JAVA BIO Server and client implementation examples

The code is compatible with Java version 7 and above only.

Server-side code:

Package com.stevex.app.bio;import java.io.bufferedreader;import java.io.ioexception;import  java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import  java.net.socket;import javax.net.serversocketfactory;public class xiaona {public  Static void main (String[] args) {Xiaona xiaona = new xiaona (); serversocket serversocket = null; socket socket = null;try {//can set the length of the Client connection request queue, such as 5, and reject the connection request after the queue length exceeds 5//serversocket =  Serversocketfactory.getdefault (). Createserversocket (8383, 5);serversocket =  Serversocketfactory.getdefault (). Createserversocket (8383); while (true) {try{//listens until a connection is accepted and returns a new socket object socket  = serversocket.accept ();//block//new a thread handles connection request New thread (Xiaona.new worker (socket)). Start ();;} catch  (throwable e)  {//prevents an exception from being killed by the server E.printstacktrace ();}}  catch  (ioexception e)  {E.PRintstacktrace ();} Finally{try {if (socket != null) {socket.close ();}}  catch  (ioexception e)  {e.printstacktrace ();}} Private static string getanswer (string question) {string answer = null; Switch (question) {case  "who":answer =  "I'm Cortana";break;case  "what":answer =  "I'm here to help you with your sorrows. ";break;case " where ":answer = " I'm from Outer space ";break;default:answer = " Please enter  who,  or what,  or where ";} Return answer;} private class worker implements runnable{private socket socket;public  Worker (socket socket) {this.socket = socket;} @Overridepublic  void run ()  {BufferedReader reader = null; Printwriter writer = null;try {reader = new bufferedreader (new  InputStreamReader (Socket.getinputstream ())); Writer = new printwriter (Socket.getOutputStream ()); String question&nBsp;= reader.readline ();//no content blocks while (!question.equals ("over")) {String answer = getanswer (question); Writer.println (answer); Question = reader.readline ();} Writer.println ("over");//over as Operation complete password writer.flush (); if (writer != null) {writer.close ();} if (reader != null) {reader.close ();}}  catch  (ioexception e)  {e.printstacktrace ();}}}

Client code:

Package com.stevex.app.bio;import java.io.bufferedreader;import java.io.ioexception;import  java.io.inputstreamreader;import java.io.printwriter;import java.net.socket;public class  client {public static void main (String[] args)  {Client c =  New client ();//Type 20 threads to initiate the socket client connection request for (int i=0; i<20; i++) {New thread (c.new  Worker ()). Start ();}} private class worker implements runnable{@Overridepublic  void run ()  {Socket  socket = null; bufferedreader reader = null; printwriter writer = null;try {//creates a Socket and connects to the specified target server socket = new socket ( "localhost",  8383); Reader = new bufferedreader (New inputstreamreader ( Socket.getinputstream ())); Writer = new printwriter (Socket.getoutputstream ()); Writer.println (" Writer.println ("what"); Writer.println ("whereWriter.println ("over");//over as the operation complete the Code Writer.flush (); String answer = reader.readline ();//no content blocks while (! answer.equals ("over")) { System.out.println (Thread.CurrentThread (). GetId ()  +  "---message from server:"  +  Answer); Answer = reader.readline ();}}  catch  (ioexception e)  {e.printstacktrace ();}  finally {try {if  (Writer != null)  {writer.close ();} if  (Reader != null)  {reader.close ();} if  (Socket != null)  {socket.close ();}}  catch  (ioexception e)  {e.printstacktrace ();}}}}

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JAVA BIO Server and client implementation examples