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File and Web IO Examples
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<!-- example of very simple html file --> | |
<html> | |
<h1>Consolidated ASCII Table</h1> | |
<table border="3" cellpadding="3" cellspacing='3'> | |
<thead> | |
<tr><th> | |
<p><strong>Decimal</strong></p> | |
</th><th> | |
<p><strong>Character</strong></p> | |
</th> | |
</tr> | |
</thead> | |
<tbody> | |
<tr><td> | |
<p>65</p> | |
</td><td align="right"> | |
<p>A</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>66</p> | |
</td><td align="right"> | |
<p>B</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>67</p> | |
</td><td align="right"> | |
<p>C</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>68</p> | |
</td><td align="right"> | |
<p>D</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>69</p> | |
</td><td align="right"> | |
<p>E</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>70</p> | |
</td><td align="right"> | |
<p>F</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>71</p> | |
</td><td align="right"> | |
<p>G</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>72</p> | |
</td><td align="right"> | |
<p>H</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>73</p> | |
</td><td align="right"> | |
<p>I</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>74</p> | |
</td><td align="right"> | |
<p>J</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>75</p> | |
</td><td align="right"> | |
<p>K</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>76</p> | |
</td><td align="right"> | |
<p>L</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>77</p> | |
</td><td align="right"> | |
<p>M</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>78</p> | |
</td><td align="right"> | |
<p>N</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>79</p> | |
</td><td align="right"> | |
<p>O</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>80</p> | |
</td><td align="right"> | |
<p>P</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>81</p> | |
</td><td align="right"> | |
<p>Q</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>82</p> | |
</td><td align="right"> | |
<p>R</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>83</p> | |
</td><td align="right"> | |
<p>S</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>84</p> | |
</td><td align="right"> | |
<p>T</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>85</p> | |
</td><td align="right"> | |
<p>U</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>86</p> | |
</td><td align="right"> | |
<p>V</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>87</p> | |
</td><td align="right"> | |
<p>W</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>88</p> | |
</td><td align="right"> | |
<p>X</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>89</p> | |
</td><td align="right"> | |
<p>Y</p> | |
</td> | |
</tr> | |
<tr><td> | |
<p>90</p> | |
</td><td align="right"> | |
<p>Z</p> | |
</td> | |
</tr> | |
</tbody> | |
</table> | |
</html> |
We can make this file beautiful and searchable if this error is corrected: It looks like row 2 should actually have 1 column, instead of 7. in line 1.
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# excerpt from longer file | |
"c_image", "l_image", "r_image", "steering", "throttle", "brake", "speed" | |
center_2017_09_10_19_06_00_906.jpg,left_2017_09_10_19_06_00_906.jpg,right_2017_09_10_19_06_00_906.jpg,0,0.4,0,2.351806 | |
center_2017_09_10_19_06_00_980.jpg,left_2017_09_10_19_06_00_980.jpg,right_2017_09_10_19_06_00_980.jpg,0,0.4,0,2.713444 | |
center_2017_09_10_19_06_01_051.jpg,left_2017_09_10_19_06_01_051.jpg,right_2017_09_10_19_06_01_051.jpg,0,0.4,0,2.986505 | |
center_2017_09_10_19_06_01_118.jpg,left_2017_09_10_19_06_01_118.jpg,right_2017_09_10_19_06_01_118.jpg,0,0.4,0,3.357141 | |
