程序實現(xiàn)基于星型結構（服務器接收來自各個客戶端發(fā)送的信息，然后將信息傳遞給其他客戶端界面并在其他客戶端界面顯示發(fā)送的信息）

客戶端代碼：

package netProgram;import java.io.IOException;import java.net.Socket;import java.net.SocketAddress;public class Client implements ScreenInputInterface{ private SocketHandler socketHandler; public void start(){new Thread(new ScreenInputRunIns(this)).start();try { socketHandler = new SocketHandler(new Socket('127.0.0.1',666),null); new Thread(socketHandler).start();} catch (IOException e) { e.printStackTrace();} } @Override public void send(String msg) {socketHandler.sendMsg(msg); } /* @Override public void send(String msg, SocketAddress address) {socketHandler.sendMsg(msg); }*/}

服務端代碼：

package netProgram;import java.io.IOException;import java.net.ServerSocket;import java.net.SocketAddress;import java.util.ArrayList;import java.util.List;public class Server implements ScreenInputInterface{ private List<SocketHandler> clients = new ArrayList<>(); private ServerSocket serverSocket; public void start(){//new Thread(new ScreenInputRunIns(this)).start();try { serverSocket = new ServerSocket(666); while (true){SocketHandler socketHandler = new SocketHandler(serverSocket.accept(),this);clients.add(socketHandler);System.out.println(socketHandler.getSocket().getRemoteSocketAddress()+'進入聊天系統(tǒng)');new Thread(socketHandler).start(); }} catch (IOException e) { e.printStackTrace();} } @Override public void send(String msg) {for (SocketHandler s:clients) { s.sendMsg(msg);} } /* @Override public void send(String msg, SocketAddress address) {for (SocketHandler s:clients) { if (s.getSocket().getRemoteSocketAddress().equals(address)){continue; } s.sendMsg(msg);} }*/ public static void main(String[] args) {new Server().start(); }}

屏幕輸入信息接口：

package netProgram;import java.net.SocketAddress;public interface ScreenInputInterface { void send(String msg);// void send(String msg, SocketAddress address);}

用于各個端口輸入信息的創(chuàng)建的線程對象：

package netProgram;import java.util.Scanner;public class ScreenInputRunIns implements Runnable{ private ScreenInputInterface screenInputInterface; private Scanner input = new Scanner(System.in); public ScreenInputRunIns(ScreenInputInterface screenInputInterface) {this.screenInputInterface = screenInputInterface; } @Override public void run() {//屏幕實時輸入while (true){ String msg = input.nextLine();// screenInputInterface.send(msg,null); screenInputInterface.send(msg);} }}

套接字處理器（用于傳輸數(shù)據(jù)：實際發(fā)送信息到輸出流并實時監(jiān)聽各個端口的輸入且負責顯示）：

package netProgram;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;public class SocketHandler implements Runnable{ private String clientName; private Socket socket; private PrintWriter writer; private Server server; public SocketHandler(Socket socket,Server server) throws IOException {this.socket = socket;this.server = server;clientName = '<'+socket.getLocalSocketAddress()+'>';writer = new PrintWriter(this.socket.getOutputStream()); } public Socket getSocket() {return socket; } public void sendMsg(String msg){if (server!=null) writer.println(msg);else writer.println(clientName+':'+msg);writer.flush(); } @Override public void run() {while(true){//監(jiān)聽輸入流的輸入 try {BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));String receiveMsg = null;System.out.println();if ((receiveMsg = reader.readLine())!=null&&!(receiveMsg.equals(''))){ if (server!=null){//server.send(receiveMsg,socket.getRemoteSocketAddress());server.send(receiveMsg); }else {System.out.println(receiveMsg); }} } catch (IOException e) {e.printStackTrace(); }} }}

負責啟動的各個端口的客戶端代碼：

package netProgram;public class ClientLinked { public static void main(String[] args) {new Client().start(); }}

package netProgram;public class ClientLinked1 { public static void main(String[] args) {new Client().start(); }}

package netProgram;public class ClientLinked2 { public static void main(String[] args) {new Client().start(); }}

服務端啟動代碼在服務端類的main方法中。

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