Java IO.pdf - Nguyen Dang Binh

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public abstract void setRTS(boolean rts) public abstract boolean isRTS() 17.4.3.3 CTS Java I/O Clear To Send, CTS, is the other half of hardware handshaking. The modem raises the voltage on this wire to tell the computer that it's ready to receive data. It drops the voltage when it's no longer ready to receive data. public abstract boolean isCTS() You cannot set the Clear To Send wire directly. Only the serial device can tell you when it is ready to receive. You cannot force it to be ready. 17.4.3.4 DSR The modem raises the voltage on the DSR line, Data Set Ready, to indicate that it's turned on and operating. This line is also read-only. public abstract boolean isDSR() 17.4.3.5 RI The modem raises the voltage on the RI wire, Ring Indicator, to tell the computer that the phone is ringing. public abstract boolean isRI() You cannot set the Ring Indicator bit directly. This is used only for one-way communication from the device back to the computer, not for the computer to send information to the device. (In other words, the computer can't tell the modem the phone is ringing.) 17.4.3.6 CD The modem uses the CD wire, Carrier Detect, to tell the computer that it has successfully negotiated the low-level modem protocols with the modem on the other end of the connection. public abstract boolean isCD() You cannot set the Carrier Detect bit directly. This is used only for one-way communication from the device back to the computer, not for the computer to send information to the device. 17.4.4 Serial Port Events The examples shown so far all depended on the computer taking the initiative. The computer tells the modem when to dial, the printer when to print, and so on. By analogy with network programming, this is client-based. However, there's another model for port programs, the server-based program. Just as an Internet server waits for an incoming connection, a program can wait for incoming faxes through a fax modem, incoming BBS connections through a modem, notifications of impending shutdown from an uninterruptable power supply, paperempty messages from a printer on a parallel port, and more. However, unlike the abstract network ports of Chapter 5, computers have no concept of binding to a serial port, at least 449
Java I/O within the Java Comm API. Although you can check the various pins used to send information from a modem or other serial port device to the computer whenever you want to, it's more convenient to do it asynchronously. Incoming port access relies on an event-based model; in fact, the same model used by JavaBeans and the AWT 1.1 and later. When the runtime detects a change in state at a monitored serial port, it fires a serial port event to the registered serial port listener. The SerialPortEvent class has a public constructor, but you shouldn't use it. Instead, the VM creates and fires serial port events to indicate a change on one of the standard serial port lines: public SerialPortEvent (SerialPort src, int type, boolean oldValue, boolean newValue) The javax.comm.SerialPortEvent class declares these three public methods: public int getEventType() public boolean getNewValue() public boolean getOldValue() The getEventType() method returns a named constant from the SerialPortEvent class that specifies what caused the event to be fired. There are 10 possibilities: SerialPortEvent.DATA_AVAILABLE // Data has arrived at the port. SerialPortEvent.OUTPUT_BUFFER_EMPTY // Output buffer on the port is empty. SerialPortEvent.CTS // The Clear To Send pin has changed state. SerialPortEvent.DSR // The Data Set Ready pin has changed state. SerialPortEvent.RI // The Ring Indicator pin has changed state. SerialPortEvent.CD // The Carrier Detect pin has changed state. SerialPortEvent.OE // An overrun error occurred. SerialPortEvent.PE // A parity error occurred. SerialPortEvent.FE // A framing error occurred. SerialPortEvent.BI // A break interrupt was detected. SerialPortEvent.DATA_AVAILABLE and SerialPortEvent.OUTPUT_BUFFER_EMPTY are enough information all by themselves. The other eight possible types, however, represent a boolean change from one state to another, from on to off or off to on. Therefore, there are also getNewValue() and getOldValue() methods to tell you what the state of the pin was before and after the event: public boolean getNewValue() public boolean getOldValue() 17.4.5 Serial Port Event Listeners There are three steps to respond to serial port events: 1. Implement the SerialPortEventListener interface. 2. Register your SerialPortEventListener object with the SerialPort object representing the serial port you want to monitor. 3. Tell the SerialPort object the types of events you want to be notified of. 450
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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
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 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 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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