摘要：站點(diǎn)的網(wǎng)站計(jì)數(shù)器的操作下午定義全局變量獲取計(jì)數(shù)器若文件存在則讀取獲取到文件的輸入流對(duì)計(jì)數(shù)器內(nèi)容進(jìn)行加計(jì)數(shù)文件保存回文件流中輸入對(duì)象獲取文件路徑定義對(duì)象進(jìn)行加您是第映射文件保存在文件夾下永遠(yuǎn)無法訪問此時(shí)需要修改文件即可達(dá)到映

站點(diǎn)的網(wǎng)站計(jì)數(shù)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" %>


    


<%
    // 定義全局變量
    BigInteger count = null;
%>
<%!
    // 獲取計(jì)數(shù)器
    public BigInteger load(File file){
        BigInteger count = null;
        try{
            // 若文件存在則讀取
            if(file.exists()){
                Scanner scanner = null;
                // 獲取到文件的輸入流
                scanner = new Scanner(new FileInputStream(file));
                // 對(duì)計(jì)數(shù)器內(nèi)容進(jìn)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;
    }
    // 計(jì)數(shù)文件保存回文件
    public void save(File file, BigInteger count){
        try{
            PrintStream printStream = null;
            printStream = new PrintStream(new FileOutputStream(file));
            // 流中輸入對(duì)象
            printStream.println(count);
            printStream.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
%>
<%
    // 獲取文件路徑
    String fileName = this.getServletContext().getRealPath("/") + "count.txt";
    // 定義file對(duì)象
    File file = new File(fileName);
    // 進(jìn)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%>

文件保存在WEB-INF文件夾下,永遠(yuǎn)無法訪問,此時(shí),需要修改/WEB-INF/web.xml文件即可,達(dá)到映射的目的
修改xml文件如下

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

直接更新,但不重啟,發(fā)現(xiàn)不能加載.
此時(shí).即Tomcat需要重寫配置屬性
此時(shí)訪問
http://localhost:8080/hello
即可訪問

config用于獲得