Mina自定义协议-实现数据交互

移动开发 2018-05-13 18:21:44 阅读次数: 2

本文主要现实mina的自定义协议，并且实现服务器和客户端的简单数据交互。

 

"mina协议的自定义"可参考本博Mina相关文章。

 

正题，所需要的基础类：

抽象协议类

请求协议

响应协议

(需要定制自己的协议格式)

 

协议编码解码工厂

协议编码

协议解码

 

客户端

客户端Handler

 

服务器

服务器Handler

 

 

/**
 * 消息协议
 * 
 * @author Simple
 * 
 */
public abstract class JAbsMessageProtocal {

  public abstract byte getTag();// 消息协议类型  请求/响应

  public abstract int getLength();// 消息协议数据长度
}

/**
 * 报头：
 *    short tag：请求/响应
 *    int   length：数据长度
 * 报体：
 *    short   methodCode：功能函数
 *    byte    resultCode：结果码
 *    String  content：数据内容
 */
 

 

/**
 * 消息协议-请求
 * 
 * @author Simple
 * 
 */
public class JMessageProtocalReq extends JAbsMessageProtocal {

  private short functionCode;// 功能代码

  private String content;// 请求内容

  @Override
  public int getLength() {
    return 2 + (content == null ? 0 : content.getBytes().length);
  }

  @Override
  public byte getTag() {
    return JConstant.REQ;
  }

  public void setFunctionCode(short functionCode) {
    this.functionCode=functionCode;
  }

  public short getFunctionCode() {
    return functionCode;
  }

  public void setContent(String content) {
    this.content=content;
  }

  public String getContent() {
    return content;
  }

  @Override
  public String toString() {
    return "JMessageProtocalReq [content=" + content + ", functionCode=" + functionCode + ", getLength()=" + getLength()
      + ", getTag()=" + getTag() + "]";
  }
}
  

/**
 * 消息协议-响应
 * 
 * @author Simple
 * 
 */
public class JMessageProtocalRes extends JAbsMessageProtocal {

  private byte resultCode;// 结果码

  private String content;// 响应内容

  @Override
  public int getLength() {
    return 1 + (getContent() == null ? 0 : getContent().getBytes().length);
  }

  @Override
  public byte getTag() {
    return JConstant.RES;
  }

  public void setResultCode(byte resultCode) {
    this.resultCode=resultCode;
  }

  public byte getResultCode() {
    return resultCode;
  }

  public void setContent(String content) {
    this.content=content;
  }

  public String getContent() {
    return content;
  }

  @Override
  public String toString() {
    return "JMessageProtocalRes [content=" + content + ", resultCode=" + resultCode + ", getLength()=" + getLength()
      + ", getTag()=" + getTag() + "]";
  }
}


/**
 * JMessageProtocal解码编码工厂
 * 
 * @author Simple
 * 
 */
public class JMessageProtocalCodecFactory implements ProtocolCodecFactory {

  private final JMessageProtocalDecoder decoder;

  private final JMessageProtocalEncoder encoder;

  public JMessageProtocalCodecFactory(Charset charset) {
    this.decoder=new JMessageProtocalDecoder(charset);
    this.encoder=new JMessageProtocalEncoder(charset);
  }

  public ProtocolDecoder getDecoder(IoSession paramIoSession) throws Exception {
    return decoder;
  }

  public ProtocolEncoder getEncoder(IoSession paramIoSession) throws Exception {
    return encoder;
  }
}


/**
 * JMessageProtocal解码
 * @author Simple
 *
 */
public class JMessageProtocalDecoder extends ProtocolDecoderAdapter {

  private Logger log=Logger.getLogger(JMessageProtocalDecoder.class);

  private Charset charset;

