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java socket如何运行

2026-03-04 04:21:12Java

Java Socket 的基本运行方法

Java Socket 编程基于客户端-服务器模型，通过 java.net 包中的 Socket 和 ServerSocket 类实现。以下是实现简单通信的代码示例和说明。

服务器端代码

服务器端使用 ServerSocket 监听指定端口，等待客户端连接：

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

public class Server {
    public static void main(String[] args) throws IOException {
        int port = 12345;
        ServerSocket serverSocket = new ServerSocket(port);
        System.out.println("服务器启动，等待客户端连接...");

        Socket clientSocket = serverSocket.accept();
        System.out.println("客户端已连接");

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

        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            System.out.println("收到客户端消息: " + inputLine);
            out.println("服务器回复: " + inputLine);
        }

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

客户端代码

客户端通过 Socket 连接到服务器并发送消息：

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

public class Client {
    public static void main(String[] args) throws IOException {
        String host = "localhost";
        int port = 12345;

        Socket socket = new Socket(host, port);
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(
            new InputStreamReader(socket.getInputStream())
        );
        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));

        String userInput;
        while ((userInput = stdIn.readLine()) != null) {
            out.println(userInput);
            System.out.println("服务器回复: " + in.readLine());
        }

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