网络编程问题：如何在Java中实现TCP客户端和服务器？

原创超、凢脫俗 2024-10-08 03:24 86阅读 0赞

在Java中，我们可以使用Socket类来实现TCP客户端和服务器。以下是两种情况的简单示例：

1. TCP客户端（向服务器发送数据）：
```java
import java.io.*;
import java.net.*;

public class Client {
    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 1234)); 
        {   
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())));   
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())));

// 获取并打印服务器的消息
            String serverMessage = in.readLine();
            System.out.println("Received from Server: " + serverMessage);

// 发送消息给服务器
            out.write("Hello, Server! \n");
            out.flush();

// 等待并打印从服务器的回显
            serverMessage = in.readLine();
            System.out.println("Received from Server: " + serverMessage);
        }
    }
}
```
2. TCP服务器（向客户端发送数据）：
```java
import java.io.*;
import java.net.*;

public class Server {
    public static void main(String[] args) throws IOException {
        try (ServerSocket socket = new ServerSocket(1234)); 
        {   
            System.out.println("Server is listening on port 1234...");

while (true) {
                Socket clientSocket = socket.accept();

try (BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))),
                         (PrintWriter out = new PrintWriter(new OutputStreamWriter(clientSocket.getOutputStream())))) {

String clientMessage = in.readLine();
                    System.out.println("Received from Client: " + clientMessage);

out.write("Hello, Client! \n");
                    out.flush();

} catch (IOException e) {
                    System.err.println(e.getMessage());
                }
            }
        }
    }
}
```
请注意，这里提供的示例代码没有实际运行，你需要根据环境和需求进行修改。