Java and javascript cookies

Hi
i create a cookie called "SaveState" from javascript in my JSP dynpage.
I want to read this from java (NOT JAVASCRIPT).
Is this possible?
if not, is there some kind of portal memory I can use to pass values between java and javascript?
thanks
Anton Kruse

Hi,
<b>Domain</b>
The "domain" parameter is used to set the domain the cookie is accessable to. A path can be set for your own domain only and the domain path must include at least two periods (.domain.com). It must match your server's domain name. Therefore cookies are not a security risk since only the server that sets them can use them.
Check this to know more about cookies:
http://www.comptechdoc.org/independent/web/cgi/javamanual/javacookie.html
If you still have questions, I will suggest to google on cookies.
Greetings,
Praveen Gudapati

Similar Messages

Error using java and javascript

I have a jsp page that links to a bean and is working fine (getting data from the database).
On a html form I have a button with a picture that fires off javascript when clicked:
<BUTTON TYPE=reset onclick=showinfo('<%=index%>')>
<IMG SRC="http://localhost:8080/Portal/Images/q2.bmp" ALT="Info">
</BUTTON>
The javascript function just opens a new window and displays the text sent in:
<Script Language=JavaScript>
function showinfo(arrayindex)
InfoWin=window.open("","InfoWin","width=345,height=220");
InfoWin.document.write(arrayindex);
return false;
</Script>
Well in the above example index is a number (pulled from the database using a java bean and javascript converts it into a string then the function displays it correctly. If I replace <%=index%> with regular text it works fine as well(because java isn't used to pull data)! The problem occurs when I retrieve text data from the database and send it to the function. The web page gives errors about a nonterminating string. But I can move the code to somewhere else on the form(as long as I don't send it to java script) and it will print the text to the screen. I can also view the source of the web page and the html shows the text from the data base as if I hard coded the text into the javascript!!!!!!!!!!!!!!!!!
This must be a bug between java and javascript!
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Found the problem myself!
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What's the difference between java and Javascript?

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Java is a programming language, Javascript is more for web pages. It is used to add interactivity to your web pages. 2 different languages.
check out www.java.sun.com for Sun Java stuff.
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Java and Javascript

I am in the process of a doing my final year project. I have to make an Interactive Guide. I am going to use SQL for the database and then use Java to interact with the database. I would like advice on and if people know of any good sources on where I can find good information on how to get Java to interact with Javascript. I have looked at other interactive guide websites and found that they use Javascript but upon viewing the source code I am unable to work out how they get them to interact.
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Thank you.
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msc85tjm wrote:
I am in the process of a doing my final year project. I have to make an Interactive Guide. I am going to use SQL for the database and then use Java to interact with the database. I would like advice on and if people know of any good sources on where I can find good information on how to get Java to interact with Javascript. I have looked at other interactive guide websites and found that they use Javascript but upon viewing the source code I am unable to work out how they get them to interact.
Secondly I was wondering if I could be pointed to a good source of information or if people can pass on advice on how to create a good login system.
Thank you.
TimDefine, "interact with java." Are you talking AJAX? Not too sure what you meant by that.
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Java and Javascript together?

I am a moderately new Java programmer and I was wondering if anyone knew how to use java to connect to the internet then access a Javascript function on that page. Any help would be greatly appreciated.

Unless it's necessary, you could use the validate in the ActionFormBean of using struts instead of the Javascript. You will have to create a methode called validate of the type ActionError. You should look into the Struts example Application, they do a simple Validation on the User name and password. This is how I'm doing the validation using struts.
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good luck

How is the length of a string calculated in Java? and JavaScript?

Hi all,
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Thanks,
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What's Unicode 4 got to do with it? 1 characteris 1
character is 1 character.
strings now contain (and Java chars also) is
UTF-16 code units rather than Unicode characters
or
code points. Unicode characters outside the BMPare
encoded in Java as two or more code units. So it would seem that in some cases, a single
"character" on the screen, will require two charsto
represent it.So... you're saying that String.length() doesn't
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I assume it would return the number of chars in the array, rather than the number of symbols (glyphs?) this translates into. But I might have it bass ackwards.

