javabean模块化文字模式访问技术器（修正版）

最新推荐文章于 2022-05-20 09:48:03 发布

原创最新推荐文章于 2022-05-20 09:48:03 发布 · 949 阅读

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CC 4.0 BY-SA版权

文章标签：

#javabeans #string #generator #eclipse #class #path

本文介绍了一个使用JavaBeans实现的简单网页访问计数器。该计数器每次页面被访问时会更新本地文件中的计数，并显示当前的访问次数。

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BeansText.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312"%>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=gb2312">
    <META NAME="GENERATOR" CONTENT="Eclipse SDK">
    <title>用JavaBeans模块化得文字模式访问计数器</title>
      </head>

<body bgcolor="#ffffff">
   <jsp:useBean id="counter" scope="request" class="counter.count"/>

     <%
        counter.path="D:/eclipse/workspace/test/count.txt";
        String count=counter.doCount();
      %>
       <p align="center">
       <h1>用JavaBeans模块化得文字模式访问计数器</h1>
       <H3 align="center">你是本网页的第
       <font color="ff00001" size="5">
       <%=count%></font>
       名访客！</H3>


     </body>
</html>

count.java

package counter;
import java.io.*;

public class count extends Object
{
public String path="";
public String doCount() throws FileNotFoundException
{

  BufferedReader file;
  String countFile = path;
  file = new BufferedReader(new FileReader(countFile));
  String readStr="";
  int writeStr = 1;
  try
  {

   readStr = file.readLine();

  }
  catch(IOException e)
  {
   System.out.println("读取数据错误");
  }
  if(readStr=="")readStr = "没有任何记录";
  else
  {

   writeStr = Integer.parseInt(readStr)+1;

  }
  try
  {

   PrintWriter pw = new PrintWriter(new FileOutputStream(countFile));
   pw.println(writeStr);
   pw.close();
  }
  catch(IOException e)
  {
   System.out.println(e.getMessage());
  }
  return readStr;
}

}