Java IO.pdf - Nguyen Dang Binh

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Figure 16.1. The PrettiestTable applet Example 16.7. PrettiestTable import java.text.*; import java.applet.*; import java.awt.*; public class PrettiestTable extends Applet { NumberFormat myFormat = NumberFormat.getNumberInstance(); FieldPosition fp = new FieldPosition(NumberFormat.INTEGER_FIELD); public void init() { } y); y); this.setFont(new Font("Serif", Font.BOLD, 12)); myFormat.setMaximumIntegerDigits(3); myFormat.setMaximumFractionDigits(2); myFormat.setMinimumFractionDigits(2); public void paint(Graphics g) { Java I/O FontMetrics fm = this.getFontMetrics(this.getFont()) ; int xmargin = 5; int lineHeight = fm.getMaxAscent() + fm.getMaxDescent(); int y = lineHeight; int x = xmargin; int desiredPixelWidth = 3 * fm.getMaxAdvance(); int fieldWidth = 6 * fm.getMaxAdvance(); int headerWidth = fm.stringWidth("Degrees"); g.drawString("Degrees", x + (fieldWidth - headerWidth)/2, y); headerWidth = fm.stringWidth("Radians"); g.drawString("Radians", x + fieldWidth + (fieldWidth - headerWidth)/2, headerWidth = fm.stringWidth("Grads"); g.drawString("Grads", x + 2*fieldWidth + (fieldWidth - headerWidth)/2, 411
for (double degrees = 0.0; degrees < 360.0; degrees++) { y += lineHeight; String degreeString = myFormat.format(degrees, new StringBuffer(), fp).toString(); String intPart = degreeString.substring(0, fp.getEndIndex()); g.drawString(degreeString, xmargin + desiredPixelWidth - fm.stringWidth(intPart), y); String radianString = myFormat.format(Math.PI*degrees/180.0, new StringBuffer(), fp).toString(); intPart = radianString.substring(0, fp.getEndIndex()); g.drawString(radianString, xmargin + fieldWidth + desiredPixelWidth - fm.stringWidth(intPart), y); String gradString = myFormat.format(400 * degrees / 360, new StringBuffer(), fp).toString(); intPart = gradString.substring(0, fp.getEndIndex()); g.drawString(gradString, xmargin + 2*fieldWidth + desiredPixelWidth - fm.stringWidth(intPart), y); } } } 16.5 Parsing Input Java I/O Number formats also handle input. When used for input, a number format converts a string in the appropriate format to a binary number, achieving more flexible conversions than you can get with the methods in the type wrapper classes (like Integer.parseInt()). For instance, a percent format parse() method can interpret 57% as 0.57 instead of 57. A currency format can read (12.45) as -12.45. There are three parse() methods in the NumberFormat class. All do roughly the same thing: public Number parse(String text) throws ParseException public abstract Number parse(String text, ParsePosition parsePosition) public final Object parseObject(String source, ParsePosition parsePosition) The first parse() method attempts to parse a number from the given text. If the text represents an integer, it's returned as an instance of java.lang.Long. Otherwise, it's returned as an instance of java.lang.Double. If a string contains multiple numbers, only the first one is returned. For instance, if you parse "32 meters" you'll get the number 32 back. Java throws away everything after the number finishes. If the text cannot be interpreted as a number in the given format, a ParseException is thrown. The second parse() method specifies where in the text parsing starts. The position is given by a ParsePosition object. This is a little more complicated than using a simple int but does have the advantage of allowing one to read successive numbers from the same string. The third parse() method merely invokes the second. It's declared to return Object rather than Number so that it can override the method of the same signature in java.text.Format. If you know you're working with a NumberFormat rather than a DateFormat or some other nonnumeric format, there's no reason to use it. The java.text.ParsePosition class has one constructor and two public methods: public ParsePosition(int index) public int getIndex() public void setIndex(int index) 412
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Java I/O Elliotte Rusty Harold Publ
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III: Filter Streams ...............
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V: Appendixes .....................
