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File/Web IO and HTML Writing Example
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| public class BadTickerException extends IllegalArgumentException { | |
| private static final long serialVersionUID = 1L; | |
| public BadTickerException() { | |
| super(); | |
| } | |
| public BadTickerException(String s) { | |
| super(s); | |
| } | |
| } |
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| public class FileIO { | |
| public static void main(String[] args) { | |
| // open file, handle exceptions | |
| File csv = new File("data/quotes.csv"); | |
| Scanner reader = null; | |
| try { | |
| reader = new Scanner(csv); | |
| } catch (FileNotFoundException e) { | |
| System.out.println("Sorry, the file " + csv.toString() +" doesn't exist. Exiting...."); | |
| System.exit(1); | |
| } | |
| // don't process header -- yahoo doesn't give us one | |
| // process line, print out the ticker and price | |
| while(reader.hasNext()) { | |
| String s = reader.nextLine(); | |
| String[] items = s.split(","); | |
| //String ticker = items[0].substring(1,items[0].length()-1); | |
| String ticker = items[0].replaceAll("\"", ""); | |
| // if (items[1].equals("N/A")) { | |
| // // create a new exception | |
| // BadTickerException myException = new BadTickerException("Invalid Symbol"); | |
| // //throw it | |
| // throw myException; | |
| // } | |
| System.out.println(ticker + ' ' + items[1]); | |
| } | |
| // close file | |
| reader.close(); | |
| } | |
| } |
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| FB | 92.77 | 9/25/2015 | 4:00pm | -1.64 | 95.85 | 95.85 | 92.06 | 28961622 | |
|---|---|---|---|---|---|---|---|---|---|
| FTR | 5.00 | 9/25/2015 | 4:00pm | +0.17 | 4.85 | 5.11 | 4.85 | 28553188 | |
| MU | 14.91 | 9/25/2015 | 4:00pm | -0.43 | 15.50 | 15.59 | 14.65 | 28917267 | |
| MSFT | 43.94 | 9/25/2015 | 4:00pm | +0.03 | 44.59 | 44.73 | 43.76 | 29384601 | |
| ORCL | 36.05 | 9/25/2015 | 4:01pm | -0.01 | 36.20 | 36.32 | 35.91 | 19386998 | |
| CSCO | 26.025 | 9/25/2015 | 4:00pm | +0.615 | 25.850 | 26.295 | 25.800 | 37618273 | |
| AAL | 40.24 | 9/25/2015 | 4:00pm | -0.01 | 40.89 | 41.03 | 39.92 | 7524947 | |
| AAL | 40.24 | 9/25/2015 | 4:00pm | -0.01 | 40.89 | 41.03 | 39.92 | 7524947 | |
| SONC | 24.53 | 9/25/2015 | 4:00pm | -0.03 | 24.81 | 25.05 | 24.44 | 992608 | |
| NVDA | 23.61 | 9/25/2015 | 4:00pm | +0.17 | 23.73 | 24.07 | 23.38 | 9242268 | |
| SPSL | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | |
| AAPL | 114.71 | 9/25/2015 | 4:00pm | -0.29 | 116.36 | 116.69 | 114.02 | 56151926 | |
| IBM | 145.42 | 9/25/2015 | 4:01pm | +1.01 | 145.55 | 146.27 | 144.53 | 3474429 |
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| public class WebIO { | |
| public static void main(String[] args) { | |
| String yahoo = "http://download.finance.yahoo.com/d/quotes.csv?" + | |
| "s=FB,FTR,MU,MSFT,ORCL,CSCO,AAL,AAL,SONC,NVDA,AAPL,IBM&" + | |
| "f=sl1d1t1c1ohgv&e=.csv"; | |
| // open web resource, process exceptions | |
| Scanner reader = null; | |
| try { | |
| URL url = new URL(yahoo); | |
| reader = new Scanner(url.openStream()); | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| System.exit(1); | |
| } | |
| // don't process header -- yahoo doesn't give us one | |
| // process line, print out the ticker and price | |
| while(reader.hasNext()) { | |
| String s = reader.nextLine(); | |
| String[] items = s.split(","); | |
| //String ticker = items[0].substring(1,items[0].length()-1); | |
| String ticker = items[0].replaceAll("\"", ""); | |
| if (items[1].equals("N/A")) { | |
| // create a new exception | |
| BadTickerException myException = new BadTickerException("Invalid Symbol"); | |
| //throw it | |
| throw myException; | |
| } | |
| System.out.println(ticker + ' ' + items[1]); | |
| } | |
| // close file | |
| reader.close(); | |
| } | |
| } |
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| public class WritingExperiment { | |
| public static void main(String[] args) throws FileNotFoundException { | |
| // create a new file for writing | |
| File html = new File("ascii.html"); | |
| PrintWriter writer = new PrintWriter(html); | |
| // write html | |
| //// Write the top html | |
| System.out.println("starting ..."); | |
| writer.println("<html>"); | |
| writer.println("<h1>Consolidated ASCII Table</h1>"); | |
| writer.println("<table border=\"3\" cellpadding=\"3\" cellspacing='3'>"); | |
| writer.println("<thead>"); | |
| writer.println("<tr><th>"); | |
| writer.println("<p><strong>Decimal</strong></p>"); | |
| writer.println("</th><th>"); | |
| writer.println("<p><strong>Character</strong></p>"); | |
| writer.println("</th>"); | |
| writer.println("</tr>"); | |
| writer.println("</thead>"); | |
| writer.println("<tbody>"); | |
| //// Write iterative table part | |
| for (int i = 65; i <= 90; i++ ) { | |
| writer.println("<tr><td>"); | |
| writer.println("<p>" + i + "</p>"); | |
| writer.println("</td><td align=\"right\">"); | |
| writer.println("<p>"+ (char)i + "</p>"); | |
| writer.println("</td>"); | |
| writer.println("</tr>"); | |
| } | |
| //// Write the end stuff in html | |
| writer.println("</tbody>"); | |
| writer.println("</table>"); | |
| writer.println("</html>"); | |
| // close file that we were writing | |
| writer.close(); | |
| System.out.println("done ..."); | |
| } | |
| } |
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