Mina 编写自己的编码解码FilterChain(codec)

mina 自己带的FilterChain codec是非常好用，但是在实际网络应用中还是有他的局限性，如编写基于CMPP、SGIP的短信系统。 

下面我编写的一个自己FilterChain例子，方便以后查看和其他的人查阅（哎，网上的mina资料少的可怜） 

1.mina服务器类 

package Minatest; import java.net.InetSocketAddress; import org.apache.mina.common.DefaultIoFilterChainBuilder; import org.apache.mina.common.IdleStatus; import org.apache.mina.common.IoAcceptor; import org.apache.mina.common.IoAcceptorConfig; import org.apache.mina.common.IoHandler; import org.apache.mina.common.IoSession; import org.apache.mina.filter.LoggingFilter; import org.apache.mina.filter.codec.ProtocolCodecFilter; import org.apache.mina.transport.socket.nio.SocketAcceptor; import org.apache.mina.transport.socket.nio.SocketAcceptorConfig; public class MinaServer { /** * @param args * @throws Exception * zxp * */ public static void main(String[] args) throws Exception {    IoAcceptor acceptor=new SocketAcceptor();    IoAcceptorConfig config=new SocketAcceptorConfig();    //config.setDisconnectOnUnbind(true);    DefaultIoFilterChainBuilder d= config.getFilterChain();    //d.addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory( Charset.forName("UTF-8"))));    //d.addFirst("a", );    InetSocketAddress address=new InetSocketAddress(9000);    acceptor.bind(address, new MinaServer().new server(), config);   } public class server implements IoHandler {    public void exceptionCaught(IoSession arg0, Throwable arg1) throws Exception {     // TODO Auto-generated method stub     System.out.println("异常:"+arg1);     arg1.fillInStackTrace();    }    public void messageReceived(IoSession arg0, Object arg1) throws Exception {     // TODO Auto-generated method stub     System.out.println("收到信息");     SendMessages send=(SendMessages)arg1;     System.out.println(send.msg);     //收到客户端的消息 为0表示刚刚发送的测试消息发送成功 （这个流程是针对CMPP协议，对于普通的来说没意义）     if(send.msg.equals("0")){      this.sessionClosed(arg0);     }          }         //信息发送成功后触发的事件    public void messageSent(IoSession arg0, Object arg1) throws Exception {     // TODO Auto-generated method stub     System.out.println("发送信息");    }    public void sessionClosed(IoSession arg0) throws Exception {     // TODO Auto-generated method stub     System.out.println("session 关闭");     arg0.close();    }    public void sessionCreated(IoSession arg0) throws Exception {     // TODO Auto-generated method stub     System.out.println("session 建立");    }    public void sessionIdle(IoSession arg0, IdleStatus arg1) throws Exception {     // TODO Auto-generated method stub     System.out.println("session 空闲");     if(arg1==IdleStatus.BOTH_IDLE){ //     //自定义发送类 //     SendMessages send= new SendMessages(); //     send.setMsg("Hi!客户端你空闲咯！"); //     this.sendMessage(arg0, send);     }    }    public void sessionOpened(IoSession arg0) throws Exception {     // TODO Auto-generated method stub     System.out.println("session 打开");        //arg0.setIdleTime(IdleStatus.BOTH_IDLE, 10);     arg0.getFilterChain().addFirst("a", new ProtocolCodecFilter(new TestProtocolCodecFactory()));     arg0.getFilterChain().addLast("logger", new LoggingFilter());        //发送条测试消息     SendMessages send= new SendMessages();     send.setMsg("Hi!客户端你好！");     this.sendMessage(arg0, send);       }      private void sendMessage(IoSession arg0, Object arg1){     arg0.write(arg1);    } } } 

