Java IO.pdf - Nguyen Dang Binh

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Appendix B. Character Sets <strong>Java</strong> I/O The first 128 Unicode characters—that is, characters through 127—are identical to the ASCII character set. 32 is the ASCII space; therefore, 32 is the Unicode space. 33 is the ASCII exclamation point; therefore, 33 is the Unicode exclamation point, and so on. Table B.1 lists this character set. Table B.1. The first 128 Unicode Characters, Also Known as the ASCII Character Set Code Character Code Character Code Character Code Character 0 nul (null) 32 space 64 @ 96 ` 1 soh (start of header) 33 ! 65 A 97 a 2 stx (start of text) 34 " 66 B 98 b 3 etx (end of text) 35 # 67 C 99 c 4 eot (end of transmission) 36 $ 68 D 100 d 5 enq (enquiry) 37 % 69 E 101 e 6 ack (acknowledge) 38 & 70 F 102 f 7 bel (bell) 39 ` 71 G 103 g 8 bs (backspace) 40 ( 72 H 104 h 9 tab (tab) 41 ) 73 I 105 i 10 lf (linefeed) 42 * 74 J 106 j 11 vtb (vertical tab) 43 + 75 K 107 k 12 ff (formfeed) 44 , 76 L 108 l 13 cr (carriage return) 45 - 77 M 109 m 14 so (shift out) 46 . 78 N 110 n 15 si (shift in) 47 / 79 O 111 o 16 dle (data link escape) 48 0 80 P 112 p 17 dc1 (device control 1, XON) 49 1 81 Q 113 q 18 dc2 (device control 2) 50 2 82 R 114 r 19 dc3 (device control 3, XOFF) 51 3 83 S 115 s 20 dc4 (device control 4) 52 4 84 T 116 t 21 nak (negative acknowledge) 53 5 85 U 117 u 22 syn (synchronous idle) 54 6 86 V 118 v 23 etb (end of transmission block) 55 7 87 W 119 w 24 can (cancel) 56 8 88 X 120 x 25 em (end of medium) 57 9 89 Y 121 y 26 sub (substitute) 58 : 90 Z 122 z 27 esc (escape) 59 ; 91 [ 123 { 28 is4 (file separator) 60 < 92 \ 124 | 29 is3 (group separator) 61 = 93 ] 125 } 30 is2 (record separator) 62 > 94 ^ 126 ~ 31 is1 (unit separator) 63 ? 95 _ 127 del (delete) In the first column, characters through 31 are referred to as control characters, because they're traditionally entered by holding down the control key and a letter key (on at least some dumb terminals). For instance Ctrl-H is often ASCII 8, backspace. Ctrl-S is often mapped to ASCII 19, DC3 or XOFF. Ctrl-Q is often mapped to ASCII 17, DC1 or XON. Generally, each control character is entered by pressing the Control key and the printable character whose 465
<strong>Java</strong> I/O ASCII value is the ASCII value of the character you want plus 64 (or 96, if you count from the capitals). Character 127, delete, is also a control character. The common abbreviation for the character is given first, followed by its common meaning. Some of these codes are pretty much obsolete. For instance, I'm not aware of any modern OS that actually uses characters 28 through 31 as file, group, record, and unit separators. Those control codes that are still used often have different meanings on different platforms. For example, character 10, the linefeed, originally meant move the platen on the printer up one line, while character 13, the carriage return, meant return the print-head to the beginning of the line. On paper-based teletype terminals, this could be used to position the print-head anywhere on a page and perhaps overtype characters that had already been typed. This no longer makes sense in an era of glass terminals and GUIs, so linefeed has come to mean a generic end-of-line character. The next 128 Unicode characters—that is 128 through 255—have the same values as the equivalent characters in the Latin-1 character set defined in ISO standard 8859-1. Latin-1, a slight variation of which is used by Windows, adds the various accented characters, umlauts, cedillas, upside-down question marks, and other characters needed to write text in most Western European languages. Table B.2 shows these characters. The first 128 characters in Latin-1 are the ASCII characters shown in Table B.1. Table B.2. Unicode Characters Between 128 and 255, Also the Second Half of the ISO 8859-1 Latin-1 Character Set Code Character Code Character Code Character Code Character 128 pad (padding character) 160 non-breaking space 192 À 224 à 129 hop (high octet preset) 161 ¡ 193 Á 225 á 130 bph (break permitted here) 162 ¢ 194 Â 226 â 131 nbh (no break here) 163 £ 195 Ã 227 ã 132 ind (index) 164 196 Ä 228 ä 133 nel (next line) 165 ¥ 197 Å 229 å 134 ssa (start of selected area) 166 | 198 Æ 230 æ 135 esa (end of selected area) 167 § 199 Ç 231 ç 136 hts (character tabulation set) 168 200 È 232 è 137 htj (character justification) tabulation with 169 © 201 É 233 é 138 vts (line tabulation set) 170 ª 202 Ê 234 ê 139 pld (partial line forward) 171 « 203 Ë 235 ë 140 plu (partial line backward) 172 ¬ 204 Ì 236 ì 141 ri (reverse line feed) 173 soft hyphen (optional) 205 Í 237 í 142 ss2 (single-shift two) 174 ® 206 Î 238 î 143 ss3 (single-shift three) 175 ¯ 207 Ï 239 ï 144 dcs (device control string) 176 (degree) 208 Ð 240 ð 145 pu1 (private use one) 177 ± 209 Ñ 241 ñ 146 pu2 (private use two) 178 2 210 Ò 242 ò 147 sts (set transmit state) 179 3 211 Ó 243 ó 148 cch (cancel character) 180 ´ 212 Ô 244 ô 149 mw (message waiting ) 181 213 Õ 245 õ 150 spa (start of guarded area) 182 214 Ö 246 ö 466
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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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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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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
Page 468 and 469: A.5 Data Compression Java I/O Java
Page 470 and 471: Java I/O "Developing International
Page 474 and 475: 151 epa (end of guarded area) 183
Page 476 and 477: Java I/O Cp857 DOS ASCII plus Turki
Page 478 and 479: Java I/O As extensive as this list
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