How to configure and use sockets in Java network programming?-javaTutorial-php.cn

Socket is the foundation of network programming, allowing applications to communicate with each other over the network. This guide provides detailed steps on how to configure and use Socket: Create a Socket: Specify the port and address. Using sockets: the server listens for connections, reads and writes data; the client connects to the server, sends and receives data. Practical case: Build a simple chat application to demonstrate how to use Socket for two-way communication.

How to configure and use sockets in Java network programming?

Java Network Programming: Socket Configuration and Usage Guide

Socket (Socket) is the basis of network programming and allows applications Programs communicate with each other over a network. This guide explains how to configure and use sockets in Java.

Configuring the socket

The steps to create a socket are as follows:

// 创建一个 ServerSocket 监听端口 8080 ServerSocket serverSocket = new ServerSocket(8080); // 创建一个 Socket 客户端连接到 localhost:8080 Socket clientSocket = new Socket("localhost", 8080);

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Using the socket

Server side:

// 接受客户端连接 Socket clientSocket = serverSocket.accept(); // 获取输入流和输出流 DataInputStream input = new DataInputStream(clientSocket.getInputStream()); DataOutputStream output = new DataOutputStream(clientSocket.getOutputStream()); // 读写数据 String message = input.readUTF(); output.writeUTF("Hello from server: " + message); // 关闭连接 clientSocket.close();

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Client side:

// 发送数据到服务器 DataOutputStream output = new DataOutputStream(clientSocket.getOutputStream()); output.writeUTF("Hello from client"); // 接收服务器响应 DataInputStream input = new DataInputStream(clientSocket.getInputStream()); String serverMessage = input.readUTF(); // 关闭连接 clientSocket.close();

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Actual case

Build a simple chat application:

Server code:

ServerSocket serverSocket = new ServerSocket(8080); Socket clientSocket = serverSocket.accept(); BufferedReader input = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); PrintWriter output = new PrintWriter(clientSocket.getOutputStream(), true); while (true) { String message = input.readLine(); if (message == null || message.isEmpty()) { break; } output.println("Server: " + message); }

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Client code:

Socket clientSocket = new Socket("localhost", 8080); BufferedReader input = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); PrintWriter output = new PrintWriter(clientSocket.getOutputStream(), true); output.println("Hello from client"); String serverMessage = input.readLine(); System.out.println(serverMessage);

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