Mina Tcp Socket服务端的实现

1.引入依赖

<!-- https://mvnrepository.com/artifact/org.apache.mina/mina-core -->

<dependency>

        <groupId>org.apache.mina</groupId>

        <artifactId>mina-core</artifactId>

        <version>2.0.7</version>

</dependency>

2.创建服务端

IoAcceptor acceptor = new NioSocketAcceptor();
TextLineCodecFactory factory = new TextLineCodecFactory(Charset.forName("UTF-8"));
factory.setDecoderMaxLineLength(Integer.MAX_VALUE);
acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(factory));
acceptor.getSessionConfig().setReadBufferSize(20480);
acceptor.getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, 100);
acceptor.getFilterChain().addLast("threadPool", new ExecutorFilter(Executors.newCachedThreadPool()));
acceptor.setHandler(new DockHandler());
acceptor.bind(new InetSocketAddress(port));
log.info("=== TCP Server start on port " + port);

消息处理器IoHandlerAdapter实现类：

@Slf4j
public class DockHandler extends IoHandlerAdapter
{

    @Override
    public void messageReceived(IoSession session, Object message)
        throws Exception
    {
        super.messageReceived(session, message);
        String msg = (String)message;
        log.info("收到消息：" + msg);
        sockerHandlerService.dockSocketMessage(msg);
    }
    
    @Override
    public void sessionCreated(IoSession session)
        throws Exception
    {
        super.sessionCreated(session);
        log.info("创建连接");
    }

    @Override
    public void sessionOpened(IoSession session)
        throws Exception
    {
        super.sessionOpened(session);
        log.info("建立连接");
    }

    @Override
    public void sessionClosed(IoSession session)
        throws Exception
    {
        super.sessionClosed(session);
        log.info("连接关闭");
    }

    @Override
    public void sessionIdle(IoSession session, IdleStatus status)
        throws Exception
    {
        super.sessionIdle(session, status);
        log.info("重新连接");
    }

    @Override
    public void exceptionCaught(IoSession session, Throwable cause)
        throws Exception
    {
        super.exceptionCaught(session, cause);
        log.info("会话异常！");
        if (session != null)
        {
            session.closeNow();
        }
    }

    @Override
    public void messageSent(IoSession session, Object message)
        throws Exception
    {
        super.messageSent(session, message);
    }

    @Override
    public void inputClosed(IoSession session)
        throws Exception
    {
        super.inputClosed(session);
    }
    
}

本文使用的Mina自带的基于文本的编解码器TextLineCodecFactory，根据回车换行（windows下是\r\n，linux下是\r）来断点传输数据，且在解码器中解决了半包粘包问题。

客户端程序参考另一篇：https://blog.csdn.net/qq_34928194/article/details/106387499

自定义编解码器：一个来自未来博文的url：Mina自定义解码器，解决半包粘包问题