在java中通过套接字发送字符串的问题

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

public class Server {
    public static void main(String[] args) {
        try {
            // 创建ServerSocket对象，指定监听的端口号
            ServerSocket serverSocket = new ServerSocket(8888);
            
            // 等待客户端的连接请求
            Socket socket = serverSocket.accept();
            
            // 获取输入流和输出流
            InputStream inputStream = socket.getInputStream();
            OutputStream outputStream = socket.getOutputStream();
            
            // 读取客户端发送的字符串
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String message = reader.readLine();
            System.out.println("接收到客户端的消息：" + message);
            
            // 发送响应字符串给客户端
            PrintWriter writer = new PrintWriter(outputStream);
            writer.println("Hello, Client!");
            writer.flush();
            
            // 关闭连接
            socket.close();
            serverSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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

public class Client {
    public static void main(String[] args) {
        try {
            // 创建Socket对象，指定服务器的IP地址和端口号
            Socket socket = new Socket("localhost", 8888);
            
            // 获取输入流和输出流
            InputStream inputStream = socket.getInputStream();
            OutputStream outputStream = socket.getOutputStream();
            
            // 发送字符串给服务器
            PrintWriter writer = new PrintWriter(outputStream);
            writer.println("Hello, Server!");
            writer.flush();
            
            // 读取服务器的响应字符串
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String message = reader.readLine();
            System.out.println("接收到服务器的消息：" + message);
            
            // 关闭连接
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}