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" %>    <%    // 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%>

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

      
     
      Archetype Created Web Application
       
         
      
       he
          
      
       /WEB-INF/he.jsp
        
       
         
      
       he
          
      
       /hello
        
     
    

直接更新,但不重启,发现不能加载.

config

config用于获得