Server-Side Java - Java - page 648

Solution

The socket gives you an InputStream and an OutputStream . Use them.

Discussion

The client socket examples in the previous chapter called the getInputStream() and
getOutputStream() methods. These examples do the same. The main difference is that
these ones get the socket from a ServerSocket 's accept() method. Another distinction is,
by definition, that normally the server creates or modifies the data and sends it to the client.
Example 16-3 is a simple Echo server, which the Echo client of Reading and Writing Textual
Data can connect to. This server handles one complete connection with a client, then goes
back and does the accept() to wait for the next client.

Example 16-3. EchoServer.java
public public class EchoServer {

/** Our server-side rendezvous socket */
protected

class EchoServer

protected ServerSocket sock ;
/** The port number to use by default */
public public final int ECHOPORT = 7 ;

/** Flag to control debugging */
protected

final static static int

protected boolean boolean debug = true true ;

/** main: construct and run */
public

public static static void void main ( String [] args ) {

int int p = ECHOPORT ;

iif ( args . length == 1 ) {
try

try {
p = Integer . parseInt ( args [ 0 ]);
} catch catch ( NumberFormatException e ) {

System . err . println ( "Usage: EchoServer [port#]" );
System . exit ( 1 );

}

}
new new EchoServer ( p ). handle ();

}

/** Construct an EchoServer on the given port number */
public

public EchoServer ( int int port ) {

try try {

sock = new new ServerSocket ( port );

} catch catch ( IOException e ) {

System . err . println ( "I/O error in setup" );