ?}

?? ?/**
?? ? * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
?? ? */
?? ?protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?doGet(request, response);
?? ?}

}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0">
? <display-name>day19</display-name>
? <welcome-file-list>
??? <welcome-file>index.html</welcome-file>
??? <welcome-file>index.htm</welcome-file>
??? <welcome-file>index.jsp</welcome-file>
??? <welcome-file>default.html</welcome-file>
??? <welcome-file>default.htm</welcome-file>
??? <welcome-file>default.jsp</welcome-file>
? </welcome-file-list>
? <filter>
? ?? ?<filter-name>demo5</filter-name>
? ?? ?<filter-class>cn.itcast.web.filter.FilterDemo5</filter-class>
? </filter>
? <filter-mapping>
? ?? ?<filter-name>demo5</filter-name>
? ?? ?<url-pattern>/*</url-pattern>
? ?? ?<dispatcher>REQUEST</dispatcher>
? ?? ?<dispatcher>FORWARD</dispatcher>
? </filter-mapping>
</web-app>