下面的程序为利用Socket实现客户端和服务端通信，请填空把程序补充完整。 //服务器端（ServerTest.java文件清单：） import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; class Server

Test{
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = new ServerSocket(8888);
System.out.println("服务器已启动，等待客户端连接...");
Socket socket = serverSocket.accept();
System.out.println("客户端已连接，客户端信息如下：" + socket);
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter writer = new PrintWriter(socket.getOutputStream(), true);
while (true) {
String message = reader.readLine();
if (message == null) {
break;
}
System.out.println("客户端发送的消息是：" + message);
writer.println("已收到消息：" + message);
}
reader.close();
writer.close();
socket.close();
serverSocket.close();
}
}

// 客户端（ClientTest.java文件清单：）
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

class ClientTest {
public static void main(String[] args) throws UnknownHostException, IOException {
Socket socket = new Socket("localhost", 8888);
System.out.println("已连接服务器，服务器信息如下：" + socket);
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter writer = new PrintWriter(socket.getOutputStream(), true);
BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
while (true) {
String message = console.readLine();
writer.println(message);
String response = reader.readLine();
System.out.println("收到服务器的回复：" + response);
}
}
}