Below is my jsp file, once I process some value and display the value in jsp page. The value comes from servlet, but next time when I just enter the url the values are displayed which were there previously, so please suggest how to go about doing this?
The jsp code is :
<%@ page contentType="text/html"%>
<%@ page pageEncoding="UTF-8"%>
<%@ page import="java.util.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%
Map<String, String> reportMap = new LinkedHashMap<String, String>();
if (session.getAttribute("leaveMap") != null) {
reportMap = (Map<String,String>) session.getAttribute("leaveMap");
}
String classname="",employeeid="",employeename="";
int style =0,sno=1;
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Comparing access-card Data with leave manager Data</title>
<link href="css/sling.css" rel="stylesheet" type="text/css" />
<script language="JavaScript" src='script/cal.js'></script>
<!-- Below imports for Blanket purpose-->
<script src='script/blanket.js'></script>
<script>
var _validFileExtensions = [".xls"];
function Validate(oForm) {
var arrInputs = oForm.getElementsByTagName("input");
var filename = document.getElementById("myFile");
if(filename.value.length ==0){
alert("Please select the file to upload");
return false;
}else{
for (var i = 0; i < arrInputs.length; i++) {
var oInput = arrInputs[i];
if (oInput.type == "file") {
var sFileName = oInput.value;
if (sFileName.length > 0) {
var blnValid = false;
for (var j = 0; j < _validFileExtensions.length; j++) {
var sCurExtension = _validFileExtensions[j];
if (sFileName.substr(sFileName.length - sCurExtension.length, sCurExtension.length).toLowerCase() == sCurExtension.toLowerCase()) {
blnValid = true;
break;
}
}
if (!blnValid) {
alert("Sorry, " + sFileName + " is invalid, allowed extensions are: " + _validFileExtensions.join(", "));
return false;
}
}
}
}
}
return true;
}
function isValidDate(element){
var elementValue = element.value;
var daysInMonth = DaysArray(12);
var pos1=elementValue.indexOf(dtCh)
var pos2=elementValue.indexOf(dtCh,pos1+1)
var strDay=elementValue.substring(0,pos1)
var strMonth=elementValue.substring(pos1+1,pos2)
var strYear=elementValue.substring(pos2+1)
strYr=strYear
if (strDay.charAt(0)=="0" && strDay.length>1)
strDay=strDay.substring(1)
if (strMonth.charAt(0)=="0" && strMonth.length>1)
strMonth=strMonth.substring(1)
for (var i = 1; i <= 3; i++) {
if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
}
month=parseInt(strMonth)
day=parseInt(strDay)
year=parseInt(strYr)
if(elementValue!="") {
if (pos1==-1 || pos2==-1){
return errorMessage("The date format should be : dd/mm/yyyy", element);
}
if (strMonth.length<1 || month<1 || month>12){
return errorMessage("Please enter a valid month", element);
}
if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
return errorMessage("Please enter a valid day", element);
}
if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
return errorMessage("Please enter a valid 4 digit year between "+minYear+" and "+maxYear, element);
}
if (elementValue.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(elementValue, dtCh))==false){
return errorMessage("Please enter a valid date", element);
}
}
return true;
}
function formatDate(textBoxObj) {
var elementValue = textBoxObj.value;
for (i=0; i<elementValue.length; i++){
if(((i==2)||(i==5))){}
else {
var c = elementValue.charAt(i);
if (((c < "0") || (c > "9"))){
alert("Only Numbers Are Allowed");
textBoxObj.value='';
return false;
}
}
}
if((elementValue.length==2)||(elementValue.length==5)){
textBoxObj.value=elementValue+'/';
}
return true;
}
function isValidDate(element){
var elementValue = element.value;
var daysInMonth = DaysArray(12);
var pos1=elementValue.indexOf(dtCh)
var pos2=elementValue.indexOf(dtCh,pos1+1)
var strDay=elementValue.substring(0,pos1)
var strMonth=elementValue.substring(pos1+1,pos2)
var strYear=elementValue.substring(pos2+1)
strYr=strYear
if (strDay.charAt(0)=="0" && strDay.length>1)
strDay=strDay.substring(1)
if (strMonth.charAt(0)=="0" && strMonth.length>1)
strMonth=strMonth.substring(1)
for (var i = 1; i <= 3; i++) {
if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
}
month=parseInt(strMonth)
day=parseInt(strDay)
year=parseInt(strYr)
if(elementValue!="") {
if (pos1==-1 || pos2==-1){
return errorMessage("The date format should be : dd/mm/yyyy", element);
}
if (strMonth.length<1 || month<1 || month>12){
return errorMessage("Please enter a valid month", element);
}
if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
return errorMessage("Please enter a valid day", element);
}
if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
return errorMessage("Please enter a valid 4 digit year between "+minYear+" and "+maxYear, element);
}
if (elementValue.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(elementValue, dtCh))==false){
return errorMessage("Please enter a valid date", element);
}
}
return true;
}
function DaysArray(n) {
for (var i = 1; i <= n; i++) {
this[i] = 31
if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
if (i==2) {this[i] = 29}
}
return this
}
<!-- Begin Script for progressbar
var progressEnd = 15; // set to number of progress <span>'s.
