Netty基本组件-蒲公英云

Netty基本组件

忘是亡心i 2022-12-28 12:57 278阅读 0赞

1 Netty是什么

异步事件驱动框架，用于快速开发高性能服务端和客户端
封装了JDK底层BIO和NIO模型，提供高度可用的API
自带编解码器解决拆包粘包问题，用户只用关心业务逻辑
精心设计的reactor线程模型支持高并发海量连接
自带各种协议栈让你处理任何一种通信协议都几乎不用亲自动手

2 一个简单的socket例子

这是一个简单I/O的例子

/** * Server端启动类 * @author mazhen */
public class ServerBoot { 
    private static final int PORT = 10000;
    public static void main(String[] args) { 
        Server server = new Server(PORT);
        server.start();
    }
}
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class Server { 
    private ServerSocket serverSocket;
    public Server(int port) { 
        try { 
            this.serverSocket = new ServerSocket(port);
            System.out.println("服务端启动成功，端口:" + port);
        } catch (IOException exception) { 
            System.out.println("服务端启动失败");
        }
    }
    public void start() { 
        doStart();
        System.out.println("无法执行到我?");
    }
    private void doStart() { 
        while (true) { 
            try { 
                //serverSocket获取客户端的请求并获取客户端Socket
                Socket client = serverSocket.accept();
                new ClientHandler(client).start();
            } catch (IOException e) { 
                System.out.println("服务端异常");
            }
        }
    }
}
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
public class ClientHandler { 
    public static final int MAX_DATA_LEN = 1024;
    private final Socket socket;
    public ClientHandler(Socket socket) { 
        this.socket = socket;
    }
    public void start() { 
        System.out.println("新客户端接入");
        //启动一个线程，读取Socket中的输入流
        new Thread(this::doStart).start();
    }
    private void doStart() { 
        try { 
            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("客户端传来消息: " + message);
                }
            }
        } catch (IOException e) { 
            e.printStackTrace();
        }
    }
}
import java.io.IOException;
import java.net.Socket;
/** * @author 闪电侠 */
public class Client { 
    private static final String HOST = "127.0.0.1";
    private static final int PORT = 10000;
    private static final int SLEEP_TIME = 5000;
    public static void main(String[] args) throws IOException { 
        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!");
                }
                sleep();
            }
        }).start();
    }
    private static void sleep() { 
        try { 
            Thread.sleep(SLEEP_TIME);
        } catch (InterruptedException e) { 
            e.printStackTrace();
        }
    }
}