Question

客户端服务器聊天系统作为服务器启动服务器和客户端连接到服务器..当客户端尝试连接到服务器时，它成功但数组失去连接条件。 catch (Exception ex) { outputTextArea.append("Lost a connection. \n"); ex.printStackTrace(); clientOutputStreams.remove(client);

无论如何要解决它？

服务器端代码

        public ClientHandler(Socket clientSocket, PrintWriter user) {
    // new inputStreamReader and then add it to a BufferedReader
                    client = user;
        try {
            sock = clientSocket;
            InputStreamReader isReader = new InputStreamReader(sock.getInputStream());
            reader = new BufferedReader(isReader);
        } // end try
        catch (Exception ex) {
            outputTextArea.append("Error beginning StreamReader. \n");
        } // end catch

    } // end ClientHandler()

    public void run() {
                    String message, connect = "Connect", disconnect = "Disconnect", chat = "Chat" ;
        String[] data;

        try {
            while ((message = reader.readLine()) != null) {

                outputTextArea.append("Received: " + message + "\n");
                data = message.split(":");
                                    for (String token:data) {

                                    outputTextArea.append(token + "..\n");

                                    }

                                    if (data[2].equals(connect)) {

                                            tellEveryone((data[0] + ":" + data[1] + ":" + chat));
                                            userAdd(data[0]);

                } else if (data[2].equals(disconnect)) {

                                        tellEveryone((data[0] + ":has disconnected." + ":" + chat));
                                        userRemove(data[0]);

                } else if (data[2].equals(chat)) {

                                        tellEveryone(message);

                } else {
                                        outputTextArea.append("No Conditions were met. \n");
                                    }


             } // end while
        } // end try
        catch (Exception ex) {
            outputTextArea.append("Lost a connection. \n");
                            ex.printStackTrace();
                            clientOutputStreams.remove(client);
        } // end catch
    } // end run()
    public void userAdd (String data) {
        String message, add = ": :Connect", done = "Server: :Done", name = data;
        outputTextArea.append("Before " + name + " added. \n");
        userlist.add(name);
        outputTextArea.append("After " + name + " added. \n");
        String[] tempList = new String[(userlist.size())];
        userlist.toArray(tempList);

            for (String token:tempList) {

                message = (token + add);
                tellEveryone(message);
            }
            tellEveryone(done);
}

public void userRemove (String data) {
            String message, add = ": :Connect", done = "Server: :Done", name = data;
            userlist.remove(name);
            String[] tempList = new String[(userlist.size())];
    userlist.toArray(tempList);

            for (String token:tempList) {

                message = (token + add);
                tellEveryone(message);
            }
            tellEveryone(done);
}

    public void tellEveryone(String message) {
// sends message to everyone connected to server
    Iterator it = clientOutputStreams.iterator();

    while (it.hasNext()) {
        try {
            PrintWriter writer = (PrintWriter) it.next();
            writer.println(message);
            writer.flush();
                            outputTextArea.setCaretPosition(outputTextArea.getDocument().getLength());

        } // end try
        catch (Exception ex) {
            outputTextArea.append("Error telling everyone. \n");
        } // end catch
    } // end while
} // end tellEveryone()

错误

java.lang.ArrayIndexOutOfBoundsException: 2
at chatsystemserver.ServerSide$ClientHandler.run(ServerSide.java:55)
at java.lang.Thread.run(Thread.java:745)

任何想法如何修复数据[2]？

Answer 1

检查数组是否至少有3个元素。也就是说，改变

if (data[2].equals(connect)) {

到

if (data.length > 2 && data[2].equals(connect)) {

如何修复java数组索引越界错误

1 个答案: