Java IO.pdf - Nguyen Dang Binh

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Figure 1.1. An xterm console on Unix Figure 1.2. A DOS shell console on Windows NT Java I/O Many common misconceptions about I/O occur because most programmers' first exposure to I/O is through the console. The console is convenient for quick hacks and toy examples commonly found in textbooks, and I will use it for that in this book, but it's really a very unusual source of input and destination for output, and good Java programs avoid it. It behaves almost, but not completely, unlike anything else you'd want to read from or write to. While consoles make convenient examples in programming texts like this one, they're a horrible user interface and really have little place in modern programs. Users are more comfortable with a well-defined graphical user interface. Furthermore, the console is unreliable across platforms. The Mac, for example, has no native console. Macintosh Runtime for Java 2 and earlier has a console window that works only for output, but not for input; that is, System.out works but System.in does not. [2] Figure 1.3 shows the Mac console window. 2 Console input is supported in MRJ 2.1ea2 and presumably later releases. 27
Figure 1.3. The Mac console, used exclusively by Java programs Java I/O Personal Digital Assistants (PDAs) and other handheld devices running PersonalJava are equally unlikely to waste their small screen space and low resolution on a 1970s-era interface. 1.6.1 Consoles in Applets As well as being unpredictable across platforms, consoles are also unpredictable across web browsers. Netscape provides a "Java console," shown in Figure 1.4, that's used for applets that want to write on System.out. By typing a question mark, you get a list of useful debugging commands that can be executed from the console. Figure 1.4. Netscape Navigator's Java console window The console is turned off by default, and users must explicitly request that it be turned on. Therefore, it's a bad idea to use it in production applets, though it's often useful for debugging. Furthermore, mixing and matching a command line and a graphical user interface is generally a bad idea. Some versions of Microsoft Internet Explorer do not have a visible console. Instead, data written on System.out appears in a log file. On Windows, this file can be found at %Windir%\ java\ javalog.txt. (This probably expands to something like C:\Windows\java\ javalog.txt , depending on the exact value of the %Windir% environment variable). On the Mac the log file is called Java Message Log.html and resides in the same folder as Internet Explorer. To turn this option on, select the Options... menu item from the View menu, click the Advanced tab, then check Enable Java Logging. 28
Page 2 and 3: Java I/O Elliotte Rusty Harold Publ
Page 4 and 5: III: Filter Streams ...............
Page 6 and 7: V: Appendixes .....................
Page 8 and 9: Preface Java I/O In many ways this
Page 10 and 11: Java I/O operations from moving byt
Page 12 and 13: Chapter 9 Chapter 10 Java I/O Chapt
Page 14 and 15: Chapter 17 Java I/O lining up the d
Page 16 and 17: Security Issues Java I/O I don't kn
Page 18 and 19: Java I/O Finally, although many of
Page 20 and 21: Part I: Basic I/O Java I/O 13
Page 22 and 23: Java I/O The word stream is derived
Page 24 and 25: Java I/O The java.util.jar package
Page 26 and 27: Java I/O For instance, according to
Page 28 and 29: Java I/O Java understands several d
Page 30 and 31: Java I/O commonly use an eight-bit
Page 32 and 33: Java I/O For the most part, these c
Page 36 and 37: Java I/O If you absolutely must use
Page 38 and 39: Java I/O in Apple's Macintosh Runti
Page 40 and 41: Java I/O to work inside a web brows
Page 42 and 43: Java I/O bit pattern to a particula
Page 44 and 45: Java I/O The output is the same as
Page 46 and 47: OutputStream out = new NullOutputSt
Page 48 and 49: Figure 2.1. The StreamedTextArea co
Page 50 and 51: Java I/O When you call read(), you
Page 52 and 53: Java I/O try { byte[] b = new byte[
Page 54 and 55: Java I/O Once you have closed an in
Page 56 and 57: public class StreamCopier { } publi
Page 58 and 59: Chapter 4. File Streams Java I/O Un
Page 60 and 61: } } for (int i = 0; i < args.length
Page 62 and 63: Java I/O The FileOutputStream class
Page 64 and 65: Java I/O ASCII format is the defaul
Page 66 and 67: } } } Java I/O if (hex >= 16) Syste
Page 68 and 69: Java I/O Finally, many HTML files c
Page 70 and 71: Java I/O In particular, URL connect
Page 72 and 73: Java I/O Example 5.3 uses these ste
Page 74 and 75: Java I/O many available ports but o
Page 76 and 77: Java I/O inspecting the port. It kn
Page 78 and 79: } } } String response = "Hello " +
Page 80 and 81: } public void actionPerformed(Actio
Page 82 and 83: 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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Java I/O For example, given some Wr
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The flush() and close() methods flu
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15.4 The InputStreamReader Class Th
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Java I/O Similarly, to write text i
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Java I/O These methods behave like
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Java I/O Since string objects are i
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This class has three constructors t
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Do not use the newLine() method if
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Example 15.5. The cat Program impor
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There are four constructors in this
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PipedReader pr = new PipedReader();
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Example 15.7. SourceReader package
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Java I/O question is what to do if
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Java I/O numeric data. If they choo
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} public boolean isText() { if (thi
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default: } } else { LittleEndianInp
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public void init() { } this.addWind
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Chapter 16. Formatted I/O with java
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Java I/O variable salary 12 places
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Hebrew Hebrew Israel iw Hungarian R
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For example: Java I/O NumberFormat
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public void setMaximumIntegerDigits
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Java I/O Like other aspects of text
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Example 16.5. PercentTable import j
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Java I/O align the decimal points i
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Figure 16.1. The PrettiestTable app
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Java I/O This whole class is just a
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Java I/O Most number formats are in
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public int getMultiplier() public v
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Arabic (Saudi Arabia) Arabic (Sudan
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Slovak #,##0.### -1 234,56 #,##0.00
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16.6.2.1 Utility methods Java I/O F
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** * Concrete class for formatting
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} String integerField = digits.subs
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Chapter 17. The Java Communications
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javax.comm.CommPortIdentifier@be4c9
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} } } switch(com.getPortType()) { c
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Java I/O In this example, you see t
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17.2.5 Registering Ports For comple
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} public void run() { } try { byte[
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Java I/O The output buffer size is
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Java I/O Here's the results for bot
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Java I/O If the requested values ar
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Figure 17.1. PC DB-25 serial port t
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public abstract void setRTS(boolean
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Java I/O Steps 1 and 2 should be fa
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Java I/O standard messages on other
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Java I/O serial port events: when t
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17.5.5.3 Step 3 Java I/O In many ci
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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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