zoukankan html css js c++ java

网站访问计数器

文章来源于：http://songjianyong.iteye.com/blog/930091

Java代码：

package test;   
  
import java.io.BufferedReader;   
import java.io.BufferedWriter;   
import java.io.FileReader;   
import java.io.FileWriter;   
  
public class CounterBean {   
    private String path;//文件全路径   
    private String write;//要向文件写入的内容   
    private String read;//从文件读取的内容   
       
    public CounterBean(){}   
       
    public int readFile(){//从文件读取内容   
        try {   
            FileReader freader = new FileReader(path);   
            BufferedReader breader = new BufferedReader(freader);   
            read = breader.readLine();System.out.println("1 read="+read);   
            String line = breader.readLine();System.out.println("2 line="+line);   
            while(line!=null){   
                read = read+"<br>"+line;System.out.println("3 read="+read);   
                line = breader.readLine();System.out.println("4 line="+line);   
            }   
            breader.close();   
            freader.close();   
            return 0;   
        } catch (Exception e) {   
            return -1;   
        }   
    }   
       
    public int writeOver(){//向文件写入内容（write），原来内容将会被冲掉   
        try {   
            FileWriter fwriter = new FileWriter(path);   
            BufferedWriter bwrite = new BufferedWriter(fwriter);   
            bwrite.write(write, 0, write.length());   
            bwrite.flush();   
            bwrite.close();   
            return 0;   
        } catch (Exception e) {   
            return -1;   
        }   
    }   
       
    public int writeAppend(){//向文件追加写入内容（write），本次没有用到该方法   
        try {   
            FileWriter fwrite = new FileWriter(path);   
            BufferedWriter bwrite = new BufferedWriter(fwrite);   
            bwrite.newLine();   
            bwrite.write(write, 0, write.length());   
            bwrite.flush();   
            bwrite.close();   
            return 0;   
        } catch (Exception e) {   
            return -1;   
        }   
    }   
       
    public String getPath() {   
        return path;   
    }   
    public void setPath(String path) {   
        this.path = path;   
    }   
    public String getWrite() {   
        return write;   
    }   
    public void setWrite(String write) {   
        this.write = write;   
    }   
    public String getRead() {   
        return read;   
    }   
    public void setRead(String read) {   
        this.read = read;   
    }   
       
}

jsp代码

html代码

<%@ page language="java" pageEncoding="gb2312"%>  
<jsp:useBean id = "counterBean" class="test.CounterBean"></jsp:useBean>  
<html>  
  <head>  
    <title>计数器</title>  
  <%!   
  String filePath;   
  %>  
  </head>  
  <body>  
    <center>  
        <%   
filePath =request.getRealPath("/")+"WEB-INF\count.txt";   
        counterBean.setPath(filePath);   
        counterBean.readFile();   
        int count = Integer.parseInt(counterBean.getRead())+1;   
        counterBean.setWrite(String.valueOf(count));   
        counterBean.writeOver();   
        out.print("总共访问人数："+count);   
        %>  
    </center>  
  </body>  
</html>

查看全文

相关阅读:
对JAVA集合进行遍历删除时务必要用迭代器
 设计模式之单例模式(线程安全)
List、Set、Map 和 Queue 之间的区别
 HashMap和Hashtable的区别
 Java WeakReference的理解与使用
 Java 理论与实践: 正确使用 Volatile 变量
 java中volatile关键字的含义
 最近5年183个Java面试问题列表及答案［最全］
淘宝一月上钻是这样操作的
 Revit API找到风管穿过的墙(当前文档和链接文档)

原文地址：https://www.cnblogs.com/lyc-hp/p/3368752.html