Java IO.pdf - Nguyen Dang Binh

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Java I/O All high-order Unicode bytes are discarded before the comment is written onto the zip output stream. Attempts to attach a comment longer than 65,535 characters throw IllegalArgumentExceptions. Each zip output stream can have only one comment (though individual entries may have their own comments too). Resetting the comment erases the previous comment. 9.3.2.3 Set the default compression level and method Next, you may wish to set the default compression method with setMethod(): public void setMethod(int method) You can change the default compression method from stored to deflated or deflated to stored. This default method is used only when the zip entry itself does not specify a compression method. The initial value is ZipOutputStream.DEFLATED (compressed); the alternative is ZipOutputStream.STORED (uncompressed). An IllegalArgumentException is thrown if an unrecognized compression method is specified. You can call this method again at any time before the zip output stream is finished. This sets the default compression method for all subsequent entries in the zip output stream. For example: zout.setMethod(ZipOutputStream.STORED); You can change the default compression level with setLevel() at any time before the zip output stream is finished: public void setLevel(int level) For example: zout.setLevel(9); As with the default method, the zip output stream's default level is used only when the zip entry itself does not specify a compression level. The initial value is Deflater.DEFAULT_COMPRESSION. Valid levels range from (no compression) to 9 (high compression); an IllegalArgumentException is thrown if a compression level outside that range is specified. You can call setLevel() again at any time before the zip output stream is finished, which sets the default compression level for all subsequent entries in the zip output stream. 9.3.2.4 Construct a ZipEntry object and put it in the archive Data is written into the zip output stream in separate groups called zip entries. These are represented by ZipEntry objects. A zip entry must be opened before data is written, and each zip entry must be closed before the next one is opened. The putNextEntry() method opens a new zip entry on the zip output stream: public void putNextEntry(ZipEntry ze) throws IOException If a previous zip entry is still open, it's closed automatically. The properties of the ZipEntry argument ze specify the compression level and method. If ze leaves those unspecified, then the defaults set by the last calls to setLevel() and setMethod() are used. The ZipEntry 167
Java I/O object may also contain a CRC checksum, the time the file was last modified, the size of the file, a comment, and perhaps some optional data with an application-specific meaning (for instance, the resource fork of a Macintosh file). These are set by the setTime(), setSize(), setCrc(), setComment(), and setExtra() methods of the ZipEntry class. (These are not set by the ZipOutputStream class, as they will be different for each file stored in the archive.) 9.3.2.5 Write the entry's data onto the output stream Data is written into the zip entry using the usual write() methods of any output stream. Only one write() method is overridden in ZipOutputStream : public synchronized void write(byte[] data, int offset, int length) throws IOException 9.3.2.6 Close the zip entry Finally, you may want to close the zip entry to prevent any further data from being written to it. For this, use the closeEntry() method: public void closeEntry() throws IOException If an entry is still open when putNextEntry() is called or when you finish the zip output stream, this method will be called automatically. Thus, an explicit invocation is usually unnecessary. 9.3.2.7 Finish the zip output stream A zip file stores meta-information in both the header and the tail of the file. The finish() method writes out this tail information: public void finish() throws IOException Once a zip output stream is finished, no more data may be written to it. However, data may be written to the underlying stream using a separate reference to the underlying stream. In other words, finishing a stream does not close it. 9.3.2.8 Close the zip output stream Most of the time you will want to close a zip output stream at the same time you finish it. ZipOutputStream overrides the close() method inherited from java.util.zip.DeflaterOutputStream. public void close() throws IOException This method finishes the zip output stream and then closes the underlying stream. 9.3.2.9 An example Example 9.10 uses a zip output stream chained to a file output stream to create a single zip archive from a group of files named on the command line. The name of the output zip file and 168
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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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Page 128 and 129: } Java I/O long byte4 = in.read();
Page 130 and 131: 7.9 Thread Safety Java I/O The Litt
Page 132 and 133: public static void main(String[] ar
Page 134 and 135: Table 7.2. Command-Line Switches fo
Page 136 and 137: } protected void fill() throws IOEx
Page 138 and 139: Chapter 8. Streams in Memory Java I
Page 140 and 141: UDP Byte array input and output str
Page 142 and 143: } } try { // So that the buffer doe
Page 144 and 145: Java I/O Otherwise, these classes j
Page 146 and 147: } } catch (IOException e) { // prob
Page 148 and 149: Java I/O legally unencumbered—tha
Page 150 and 151: Java I/O if it doesn't, it will com
Page 152 and 153: Java I/O The first method fills the
Page 154 and 155: public class DirectDeflater { } pub
Page 156 and 157: 9.1.2.1 Constructing inflaters Ther
Page 158 and 159: 9.1.2.7 An example Java I/O Example
Page 160 and 161: Java I/O stream itself, without hav
Page 162 and 163: Java I/O Each inflater input stream
Page 164 and 165: Java I/O This writes all remaining
Page 166 and 167: } } } FileOutputStream fout = new F
Page 168 and 169: } } } catch (IOException e) {System
Page 170 and 171: Java I/O Normally, the name argumen
Page 172 and 173: % java FancyZipLister temp.zip test
Page 176 and 177: Java I/O the files to be stored in
Page 178 and 179: 9.3.3.2 Open the next zip entry Jav
Page 180 and 181: Java I/O Better checksum schemes us
Page 182 and 183: } } int b; while ((b = in.read()) !
Page 184 and 185: Java I/O example, under Unix, to ma
Page 186 and 187: Java I/O archive. If the signatures
Page 188 and 189: Java I/O public JarFile(String file
Page 190 and 191: Java I/O The java.util.jar.Attribut
Page 192 and 193: 9.5.7 Manifest Java I/O What the ja
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Page 196 and 197: Java I/O so throw a java.lang.Unsup
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Page 200 and 201: Chapter 10. Cryptographic Streams J
Page 202 and 203: Java I/O • It should be difficult
Page 204 and 205: Figure 10.1. The four steps to calc
Page 206 and 207: Java I/O you only want to detect si
Page 208 and 209: public void reset() Java I/O In pra
Page 210 and 211: Java I/O After each successful call
Page 212 and 213: } byte[] result = md.digest(); for
Page 214 and 215: } } catch (Exception e) {System.err
Page 216 and 217: public class EasyFileDigest { publi
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Page 222 and 223: 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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