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cicadasmile
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JavaEE基础(05)：过滤器、监听器、拦截器，应用详解
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‎java-ee-base-parent/node05-servlet-filter/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java-ee-base-parent</artifactId>
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<groupId>com.java.ee.parent</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.node05.filter</groupId>
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<artifactId>node05-servlet-filter</artifactId>
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<packaging>war</packaging>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<jstl.version>1.2</jstl.version>
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<servlet-api.version>2.5</servlet-api.version>
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<jsp-api.version>2.0</jsp-api.version>
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</properties>
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<dependencies>
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<!-- JSP相关 依赖包-->
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<dependency>
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<groupId>jstl</groupId>
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<artifactId>jstl</artifactId>
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<version>${jstl.version}</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>jsp-api</artifactId>
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<version>${jsp-api.version}</version>
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<scope>provided</scope>
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</dependency>
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<!-- servlet依赖包 -->
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>${servlet-api.version}</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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</dependency>
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</dependencies>
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</project>

‎java-ee-base-parent/node05-servlet-filter/src/main/java/com/node05/servlet/filter/ThePrintLogFilter.java

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package com.node05.servlet.filter;
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import javax.servlet.*;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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public class ThePrintLogFilter implements Filter {
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@Override
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public void init(FilterConfig filterConfig) throws ServletException {
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String myName = filterConfig.getInitParameter("myName") ;
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System.out.println("myName："+myName);
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}
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@Override
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public void doFilter(ServletRequest servletRequest,
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ServletResponse servletResponse,
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FilterChain chain) throws IOException, ServletException {
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HttpServletRequest request = (HttpServletRequest)servletRequest ;
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HttpServletResponse response = (HttpServletResponse)servletResponse ;
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String name = request.getParameter("name") ;
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if (!name.equals("cicada")){
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response.getWriter().print("User Error !");
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return ;
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}
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chain.doFilter(servletRequest,servletResponse);
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}
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@Override
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public void destroy() {
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System.out.println("ThePrintLogFilter destroy()");
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}
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}

‎java-ee-base-parent/node05-servlet-filter/src/main/java/com/node05/servlet/impl/FilterServletImpl.java

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package com.node05.servlet.impl;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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public class FilterServletImpl extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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response.getWriter().print("Hello:Filter");
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}
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}

‎java-ee-base-parent/node05-servlet-filter/src/main/java/com/node05/servlet/impl/ListenerServletImpl.java

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package com.node05.servlet.impl;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.*;
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import java.io.IOException;
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public class ListenerServletImpl extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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// 1、获取TheContextListener初始化数据
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ServletContext servletContext = this.getServletContext() ;
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String author = String.valueOf(servletContext.getAttribute("author")) ;
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System.out.println("TheContextListener Author:"+author);
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// 2、Request属性设置
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request.setAttribute("mood","smile");
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request.setAttribute("mood","agitated");
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// 3、Session创建，1分钟失效，调用销毁
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HttpSession session = request.getSession(true) ;
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session.setAttribute("casually","casually");
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response.getWriter().print("Hello:Listener");
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}
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}

‎java-ee-base-parent/node05-servlet-filter/src/main/java/com/node05/servlet/listener/RequestAttributeListener.java

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package com.node05.servlet.listener;
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import javax.servlet.ServletRequestAttributeEvent;
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import javax.servlet.ServletRequestAttributeListener;
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/**
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* Request属性监听
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*/
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public class RequestAttributeListener implements ServletRequestAttributeListener {
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@Override
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public void attributeAdded(ServletRequestAttributeEvent evt) {
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System.out.println("Request添加属性："+evt.getName()+";"+evt.getValue());
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}
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@Override
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public void attributeRemoved(ServletRequestAttributeEvent evt) {
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System.out.println("Request移除属性："+evt.getName()+";"+evt.getValue());
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}
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@Override
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public void attributeReplaced(ServletRequestAttributeEvent evt) {
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System.out.println("Request替换属性："+evt.getName()+";"+evt.getValue());
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}
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}