center_2017_09_10_19_06_01_197.jpg,left_2017_09_10_19_06_01_197.jpg,right_2017_09_10_19_06_01_197.jpg,0,0.4,0,3.719582 | |
center_2017_09_10_19_06_01_268.jpg,left_2017_09_10_19_06_01_268.jpg,right_2017_09_10_19_06_01_268.jpg,0,0.4,0,3.987639 | |
center_2017_09_10_19_06_01_337.jpg,left_2017_09_10_19_06_01_337.jpg,right_2017_09_10_19_06_01_337.jpg,0,0.4,0,4.342322 | |
center_2017_09_10_19_06_01_404.jpg,left_2017_09_10_19_06_01_404.jpg,right_2017_09_10_19_06_01_404.jpg,0,0.4,0,4.6061 | |
center_2017_09_10_19_06_01_483.jpg,left_2017_09_10_19_06_01_483.jpg,right_2017_09_10_19_06_01_483.jpg,0,0.4,0,4.956964 | |
center_2017_09_10_19_06_01_552.jpg,left_2017_09_10_19_06_01_552.jpg,right_2017_09_10_19_06_01_552.jpg,0,0.4,0,5.217943 | |
center_2017_09_10_19_06_01_630.jpg,left_2017_09_10_19_06_01_630.jpg,right_2017_09_10_19_06_01_630.jpg,0,0.4,0,5.563562 | |
center_2017_09_10_19_06_01_698.jpg,left_2017_09_10_19_06_01_698.jpg,right_2017_09_10_19_06_01_698.jpg,0,0.4,0,5.906468 | |
center_2017_09_10_19_06_01_768.jpg,left_2017_09_10_19_06_01_768.jpg,right_2017_09_10_19_06_01_768.jpg,0,0.4,0,6.161858 | |
center_2017_09_10_19_06_01_836.jpg,left_2017_09_10_19_06_01_836.jpg,right_2017_09_10_19_06_01_836.jpg,0,0.4,0,6.500007 | |
center_2017_09_10_19_06_01_914.jpg,left_2017_09_10_19_06_01_914.jpg,right_2017_09_10_19_06_01_914.jpg,0,0.4,0,6.835454 | |
center_2017_09_10_19_06_01_981.jpg,left_2017_09_10_19_06_01_981.jpg,right_2017_09_10_19_06_01_981.jpg,0,0.4,0,7.085277 | |
center_2017_09_10_19_06_02_052.jpg,left_2017_09_10_19_06_02_052.jpg,right_2017_09_10_19_06_02_052.jpg,0,0.4,0,7.333351 | |
center_2017_09_10_19_06_02_130.jpg,left_2017_09_10_19_06_02_130.jpg,right_2017_09_10_19_06_02_130.jpg,0,0.4,0,7.660692 | |
center_2017_09_10_19_06_02_198.jpg,left_2017_09_10_19_06_02_198.jpg,right_2017_09_10_19_06_02_198.jpg,0,0.4,0,7.985483 | |
center_2017_09_10_19_06_02_268.jpg,left_2017_09_10_19_06_02_268.jpg,right_2017_09_10_19_06_02_268.jpg,0,0.4,0,8.227386 | |
center_2017_09_10_19_06_02_336.jpg,left_2017_09_10_19_06_02_336.jpg,right_2017_09_10_19_06_02_336.jpg,0,0.4,0,8.547668 | |
center_2017_09_10_19_06_02_415.jpg,left_2017_09_10_19_06_02_415.jpg,right_2017_09_10_19_06_02_415.jpg,0,0.4,0,8.865382 | |
center_2017_09_10_19_06_02_485.jpg,left_2017_09_10_19_06_02_485.jpg,right_2017_09_10_19_06_02_485.jpg,0,0.4,0,9.101989 | |
center_2017_09_10_19_06_02_552.jpg,left_2017_09_10_19_06_02_552.jpg,right_2017_09_10_19_06_02_552.jpg,0,0.4,0,9.337178 | |
center_2017_09_10_19_06_02_619.jpg,left_2017_09_10_19_06_02_619.jpg,right_2017_09_10_19_06_02_619.jpg,0,0.4,0,9.648559 | |
... | |
... | |
2500 more lines for 3 minutes of recording on simple sim, 3 cameras at 320x160x3, full file paths pruned for readabilty .... |
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P3 | |
3 2 | |
255 | |
# The part above is the header | |
# "P3" means this is a RGB color image in ASCII | |
# "3 2" is the width and height of the image in pixels | |
# "255" is the maximum value for each color | |
# The part below is image data: RGB triplets | |
# | |
# taken from https://en.wikipedia.org/wiki/Netpbm_format, lots more info there | |
# | |
255 0 0 0 255 0 0 0 255 | |
255 255 0 255 255 255 0 0 0 |
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import java.io.File; | |
import java.io.FileNotFoundException; | |
import java.io.IOException; | |
import java.io.PrintWriter; | |
import java.net.URL; | |
import java.util.Scanner; | |
public class FileOutputWebInputYahooStockReport { | |
public static void main(String[] args) throws IOException { | |
System.out.println("Starting ..."); | |
// open / get reference to my input and output file | |
// File inputFile = new File("quotes.csv"); | |
// Scanner input = null; | |
URL url = new URL("http://download.finance.yahoo.com" | |
+ "/d/quotes.csv?s=BAC,SBUX,FCX,NVDA&f=sl1d1t1c1ohgv&e=.csv"); | |
