帮我用java设计一个桌面应用程序的跨进程调用

在Java中，设计一个桌面应用程序的跨进程调用通常涉及到套接字通信（Socket Programming）。下面是一个简单的步骤和示例，说明如何在一个进程中启动一个Server，而在另一个进程中作为Client连接到这个Server：

**1. Server端（进程A）：**

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

public class Server {
    private ServerSocket serverSocket;

    public static void main(String[] args) {
        try {
            Server server = new Server();
            server.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void start() throws IOException {
        serverSocket = new ServerSocket(9000); // 创建监听特定端口的ServerSocket
        while (true) { // 永远运行接收客户端请求
            Socket clientSocket = serverSocket.accept(); // 接受连接
            ClientHandler handler = new ClientHandler(clientSocket);
            handler.start(); // 用新线程处理每个连接
        }
    }

    class ClientHandler extends Thread {
        private Socket socket;

        public ClientHandler(Socket s) {
            socket = s;
        }

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

                String request = reader.readLine();
                System.out.println("Received request: " + request);

                // 这里处理请求并生成响应...
                String response = "Hello from Server!";

                writer.println(response);
                writer.flush();

                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

**2. Client端（进程B）：**

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

public class Client {
    public static void main(String[] args) {
        try {
            Client client = new Client();
            client.connectToServer("localhost", 9000); // 连接到Server地址和端口
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void connectToServer(String host, int port) throws IOException {
        Socket socket = new Socket(host, port);
        OutputStream outputStream = socket.getOutputStream();
        PrintWriter writer = new PrintWriter(outputStream, true);

        writer.println("Your message to the Server"); // 发送请求
        System.out.println("Sent message to Server");

        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String response = reader.readLine();
        System.out.println("Response from Server: " + response);

        socket.close();
    }
}

在这个例子中，进程A启动Server，接受来自进程B的消息并在接收到请求后返回响应。进程B则作为Client连接到Server，并发送消息。