* 攔截方式配置：資源被訪問(wèn)的方式
?? ?* 注解配置：
?? ??? ?* 設(shè)置dispatcherTypes屬性
?? ??? ??? ?1. REQUEST：默認(rèn)值。瀏覽器直接請(qǐng)求資源
?? ??? ??? ?2. FORWARD：轉(zhuǎn)發(fā)訪問(wèn)資源
?? ??? ??? ?3. INCLUDE：包含訪問(wèn)資源
?? ??? ??? ?4. ERROR：錯(cuò)誤跳轉(zhuǎn)資源
?? ??? ??? ?5. ASYNC：異步訪問(wèn)資源
?? ?* web.xml配置
?? ??? ?* 設(shè)置<dispatcher></dispatcher>標(biāo)簽即可
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package com.learn.web.filter;import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.IOException;import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.IOException;// 瀏覽器直接請(qǐng)求資源時(shí)，該過(guò)濾器會(huì)被執(zhí)行。 //@WebFilter(value = "/index.jsp",dispatcherTypes =DispatcherType.REQUEST) // 只有轉(zhuǎn)發(fā)訪問(wèn)index.jsp時(shí)，該過(guò)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或者轉(zhuǎn)發(fā)訪問(wèn)的index.jsp。該過(guò)濾器才會(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 {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,FilterChain filterChain) throws IOException, ServletException {System.out.println("FilterDemo5 執(zhí)行------------");filterChain.doFilter(servletRequest,servletResponse);System.out.println("FilterDemo5 回來(lái)------------");}@Overridepublic void destroy() {} } package com.learn.web.servlet;import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException;@WebServlet("/user/updateServlet") public class ServletDemo2 extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {this.doPost(req,resp);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {System.out.println("updateServlet...");// 轉(zhuǎn)發(fā)到index.jspreq.getRequestDispatcher("/index.jsp").forward(req,resp);} } // // Source code recreated from a .class file by IntelliJ IDEA // (powered by Fernflower decompiler) //package javax.servlet;public enum DispatcherType {FORWARD,INCLUDE,REQUEST,ASYNC,ERROR;private DispatcherType() {} }

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