我正在嘗試創建一個聊天程序，其中客戶端向服務器發送消息，然后服務器將該消息發送到所有連接的客戶端以顯示它。該程序可以工作，但是當客戶端發送消息時，只有它會收到返回的消息，而其余連接的客戶端則不會收到任何信息?？蛻舳舜a：public class Client { protected static JTextArea textArea = new JTextArea(20, 30); protected static String sendMSG, getMSG; public static void main(String[] args) throws IOException { String hostName = args[0]; String Username = args[1]; boolean sending = true; try ( Socket socket = new Socket(hostName, 1010); PrintWriter out = new PrintWriter(socket.getOutputStream(), true); BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); ) { BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in)); //frame setup JFrame frame = new JFrame("chat client"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //text area JScrollPane scrollPane = new JScrollPane(textArea); //text field JTextField MSGText = new JTextField(5); //"send" button JButton sMSGB = new JButton("send"); sMSGB.setPreferredSize(new Dimension(60, 30)); sMSGB.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { sendMSG = MSGText.getText(); MSGText.setText(""); out.println("<" + Username + ">: " + sendMSG); } }); //panel JPanel p = new JPanel(); p.setLayout((new BoxLayout(p, BoxLayout.PAGE_AXIS))); p.add(Box.createVerticalStrut(5)); p.add(scrollPane); p.add(Box.createVerticalStrut(5)); p.add(MSGText); p.add(Box.createVerticalStrut(5)); p.add(sMSGB); p.add(Box.createVerticalStrut(5)); frame.getContentPane().add(p); } } } } }
1 回答
白豬掌柜的
TA貢獻1893條經驗 獲得超10個贊
非常簡單的決定創建一個像列表一樣的 PrintWriter 持有者。不要忘記為此系列創建關閉機制！并考慮多線程。
public class ServerThread extends Thread {
private final Socket socket;
private final List<PrintWriter> outs;
public ServerThread(Socket socket, List<PrintWriter> outs) {
super("ServerThread");
this.socket = socket;
this.outs = outs;
System.out.println("Opened outs: " + outs.size());
}
private void sendToAll(String msg) throws IOException {
for(PrintWriter out: outs) {
out.println(msg);
}
}
public void run() {
try (
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
) {
System.out.println("stream opened");
outs.add(out);
String getMSGs;
while((getMSGs = in.readLine()) != null) {
System.out.println("msg received and sent " + getMSGs);
sendToAll(getMSGs);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
如果它是一個大項目，最好為消息創建隊列
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