java代码个人聊天室 要求： 1. 可使用文字聊天 2. 可以发送文件 3. 可以私聊

好的，这是一个很有趣的项目！首先，你需要学习如何使用Java Socket编程来实现客户端和服务器端之间的通信。以下是一个简单的代码示例，可以让你了解如何建立Socket连接和发送/接收消息。

服务器端代码：

import java.io.*;
import java.net.*;

public class Server {
    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(8000)) {
            System.out.println("Server started.");

            while (true) {
                Socket socket = serverSocket.accept();
                System.out.println("Client connected: " + socket);

                // Start a new thread to handle the client
                Thread thread = new Thread(new ClientHandler(socket));
                thread.start();
            }
        } catch (IOException e) {
            System.err.println("Server error: " + e.getMessage());
        }
    }
}

class ClientHandler implements Runnable {
    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;

    public ClientHandler(Socket socket) {
        this.socket = socket;
    }

    @Override
    public void run() {
        try {
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);

            String message;
            while ((message = in.readLine()) != null) {
                System.out.println("Message received: " + message);

                // Send the message back to the client
                out.println(message);
            }
        } catch (IOException e) {
            System.err.println("Client error: " + e.getMessage());
        } finally {
            try {
                socket.close();
            } catch (IOException e) {
                System.err.println("Socket not closed: " + e.getMessage());
            }
        }
    }
}

客户端代码：

import java.io.*;
import java.net.*;

public class Client {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 8000)) {
            System.out.println("Connected to server.");

            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

            // Read from the console and send to the server
            BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
            String message;
            while ((message = console.readLine()) != null) {
                out.println(message);

                // Receive the message from the server and print it to the console
                String response = in.readLine();
                System.out.println("Server response: " + response);
            }
        } catch (IOException e) {
            System.err.println("Client error: " + e.getMessage());
        }
    }
}

以上代码仅作为示例，可以帮助你了解如何使用Java Socket编程来实现基本的文本通信。如果你要实现文件传输和私聊等功能，需要在这个基础上进行进一步的开发和改进。