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int getOffset( ) int getPort( ) void setAddress(InetAddress ipAddress) void setData(byte[ ] data) void setData(byte[ ] data, int idx, int size) void setLength(int size) void setPort(int port)
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Returns the starting index of the data Returns the port number Sets the address to which a packet will be sent The address is specified by ipAddress Sets the data to data, the offset to zero, and the length to number of bytes in data Sets the data to data, the offset to idx, and the length to size Sets the length of the packet to size Sets the port to port
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A Datagram Example
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The following example implements a very simple networked communications client and server Messages are typed into the window at the server and written across the network to the client side, where they are displayed
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// Demonstrate datagrams import javanet*; class WriteServer { public static int serverPort = 998; public static int clientPort = 999; public static int buffer_size = 1024; public static DatagramSocket ds; public static byte buffer[] = new byte[buffer_size]; public static void TheServer() throws Exception { int pos=0; while (true) { int c = Systeminread(); switch (c) { case -1: Systemoutprintln("Server Quits"); return; case '\r': break; case '\n': dssend(new DatagramPacket(buffer,pos, InetAddressgetLocalHost(),clientPort)); pos=0; break; default: buffer[pos++] = (byte) c; } } }
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Part II:
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The Java Library
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public static void TheClient() throws Exception { while(true) { DatagramPacket p = new DatagramPacket(buffer, bufferlength); dsreceive(p); Systemoutprintln(new String(pgetData(), 0, pgetLength())); } } public static void main(String args[]) throws Exception { if(argslength == 1) { ds = new DatagramSocket(serverPort); TheServer(); } else { ds = new DatagramSocket(clientPort); TheClient(); } } }
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This sample program is restricted by the DatagramSocket constructor to running between two ports on the local machine To use the program, run
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java WriteServer
in one window; this will be the client Then run
java WriteServer 1
This will be the server Anything that is typed in the server window will be sent to the client window after a newline is received
The Applet Class
his chapter examines the Applet class, which provides the foundation for applets The Applet class is contained in the javaapplet package Applet contains several methods that give you detailed control over the execution of your applet In addition, javaapplet also defines three interfaces: AppletContext, AudioClip, and AppletStub
Two Types of Applets
It is important to state at the outset that there are two varieties of applets The first are those based directly on the Applet class described in this chapter These applets use the Abstract Window Toolkit (AWT) to provide the graphic user interface (or use no GUI at all) This style of applet has been available since Java was first created The second type of applets are those based on the Swing class JApplet Swing applets use the Swing classes to provide the GUI Swing offers a richer and often easier-to-use user interface than does the AWT Thus, Swing-based applets are now the most popular However, traditional AWT-based applets are still used, especially when only a very simple user interface is required Thus, both AWT- and Swing-based applets are valid Because JApplet inherits Applet, all the features of Applet are also available in JApplet, and most of the information in this chapter applies to both types of applets Therefore, even if you are interested in only Swing applets, the information in this chapter is still relevant and necessary Understand, however, that when creating Swing-based applets, some additional constraints apply and these are described later in this book, when Swing is covered
NOTE For information on building applets when using Swing, see 29
Applet Basics
13 introduced the general form of an applet and the steps necessary to compile and run one Let s begin by reviewing this information All applets are subclasses (either directly or indirectly) of Applet Applets are not stand-alone programs Instead, they run within either a web browser or an applet viewer The illustrations shown in this chapter were created with the standard applet viewer, called appletviewer, provided by the JDK But you can use any applet viewer or browser you like Execution of an applet does not begin at main( ) Actually, few applets even have main( ) methods Instead, execution of an applet is started and controlled with an entirely different
Part II:
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