  public JMessageProtocalDecoder(Charset charset) {
    this.charset=charset;
  }

  /**
   * 解码
   */
  public void decode(IoSession session, IoBuffer buf, ProtocolDecoderOutput out) throws Exception {
    JAbsMessageProtocal absMP=null;
    // 获取协议tag
    byte tag=buf.get();
    // 获取协议体长度
    int length=buf.getInt();
    // 取出协议体
    byte[] bodyData=new byte[length];
    buf.get(bodyData);
    // 为解析数据做准备
    // 检测协议
    IoBuffer tempBuf=IoBuffer.allocate(100).setAutoExpand(true);
    tempBuf.put(tag);
    tempBuf.putInt(length);
    tempBuf.put(bodyData);
    tempBuf.flip();
    if(!canDecode(tempBuf)) {
      return;
    }
    // 协议体buf
    IoBuffer bodyBuf=IoBuffer.allocate(100).setAutoExpand(true);
    bodyBuf.put(bodyData);
    bodyBuf.flip();
    // 整个协议buf
    IoBuffer allBuf=IoBuffer.allocate(100).setAutoExpand(true);
    allBuf.put(tag);
    allBuf.putInt(length);
    allBuf.put(bodyData);
    allBuf.flip();
    //
    if(tag == JConstant.REQ) {
      JMessageProtocalReq req=new JMessageProtocalReq();
      short functionCode=bodyBuf.getShort();
      String content=bodyBuf.getString(charset.newDecoder());
      req.setFunctionCode(functionCode);
      req.setContent(content);
      absMP=req;
    } else if(tag == JConstant.RES) {
      JMessageProtocalRes res=new JMessageProtocalRes();
      byte resultCode=bodyBuf.get();
      String content=bodyBuf.getString(charset.newDecoder());
      res.setResultCode(resultCode);
      res.setContent(content);
      absMP=res;
    } else {
      log.error("未定义的Tag");
    }
    out.write(absMP);
  }

  // 是否可以解码
  private boolean canDecode(IoBuffer buf) {
    int protocalHeadLength=5;// 协议头长度
    int remaining=buf.remaining();
    if(remaining < protocalHeadLength) {
      log.error("错误，协议不完整，协议头长度小于" + protocalHeadLength);
      return false;
    } else {
      log.debug("协议完整");
      // 获取协议tag
      byte tag=buf.get();
      if(tag == JConstant.REQ || tag == JConstant.RES) {
        log.debug("Tag=" + tag);
      } else {
        log.error("错误，未定义的Tag类型");
        return false;
      }
      // 获取协议体长度
      int length=buf.getInt();
      if(buf.remaining() < length) {
        log.error("错误，真实协议体长度小于消息头中取得的值");
        return false;
      } else {
        log.debug("真实协议体长度:" + buf.remaining() + " = 消息头中取得的值:" + length);
      }
    }
    return true;
  }
}


/**
 * JMessageProtocal编码
 * @author Simple
 *
 */
public class JMessageProtocalEncoder extends ProtocolEncoderAdapter {

  private Charset charset;

  public JMessageProtocalEncoder(Charset charset) {
    this.charset=charset;
  }

  /**
   * 编码
   */
  public void encode(IoSession session, Object object, ProtocolEncoderOutput out) throws Exception {
    // new buf
    IoBuffer buf=IoBuffer.allocate(2048).setAutoExpand(true);
    // object --> AbsMP
    JAbsMessageProtocal absMp=(JAbsMessageProtocal)object;
    buf.put(absMp.getTag());
    buf.putInt(absMp.getLength());
    if(object instanceof JMessageProtocalReq) {// 请求协议
      JMessageProtocalReq mpReq=(JMessageProtocalReq)object;
      buf.putShort(mpReq.getFunctionCode());
      buf.putString(mpReq.getContent(), charset.newEncoder());
    } else if(object instanceof JMessageProtocalRes) {// 响应协议
      JMessageProtocalRes mpRes=(JMessageProtocalRes)object;
      buf.put(mpRes.getResultCode());
      buf.putString(mpRes.getContent(), charset.newEncoder());
    }
    buf.flip();
    out.write(buf);
  }
}