Problem of Java - javascript and javascript - java communicate of same obje

Hi all,
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<HTML>
<HEAD>
<TITLE>Alva Final Year Project Demo</TITLE>
</HEAD>
<Script language="javaScript">
function show(html){
layer.innerHTML = html;
function getResponse(response){
alert("response: " + response);
document.client.getJSCommunicate();
</Script>
<BODY>
<DIV id="layer" style="position:absolute">
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<HR>


<OBJECT id="client" classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
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</DIV>
</BODY>
</HTML>
Thanks your kindly help.
Alva

Everthing looks fine to me from here, you should be able to just call the java function direct such as
document.myAppletObj.doMethod();
I think your problem could be that your object is called "client". IE can get funny about names, it didn't like me calling a method delete()!!
Try adding something else to the name such as "my_client", and see if this works any better.
Chris

Java vs Javascript NOT THE SAME THING

Since we're all just users here it might be appropriate to remind people that Java and Javascript are two distinctly different things. With the recent warnings about Java some might be inclined to also disable Javascript in their browsers. There is no need to do that.
Even thought the two frameworks have similar names they are not related.

drcouzelis wrote:
grabbexi wrote:I want to understand Unix/Linux better
Which aspect of Unix / Linux do you want to understand better?
Options include:
Networking
Servers
System administration (user accounts, permissions)
Software development
Package management
Differences between distributions / operating systems
Kernel compiling
The Linux Standard Base (LSB)
Shared libraries
Version control software
Embedded linux
The init process, boot manager, and dual booting
File systems
And other stuff.
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bohoomil wrote:Well, I believe you mean 'using a particular Linux distribution' in the first place.
Yes, you are right - that is what I meant.
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Java and flash wont work

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You should check that you've got Java and Javascript turned on in Safari preferences:
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New to Java and stuck on alert ticker issue

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Java to javascript problems with '

I have a class that pass some strings to a javascript alert(<....>)
In this sting I have some < ' > and when I launch the class I get always an alert with the ASCII code of < ' >.
I used this syntax inside the String
String alertSctring="Let \' go";
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Let &#39 go
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I'm sure the problem has to do with escaping values in strings in Java and Javascript.
Try using double-backslash quote.. like "Let \\' Go"

Using Quicken to manage a bank account, I get an error message from the bank that cookies and javascript must be enabled, but I don't get that message when I connect with Internet Explorer.

Firefox allows me to get the bank home page through Quicken. But when I try to login, the error message appears saying "cookies and javascript" must be enabled. I have Java on my system, but in Firefox under "tools/options/ I don't find any way to "enable" javascript. I have enabled "cookies".
I have no problem logging in at the bank site using Internet Explorer, but to use it, I have to designate it as the "default browser" before connecting through Quicken. I'd rather keep Firefox as the default.
A bank tech representative was unable to find any commands in Firefox that would deal with this problem, although she clearly had manuals for both Internet Explorer and Firefox. So she concluded that I would have to use Explorer for this operation, since it allowed control of security level settings. She said that in Explorer, security level should be set to medium.
Is there some similar control in Firefox?

Firefox uses the same "security level" setting that is set in IE.
Tools > Options > '''Content''' <br />
Is '''Enable Javascript''' check-marked?
http://kb.mozillazine.org/JavaScript_is_not_Java
If that doesn't solve your problem, do you have that problem when running in the Firefox SafeMode? <br />
[http://support.mozilla.com/en-US/kb/Safe+Mode] <br />
''Don't select anything right now, just use "Continue in SafeMode."''
If not, see this: <br />
[http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes]

Remember Login using cookies and javascript

Hello all,
This is an urgent request. Pls reply asap.
I have two jsps one in English and other in french. I need to implement a functionality to remember the username in both these jsps. I have a function written in javascript to check if the "remember me" checkbox is enabled and then remember the user name. But it is not working as expected. It remembers in one jsp and if i go to french jsp all the info is lost.
Can you pls help me? Sample code would help.
I guess the cookie works only for the jsps under certain folder path say en/jsp/.. and fr/jsp/..