var progressColor = 'blue'; // set to progress bar color
var progressInterval = 1000; // set to time between updates (milli-seconds)
var progressAt = progressEnd;
var progressTimer;
function progress_clear() {
for (var i = 1; i <= progressEnd; i++) document.getElementById('progress'+i).style.backgroundColor = 'transparent';
progressAt = 0;
}
function progress_update() {
document.getElementById("statusmessage").style.display ="";
progressAt++;
if (progressAt > progressEnd) progress_clear();
else document.getElementById('progress'+progressAt).style.backgroundColor = progressColor;
progressTimer = setTimeout('progress_update()',progressInterval);
}
function progress_stop() {
document.getElementById("statusmessage").style.display ="none";
clearTimeout(progressTimer);
progress_clear();
}
// End for progressbar-->
function submitform(){
var oForm = document.getElementById('accesscarddata');
var startdate = document.getElementById("startdate").value;
var enddate = document.getElementById("enddate").value;
if(startdate == ""){
alert("Please select Start Date.");
return false;
}
if(enddate == ""){
alert("Please select End Date.");
return false;
}
if(Validate(oForm)){
progress_update();
document.forms["accesscarddata"].submit();
}
}
</script>
</head>
<body topmargin="0" leftmargin="0" rightmargin="0" bottommargin="0"
marginheight="0" marginwidth="0" bgcolor="#FFFFFF">
<form name="accesscarddata" id="accesscarddata"
action="LeaveReportServlet" method="post"
enctype="multipart/form-data">
<table border="0" width="100%" cellspacing="0" cellpadding="0"
background="images/topbkg.gif">
<tr>
<td width="50%" valign="top"><img border="0"
src="images/logo.gif" width="145" height="66"></td>
<td width="50%" valign="top">
<p align="right">
<img border="0" src="images/topright.gif" width="315" height="66">
</td>
</tr>
</table>
<table border="0" width="100%" cellspacing="0" cellpadding="0"
background="img/blackline.gif">
<tr>
<td width="100%">
<p align="left">
<font color="#F0D8B8" face="Arial" size="2"><b>
slingemp | slingemp
| slingemp |
slingemp | slingemp
| slingemp | slingemp</b></font>
</td>
</tr>
</table>
<p align="center" style="margin-left: 20">
<font face="Arial" color="#000000" size="4">Attendance Process</font>
</p>
<div id="statusmessage" style="display:none">
<table align="center" >
<tr>
<td>
<div style="font-size:8pt;padding:2px;border:solid black 1px">
<span id="progress1"> </span>
<span id="progress2"> </span>
<span id="progress3"> </span>
<span id="progress4"> </span>
<span id="progress5"> </span>
<span id="progress6"> </span>
<span id="progress7"> </span>
<span id="progress8"> </span>
<span id="progress9"> </span>
<span id="progress10"> </span>
<span id="progress11"> </span>
<span id="progress12"> </span>
<span id="progress13"> </span>
<span id="progress14"> </span>
<span id="progress15"> </span>
</div>
</td>
</tr>
</table>
</div>
<p align="left" style="margin-left: 20">
<font face="Arial" size="2" color="#000000"> </font>
</p>
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td width="25%" align="left"> </td>
<td width="1%" align="left"> </td>
<td width="64%" align="left">
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr class="darkrow">
<td width="2%" align="left">*</td>
<td width="20%" align="left">Start Date</td>
<td width="58%" align="left"><input type="text"
name="startdate" id="startdate" maxlength="10"
