Author: Real Gagnon
Author's WebSite: http://tactika.com/realhome/realhome.html
This Applet uses the package netscape.javascript.JSObject. To compile such program, you have to include in the CLASSPATH the file java40.jar if you have the Netscape Communicator v4 installed or classes.zip for the Microsoft Internet Explorer. Compile with something like
javac -classpath
.;"\program files\netscape\communicator\program\java\classes\java40.jar";%classpath%
TestCookie.java
[HTML file (testCookie.html)]
<HTML><HEAD></HEAD><BODY>
<APPLET CODE=TestCookie.class
MAYSCRIPT
HEIGHT=150
WIDTH=200>
</APPLET></BODY></HTML>
[Java applet (TestCookie.java)]
import netscape.javascript.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class TestCookie extends Applet
implements ActionListener {
TextField tf1, tf2;
Button b1, b2, b3;
public void init() {
tf1 = new TextField(20);
tf2 = new TextField(20);
b1 = new Button("Write Cookie");
b2 = new Button("Read Cookie");
b3 = new Button("Delete Coookie");
setLayout(new FlowLayout());
add(tf1);
add(tf2);
add(b1);
add(b2);
add(b3);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
}
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == b1) {
/*
** computes the expiration date, good for 1 month
*/
java.util.Calendar c = java.util.Calendar.getInstance();
c.roll(java.util.Calendar.MONTH, true);
c.add(java.util.Calendar.MONTH, 1);
String expires = "; expires=" + c.getTime().toGMTString();
String s1 = tf1.getText() + expires;
JSObject win = JSObject.getWindow(this);
win.eval("document.cookie=\"" + s1 + "\"");
}
if (ae.getSource() == b2) {
JSObject win = JSObject.getWindow(this);
String s =(String)win.eval("document.cookie");
tf2.setText(s);
/*
IE4 _may_ have some problem with the eval method, the String is not
always returned (reported by Ivan Woehr). The workaround is to use
the getMember method to retrieve the cookie. Here a method to do the
job nicely:
String getCookie(String name) {
JSObject myBrowser = (JSObject) JSObject.getWindow(this);
JSObject myDocument = (JSObject) myBrowser.getMember("document");
String search = name+"==";
String myCookie = (String)myDocument.getMember("cookie");
if (myCookie.length() > 0) {
int offset = myCookie.indexOf(search);
if (offset != -1) {
offset += search.length();
int end = myCookie.indexOf(";", offset);
if (end == -1) end = myCookie.length();
return myCookie.substring(offset,end);
}
else
System.out.println("Did not find cookie: "+name);
return "";
*/
}
if (ae.getSource() == b3) {
/*
** to delete a cookie, set the expiration in the past
*/
java.util.Calendar c = java.util.Calendar.getInstance();
c.roll(java.util.Calendar.MONTH, true);
c.add(java.util.Calendar.MONTH, -1);
String expires = "; expires=" + c.getTime().toGMTString();
String s1 = tf1.getText() + expires;
JSObject win = JSObject.getWindow(this);
win.eval("document.cookie=\"" + s1 + "\"");
}
}
}
Posted On: 7-Jul-1999
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