/**
 * MINA 客户端
 * 
 * @author Simple
 * 
 */
public class MainClient {

  @SuppressWarnings("unused")
  private static Logger log=Logger.getLogger(MainClient.class);

  private static final int PORT=9999;

  public static void main(String[] args) {
    NioSocketConnector connector=new NioSocketConnector();
    DefaultIoFilterChainBuilder chain=connector.getFilterChain();
    chain.addLast("ProtocolCodecFilter", new ProtocolCodecFilter(new JMessageProtocalCodecFactory(Charset.forName("UTF-8"))));
    connector.setHandler(new MinaClientHandler());
    connector.setConnectTimeoutMillis(3000);
    ConnectFuture cf=connector.connect(new InetSocketAddress("localhost", PORT));
    cf.awaitUninterruptibly();// 等待连接创建完成
    JMessageProtocalReq req=new JMessageProtocalReq();
    req.setFunctionCode((short)1);
    req.setContent("hello world!!!");
    cf.getSession().write(req);
    cf.getSession().getCloseFuture().awaitUninterruptibly();// 等待连接断开
    connector.dispose();
  }
}


/**
 * MINA 客户端消息处理
 * 
 * @author Simple
 * 
 */
public class MinaClientHandler extends IoHandlerAdapter {

  private Logger log=Logger.getLogger(MinaClientHandler.class);

  @Override
  public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
    log.error(String.format("Client产生异常!"));
  }

  @Override
  public void messageReceived(IoSession session, Object message) throws Exception {
    log.debug(String.format("来自Server[%s]的消息:%s", session.getRemoteAddress(), message.toString()));
  }

  @Override
  public void messageSent(IoSession session, Object message) throws Exception {
    log.debug(String.format("向Server[%s]发送消息:%s", session.getRemoteAddress(), message.toString()));
  }

  @Override
  public void sessionClosed(IoSession session) throws Exception {
    log.debug(String.format("与Server[%s]断开连接!", session.getRemoteAddress()));
  }

  @Override
  public void sessionCreated(IoSession session) throws Exception {
    log.debug(String.format("与Server[%s]建立连接!", session.getRemoteAddress()));
  }

  @Override
  public void sessionOpened(IoSession session) throws Exception {
    log.debug(String.format("与Server[%s]打开连接!", session.getRemoteAddress()));
  }

  @Override
  public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
    log.debug(String.format("Client进入空闲状态!"));
  }
}


/**
 * MINA 服务器
 * 
 * @author Simple
 * 
 */
public class MainServer {

  private static Logger log=Logger.getLogger(MainServer.class);

  private static final int PORT=9999;

  public static void main(String[] args) throws Exception {
    SocketAcceptor acceptor=new NioSocketAcceptor();// tcp/ip 接收者
    DefaultIoFilterChainBuilder chain=acceptor.getFilterChain();// 过滤管道
    chain.addLast("ProtocolCodecFilter", new ProtocolCodecFilter(new JMessageProtocalCodecFactory(Charset.forName("UTF-8"))));
    acceptor.getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, 10);// 读写通道10s内无操作进入空闲状态
    acceptor.setHandler(new MinaServerHandler());// 设置handler
    acceptor.bind(new InetSocketAddress(PORT));// 设置端口
    log.debug(String.format("Server Listing on %s", PORT));
  }
}


/**
 * MINA 服务器消息处理
 * 
 * @author Simple
 * 
 */
public class MinaServerHandler extends IoHandlerAdapter {

  private Logger log=Logger.getLogger(MinaServerHandler.class);

  @Override
  public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
    log.error(String.format("Server产生异常!"));
  }

  @Override
  public void messageReceived(IoSession session, Object message) throws Exception {
    log.debug(String.format("来自Client[%s]的消息:%s", session.getRemoteAddress(), message.toString()));
  }

  @Override
  public void messageSent(IoSession session, Object message) throws Exception {
    log.debug(String.format("向Client[%s]发送消息:%s", session.getRemoteAddress(), message.toString()));
  }

  @Override
  public void sessionClosed(IoSession session) throws Exception {
    log.debug(String.format("Client[%s]与Server断开连接!", session.getRemoteAddress()));
  }

  @Override
  public void sessionCreated(IoSession session) throws Exception {
    log.debug(String.format("Client[%s]与Server建立连接!", session.getRemoteAddress()));
  }

  @Override
  public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
    log.debug(String.format("Server进入空闲状态!"));
  }

  @Override
  public void sessionOpened(IoSession session) throws Exception {
    log.debug(String.format("Client[%s]与Server打开连接!", session.getRemoteAddress()));
  }
}

如果想深入了解mina，我感觉还得去读一下mina的源码，会有很大的收获。

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转载自simple1024.iteye.com/blog/1763648
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