JAVA實現SOCKET多客戶端通信的案例

一、ServerSocket

1.為了方便調試，先創建一個界面用于顯示客戶端連接信息

基于javafx包寫的一個簡單界面！

javafx.scene.control.TextArea ta = new javafx.scene.control.TextArea(); @Override public void start(Stage primaryStage) throws Exception { scene = new Scene(ta,450,200); primaryStage.setTitle('SocketServer'); primaryStage.setScene(scene); primaryStage.show(); pStage = primaryStage; new Thread(new MyServer()).start(); //創建線程啟動Socket服務 }

2.啟動Socket服務

public class MyServer implements Runnable{ @Override public void run() { try{ java.net.ServerSocket serverSocket = new java.net.ServerSocket(8000); ta.appendText('Server started at ' + new Date()+'n'); while(true){ Socket socket = serverSocket.accept(); //程序會在這里阻塞，直到等到客戶端連接 clientNumber++; /* 這里就是在界面中輸出一些服務器、和連接的客戶端信息 */ Platform.runLater(()->{ ta.appendText('Starting thread for client ' + clientNumber + ' at ' +new Date() +'n'); InetAddress inetAddress = socket.getInetAddress(); ta.appendText('Client '+clientNumber + '’s host name is' +inetAddress.getHostName() +'n'); ta.appendText('Client'+clientNumber + '’s IP address is '+ inetAddress.getHostAddress()+'n'); }); /* 每有一個客戶端連接服務器就創建一個線程，進行通信處理 */ new Thread(new HandleServer(socket)).start(); try{ Thread.sleep(100); //多個客戶端連續快速連接服務器時，可能出現問題，這里設置延時 }catch (InterruptedException e){ e.printStackTrace(); } } }catch (IOException e){ e.printStackTrace(); } } }

這一段代碼主要作用就是循環等待客戶端連接服務器：

Socket socket = serverSocket.accept();

在寫這篇博客時，突然想知道阻塞的原理就去查了一下。。。。

然而并沒有看懂。。這個應該涉及到操作系統層面，等之后把操作系統搞明白了在來補充吧。

3.服務器處理類HandleServer

class HandleServer implements Runnable { private Socket socket; private int name; private int toClientID; private DataOutputStream outputStream; private DataInputStream inputStream; public HandleServer(Socket socket){ this.socket = socket; ServerTools.Tools().add(this); this.name = clientNumber; } @Override public void run() { try{ inputStream = new DataInputStream(socket.getInputStream()); outputStream = new DataOutputStream(socket.getOutputStream()); outputStream.writeUTF('Your ID is:'+clientNumber); while (true){ toClientID = inputStream.readInt(); String messageGET = inputStream.readUTF(); int err = ServerTools.Tools().MyWriteUTF(messageGET,toClientID); //MyWriteUTF 是一個自定義方法，serverTools.Tools()是一個工具類，一個靜態對象。 if (err==0){ outputStream.writeUTF('No have this ID!'); } Platform.runLater(()->{ ta.appendText(socket.getInetAddress().getHostName()+' Message received from client:' + messageGET +'n' ); }); System.out.println(clientNumber); } }catch (IOException e){ clientNumber--; System.out.println(clientNumber); System.err.println('Client is closed!'); } }

這一塊的代碼主要就是創建輸入輸出數據流了

inputStream = new DataInputStream(socket.getInputStream());

outputStream = new DataOutputStream(socket.getOutputStream());

4.一些方法方便ServerTools類實現

public void MyWriteUTF(String message){ try { outputStream.writeUTF(message); } catch (IOException e) { ServerTools.Tools().remove(this); e.printStackTrace(); } } public int getName() { return name; }

