Java IO.pdf - Nguyen Dang Binh

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Java I/O so throw a java.lang.UnsupportedOperationException. This is a runtime exception, so you do not have to catch it. public abstract JarFile getJarFile() throws IOException The getJarEntry() method returns an immutable JarEntry object for the JAR entry referred to by this URL. You can read the state of this object, but you cannot change it. Attempts to do so throw a java.lang.UnsupportedOperationException . public JarEntry getJarEntry() throws IOException The getManifest() method returns an immutable Manifest object constructed from the manifest file in the JAR archive. It returns null if the archive doesn't have a manifest. Again, you cannot modify this Manifest object, and any attempt to do so will throw an UnsupportedOperationException. public Manifest getManifest() throws IOException The getAttributes() method returns an Attributes object representing the attributes of the JAR entry this URL refers to. It returns null if the URL refers to a JAR file rather than a particular entry. To get the attributes of the entire archive, use the getMainAttributes() method instead. public Attributes getAttributes() throws IOException public Attributes getMainAttributes() throws IOException The getCertificates() method returns an array of java.security.cert.Certificate objects containing the certificates for the JAR entry this URL refers to (if any). This method returns null if the URL refers to a JAR file rather than a JAR entry. public Certificate[] getCertificates() throws IOException 9.6 File Viewer, Part 4 Because of the nature of filter streams, it is relatively straightforward to add decompression services to the FileDumper program last seen in Chapter 7. Generally, you'll want to decompress a file before dumping it. Adding decompression does not require a new dump filter. Instead, it simply requires passing the file through an inflater input stream before passing it to one of the dump filters. We'll let the user choose from either gzipped or deflated files with the command-line switches -gz and -deflate. When one of these switches is seen, the appropriate inflater input stream is selected; it is an error to select both. Example 9.15, FileDumper4, demonstrates. Example 9.15. FileDumper4 import java.io.*; import java.util.zip.*; import com.macfaq.io.*; public class FileDumper4 { public static final int ASC = 0; 189
public static final int DEC = 1; public static final int HEX = 2; public static final int SHORT = 3; public static final int INT = 4; public static final int LONG = 5; public static final int FLOAT = 6; public static final int DOUBLE = 7; public static void main(String[] args) { Java I/O if (args.length < 1) { System.err.println("Usage: java FileDumper4 [-ahdsilfx] [-little]"+ "[-gzip|-deflated] file1..."); } boolean bigEndian = true; int firstFile = 0; int mode = ASC; boolean deflated = false; boolean gzipped = false; // Process command-line switches. for (firstFile = 0; firstFile < args.length; firstFile++) { if (!args[firstFile].startsWith("-")) break; if (args[firstFile].equals("-h")) mode = HEX; else if (args[firstFile].equals("-d")) mode = DEC; else if (args[firstFile].equals("-s")) mode = SHORT; else if (args[firstFile].equals("-i")) mode = INT; else if (args[firstFile].equals("-l")) mode = LONG; else if (args[firstFile].equals("-f")) mode = FLOAT; else if (args[firstFile].equals("-x")) mode = DOUBLE; else if (args[firstFile].equals("-little")) bigEndian = false; else if (args[firstFile].equals("-deflated") && !gzipped) deflated = true; else if (args[firstFile].equals("-gzip") && !deflated) gzipped = true; } { } for (int i = firstFile; i < args.length; i++) { try { InputStream in = new FileInputStream(args[i]); dump(in, System.out, mode, bigEndian, deflated, gzipped); } if (i < args.length-1) { // more files to dump System.out.println(); System.out.println("--------------------------------------"); System.out.println(); } } catch (Exception e) { System.err.println(e); e.printStackTrace(); } public static void dump(InputStream in, OutputStream out, int mode, boolean bigEndian, boolean deflated, boolean gzipped) throws IOException // The reference variable in may point to several different objects 190
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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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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 174 and 175: Java I/O All high-order Unicode byt
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
Page 194 and 195: public ZipEntry getNextEntry() thro
Page 198 and 199: within the space of the next few li
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
Page 218 and 219: Java I/O them your encryption (publ
Page 220 and 221: Java I/O DES, triple DES (DESede),
Page 222 and 223: IDEA RC2 RC4 Blowfish Java I/O The
Page 224 and 225: Figure 10.2. Encrypting data Java I
Page 226 and 227: } } catch (NoSuchAlgorithmException
Page 228 and 229: } } Java I/O } catch (InvalidKeySpe
Page 230 and 231: SecretKey blowfishKey = blowfishKey
Page 232 and 233: Java I/O public final byte[] doFina
Page 234 and 235: Java I/O A CipherInputStream object
Page 236 and 237: 10.6.2 CipherOutputStream CipherOut
Page 238 and 239: } } byte[] newDigest = sha.digest()
Page 240 and 241: } } else if (args[firstFile].equals
Page 242 and 243: Java I/O Note how little we had to
Page 244 and 245: 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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