Apache MINA NIO 连接器帮助

Question

我刚开始使用 MINA。 我有一个使用 MINA NIOconnector 连接到主机的程序。 我能够发送数据，也能够接收数据。从我在下面附上的 log4j 日志可以清楚地看出这一点。

E:\>java TC4HostClient
[12:21:46] NioProcessor-1 INFO  [] [] [org.apache.mina.filter.logging.LoggingFil
ter] - CREATED
[12:21:46] NioProcessor-1 INFO  [] [] [org.apache.mina.filter.logging.LoggingFil
ter] - OPENED
Opened
CGS Sign On
[12:21:46] NioProcessor-1 INFO  [] [] [org.apache.mina.filter.logging.LoggingFil
ter] - SENT: HeapBuffer[pos=0 lim=370 cap=512: 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20...]
[12:21:46] NioProcessor-1 INFO  [] [] [org.apache.mina.filter.logging.LoggingFil
ter] - SENT: HeapBuffer[pos=0 lim=0 cap=0: empty]
Message Sent                00000333CST   1001010        00000308000003080010000
000009600000000FTS O00000146TC4DS       001WSJTC41   ---001NTMU9001-I        ---
-----000                       0030000000012400000096500007013082015SATYA 500000
              010165070000002200011
                 01800000000022000001241   172.16.25.122   02
[12:21:46] NioProcessor-1 INFO  [] [] [org.apache.mina.filter.logging.LoggingFil
ter] - RECEIVED: HeapBuffer[pos=0 lim=36 cap=2048: 20 20 20 20 20 20 20 20 20 20
 20 20 20 20 20 20...]
[12:21:46] NioProcessor-1 INFO  [] [] [org.apache.mina.filter.logging.LoggingFil
ter] - RECEIVED: HeapBuffer[pos=0 lim=505 cap=2048: 31 20 20 20 20 20 20 20 20 3
0 30 30 30 30 34 38...]
After Writing
[12:21:52] NioProcessor-1 INFO  [] [] [org.apache.mina.filter.logging.LoggingFil
ter] - CLOSED

虽然我在日志中看到“RECEIVED”，但我的处理程序 messageReceived 方法没有被调用。 谁能在这方面帮助我并告诉我我做错了什么

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import java.net.SocketAddress;

import org.apache.mina.core.service.IoAcceptor;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketConnector;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.core.future.*;

public class TC4HostClient
{
    private static final int PORT = 9123;

    public static void main( String[] args ) throws IOException,Exception
    {
        NioSocketConnector connector = new NioSocketConnector();
        SocketAddress address = new InetSocketAddress("172.16.25.3", 8004);
        connector.getSessionConfig().setReadBufferSize( 2048 );

        connector.getFilterChain().addLast( "logger", new LoggingFilter() );
        connector.getFilterChain().addLast( "codec", new ProtocolCodecFilter( new TextLineCodecFactory( Charset.forName( "UTF-8" ))));

        connector.setHandler(new TC4HostClientHandler());
        ConnectFuture future1 = connector.connect(address);

        future1.awaitUninterruptibly();

        if (!future1.isConnected()) {
            return ;
        }
        IoSession session = future1.getSession();


        System.out.println("CGS Sign On");
        session.getConfig().setUseReadOperation(true);
        session.write("                00000333CST   1001010        00000308000003080010000000009600000000FTS O00000146TC4DS       001WSJTC41   ---001NTMU9001-I        --------000                       0030000000012400000096500007013082015SATYA 500000              010165070000002200011                                                              01800000000022000001241   172.16.25.122   02");

        session.getCloseFuture().awaitUninterruptibly();

        System.out.println("After Writing");
        connector.dispose();





    }
}

---

import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.core.buffer.IoBuffer;

public class TC4HostClientHandler extends IoHandlerAdapter
{
    @Override
    public void exceptionCaught( IoSession session, Throwable cause ) throws Exception
    {
        cause.printStackTrace();
    }
    @Override
    public void messageSent( IoSession session, Object message ) throws Exception
    {
        String str = message.toString();
        System.out.println("Message Sent" + str);
    }

    @Override
    public void messageReceived( IoSession session, Object message ) throws Exception
    {
        IoBuffer buf = (IoBuffer) message;
        // Print out read buffer content.
        while (buf.hasRemaining()) {
            System.out.print((char) buf.get());
        }
        System.out.flush();

    }
    /*
    @Override
    public void messageReceived( IoSession session, Object message ) throws Exception
    {
        String str = message.toString();
        System.out.println("Message Received : " + str);
    }*/

    @Override
    public void sessionIdle( IoSession session, IdleStatus status ) throws Exception
    {
        System.out.println( "IDLE " + session.getIdleCount( status ));
    }

    public void sessionClosed(IoSession session){
        System.out.println( "Closed ");
    }
    public void sessionOpened(IoSession session){
        System.out.println( "Opened ");
    }
}

Answer 1

我无法从您包含的日志中看出，但 TextLineCodecFactory 创建的 TextLineDecoder 将寻找（默认情况下）“\r”（0x0d）或“\n”（0x0a）来结束该行并生成完整的消息由您的 IoHandlerAdapter 处理。输入数据是否正确终止？

Answer 2

今天我第一次在 MINA 上工作，我发现残酷的现实是 MINA 上的帮助很难找到。就连它自己的网站也几乎没有。在我设法收集的一些信息（包括您的信息）的帮助下，并在提供的文档的帮助下，我设法连接、发送和接收来自服务器的响应。但令我惊讶的是，messageReceived(..) 方法没有被调用，只是日志记录证明我收到了所需的响应。日志消息采用 unicode（十六进制值）格式。没有任何异常，也没有任何迹象表明出了什么问题。我搜索了一下。然后我查看了 TextLineCodecFactory 的源代码，它看起来也很好。我查看了服务器代码，发现他们使用的是自定义编解码器。所以在我看来你的问题和我遇到的一样。确保双方的编解码器相同或至少执行相同的转换。

Answer 3

它与编解码器工厂有关。我更改为自定义编解码器，因为我们在项目中有自定义消息格式。谢谢大家的回复。