JSP网站访问计数器

 首先是JSP页面文件，代码很简单，只有几行，主要代码放在javaBean类中：

（注意我利用图片显示访问量的数字，我是放在站点的images下的digit文件夹下）

这里的第一个javaBean设置成session是让每次同一人访问只算一次，除非他关闭浏览器，再进来才算两次。

这样同一次访问，刷新页面不累计访问量。

 

<% @ page language = " java "   import = " java.util.*,java.io.* "  pageEncoding = " gb2312 " %>
<% @ taglib prefix = " c "  uri = " http://java.sun.com/jsp/jstl/core "   %>
 
< html >
  
   < head  >
     < title > LinQifo </ title >     
   </ head >
 
   < body >

< jsp:useBean id = " a "  scope = " session "   class = " linQifoP41.addone " />
< jsp:useBean id = " b "  scope = " page "   class = " linQifoP41.display " />

已经有 <% b.counter();
     for ( int  i = 9 ;i >= 0 ; -- i)
     ... {
        out.print(b.img[i]);
    }
    
  %> 人访问该网页，欢迎您！
                
</ body >
</ html >

 

接下来是addone.java类，用来使访问量+1

 

package  linQifoP41;

import  java.io. * ;

public   class  addone  ... {
        
    public addone()
    ...{
        try
        ...{
            String path="";
            File f=new File(path,"counter.txt");
            
            if(f.exists())
            ...{
                
            
            FileReader fr=new FileReader(path+"counter.txt");
            
            BufferedReader br=new BufferedReader(fr);
            String s=br.readLine();
            int i=Integer.parseInt(s);
            i++;
            System.out.print(i);
            br.close();
            s=Integer.toString(i);
            
            FileWriter fw1=new FileWriter(path+"counter.txt");
            PrintWriter pw=new PrintWriter(fw1);
            pw.println(s);
            pw.close();
            
            }
            
            else
            ...{
                
                f.createNewFile();
                FileWriter fw=new FileWriter(path+"counter.txt");
                BufferedWriter bw=new BufferedWriter(fw);
                bw.write("1");
                bw.flush();
                fw.close();    
                    
            }

        }
        catch(IOException e)
        ...{
            System.out.print(e.toString());
        }
        
        
    }
}

 

第二个是用来显示访问量结果的display.java

 

package  linQifoP41;

import  java.io. * ;

public   class  display  ... {
    
    public String[] img=new String[10];
    //读取文件    
    public void counter()
    ...{
        try
        ...{
            String path="";
            File f=new File(path+"counter.txt");
            
            if(f.exists())
            ...{
            FileReader fr=new FileReader(path+"counter.txt");
            BufferedReader br=new BufferedReader(fr);            
            String s=br.readLine();
            int i=Integer.parseInt(s);
            int st=10;
            int j=0;
            while(j<=9)
            ...{
                img[j]=Integer.toString(i%st);
                img[j]=img[j]+".jpg";
                img[j]="images/digit/"+img[j];
                img[j]="<img src="+img[j]+">";
                img[j]+="</img>";
                i/=10;
                j++;
            }
            }
            else
            ...{
                System.out.print("counter.txt文件不存在！");
            }
            
        }
        catch(IOException e)
        ...{
            System.out.print(e.toString());            
        }
    }

}