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Preface Java I/O In many ways this
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Java I/O operations from moving byt
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Chapter 9 Chapter 10 Java I/O Chapt
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Chapter 17 Java I/O lining up the d
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Security Issues Java I/O I don't kn
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Java I/O Finally, although many of
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Part I: Basic I/O Java I/O 13
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Java I/O The word stream is derived
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Java I/O The java.util.jar package
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Java I/O For instance, according to
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Java I/O Java understands several d
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Java I/O commonly use an eight-bit
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Java I/O For the most part, these c
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Figure 1.1. An xterm console on Uni
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Java I/O If you absolutely must use
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Java I/O in Apple's Macintosh Runti
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Java I/O to work inside a web brows
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Java I/O bit pattern to a particula
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Java I/O The output is the same as
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OutputStream out = new NullOutputSt
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Figure 2.1. The StreamedTextArea co
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Java I/O When you call read(), you
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Java I/O try { byte[] b = new byte[
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Java I/O Once you have closed an in
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public class StreamCopier { } publi
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Chapter 4. File Streams Java I/O Un
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} } for (int i = 0; i < args.length
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Java I/O The FileOutputStream class
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Java I/O ASCII format is the defaul
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} } } Java I/O if (hex >= 16) Syste
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Java I/O Finally, many HTML files c
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Java I/O In particular, URL connect
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Java I/O Example 5.3 uses these ste
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Java I/O many available ports but o
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Java I/O inspecting the port. It kn
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} } } String response = "Hello " +
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} public void actionPerformed(Actio
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Chapter 6. Filter Streams Java I/O
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Java I/O output stream, out. Among
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Java I/O SourceFile???StringExtract
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6.3 Buffered Streams Java I/O Buffe
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public boolean markSupported() Java
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The compiler rewrites this complica
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public class TeeCopier { } public s
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} } try { FileInputStream fin = new
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} public int available() throws IOE
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public class HexFilter extends Dump
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} } StreamCopier.copy(in, out); in.
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Java I/O the java.io.DataOutput int
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Java I/O Although other schemes are
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} public static void main(String ar
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Java I/O Since Java has no unsigned
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dout.close(); } catch (IOException
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Java I/O The DataInputStream class
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Java I/O The readLine() method read
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7.7 Miscellaneous Methods Java I/O
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public synchronized void write(int
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** * Writes a 4 byte Java float to
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} * possible that this number is te
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*/ public byte readByte(int b) thro
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} Java I/O long byte4 = in.read();
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7.9 Thread Safety Java I/O The Litt
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public static void main(String[] ar
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Table 7.2. Command-Line Switches fo
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} protected void fill() throws IOEx
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Chapter 8. Streams in Memory Java I
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UDP Byte array input and output str
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} } try { // So that the buffer doe
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Java I/O Otherwise, these classes j
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} } catch (IOException e) { // prob
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Java I/O legally unencumbered—tha
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Java I/O if it doesn't, it will com
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Java I/O The first method fills the
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public class DirectDeflater { } pub
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9.1.2.1 Constructing inflaters Ther
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9.1.2.7 An example Java I/O Example
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Java I/O stream itself, without hav
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Java I/O Each inflater input stream
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Java I/O This writes all remaining
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} } } FileOutputStream fout = new F
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} } } catch (IOException e) {System
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Java I/O Normally, the name argumen
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% java FancyZipLister temp.zip test
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Java I/O All high-order Unicode byt
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Java I/O the files to be stored in
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9.3.3.2 Open the next zip entry Jav
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Java I/O Better checksum schemes us
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} } int b; while ((b = in.read()) !
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Java I/O example, under Unix, to ma
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Java I/O archive. If the signatures
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Java I/O public JarFile(String file
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Java I/O The java.util.jar.Attribut
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9.5.7 Manifest Java I/O What the ja
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public ZipEntry getNextEntry() thro
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Java I/O so throw a java.lang.Unsup
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within the space of the next few li
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Chapter 10. Cryptographic Streams J
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Java I/O • It should be difficult
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Figure 10.1. The four steps to calc
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Java I/O you only want to detect si
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public void reset() Java I/O In pra
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Java I/O After each successful call
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} byte[] result = md.digest(); for
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} } catch (Exception e) {System.err
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public class EasyFileDigest { publi
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Java I/O them your encryption (publ
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Java I/O DES, triple DES (DESede),
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IDEA RC2 RC4 Blowfish Java I/O The
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Figure 10.2. Encrypting data Java I
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} } catch (NoSuchAlgorithmException
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} } Java I/O } catch (InvalidKeySpe
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SecretKey blowfishKey = blowfishKey
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Java I/O public final byte[] doFina
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Java I/O A CipherInputStream object
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10.6.2 CipherOutputStream CipherOut
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} } byte[] newDigest = sha.digest()
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} } else if (args[firstFile].equals
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Java I/O Note how little we had to
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Chapter 11. Object Serialization Ja
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Java I/O To write an object onto a
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Java I/O Needless to say, this is a
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Java I/O java.awt.image.renderable
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Java I/O are not serializable, then
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11.5.1.5 Making nonserializable fie
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Java I/O output streams, but DataIn
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Figure 11.2. The serialver GUI Java
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public SerializableZipFile(File fil
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public class NetworkWindow extends
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private void writeObject(ObjectOutp
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} } Vector v = (Vector) oin.readObj
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Java I/O the resolveClass() method
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Example 11.6. Person import java.ut
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public class SealedPoint { } public
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Chapter 12. Working with Files Java
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Java I/O not begin with an @. Under
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Java I/O placing a minus sign befor
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Java I/O rush to snap up all the go
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System Properties System properties
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Java I/O complete list of the ASCII
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Win32 index.html MacOS index.html N
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Java I/O The path argument should b
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Java I/O assume the array returned
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Example 12.2. Paths import java.io.
