一个简单的Socket通信例子-蒲公英云

一个简单的Socket通信例子

叁歲伎倆 2023-06-27 06:17 44阅读 0赞

客户端与服务端交互流程

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客户端

public class Client { 
    // 服务端 host
    private static final String HOST = "127.0.0.1";
    // 服务端 port
    private static final int PORT = 8000;
    // 消息发送间隔
    private static final int SLEEP_TIME = 5000;
    public static void main(String[] args) throws IOException { 
        // 创建客户端socket
        final Socket socket = new Socket(HOST, PORT);
        new Thread(() -> { 
            System.out.println("客户端启动成功!");
            while (true) { 
                try { 
                    String message = "hello world";
                    System.out.println("客户端发送数据: " + message);
                    socket.getOutputStream().write(message.getBytes());
                } catch (Exception e) { 
                    System.out.println("写数据出错!");
                }
                // 睡眠一段时间再发送消息
                sleep();
            }
        }).start();
    }
    private static void sleep() { 
        try { 
            Thread.sleep(SLEEP_TIME);
        } catch (InterruptedException e) { 
            e.printStackTrace();
        }
    }
}

服务端

public class Server { 
    private ServerSocket serverSocket;
    public Server(int port) { 
        try { 
            // 创建服务端 socket 对象
            this.serverSocket = new ServerSocket(port);
            System.out.println("服务端启动成功！端口:" + port);
        } catch (IOException e) { 
            e.printStackTrace();
        }
    }
    public void start() { 
        // 新建子线程处理请求（不阻塞主线程）
        new Thread(() -> doStart()).start();
    }
    private void doStart() { 
        while (true) { 
            try { 
                // 监听消息，没有消息时会阻塞
                Socket client = serverSocket.accept();
                // 消息处理
                new ClientHandler(client).start();
            } catch (IOException e) { 
                e.printStackTrace();
            }
        }
    }
}

服务端处理消息的逻辑

public class ClientHandler { 
    private static final int MAX_DATA_LEN = 1024;
    private Socket socket;
    public ClientHandler(Socket socket) { 
        this.socket = socket;
    }
    public void start() { 
        System.out.println("新客户端接入");
        // 创建子线程接收新客户端的消息
        new Thread(()-> doStart()).start();
    }
    private void doStart() { 
        try { 
            // 读取消息流
            InputStream inputStream = socket.getInputStream();
            while (true) { 
                byte[] data = new byte[MAX_DATA_LEN];
                int len;
                while((len = inputStream.read(data)) != -1) { 
                    String message = new String(data, 0, len);
                    System.out.println("客户端传来的消息：" + message);
                    // 将数据回传客户端
                    socket.getOutputStream().write(data);
                }
            }
        } catch (IOException e) { 
            e.printStackTrace();
        }
    }
}

服务端启动逻辑

public class ServerBoot { 
    private static final int PORT = 8000;
    public static void main(String[] args) { 
        Server server = new Server(PORT);
        server.start();
    }
}

结果验证

先启动服务端，再启动客户端，在控制台上可以看到打印的结果。
服务端控制台：
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客户端控制台：