Java IO.pdf - Nguyen Dang Binh

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} public void run() { } try { byte[] buffer = new byte[256]; while (true) { int bytesRead = theInput.read(buffer); if (bytesRead == -1) break; theOutput.write(buffer, 0, bytesRead); } } catch (IOException e) {System.err.println(e);} Java I/O Here's a sample session where I used this program to connect to my ISP. After I logged out, the incoming line rang three times, which you also see: D:\JAVA\16>java PortTyper COM2 at&f at&f OK atdt 321-1444 atdt 321-1444 CONNECT 9600/ARQ Welcome to Cloud 9 Internet! If you're already a user, please login below. To sign up for an account, type 'new', with no password. If you have trouble logging in, please call (914)696-4000. login: elharo elharo Password: ********** Password: ********** Last login: Thu May 28 18:26:14 from 168.100.253.71 Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD 2.2.6-RELEASE (EARL-GREY) #0: Tue May 19 10:39:36 EDT 1998 You have new mail. > logout logo Connection closed. NO CARRIER RING RING RING This program would have been state of the art in 1978. These days, it's rather crude, and you'd have to do a lot of work to develop it further. For one thing, local echo mode should be turned 439
Java I/O off in the modem so that you don't see duplicates of everything you type. (Even my password originally appeared on the screen in clear text. I replaced it with asterisks manually.) And no effort at all is made to perform terminal emulation of any sort. Furthermore, there's no way to exit the program and close the port. Terminating it with a Ctrl-C forces abnormal execution that fails to release control of the port. Nonetheless, it's amazing just how quick and easy it is to write a program that communicates with a simple serial port device. Communicating with a basic daisy-wheel printer would be no harder. 17.3.2 Port Properties The javax.comm.CommPort class has a number of driver-dependent methods for adjusting the properties of the port. These properties are mostly generic characteristics, like buffer size, that may be implemented in software. More specific properties of a particular type of port, like the baud rate of a serial port or the mode of the parallel port, must be set using a more specific subclass, like javax.comm.SerialPort or javax.comm.ParallelPort. The five generic properties are receive threshold, time-out value, receive framing byte, input buffer size, and output buffer size. Four of these properties—receive threshold, receive timeout, receive framing and input buffer size—determine exactly how and when the input stream blocks. The receive threshold specifies the number of bytes that must be available before a call to read() returns. The receive time-out specifies the number of milliseconds that must pass before a call to read() returns. The input buffer size specifies how large a buffer will be provided for the serial port. If the buffer fills up, the read() method returns. For instance, if the receive threshold is set to 5, read() won't return until at least 5 bytes are available. If the receive timeout is set to 10 milliseconds, read() will wait 10 milliseconds before returning. However, if data becomes available before 10 milliseconds are up, read() returns immediately. For example, if the receive threshold is set to 5 bytes and the receive time-out is set to 10 milliseconds, then read() will wait until either 10 milliseconds pass or 5 bytes are available before returning. If the input buffer size is set and the receive threshold is set, the lower of the two values must be reached before read() will return. Finally, if receive framing is enabled, all reads return immediately, regardless of the other values. Table 17.1 summarizes. Receive Threshold Receive Time-out Table 17.1. When Does read() Return? Receive Framing Input Buffer Size read( ) Returns When disabled disabled disabled b bytes Returns when any data is available. n bytes disabled disabled b bytes Returns when either n or b bytes are available, whichever is less. disabled t ms disabled b bytes Returns after t milliseconds or when any data is available. n bytes t ms disabled b bytes Returns after t milliseconds or when either n or b bytes are available, whichever is less. disabled disabled enabled b bytes Returns immediately. n bytes disabled enabled b bytes Returns immediately. disabled t ms enabled b bytes Returns immediately. n bytes t ms enabled b bytes Returns immediately. 440
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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
Page 396 and 397: } public boolean isText() { if (thi
Page 398 and 399: default: } } else { LittleEndianInp
Page 400 and 401: public void init() { } this.addWind
Page 402 and 403: Chapter 16. Formatted I/O with java
Page 404 and 405: Java I/O variable salary 12 places
Page 406 and 407: Hebrew Hebrew Israel iw Hungarian R
Page 408 and 409: For example: Java I/O NumberFormat
Page 410 and 411: public void setMaximumIntegerDigits
Page 412 and 413: Java I/O Like other aspects of text
Page 414 and 415: Example 16.5. PercentTable import j
Page 416 and 417: Java I/O align the decimal points i
Page 418 and 419: Figure 16.1. The PrettiestTable app
Page 420 and 421: Java I/O This whole class is just a
Page 422 and 423: Java I/O Most number formats are in
Page 424 and 425: public int getMultiplier() public v
Page 426 and 427: Arabic (Saudi Arabia) Arabic (Sudan
Page 428 and 429: Slovak #,##0.### -1 234,56 #,##0.00
Page 430 and 431: 16.6.2.1 Utility methods Java I/O F
Page 432 and 433: ** * Concrete class for formatting
Page 434 and 435: } String integerField = digits.subs
Page 436 and 437: Chapter 17. The Java Communications
Page 438 and 439: javax.comm.CommPortIdentifier@be4c9
Page 440 and 441: } } } switch(com.getPortType()) { c
Page 442 and 443: Java I/O In this example, you see t
Page 444 and 445: 17.2.5 Registering Ports For comple
Page 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 472 and 473: Appendix B. Character Sets Java I/O
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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