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Login Form</title>
</head>
<body>
<form name="login" method="post" action="Home.jsp">
Email : <input type="text" name="email" /><br />
Password : <input type="password" name="password"/><br />
<input type="checkbox" name="rememberChk" value="on" />Remember Me <br/>
<input type="hidden" name="remember" value="0"/>
<input type="button" value="Sumbit" onClick="submitForm()"/>
</form>
</body>
<script>
     <%
     String email="";
     String password="";
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     if (cookies != null){//Check cookies are available
          for (int i = 0; i < cookies.length; i++){
               if (cookies .getName().equals("password")){
                    password=cookies[i].getValue();//Password which is saved on cookie
                    break;
          for (int i = 0; i < cookies.length; i++){
               if (cookies [i].getName().equals ("email")){
                    email=cookies[i].getValue();//Email which is saved on cookie
                    break;
     }%>
     function submitForm()//Submit function with checkbox determined value
          if(document.login.rememberChk.checked)
               document.login.remember.value = 1;
          else
               document.login.remember.value = 0;
          document.login.submit();
     document.login.email.value="<%=email%>";
     document.login.password.value="<%=password%>";
</script>
</html>
login.jsp
<%@ page contentType="text/html; charset=iso-8859-1" language="java"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Home Page</title>
</head>
<body>
<a href="logout.jsp">Logout</a><br />
<%
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     String password;
     String remember;
     email = request.getParameter("email".toString());
     password = request.getParameter("password".toString());
     remember = request.getParameter("remember");
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      *then Save Email and passwod into Cookie
      *and Add Cookies into response/Client Device
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          Cookie emailAdd = new Cookie("email",email);
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%>
<h4>Welcome - <%=email%> </h4>
Your password is : <%=password%> <br />
</body>
</html>
Home.jsp
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<html>
<%
Cookie cookies [] = request.getCookies ();//Get All Cookies from Client Device
if (cookies != null){//Check cookies are available
     for (int i = 0; i < cookies.length; i++){
          if (cookies .getName().equals("password")){
               Cookie cookie = cookies[i];
               cookie.setMaxAge(0);
               response.addCookie(cookie);
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     for (int i = 0; i < cookies.length; i++){
          if (cookies [i].getName().equals ("email")){
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               cookie.setMaxAge(0);
               response.addCookie(cookie);
               break;
response.sendRedirect("login.jsp");
%>
</html>
logout.jsp

Using cookies and JavaScript to create a page to page timer.

I have long wanted to be able to measure the time it takes to get from one page to another. While reading in my JavaScript reference the other day, I came across cookies. I've long known about cookies but have never used them. The thing that looked attractive was that you can access cookies from both JavaScript and CF.
So I put together the procedures to store the "start time" (startTimeP8D) for the transition and activated it on the onUnload event of a 1stpage. After a few rewrites I got it working.   Here is the JavaScript to do that: it consists of two functions: doTimer which is the input section and setCookie, which writes to the cookie. Not the two numbered alert statements.
doTimer - results for "start" from the doTimer function called from page 1 when it unloads. (See doTimer below)
     Please note that the two startTime8D values are the same immediately after they are stored.
On the 2nd page in the sequence, I run the corresponding code to determine the "end time", compute the delta and write it out to the page. It didn't all run on the first try, but it now seems to be running without a crash, which can be misleading.
      second set of outputs from page 2:
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There is one major hitch in the get along which has me stymied: As you can see, when you compare the startTimeP8 in the setCookie – results above and the "startTimeP8" in the doTimer results below the startTimeP8 is not the value that I wrote to the cookie @ unload of page 1. I have checked and checked and do now see anywhere that the startTimeP8D value is being overwritten. Based upon my limited experience with JavaScript cookies, it seems to me that you get an entry for each time you set the cookie. So I would expect to see to startTimeP8D entry for each setCookie event, not a different value.
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I am using SQLServer 2005, CF8, IE8 on W7.
I'm not married to this way of doing this so if anyone has a better/easier way of doing a "page to page timer", I'm up for it. I'd prefer to fix this one since I've been working on it for the past 3 days.
Thanks in advcance for your help.
Len, PHRED SE

Here it is with no JQuery or console logging calls using cookie utility functions found here:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
       "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
     <title>Test JavaScript Page Load Timer</title>
     <script>
          window.onload = function(){
               var previousPageUnload = getCookie('unloadTime');
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                    var d = new Date();
                    var loadTime = d.getTime() - previousPageUnload;
                    alert(loadTime + 'ms');
          window.onunload = function(){
               var d = new Date();
               setCookie('unloadTime',d.getTime());
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               var exdate=new Date();
               exdate.setDate(exdate.getDate()+expiredays);
               document.cookie=c_name+ "=" + escape(value) + ((expiredays==null) ? "" : ";expires="+exdate.toUTCString());
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               if (document.cookie.length>0) {
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                 if (c_start!=-1)
                   c_start=c_start + c_name.length+1;
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                   if (c_end==-1) c_end=document.cookie.length;
                   return unescape(document.cookie.substring(c_start,c_end));
               return null;
     </script>
</head>
<body>
     <h1>Test JavaScript Page Load Timer</h1>
</body>
</html>
Note that overwriting global window events like this is not a good idea, which is why I used JQuery in my earlier example. I strongly suggest you look at JQuery or one of the other JS libraries (YUI, etc.) to help with event handling. I'll leave it at that as this is getting into JavaScript development, not really on topic for a ColdFusion forum.

