站点的网站计数器的操作<%@ page import=“java.math.BigInteger” %><%@ page import=“java.io.File” %><%@ page import=“java.util.Scanner” %><%@ page import=“java.io.FileInputStream” %><%@ page import=“java.io.PrintStream” %><%@ page import=“java.io.FileOutputStream” %><%@ page import=“java.util.zip.InflaterOutputStream” %><%– Created by IntelliJ IDEA. User: ming Date: 19-3-12 Time: 下午10:25 To change this template use File | Settings | File Templates.–%><%@ page contentType=“text/html;charset=UTF-8” language=“java” %><html><head> <title>Title</title></head><body><% // 定义全局变量 BigInteger count = null;%><%! // 获取计数器 public BigInteger load(File file){ BigInteger count = null; try{ // 若文件存在则读取 if(file.exists()){ Scanner scanner = null; // 获取到文件的输入流 scanner = new Scanner(new FileInputStream(file)); // 对计数器内容进行加1 if(scanner.hasNext()){ count = new BigInteger(scanner.next()); } scanner.close(); }else{ count = new BigInteger(“0”); save(file, count); } }catch (Exception e){ e.printStackTrace(); } return count; } // 计数文件保存回文件 public void save(File file, BigInteger count){ try{ PrintStream printStream = null; printStream = new PrintStream(new FileOutputStream(file)); // 流中输入对象 printStream.println(count); printStream.close(); }catch (Exception e){ e.printStackTrace(); } }%><% // 获取文件路径 String fileName = this.getServletContext().getRealPath("/") + “count.txt”; // 定义file对象 File file = new File(fileName); // 进行加 if(session.isNew()) { synchronized (this) { count = load(file); System.out.println(count); count = count.add(new BigInteger(“1”)); save(file, count); } }%>您是第<%=count%></body></html>web映射文件保存在WEB-INF文件夹下,永远无法访问,此时,需要修改/WEB-INF/web.xml文件即可,达到映射的目的修改xml文件如下<!DOCTYPE web-app PUBLIC “-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN” “http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app> <display-name>Archetype Created Web Application</display-name> <servlet> <servlet-name>he</servlet-name> <jsp-file>/WEB-INF/he.jsp</jsp-file> </servlet> <servlet-mapping> <servlet-name>he</servlet-name> <url-pattern>/hello</url-pattern> </servlet-mapping></web-app>直接更新,但不重启,发现不能加载.此时.即Tomcat需要重写配置属性此时访问http://localhost:8080/hello即可访问configconfig用于获得