‎java-ee-base-parent/node05-servlet-filter/src/main/java/com/node05/servlet/listener/TheContextListener.java

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package com.node05.servlet.listener;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletContextEvent;
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import javax.servlet.ServletContextListener;
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public class TheContextListener implements ServletContextListener {
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@Override
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public void contextInitialized(ServletContextEvent servletContextEvent) {
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System.out.println("初始化：TheContextListener");
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ServletContext servletContext = servletContextEvent.getServletContext() ;
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servletContext.setAttribute("author","cicada");
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}
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@Override
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public void contextDestroyed(ServletContextEvent servletContextEvent) {
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System.out.println("销毁：TheContextListener");
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}
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}

‎java-ee-base-parent/node05-servlet-filter/src/main/java/com/node05/servlet/listener/TheRequestListener.java

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package com.node05.servlet.listener;
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import javax.servlet.ServletRequestEvent;
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import javax.servlet.ServletRequestListener;
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public class TheRequestListener implements ServletRequestListener {
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@Override
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public void requestDestroyed(ServletRequestEvent servletRequestEvent) {
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System.out.println("初始化：TheRequestListener");
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}
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@Override
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public void requestInitialized(ServletRequestEvent servletRequestEvent) {
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System.out.println("销毁：TheRequestListener");
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}
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}

‎java-ee-base-parent/node05-servlet-filter/src/main/java/com/node05/servlet/listener/TheSessionListener.java

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package com.node05.servlet.listener;
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import javax.servlet.http.HttpSessionEvent;
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import javax.servlet.http.HttpSessionListener;
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public class TheSessionListener implements HttpSessionListener {
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@Override
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public void sessionCreated(HttpSessionEvent httpSessionEvent) {
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System.out.println("初始化：TheSessionListener");
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}
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@Override
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public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
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System.out.println("销毁：TheSessionListener");
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}
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}

‎java-ee-base-parent/node05-servlet-filter/src/main/webapp/WEB-INF/web.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://java.sun.com/xml/ns/javaee"
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
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id="WebApp_ID" version="3.0">
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<display-name>cicada_servlet</display-name>
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<context-param>
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<param-name>encoding</param-name>
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<param-value>UTF-8</param-value>
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</context-param>
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<!-- 监听器相关配置 -->
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<listener>
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<listener-class>com.node05.servlet.listener.TheContextListener</listener-class>
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</listener>
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<listener>
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<listener-class>com.node05.servlet.listener.TheSessionListener</listener-class>
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</listener>
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<listener>
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<listener-class>com.node05.servlet.listener.TheRequestListener</listener-class>
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</listener>
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<listener>
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<listener-class>com.node05.servlet.listener.RequestAttributeListener</listener-class>
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</listener>
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<session-config>
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<!-- 设置session失效时间为1分钟 -->
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<session-timeout>1</session-timeout>
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</session-config>
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<!-- 过滤器相关配置 -->
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<filter>
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<filter-name>thePrintLogFilter</filter-name>
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<filter-class>com.node05.servlet.filter.ThePrintLogFilter</filter-class>
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<init-param>
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<param-name>myName</param-name>
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<param-value>cicada</param-value>
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</init-param>
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</filter>
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<filter-mapping>
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<filter-name>thePrintLogFilter</filter-name>
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<url-pattern>/filterServletImpl</url-pattern>
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</filter-mapping>
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<!-- Servlet相关配置 -->
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<servlet>
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<servlet-name>listenerServletImpl</servlet-name>
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<servlet-class>com.node05.servlet.impl.ListenerServletImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>listenerServletImpl</servlet-name>
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<url-pattern>/listenerServletImpl</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>filterServletImpl</servlet-name>
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<servlet-class>com.node05.servlet.impl.FilterServletImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>filterServletImpl</servlet-name>
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<url-pattern>/filterServletImpl</url-pattern>
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</servlet-mapping>
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</web-app>

‎java-ee-base-parent/node05-servlet-filter/src/main/webapp/index.jsp

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<html>
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<body>
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<hr/>
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<h2> Filter And Listener </h2>
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<hr/>
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</body>
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</html>

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