| javac testcookie.java |
注：包netscape.javascript.* package现在已经包含在%JRE_HOME%\lib\jaws.jar 文件中。
[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) { /* ** write a cookie ** computes the expiration date, good for 1 month */ java.util.Calendar c = java.util.Calendar.getInstance(); 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.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 ""; } } |
