How does Java network programming interact with other languages ​​such as Python?

Java network programming can interact with applications written in other languages, such as Python. This article shows the steps for interaction between Java and Python: Java creates a server and listens on a specific port. Python creates a client that connects to the IP address and port of the Java server. Python sends data to Java, and Java processes and sends a response to Python.

Java network programming interacts with other languages

Java network programming can not only communicate with other Java applications; Language (such as Python) to interact with applications written in. This article will show how to use Java network programming to interact with Python and provide a practical case.

1. Create Java server

import java.net.ServerSocket;
import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;

public class JavaServer {

    public static void main(String[] args) throws Exception {
        // 创建服务端套接字，监听端口 5000
        ServerSocket serverSocket = new ServerSocket(5000);

        // 接受客户端连接，并创建套接字
        Socket socket = serverSocket.accept();

        // 获取输入流和输出流
        InputStream inputStream = socket.getInputStream();
        OutputStream outputStream = socket.getOutputStream();

        // 读取客户端发送的数据
        byte[] buffer = new byte[1024];
        int length = inputStream.read(buffer);
        String message = new String(buffer, 0, length);

        // 处理来自客户端的数据
        // ...

        // 向客户端发送数据
        String response = "已收到来自 Python 客户端的数据";
        outputStream.write(response.getBytes());

        // 关闭套接字和服务端套接字
        socket.close();
        serverSocket.close();
    }
}

2. Create Python client

import socket

# 创建客户端套接字，连接到 Java 服务端的 IP 地址和端口
clientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
clientSocket.connect(('127.0.0.1', 5000))

# 发送数据到 Java 服务端
message = "这是来自 Python 客户端的数据"
clientSocket.send(message.encode())

# 接收来自 Java 服务端的数据
response = clientSocket.recv(1024)
print(response.decode())

# 关闭客户端套接字
clientSocket.close()

Practical case: File transfer

The following code shows a practical case of file transfer implemented using Java and Python:

Java server side:

// ... 同 JavaServer 代码 ...

// 接收文件内容
byte[] fileContent = new byte[1024];
int totalLength = 0;
while ((length = inputStream.read(fileContent)) != -1) {
    totalLength += length;
}

// ... 同 JavaServer 代码 ...

Python client:

# ... 同 PythonClient 代码 ...
with open('test.txt', 'rb') as f:
    fileContent = f.read()
clientSocket.send(fileContent)

# ... 同 PythonClient 代码 ...

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