1.6.0_10 and 11, Memory leak returning variables from Java to JavaScript

Environment: Windows XP SP2, IE7, JScript 5.7, JRE 1.6.0_11-b03 and 1.6.0_10
Memory allocated in Java and returned as a JavaScript variable value is not garbage collected in Java when the JavaScript variable is re-used.
In the following simplified example, a populated HashMap is returned from the applet test1 method to the JavaScript variable hash1.
The JavaScript variable hash1 is re-used on the next iteration so I would expect it should be marked for garbage collection.
In 1.6.0_7 and previous releases, the memory associated with this Java HashMap is freed implicitly.
In 1.6.0_10 and 1.6.0_11 the HashMap memory is never freed.
Is this is what we should expect, a feature of the significant LiveConnect changes that were part of 1.6.0_10?
Do we need to rewrite our code to call new Java methods from JavaScript explicitly freeing the memory, in this example calling the freeMem method?
Has anybody else experienced this problem since 1.6.0_10?
Thanks
Rob
Example code ...
TestRLApplet.java
import java.applet.Applet;
import java.util.HashMap;
public class TestRLApplet extends Applet
private HashMap hash1;
public TestRLApplet()
public void init()
public HashMap test1()
hash1 = new HashMap();
for (int i = 0; i <10; i++) {
hash1.put(Integer.toString(i),Integer.toString(i));
return (hash1);
public void freeMem() {
hash1.clear();
hash1 = null;
TestClient.htm
<HEAD>
<TITLE></TITLE>
<SCRIPT LANGUAGE="javascript">
function window_onload()
var hash1;
testAppplet = document.TestRLApplet;
for (cnt=0; cnt < 1000; cnt++)
hash1= testAppplet.test1();
</SCRIPT>
</HEAD>
<object
classid = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 1 HEIGHT = 1 NAME = "TestRLApplet" >
<PARAM NAME = CODE VALUE = "TestRLApplet.class" >
<PARAM NAME = ARCHIVE VALUE = "../applets/TestRLApplet.jar" >
<PARAM NAME = NAME VALUE = "TestRLApplet" >
<PARAM NAME = MAYSCRIPT VALUE = true >
<param name = "type" value = "application/x-java-applet;version=1.6">
<param name = "scriptable" value = "false">
</object>
<BODY LANGUAGE=javascript onload="return window_onload()" leftMargin=40 id=body >
</BODY>
</HTML>
Java Console
Java Plug-in 1.6.0_10
Using JRE version 1.6.0_10 Java HotSpot(TM) Client VM
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
Memory: 5,056K Free: 2,551K (50%) ... completed.
Memory: 7,996K Free: 3,499K (43%) ... completed.
Memory: 7,996K Free: 1,038K (12%) ... completed.
Memory: 13,180K Free: 3,745K (28%) ... completed.
Memory: 22,844K Free: 5,614K (24%) ... completed.
Memory: 37,984K Free: 15,009K (39%) ... completed.
Memory: 37,984K Free: 13,069K (34%) ... completed.
Memory: 37,984K Free: 6,125K (16%) ... completed.
Memory: 65,088K Free: 25,107K (38%) ... completed.
Memory: 65,088K Free: 21,201K (32%) ... completed.
Memory: 65,088K Free: 13,381K (20%) ... completed.
Memory: 65,088K Free: 7,967K (12%) ... completed.
Memory: 65,088K Free: 5,013K (7%) ... completed.
Memory: 65,088K Free: 414K (0%) ... completed.

What are you missing?
I inherited this app and signing the third party jars is how it was setup, I was wondering the same thing too, why was it necessary to sign the third party jars?
The applet runs in either JRE 1.6.0_13 or JRE 1.6.0_27 depending on the other Java apps the user uses. JRE 1.6.0_13 does not have the mixed code security (so it is like is disable), but JRE 1.6.0_27 does have the mixed code security and the applet will not launch with mixed code security enable, so we have to disable it. With all the hacking going on in the last two years, is important to improve security; so this is a must.
Yes, I always clear up the cache.
Any idea on how to resolve this problem?

Java and javascript cookies

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