onkeyup="formatDate(this)" onblur="isValidDate(this)" /> <img
src="images/calpicker.png" name="image" id="startdate"
onclick="scwShow(document.forms[0].startdate,event,'');return false;">
</td>
<td width="20%" align="left"> </td>
</tr>
<tr class="lightrow">
<td width="2%" align="left">*</td>
<td width="20%" align="left">End Date</td>
<td width="58%" align="left"><input type="text"
name="enddate" id="enddate" maxlength="10"
onkeyup="formatDate(this)" onblur="isValidDate(this)" /> <img
src="images/calpicker.png" name="image" id="startdate"
onclick="scwShow(document.forms[0].enddate,event,'');return false;">
</td>
<td width="20%" align="left"> </td>
</tr>
<tr class="darkrow">
<td width="2%" align="left">*</td>
<td width="20%" align="left">Select file</td>
<td width="58%" align="left"><input type="file"
name="myFile" id="myFile" /></td>
<td width="20%" align="left"> </td>
</tr>
<tr class="lightrow">
<td width="2%" align="left"> </td>
<td width="20%" align="left"> </td>
<td width="58%" align="left"><input type="button"
value="Process" onclick="submitform()" /></td>
<td width="20%" align="left"> </td>
</tr>
<%
if(reportMap.size()>0){ %>
<script>
progress_stop();
</script>
<tr class="lightrow">
<td width="2%" class="title_sub" align="center">S.No</td>
<td width="20%" class="title_sub" align="center">EmployeeID</td>
<td width="58%" class="title_sub" align="left">EmployeeName</td>
<td width="20%" class="title_sub" align="left">Action</td>
</tr>
<%
Iterator<Map.Entry<String, String>> entries = reportMap.entrySet().iterator();
while (entries.hasNext()) {
Map.Entry<String, String> entry = entries.next();
if (style % 2 == 0) {
classname = "darkrow";
} else {
classname = "lightrow";
}
employeeid = entry.getKey();
employeename = entry.getValue();
%>
<tr class='<%=classname %>'>
<td width="2%" align="center"><%=sno %></td>
<td width="20%" align="center"><%=employeeid %></td>
<td width="58%" align="left"><%=employeename %></td>
<td width="20%" align="left"><a href="#" alt='<%=employeeid%>' title='<%=employeeid%>'>sendmail</a></td>
</tr>
<%
sno++;
style++;
}
}
%>
</table>
</td>
<td width="10%" align="right"> </td>
</tr>
</table>
<p align="left" style="margin-left: 20">
<font face="Arial" size="2" color="#000000"> </font>
</p>
<p align="left" style="margin-left: 20">
<font face="Arial" color="#000000" size="4"> </font>
</p>
<p align="left" style="margin-left: 20">
<font face="Arial" size="2" color="#000000"> </font>
</p>
<p align="left" style="margin-left: 20">
<font face="Arial" size="2" color="#000000"> </font>
</p>
<p align="left" style="margin-left: 20">
<font face="Arial" size="2" color="#000000"> </font>
</p>
<p align="center" style="margin-left: 20">
<font face="Arial" color="#000000" size="1">© COPYRIGHT 2012
ALL RIGHTS RESERVED SLINGMEDIA.COM</font>
</p>
<table border="0" width="100%" cellspacing="0" cellpadding="0"
background="images/botbkg.gif">
<tr>
<td width="100%"><img border="0" src="images/botbkg.gif"
width="48" height="12"></td>
</tr>
</table>
<div
style="text-align: center; font-family: Arial, Helvetica, Sans-Serif; font-size: 11px; color: #777;">
<a style="text-decoration: none; color: #777;"
href="#">Tutorials</a> | <a
style="text-decoration: none; color: #777;"
href="#">Codes</a> | <a
style="text-decoration: none; color: #777;"
href="#">Templates</a>
</div>
</form>
</body>
</html>
Use HttpSession.removeAttribute(String name).