Java网络编程基础(四) ServerSocket类使用

// SSServerjavaimport javaio*;import *;import javautil*;class SSServer{public static void main (String [] args) throws IOException{Systemoutprintln (Server starting\n); // Create a server socket that listens for incoming connection// requests on port ServerSocket server = new ServerSocket ();while (true){// Listen for incoming connection requests from client// programs establish a connection and return a Socket// object that redivsents this connectionSocket s = serveraccept ();Systemoutprintln (Accepting Connection\n);// Start a thread to handle the connectionnew ServerThread (s)start ();}}}class ServerThread extends Thread{private Socket s;ServerThread (Socket s){thiss = s;}public void run (){BufferedReader br = null;PrintWriter pw = null;try{// Create an input stream reader that chains to the sockets// byteoriented input stream The input stream reader// converts bytes read from the socket to characters The// conversion is based on the platforms default character// setInputStreamReader isr;isr = new InputStreamReader (sgetInputStream ());// Create a buffered reader that chains to the input stream// reader The buffered reader supplies a convenient method// for reading entire lines of textbr = new BufferedReader (isr);// Create a print writer that chains to the sockets byte// oriented output stream The print writer creates an// intermediate output stream writer that converts// characters sent to the socket to bytes The conversion// is based on the platforms default character setpw = new PrintWriter (sgetOutputStream () true);// Create a calendar that makes it possible to obtain date// and time informationCalendar c = CalendargetInstance ();// Because the client program may send multiple commands a// loop is required Keep looping until the client either// explicitly requests termination by sending a command// beginning with letters BYE or implicitly requests// termination by closing its output streamdo{// Obtain the client programs next commandString cmd = brreadLine ();// Exit if client program has closed its output streamif (cmd == null)break;// Convert command to uppercase for ease of comparisoncmd = cmdtoUpperCase ();// If client program sends BYE command terminateif (cmdstartsWith (BYE))break;// If client program sends DATE or TIME command return// current date/time to the client programif (cmdstartsWith (DATE) || cmdstartsWith (TIME))pwprintln (cgetTime ()toString ());// If client program sends DOM (Day Of Month) command// return current day of month to the client programif (cmdstartsWith (DOM))pwprintln ( + cget (CalendarDAY_OF_MONTH));// If client program sends DOW (Day Of Week) command// return current weekday (as a string) to the client// programif (cmdstartsWith (DOW))switch (cget (CalendarDAY_OF_WEEK)){case CalendarSUNDAY : pwprintln (SUNDAY);break;case CalendarMONDAY : pwprintln (MONDAY);break;case CalendarTUESDAY : pwprintln (TUESDAY);break;case CalendarWEDNESDAY: pwprintln (WEDNESDAY);break;case CalendarTHURSDAY : pwprintln (THURSDAY);break;case CalendarFRIDAY : pwprintln (FRIDAY);break;case CalendarSATURDAY : pwprintln (SATURDAY);}// If client program sends DOY (Day of Year) command// return current day of year to the client programif (cmdstartsWith (DOY))pwprintln ( + cget (CalendarDAY_OF_YEAR));// If client program sends PAUSE command sleep for three// secondsif (cmdstartsWith (PAUSE))try{Threadsleep ();}catch (InterruptedException e){}}while (true);{catch (IOException e){Systemoutprintln (etoString ());}finally{Systemoutprintln (Closing Connection\n);try{if (br != null)brclose ();if (pw != null)pwclose ();if (s != null)sclose ();}catch (IOException e){}}}}