Scanner input = null; | |
File outputFile = new File("report.txt"); | |
PrintWriter output = null; | |
try { | |
input = new Scanner(url.openStream()); | |
output = new PrintWriter(outputFile); | |
} catch (FileNotFoundException e) { | |
e.printStackTrace(); | |
System.out.println("Error reading file"); | |
System.exit(0); | |
} | |
// read each line, extract ticker and the price, | |
// print to the report file | |
while(input.hasNext()) { | |
String line = input.nextLine(); | |
String[] tokens = line.split(","); | |
output.println(tokens[0].substring(1, tokens[0].length()-1) + " " + tokens[1]); | |
} | |
input.close(); | |
output.close(); | |
System.out.println("Done."); | |
} | |
} |
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import java.io.File; | |
import java.io.FileNotFoundException; | |
import java.io.PrintWriter; | |
import java.util.Scanner; | |
public class FIleOutputYahooStockReport { | |
public static void main(String[] args) { | |
System.out.println("Starting ..."); | |
// open / get reference to my input and output file | |
File inputFile = new File("quotes.csv"); | |
Scanner input = null; | |
File outputFile = new File("report.txt"); | |
PrintWriter output = null; | |
try { | |
input = new Scanner(inputFile); | |
output = new PrintWriter(outputFile); | |
} catch (FileNotFoundException e) { | |
e.printStackTrace(); | |
System.out.println("Error reading file"); | |
System.exit(0); | |
} | |
// read each line, extract ticker and the price, | |
// print to the report file | |
while(input.hasNext()) { | |
String line = input.nextLine(); | |
String[] tokens = line.split(","); | |
output.println(tokens[0].substring(1, tokens[0].length()-1) + " " + tokens[1]); | |
} | |
input.close(); | |
output.close(); | |
System.out.println("Done."); | |
} | |
} |
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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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http://download.finance.yahoo.com/d/quotes.csv?s=BAC,FCX,NVDA&f=sl1d1t1c1ohgv&e=.csv |
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import java.io.File; | |
import java.io.FileNotFoundException; | |
import java.util.Scanner; | |
public class SOPYahooStockReport { | |
public static void main(String[] args) { | |
// open / get reference to my input file | |
File inputFile = new File("quotes.csv"); | |
Scanner input = null; | |
try { | |
input = new Scanner(inputFile); | |
} catch (FileNotFoundException e) { | |
e.printStackTrace(); | |
System.out.println("Error reading file"); | |
System.exit(0); | |
} | |
// read each line, print to console | |
while(input.hasNext()) { | |
String line = input.nextLine(); | |
String[] tokens = line.split(","); | |
//System.out.println("line = " + line); | |
System.out.println(tokens[0].substring(1, tokens[0].length()-1) + " " + tokens[1]); | |
} | |
// extract ticker and the price | |
} | |
} |
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import java.io.File; | |
import java.io.FileNotFoundException; | |
import java.io.PrintWriter; | |
public class WritingExperiment { | |
public static void main(String[] args) throws FileNotFoundException { | |
System.out.println("Starting ..."); | |
File file = new File("ascii-report.html"); | |
PrintWriter writer = new PrintWriter(file); | |
// write all the header | |
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>"); | |
// loop for processing chars from 65 to 90 | |
for (int i = 65; i <=90; i++) | |
writer.println("<tr><td><p>" + i + "</p></td><td align=\"right\"><p>" + | |
(char)i + "</p></td></tr>"); | |
// write all the footer stuff | |
writer.println("</tbody>"); | |
writer.println("</table>"); | |
writer.println("</html>"); | |
writer.close(); | |
System.out.println("Done."); | |
} | |
} |
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