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applet是否可以操作cookie?
来源: 互联网 发布时间:2015-01-12
本文导语: 这样实现? | Access Cookies from a Java Applet 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 Co...
这样实现?
|
Access Cookies from a Java Applet
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 filesnetscapecommunicatorprogramjavaclassesjava40.jar";%classpath% TestCookie.java
[HTML file (testCookie.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) {
/*
** write a cookie
** 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().toString();
String s1 = tf1.getText() + expires;
System.out.println(s1);
JSObject myBrowser = JSObject.getWindow(this);
JSObject myDocument = (JSObject) myBrowser.getMember("document");
myDocument.setMember("cookie", s1);
}
if (ae.getSource() == b2) {
/*
** read a cookie
*/
tf2.setText(getCookie());
}
if (ae.getSource() == b3) {
/*
** 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().toString();
String s1 = tf1.getText() + expires;
JSObject myBrowser = JSObject.getWindow(this);
JSObject myDocument = (JSObject) myBrowser.getMember("document");
myDocument.setMember("cookie", s1);
}
}
public String getCookie() {
/*
** get all cookies for a document
*/
try {
JSObject myBrowser = (JSObject) JSObject.getWindow(this);
JSObject myDocument = (JSObject) myBrowser.getMember("document");
String myCookie = (String)myDocument.getMember("cookie");
if (myCookie.length() > 0)
return myCookie;
}
catch (Exception e){
e.printStackTrace();
}
return "?";
}
public String getCookie(String name) {
/*
** get a specific cookie by its name, parse the cookie.
** not used in this Applet but can be useful
*/
String myCookie = getCookie();
String search = name + "=";
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 "";
}
}
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 filesnetscapecommunicatorprogramjavaclassesjava40.jar";%classpath% TestCookie.java
[HTML file (testCookie.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) {
/*
** write a cookie
** 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().toString();
String s1 = tf1.getText() + expires;
System.out.println(s1);
JSObject myBrowser = JSObject.getWindow(this);
JSObject myDocument = (JSObject) myBrowser.getMember("document");
myDocument.setMember("cookie", s1);
}
if (ae.getSource() == b2) {
/*
** read a cookie
*/
tf2.setText(getCookie());
}
if (ae.getSource() == b3) {
/*
** 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().toString();
String s1 = tf1.getText() + expires;
JSObject myBrowser = JSObject.getWindow(this);
JSObject myDocument = (JSObject) myBrowser.getMember("document");
myDocument.setMember("cookie", s1);
}
}
public String getCookie() {
/*
** get all cookies for a document
*/
try {
JSObject myBrowser = (JSObject) JSObject.getWindow(this);
JSObject myDocument = (JSObject) myBrowser.getMember("document");
String myCookie = (String)myDocument.getMember("cookie");
if (myCookie.length() > 0)
return myCookie;
}
catch (Exception e){
e.printStackTrace();
}
return "?";
}
public String getCookie(String name) {
/*
** get a specific cookie by its name, parse the cookie.
** not used in this Applet but can be useful
*/
String myCookie = getCookie();
String search = name + "=";
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 "";
}
}