write.jsp

投票调查 一个很简单的投票调查JSP,能在界面上用条状图显示不同问题的对比关系！

<%
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){

String strTemp = null;
int i;
java.io.RandomAccessFile rf = null;
try {
rf = new java.io.RandomAccessFile(s,"r");
} catch(Exception e)
{
System.out.println(e);
System.exit(0);
}
for(i=0;i<4;i++) 
{
try {
strTemp = rf.readLine();
} catch(Exception e) {
strTemp = "0";
}
if(strTemp==null)strTemp = "0";
count[i] = Integer.parseInt(strTemp);
}


count[choice]++;


try {
java.io.PrintWriter pw = new java.io.PrintWriter(new java.io.FileOutputStream(s));
for (i=0;i<4;i++){
pw.println(count[i]+"");
}
pw.close();
} catch(Exception e) {
System.out.println("Write file error:"+e.getMessage());
}
}

response.sendRedirect("index.jsp");
%>