JAVA SCRIPT 优秀教程

/* Simple clock applet demonstrating access from JavaScript by Danny Goodman (http://www.dannyg.com) (To modify and recompile, rename file to 'ScriptableClock.java') */ import java.awt.*; import java.util.Date; public class ScriptableClock extends java.applet.Applet implements Runnable { // control variables final boolean GMT = true; final boolean LOCALE = false; String displayDate; Font displayFont; Thread thread; // parameter options Color bgColor; Color fgColor; Rectangle displayArea; String fontName; int fontSize; int fontStyle; int height, width; boolean timeZone; public void init() { parseArgs(); displayFont = new Font(fontName, fontStyle, fontSize); timeZone = LOCALE; displayArea = bounds(); height = displayArea.height; width = displayArea.width; resize(width,height); } public void start() { if(thread == null) { thread = new Thread(this); thread.start(); } } public void stop() { if(thread != null) { thread.stop(); thread = null; } } public void run() { while(thread != null) { Date theDate = new Date(); displayDate = (timeZone) ? theDate.toGMTString() : theDate.toLocaleString(); repaint(); try { Thread.sleep(1000); } catch(InterruptedException e) {} } } 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 != "") fontName = newFont; if (newStyle != null && newStyle != "") setFontStyle(newStyle); if (newSize != null && newSize != "") 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; } } }