2.mina客户端类 

package Minatest; import java.net.InetSocketAddress; import java.nio.charset.Charset; import org.apache.mina.common.DefaultIoFilterChainBuilder; import org.apache.mina.common.IdleStatus; import org.apache.mina.common.IoConnector; import org.apache.mina.common.IoConnectorConfig; import org.apache.mina.common.IoHandler; import org.apache.mina.common.IoSession; import org.apache.mina.filter.codec.ProtocolCodecFactory; import org.apache.mina.filter.codec.ProtocolCodecFilter; import org.apache.mina.filter.codec.textline.TextLineCodecFactory; import org.apache.mina.transport.socket.nio.SocketConnector; import org.apache.mina.transport.socket.nio.SocketConnectorConfig; public class MinaClient { /** * @param args * zxp * */ public static void main(String[] args) {    // TODO Auto-generated method stub        IoConnector connector=new SocketConnector();        IoConnectorConfig config=new SocketConnectorConfig();       //config.setConnectTimeout(1);        //DefaultIoFilterChainBuilder d= config.getFilterChain();        //d.addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8"))));        InetSocketAddress address=new InetSocketAddress("127.0.0.1",9000);        connector.connect(address, new MinaClient().new client(), config);        }    public class client implements IoHandler{ public void exceptionCaught(IoSession arg0, Throwable arg1) throws Exception {    // TODO Auto-generated method stub    System.out.println("客户端异常:"+arg1);    arg0.close(); } public void messageReceived(IoSession arg0, Object arg1) throws Exception {    // TODO Auto-generated method stub    System.out.println("客户端收到消息");    SendMessages send=(SendMessages) arg1;    System.out.println(send.getMsg());    if(send.msg!=null){     send.setMsg("0");     this.sendMessages(arg0,send);    } } public void messageSent(IoSession arg0, Object arg1) throws Exception {    // TODO Auto-generated method stub        //不能用这个方法发送信息，要不死循环    //arg0.getw } public void sessionClosed(IoSession arg0) throws Exception {    // TODO Auto-generated method stub    System.out.println("客户端关闭");    arg0.close(); } public void sessionCreated(IoSession arg0) throws Exception {    // TODO Auto-generated method stub    System.out.println("客户端建立");    //arg0.getFilterChain() } public void sessionIdle(IoSession arg0, IdleStatus arg1) throws Exception {    // TODO Auto-generated method stub    System.out.println("客户端空闲");    if(arg1==IdleStatus.BOTH_IDLE){     this.messageSent(arg0, "空闲测试");     SendMessages send=new SendMessages();     send.setMsg("aaaaa");     this.sendMessages(arg0, send);    } } public void sessionOpened(IoSession arg0) throws Exception {    // TODO Auto-generated method stub    System.out.println("客户端打开");    //10秒内没有读写就设置为空闲通道    arg0.setIdleTime(IdleStatus.BOTH_IDLE, 10);      //自定义包解析      //ProtocolCodecFactory codec=new TestProtocolCodecFactory();    //arg0.getFilterChain().addFirst("test", new ProtocolCodecFilter(codec));      arg0.getFilterChain().addLast("a", new ProtocolCodecFilter(new TestProtocolCodecFactory())); }     private void sendMessages(IoSession arg0, Object arg1){    System.out.println("sendMessages 发送");    arg0.write(arg1); }    } } 

3.工厂类 

package Minatest; import org.apache.mina.filter.codec.demux.DemuxingProtocolCodecFactory; public class TestProtocolCodecFactory extends DemuxingProtocolCodecFactory {    public TestProtocolCodecFactory(){     super.register(TestDecoder.class);     super.register(TestEncoder.class);    } } 

4.编码类

package Minatest; import java.util.Collections; import java.util.HashSet; import java.util.Hashtable; import java.util.Set; import org.apache.mina.common.ByteBuffer; import org.apache.mina.common.IoSession; import org.apache.mina.filter.codec.ProtocolEncoderOutput; import org.apache.mina.filter.codec.demux.MessageEncoder; public class TestEncoder implements MessageEncoder { /** * 编码消息 * zxp * */ public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception {    SendMessages msg=(SendMessages)message;    ByteBuffer b=ByteBuffer.allocate(msg.getmsgleng());    b.setAutoExpand(true);    //编码消息    msg.encoder(b);    //b.putInt(97);    //b.put("a".getBytes());    b.flip();    out.write(b); } /** * 获取编码自定义消息类型(多个) * */ public Set<Class<?>> getMessageTypes() {    Set<Class<?>> set=new HashSet<Class<?>>();    set.add(SendMessages.class);    //返回指定映射的不可修改视图 即只读    return Collections.unmodifiableSet(set); } } 

5.解码类 

package Minatest; import org.apache.mina.common.ByteBuffer; import org.apache.mina.common.IoSession; import org.apache.mina.filter.codec.ProtocolDecoderOutput; import org.apache.mina.filter.codec.demux.MessageDecoder; import org.apache.mina.filter.codec.demux.MessageDecoderResult; public class TestDecoder implements MessageDecoder { /** * 检查指定的缓冲区decodable解码器 * zxp */ public MessageDecoderResult decodable(IoSession arg0, ByteBuffer arg1) {    //包的长度是否大于0    if(arg1.remaining()<=0){     return MessageDecoderResult.NOT_OK;    }    return MessageDecoderResult.OK; } /** * 解码二进制或协议的具体内容到更高级别的消息对象 * (non-Javadoc) * @see org.apache.mina.filter.codec.demux.MessageDecoder#decode(org.apache.mina.common.IoSession, org.apache.mina.common.ByteBuffer, org.apache.mina.filter.codec.ProtocolDecoderOutput) */ public MessageDecoderResult decode(IoSession arg0, ByteBuffer arg1,     ProtocolDecoderOutput arg2) throws Exception {     //解码    byte[] b=new byte[arg1.limit()];    arg1.get(b);    System.out.println("decode:"+arg1.position());    SendMessages send=new SendMessages();    String s=new String(b);    send.setMsg(s);    arg2.write(send);    return MessageDecoderResult.OK; } /** * 解码完成后调用的方法 * */ public void finishDecode(IoSession arg0, ProtocolDecoderOutput arg1)     throws Exception { } } 

6.自定义消息类 

package Minatest; import org.apache.mina.common.ByteBuffer; public class SendMessages implements java.io.Serializable {     public String msg="0"; public String getMsg() {    return msg; } public void setMsg(String msg) {    this.msg = msg; } public int getmsgleng(){    return msg.getBytes().length; } public void encoder(ByteBuffer b){    b.put(msg.getBytes());    //b.putInt(1); }     } 

转载地址：http://xiuxian1.iteye.com/blog/585463