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String canonicalPath = f.getCanonic
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Java I/O The isHidden() method, onl
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12.3.4 Manipulating Files Java I/O
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fin.close(); src.delete(); Java I/O
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public int hashCode() public boolea
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public class DirList { } File direc
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12.4 Filename Filters Java I/O You
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} } for (int i = 0; i < htmlFiles.l
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public RandomAccessFile(File file,
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Java I/O • Do not parse pathnames
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Figure 13.2. Motif standard Open di
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Java I/O Example 13.1 is a program
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} } // Work around annoying AWT non
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} // Clean up our windows, they won
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13.2.2 Displaying File Choosers Jav
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13.2.5 Custom Dialogs Java I/O File
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Figure 13.4. The choosable file fil
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Example 13.7. JavaChooser import ja
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13.2.7 Selecting Directories Java I
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public void setFileView(fileView) p
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13.2.12.1 Action events Java I/O Wh
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public TextFilePreview(JFileChooser
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13.3 File Viewer, Part 6 Java I/O W
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} } } theView.setText(""); OutputSt
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} } return deflated.isSelected(); p
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Java I/O Chapter 14. Multilingual C
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Java I/O the upper 128 characters o
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makeBlock("Telugu", 0x0C00, 0x0C7F)
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} } for (int i = 0; i < names.lengt
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14.3 Unicode Escapes Java I/O Curre
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0 0 0 0 0 x10 x9 x8 x7 x6 x5 x4 x3
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Character g = new Character('g'); C
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Java I/O two Latin letters. In uppe
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Java I/O tie, and a few similar cha
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Java I/O The most common type of ch
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Java I/O encoding into a new file c
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Java I/O String openingLineInUnicod
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Page 370 and 371: The flush() and close() methods flu
Page 372 and 373: 15.4 The InputStreamReader Class Th
Page 374 and 375: Java I/O Similarly, to write text i
Page 376 and 377: Java I/O These methods behave like
Page 378 and 379: Java I/O Since string objects are i
Page 380 and 381: This class has three constructors t
Page 382 and 383: Do not use the newLine() method if
Page 384 and 385: Example 15.5. The cat Program impor
Page 386 and 387: There are four constructors in this
Page 388 and 389: PipedReader pr = new PipedReader();
Page 390 and 391: Example 15.7. SourceReader package
Page 392 and 393: Java I/O question is what to do if
Page 394 and 395: Java I/O numeric data. If they choo
Page 396 and 397: } public boolean isText() { if (thi
Page 398 and 399: default: } } else { LittleEndianInp
Page 400 and 401: public void init() { } this.addWind
Page 402 and 403: Chapter 16. Formatted I/O with java
Page 404 and 405: Java I/O variable salary 12 places
Page 406 and 407: Hebrew Hebrew Israel iw Hungarian R
Page 408 and 409: For example: Java I/O NumberFormat
Page 410 and 411: public void setMaximumIntegerDigits
Page 412 and 413: Java I/O Like other aspects of text
Page 414 and 415: Example 16.5. PercentTable import j
Page 416 and 417: Java I/O align the decimal points i
Page 420 and 421: Java I/O This whole class is just a
Page 422 and 423: Java I/O Most number formats are in
Page 424 and 425: public int getMultiplier() public v
Page 426 and 427: Arabic (Saudi Arabia) Arabic (Sudan
Page 428 and 429: Slovak #,##0.### -1 234,56 #,##0.00
Page 430 and 431: 16.6.2.1 Utility methods Java I/O F
Page 432 and 433: ** * Concrete class for formatting
Page 434 and 435: } String integerField = digits.subs
Page 436 and 437: Chapter 17. The Java Communications
Page 438 and 439: javax.comm.CommPortIdentifier@be4c9
Page 440 and 441: } } } switch(com.getPortType()) { c
Page 442 and 443: Java I/O In this example, you see t
Page 444 and 445: 17.2.5 Registering Ports For comple
Page 446 and 447: } public void run() { } try { byte[
Page 448 and 449: Java I/O The output buffer size is
Page 450 and 451: Java I/O Here's the results for bot
Page 452 and 453: Java I/O If the requested values ar
Page 454 and 455: Figure 17.1. PC DB-25 serial port t
Page 456 and 457: public abstract void setRTS(boolean
Page 458 and 459: Java I/O Steps 1 and 2 should be fa
Page 460 and 461: Java I/O standard messages on other
Page 462 and 463: Java I/O serial port events: when t
Page 464 and 465: 17.5.5.3 Step 3 Java I/O In many ci
Page 466 and 467: Appendix A. Additional Resources Ja
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A.5 Data Compression Java I/O Java
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Java I/O "Developing International
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Appendix B. Character Sets Java I/O
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151 epa (end of guarded area) 183
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Java I/O Cp857 DOS ASCII plus Turki
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Java I/O As extensive as this list
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