用J2ME进行联网 - 编程入门网
作者 佚名技术
来源 NET编程
浏览
发布时间 2012-06-17
| ay; Form displayForm; public CurrencyExchange() { display = Display.getDisplay(this); exitCommand = new Command("Exit", Command.SCREEN, 1); } // Start the MIDlet by creating the Form and // associating the exit command and listener. public void startApp() { displayForm = new Form("Exchange Rate"); displayForm.addCommand(exitCommand); displayForm.setCommandListener(this); try { String result = getViaHttpConnection ("http://finance.yahoo.com/m5?a=1&s=USD&t=GBP"); displayForm.append(" " + result); } catch (Exception exc) { exc.printStackTrace(); } display.setCurrent(displayForm); } // Pause is a no-op because there is no background // activities or record stores to be closed. public void pauseApp() { } // Destroy must cleanup everything not handled // by the garbage collector. // In this case there is nothing to cleanup. public void destroyApp(boolean unconditional) { } // Respond to commands. Here we are only implementing // the exit command. In the exit command, cleanup and // notify that the MIDlet has been destroyed. public void commandAction( Command c, Displayable s) { if (c == exitCommand) { destroyApp(false); notifyDestroyed(); } } String parse(String str) { // Get the time of Currency Exchange and Related information int timeIndex = str.indexOf("U.S. Markets Closed."); String retTime = ""; if (timeIndex != -1) { retTime = str.substring(timeIndex-34, timeIndex); retTime += " U.S. Markets Closed "; } String retVal = ""; int dec = 0; int index = str.indexOf("USDGBP"); if (index != -1) str = str.substring(index, str.length()); if ( (( dec = str.indexOf(".")) != -1) && (!(str.endsWith("."))) && Character.isDigit(str.charAt(dec+1)) ) { String front = ""; int find = dec-1; while (Character.isDigit(str.charAt(find))) { front += str.charAt(find); find--; } retVal += new StringBuffer(front).reverse().toString(); retVal += "."; String back = ""; int bind = dec+4; while (Character.isDigit(str.charAt(bind))) { back += str.charAt(bind); bind--; } retVal += new StringBuffer(back).reverse().toString(); } System.out.println(retVal); return "USD/GBP " + retVal + " at " + retTime ; } String getViaHttpConnection(String url) throws IOException { HttpConnection c = null; InputStream is = null; StringBuffer str = new StringBuffer(); try { c = (HttpConnection)Connector.open(url); // Get the ContentType String type = c.getType(); // Getting the InputStream will open the connection // and read the HTTP headers. They are stored until // requested. |
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