<%-- 网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> author yeeku.H.lee kongyeeku@163.com version 1.0 Copyright (C), 2001-2016, yeeku.H.Lee This program is protected by copyright laws. Program Name: Date: --%> <%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Filter测试</title> <meta name="website" content="http://www.crazyit.org" /> </head> <body> <h2>Filter页面</h2> </body> </html>
<%-- 网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> author yeeku.H.lee kongyeeku@163.com version 1.0 Copyright (C), 2001-2016, yeeku.H.Lee This program is protected by copyright laws. Program Name: Date: --%> <%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>登录页面</title> <meta name="website" content="http://www.crazyit.org" /> </head> <body> <h2>登录页面</h2> <% if(request.getAttribute("tip") != null) { out.println("<font color='red'>" + request.getAttribute("tip") + "</font>"); } %> <form method="post" action="proLogin.jsp"> 用户名:<input type="text" name="name"/><br/> <input type="submit" value="登录"/> </form> </body> </html>
<%-- 网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> author yeeku.H.lee kongyeeku@163.com version 1.0 Copyright (C), 2001-2016, yeeku.H.Lee This program is protected by copyright laws. Program Name: Date: --%> <%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title> 登录页面 </title> <meta name="website" content="http://www.crazyit.org" /> </head> <body> <h2>登录页面</h2> <% session.setAttribute("user" , request.getParameter("name")); %> 登录成功，可以访问该应用的其他页面 </body> </html>
<?xml version="1.0" encoding="GBK"?> <!-- 定义生成文件的project根元素，默认的target为空 --> <project name="web" basedir="." default=""> <!-- 定义三个简单属性 --> <property name="src" value="src"/> <property name="classes" value="classes"/> <!-- 定义一组文件和目录集 --> <path id="classpath"> <fileset dir="lib"> <include name="**/*.jar"/> </fileset> <pathelement path="${classes}"/> </path> <!-- 定义compile target，用于编译Java源文件 --> <target name="compile" description="编译Java源文件"> <!-- 先删除classes属性所代表的文件夹 --> <delete dir="${classes}"/> <!-- 创建classes属性所代表的文件夹 --> <mkdir dir="${classes}"/> <copy todir="${classes}"> <fileset dir="${src}"> <exclude name="**/*.java"/> </fileset> </copy> <!-- 编译Java文件，编译后的class文件放到classes属性所代表的文件夹内 --> <javac destdir="${classes}" debug="true" includeantruntime="yes" deprecation="false" optimize="false" failonerror="true"> <!-- 指定需要编译的Java文件所在的位置 --> <src path="${src}"/> <!-- 指定编译Java文件所需要第三方类库所在的位置 --> <classpath refid="classpath"/> </javac> </target> </project>
<?xml version="1.0" encoding="GBK"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <!-- 定义Filter --> <filter> <!-- Filter的名字，相当于指定@WebFilter 的filterName属性 --> <filter-name>log</filter-name> <!-- Filter的实现类 --> <filter-class>lee.LogFilter</filter-class> </filter> <!-- 定义Filter拦截的URL地址 --> <filter-mapping> <!-- Filter的名字 --> <filter-name>log</filter-name> <!-- Filter负责拦截的URL，相当于指定@WebFilter 的urlPatterns属性 --> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 定义Filter --> <filter> <!-- Filter的名字 --> <filter-name>authority</filter-name> <!-- Filter的实现类 --> <filter-class>lee.AuthorityFilter</filter-class> <!-- 下面三个init-param元素配置了三个参数 --> <init-param> <param-name>encoding</param-name> <param-value>GBK</param-value> </init-param> <init-param> <param-name>loginPage</param-name> <param-value>/login.jsp</param-value> </init-param> <init-param> <param-name>proLogin</param-name> <param-value>/proLogin.jsp</param-value> </init-param> </filter> <!-- 定义Filter拦截的URL地址 --> <filter-mapping> <!-- Filter的名字 --> <filter-name>authority</filter-name> <!-- Filter负责拦截的URL --> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
package lee; import javax.servlet.*; import javax.servlet.http.*; import javax.servlet.annotation.*; import java.io.*; /** * Description: * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author Yeeku.H.Lee kongyeeku@163.com * @version 1.0 */ @WebFilter(filterName="authority" , urlPatterns={"/*"} , initParams={ @WebInitParam(name="encoding", value="GBK"), @WebInitParam(name="loginPage", value="/login.jsp"), @WebInitParam(name="proLogin", value="/proLogin.jsp")}) public class AuthorityFilter implements Filter { // FilterConfig可用于访问Filter的配置信息 private FilterConfig config; // 实现初始化方法 public void init(FilterConfig config) { this.config = config; } // 实现销毁方法 public void destroy() { this.config = null; } // 执行过滤的核心方法 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,ServletException { // 获取该Filter的配置参数 String encoding = config.getInitParameter("encoding"); String loginPage = config.getInitParameter("loginPage"); String proLogin = config.getInitParameter("proLogin"); // 设置request编码用的字符集 request.setCharacterEncoding(encoding); // ① HttpServletRequest requ = (HttpServletRequest)request; HttpSession session = requ.getSession(true); // 获取客户请求的页面 String requestPath = requ.getServletPath(); // 如果session范围的user为null，即表明没有登录 // 且用户请求的既不是登录页面，也不是处理登录的页面 if( session.getAttribute("user") == null && !requestPath.endsWith(loginPage) && !requestPath.endsWith(proLogin)) { // forward到登录页面 request.setAttribute("tip" , "您还没有登录"); request.getRequestDispatcher(loginPage) .forward(request, response); } // "放行"请求 else { chain.doFilter(request, response); } } }
package lee; import javax.servlet.*; import javax.servlet.http.*; import javax.servlet.annotation.*; import java.io.*; /** * Description: * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author Yeeku.H.Lee kongyeeku@163.com * @version 1.0 */ @WebFilter(filterName="log" ,urlPatterns={"/*"}) public class LogFilter implements Filter { // FilterConfig可用于访问Filter的配置信息 private FilterConfig config; // 实现初始化方法 public void init(FilterConfig config) { this.config = config; } // 实现销毁方法 public void destroy() { this.config = null; } // 执行过滤的核心方法 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,ServletException { // ---------下面代码用于对用户请求执行预处理--------- // 获取ServletContext对象，用于记录日志 ServletContext context = this.config.getServletContext(); long before = System.currentTimeMillis(); System.out.println("开始过滤..."); // 将请求转换成HttpServletRequest请求 HttpServletRequest hrequest = (HttpServletRequest)request; // 输出提示信息 System.out.println("Filter已经截获到用户的请求的地址： " + hrequest.getServletPath()); // Filter只是链式处理，请求依然放行到目的地址 chain.doFilter(request, response); // ---------下面代码用于对服务器响应执行后处理--------- long after = System.currentTimeMillis(); // 输出提示信息 System.out.println("过滤结束"); // 输出提示信息 System.out.println("请求被定位到" + hrequest.getRequestURI() + " 所花的时间为: " + (after - before)); } }