visual basic 6 barcode generator Commonly Used Methods Defined by ObjectInputStream in Java

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Commonly Used Methods Defined by ObjectInputStream
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A FileOutputStream is created that refers to a file named serial, and an ObjectOutputStream is created for that file stream The writeObject( ) method of ObjectOutputStream is then used to serialize our object The object output stream is flushed and closed A FileInputStream is then created that refers to the file named serial, and an ObjectInputStream is created for that file stream The readObject( ) method of ObjectInputStream is then used to deserialize our object The object input stream is then closed Note that MyClass is defined to implement the Serializable interface If this is not done, a NotSerializableException is thrown Try experimenting with this program by
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Input/Output: Exploring javaio
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declaring some of the MyClass instance variables to be transient That data is then not saved during serialization
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import javaio*; public class SerializationDemo { public static void main(String args[]) { // Object serialization try { MyClass object1 = new MyClass("Hello", -7, 27e10); Systemoutprintln("object1: " + object1); FileOutputStream fos = new FileOutputStream("serial"); ObjectOutputStream oos = new ObjectOutputStream(fos); ooswriteObject(object1); oosflush(); oosclose(); } catch(IOException e) { Systemoutprintln("Exception during serialization: " + e); Systemexit(0); } // Object deserialization try { MyClass object2; FileInputStream fis = new FileInputStream("serial"); ObjectInputStream ois = new ObjectInputStream(fis); object2 = (MyClass)oisreadObject(); oisclose(); Systemoutprintln("object2: " + object2); } catch(Exception e) { Systemoutprintln("Exception during deserialization: " + e); Systemexit(0); } } } class MyClass implements Serializable { String s; int i; double d; public MyClass(String s, int i, double d) { thiss = s; thisi = i; thisd = d; } public String toString() { return "s=" + s + "; i=" + i + "; d=" + d; } }
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This program demonstrates that the instance variables of object1 and object2 are identical The output is shown here: object1: s=Hello; i=-7; d=27E10 object2: s=Hello; i=-7; d=27E10
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The streaming interface to I/O in Java provides a clean abstraction for a complex and often cumbersome task The composition of the filtered stream classes allows you to dynamically build the custom streaming interface to suit your data transfer requirements Java programs written to adhere to the abstract, high-level InputStream, OutputStream, Reader, and Writer classes will function properly in the future even when new and improved concrete stream classes are invented As you will see in the next chapter, this model works very well when we switch from a file system ased set of streams to the network and socket streams b Finally, serialization of objects plays an important role in many types of Java programs Java s serialization I/O classes provide a portable solution to this sometimes tricky task
Networking
s all readers know, Java is practically a synonym for Internet programming There are a number of reasons for this, not the least of which is its ability to generate secure, cross-platform, portable code However, one of the most important reasons that Java is the premier language for network programming are the classes defined in the javanet package They provide an easy-to-use means by which programmers of all skill levels can access network resources This chapter explores the javanet package It is important to emphasize that networking is a very large and at times complicated topic It is not possible for this book to discuss all of the capabilities contained in javanet Instead, this chapter focuses on several of its core classes and interfaces
Networking Basics
Before we begin, it will be useful to review some key networking concepts and terms At the core of Java s networking support is the concept of a socket A socket identifies an endpoint in a network The socket paradigm was part of the 42BSD Berkeley UNIX release in the early 1980s Because of this, the term Berkeley socket is also used Sockets are at the foundation of modern networking because a socket allows a single computer to serve many different clients at once, as well as to serve many different types of information This is accomplished through the use of a port, which is a numbered socket on a particular machine A server process is said to listen to a port until a client connects to it A server is allowed to accept multiple clients connected to the same port number, although each session is unique To manage multiple client connections, a server process must be multithreaded or have some other means of multiplexing the simultaneous I/O Socket communication takes place via a protocol Internet Protocol (IP) is a low-level routing protocol that breaks data into small packets and sends them to an address across a network, which does not guarantee to deliver said packets to the destination Transmission Control Protocol (TCP) is a higher-level protocol that manages to robustly string together these packets, sorting and retransmitting them as necessary to reliably transmit data A third protocol, User Datagram Protocol (UDP), sits next to TCP and can be used directly to support fast, connectionless, unreliable transport of packets Once a connection has been established, a higher-level protocol ensues, which is dependent on which port you are using TCP/IP reserves the lower 1,024 ports for specific
Part II:
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