二、ServerTools

1.實現指定服務器ID輸出信息的工具

public class ServerTools { private static final ServerTools servertools = new ServerTools(); public static ServerTools Tools(){ return servertools; } Vector<MyServerSocket.HandleServer> vector = new Vector<MyServerSocket.HandleServer>(); public void add(MyServerSocket.HandleServer cs){ vector.add(cs); } public void remove(MyServerSocket.HandleServer cs){ vector.remove(cs); } public int MyWriteUTF(String message,int target) { for (int i = 0; i <= target; i++){ try { if (vector.get(i).getName() == target) { MyServerSocket.HandleServer MSSHC = vector.get(i); MSSHC.MyWriteUTF(message); return 1; } }catch (ArrayIndexOutOfBoundsException e){ e.printStackTrace(); return 0; } } return 0; }}

vector用于保存客戶端連接信息

一個粗糙的處理方式，邏輯上缺陷還很嚴重，主要我好像沒找到這樣的框架？？？

缺陷：因為服務器要返回客戶端的ID讓客戶端將ID顯示到交互界面，所以存在情況客戶端多次連接斷開后會使返回的ID出現重復

三、ClientSocket

1.同樣的先建一個簡單的界面用于輸出信息和顯示信息

第一個編輯框就是 輸入要發送指定客戶端的ID 例如：1 或 2 這樣的？？？

第二個編輯框就是 輸入你要發送的信息了，很清楚

下面的就是顯示框，嗯！

public class MyClientSocket extends Application { private Socket socket; private DataOutputStream toServer = null; private DataInputStream fromServer = null; private String ID; private int targetID = 0; private TextArea ta; @Override public void start(Stage primaryStage) throws Exception { BorderPane paneForTextField = new BorderPane(); paneForTextField.setPadding(new Insets(5,5,5,5)); paneForTextField.setStyle('-fx-border-color: green'); paneForTextField.setLeft(new Label('Enter a Message:')); TextField tf = new TextField(); tf.setAlignment(Pos.BOTTOM_RIGHT); paneForTextField.setCenter(tf); BorderPane ID_lable = new BorderPane(); ID_lable.setPadding(new Insets(5,5,5,5)); ID_lable.setStyle('-fx-border-color: green'); ID_lable.setLeft(new Label('Enter a ID for send message:')); TextField getId = new TextField(); getId.setAlignment(Pos.BOTTOM_RIGHT); ID_lable.setCenter(getId); paneForTextField.setTop(ID_lable); BorderPane mainPane = new BorderPane(); ta = new TextArea(); mainPane.setCenter(new ScrollPane(ta)); mainPane.setTop(paneForTextField); Scene scene = new Scene(mainPane,450,200); primaryStage.setTitle('SocketClient'); primaryStage.setScene(scene); primaryStage.show(); tf.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { targetID = Integer.parseInt(getId.getText().trim()); if (targetID > 0 || targetID!=Integer.parseInt(ID)); else return; try { String putMessage = tf.getText().trim(); toServer.writeInt(targetID); toServer.writeUTF(putMessage); toServer.flush(); ta.appendText('PUT message is :'+ putMessage +'n'); tf.setText(''); }catch (IOException ex ){ System.err.println(ex); } } }); try{ socket = new Socket('localhost',8000); fromServer = new DataInputStream(socket.getInputStream()); toServer = new DataOutputStream(socket.getOutputStream()); ID = fromServer.readUTF(); paneForTextField.setRight(new Label('Your ID is:'+ID)); new Thread(new getMessage(socket,fromServer)).start(); }catch (IOException ex){ ta.appendText(ex.toString() +'n'); } }}

一樣的要new一個Socket 去連接服務器，socket()，括號里的就是服務器的IP，和程序的端口號了，這種基于tcp協議的好像都是一個樣？？？

2.創建一個線程用于循環獲取信息并顯示

class getMessage implements Runnable{ private Socket socket; private DataInputStream formServer; public getMessage(Socket socket,DataInputStream formServer){ this.socket = socket; this.formServer = formServer; } @Override public void run() { try { while (true) { String Message = formServer.readUTF(); try{ Thread.sleep(100); }catch (InterruptedException e) { e.printStackTrace(); } ta.appendText('GET message from server is:' + Message + 'n'); } }catch (IOException e){ System.err.println(e); } } }

很簡單了，依舊是輸入輸出數據流，然后循環等待信息并輸出。

3.新建一個TestClient類 這個類 和ClientSocket 一模一樣 就是拿來測試的

四、總結

java寫socket 是真的簡單！??！^_ ^!

以上這篇JAVA實現SOCKET多客戶端通信的案例就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持好吧啦網。