write.jsp

一本书中的原代码,有用多例子,很好用

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%!
public int[] getNumber(String s)
{
int[] mCount = new int[4];
String strTemp = null;
int i;
java.io.RandomAccessFile rf = null;
try
{
rf = new java.io.RandomAccessFile(s,"r");
} catch(Exception e){}
for(i=0;i<4;i++) 
{
try {
strTemp = rf.readLine();
} catch(Exception e) {}
if(strTemp==null)strTemp = "0";
mCount[i] = new Integer(strTemp).intValue();
}
return mCount;
}
public void setNumber(String s,int[] x)
{
try
{
java.io.PrintWriter pw = new java.io.PrintWriter(new java.io.FileOutputStream(s));
for (int i=0;i<4;i++)
{
pw.println(x[i]+"");
}
pw.close();
} catch(Exception e) {}
}
%>

<%
String tmp = null;
int choice = -1;
int[] count = new int[4];
tmp = request.getParameter("choice");
if (tmp==null)
{
} else
{
choice = new Integer(tmp).intValue();
}
String s = request.getRealPath("count.txt");
if(choice>=0)
{
count = getNumber(s);
count[choice]++;
setNumber(s,count);
}
response.sendRedirect("index.jsp");
%>