javascript 宝典第七版光盘内容

/* Simple clock applet demonstrating access from JavaScript by Danny Goodman (http://www.dannyg.com) */ import java.awt.*; import java.util.*; import java.text.*; public class ScriptableClock extends java.applet.Applet implements Runnable { // control variables private final boolean GMT = true; private final boolean LOCALE = false; private String displayDate; private Font displayFont; private Thread thread; // parameter options private Color bgColor; private Color fgColor; private Rectangle displayArea; private String fontName; private int fontSize; private int fontStyle; private int height, width; private boolean timeZone; @Override public void init() { parseArgs(); displayFont = new Font(fontName, fontStyle, fontSize); timeZone = LOCALE; displayArea = getBounds(); height = displayArea.height; width = displayArea.width; resize(width, height); } @Override public void start() { if (thread == null) { thread = new Thread(this); thread.start(); } } @Override public void stop() { if (thread != null) { thread = null; } } public void run() { while (thread != null) { Date theDate = new Date(); DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.MEDIUM. DateFormat.FULL); if (timeZone) { dateFormat.setTimeZone(TimeZone.getTimeZone("GMT-0:00")); } displayDate = dateFormat.format(theDate); repaint(); try { Thread.sleep(1000); } catch (InterruptedException e) { } } } @Override public void paint(Graphics g) { g.setColor(bgColor); g.fillRect(0, 0, width, height); g.setColor(fgColor); g.setFont(displayFont); FontMetrics fm = getFontMetrics(getFont()); int textWidth = fm.stringWidth(displayDate); int horizOffset = (width / 2) - (textWidth / 2); g.drawString(displayDate, 5, 35); } /* Begin public methods for getting and setting data via LiveConnect */ public void setTimeZone(String zone) { stop(); timeZone = (zone.startsWith("GMT")) ? true : false; start(); } public void setFont(String newFont, String newStyle, String newSize) { stop(); if (newFont != null && newFont.length() != 0) { fontName = newFont; } if (newStyle != null && newStyle.length() != 0) { setFontStyle(newStyle); } if (newSize != null && newSize.length() != 0) { setFontSize(newSize); } displayFont = new Font(fontName, fontStyle, fontSize); start(); } public void setColor(String newbgColor, String newfgColor) { stop(); bgColor = parseColor(newbgColor); fgColor = parseColor(newfgColor); start(); } public String getInfo() { String result = "Info about ScriptableClock.class\r\n"; result += "Version/Date: 1.0d1/2 May 1996\r\n"; result += "Author: Danny Goodman (dannyg@dannyg.com)\r\n"; result += "Public Variables:\r\n"; result += " (None)\r\n\r\n"; result += "Public Methods:\r\n"; result += " setTimeZone(\"GMT\" | \"Locale\")\r\n"; result += " setFont(\"fontName\",\"Plain\" |\"Bold\" | \"Italic\", \"fontSize\")\r\n"; result += " setColor(\"bgColorName\", \"fgColorName\")\r\n"; result += " colors: Black, White, Red, Green, Blue, Yellow\r\n"; return result; } /* End public methods for scripted access. */ private void setFontStyle(String style) { try { if (style.equalsIgnoreCase("Plain")) { fontStyle = Font.PLAIN; } else if (style.equalsIgnoreCase("Italic")) { fontStyle = Font.ITALIC; } else { fontStyle = Font.BOLD; } } catch (Exception e) { fontStyle = Font.BOLD; } } private void setFontSize(String size) { try { fontSize = Integer.parseInt(size); } catch (Exception e) { fontSize = 24; } } private void parseArgs() { fontName = getParameter("font"); if (fontName == null) { fontName = new String("TimesRoman"); } String n = getParameter("fontSize"); setFontSize(n); n = getParameter("fontStyle"); setFontStyle(n); bgColor = parseColor(getParameter("bgColor")); if (bgColor == null) { bgColor = Color.white; } fgColor = parseColor(getParameter("fgColor")); if (fgColor == null) { fgColor = Color.black; } } private Color parseColor(String c) { try { if (c.equalsIgnoreCase("Black")) { return Color.black; } else if (c.equalsIgnoreCase("White")) { return Color.white; } else if (c.equalsIgnoreCase("Red")) { return Color.red; } else if (c.equalsIgnoreCase("Green")) { return Color.green; } else if (c.equalsIgnoreCase("Blue")) { return Color.blue; } else if (c.equalsIgnoreCase("Yellow")) { return Color.yellow; } else { return Color.black; } } catch (Exception e) { return null; } } }