java设计基于流套接字的客户端/服务器通信程序。要求如下： （1）分别编写服务端程序和客户端程序（端口号为1888）。 （2）客户端向服务器发送信息，服务器接收信息并显示。 （3）同时，服务器将信息反馈给客户端，客户端接收信息并显示

好的，我可以为你提供一个基于流套接字的Java客户端/服务器通信程序示例。以下是服务端程序的代码：

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

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(1888);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 1888.");
            System.exit(1);
        }

        Socket clientSocket = null;
        try {
            System.out.println("Waiting for client...");
            clientSocket = serverSocket.accept();
            System.out.println("Client connected: " + clientSocket.getInetAddress().getHostName());
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }

        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));

        String inputLine, outputLine;
        while ((inputLine = in.readLine()) != null) {
            System.out.println("Client: " + inputLine);
            outputLine = inputLine;
            out.println(outputLine);
        }

        out.close();
        in.close();
        stdIn.close();
        clientSocket.close();
        serverSocket.close();
    }
}

以下是客户端程序的代码：

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

public class Client {
    public static void main(String[] args) throws IOException {
        Socket socket = null;
        PrintWriter out = null;
        BufferedReader in = null;

        try {
            socket = new Socket("localhost", 1888);
            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Unknown host: localhost");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Could not connect to localhost:1888");
            System.exit(1);
        }

        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
        String userInput;
        while ((userInput = stdIn.readLine()) != null) {
            out.println(userInput);
            System.out.println("Server: " + in.readLine());
        }

        out.close();
        in.close();
        stdIn.close();
        socket.close();
    }
}

这个程序运行后，你可以在客户端输入一些文本，然后将其发送到服务器。服务器将显示客户端发送的信息，并将其发送回客户端。客户端将显示服务器发送的信息。