页面访问统计

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ex2_1.jsp

<%@ page contentType="text/html;charset=gb2312"%>
<HTML><BODY bgcolor=#33ccff>
<%!int i=0;%>
<%
i++;
%>

<p>you are the <%=i%> user visited the page.
</BODY></HTML>

ex2_2.jsp

<%@ pagecontentType="text/html;charset=gb2312"%>
<HTML><BODY >
<%!int number=0;
   synchronized void countPeople()
   {
    number++;}
   %>
<%
countPeople();
%>

<p>you are the <%=number%> user visited thepage.
</BODY></HTML>

重点：利用输入输出流
ex2_2.jsp

<%@ pagecontentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*"%>
<HTML>
<BODY>
<%!int number = 0;

File file = new File("count.txt");

synchronized void countPeople() {
   if (!file.exists()) {
    number++;
    try {
     file.createNewFile();
     FileOutputStream out = newFileOutputStream("count.txt");
     DataOutputStream dateOut = new DataOutputStream(out);
     dateOut.writeInt(number);
     out.close();
     dateOut.close();

    } catch (IOException ee) {
    }
   } else {
    try {
     FileInputStream in = newFileInputStream("count.txt");
     DataInputStream dataIn = new DataInputStream(in);
     number = dataIn.readInt();
     number++;
     in.close();
     dataIn.close();
     FileOutputStream out = newFileOutputStream("count.txt");
     DataOutputStream dataOut = new DataOutputStream(out);
     dataOut.writeInt(number);
     out.close();
     dataOut.close();
    } catch (IOException ee) {
    }
   }

}%>

   <%
   countPeople();
   %>

   <p>
    you are the
    <%=number%>
    user visited the page.
</BODY>
</HTML>