Mina airQQ聊天服务端篇（二）

Mina聊天服务端实现思路：在用户登录的时候。连接服务端而且验证登录用户，假设成功，则将IoSession保存到map<账号，IoSession>中，而且通知该用户的好友上线，然

后再请求好友列表；若不成功，则断开连接。

自己定义协议格式：包头+包体

包头（10字节）：包头长度（short）+ 消息类型（byte）+ 内容类型（byte） + 消息命令（short）+ 包体长度（int）

包体：JSON字符串

自己定义编码解码：因为数据在网络传输过程中都是以二进制传输的，所以我们能够自己定义自己的编码解码格式。具体实现代码能够看以下的

ChatServerDecode和ChatServerEncode

数据库（chat）：三张表用户表（user）。好友表（friends），分类表（category）

/*

Navicat MySQL Data Transfer

Source Server         : bufoon

Source Server Version : 50527

Source Host           : localhost:3306

Source Database       : chat

Target Server Type    : MYSQL

Target Server Version : 50527

File Encoding         : 65001

Date: 2014-06-29 23:30:28

*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------

-- Table structure for category

-- ----------------------------

DROP TABLE IF EXISTS `category`;

CREATE TABLE `category` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `user_id` int(11) DEFAULT NULL,

  `name` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,

  `create_time` datetime DEFAULT NULL,

  PRIMARY KEY (`id`),

  KEY `FK_CATEGOFY_USER_ID` (`user_id`),

  CONSTRAINT `FK_CATEGOFY_USER_ID` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE

) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

-- ----------------------------

-- Records of category

-- ----------------------------

INSERT INTO `category` VALUES ('1', '1', '我的好友', '2014-06-29 19:00:25');

INSERT INTO `category` VALUES ('3', '2', '我的好友', '2014-06-29 19:00:55');

INSERT INTO `category` VALUES ('4', '3', '我的好友', '2014-06-29 19:01:00');

INSERT INTO `category` VALUES ('5', '1', '同学', '2014-06-29 20:39:04');

-- ----------------------------

-- Table structure for friends

-- ----------------------------

DROP TABLE IF EXISTS `friends`;

CREATE TABLE `friends` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `user_id` int(11) DEFAULT NULL,

  `friend_id` int(11) DEFAULT NULL,

  `category_id` int(11) DEFAULT NULL,

  `create_time` datetime DEFAULT NULL,

  PRIMARY KEY (`id`),

  KEY `FK_FRIENDS_USER_ID` (`user_id`),

  KEY `FK_FRIENDS_CATEGORY_ID` (`category_id`),

  KEY `FK_FRIENDS_FUSER_ID` (`friend_id`),

  CONSTRAINT `FK_FRIENDS_CATEGORY_ID` FOREIGN KEY (`category_id`) REFERENCES `category` (`id`) ON DELETE CASCADE,

  CONSTRAINT `FK_FRIENDS_FUSER_ID` FOREIGN KEY (`friend_id`) REFERENCES `user` (`id`) ON DELETE CASCADE,

  CONSTRAINT `FK_FRIENDS_USER_ID` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE

) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

-- ----------------------------

-- Records of friends

-- ----------------------------

INSERT INTO `friends` VALUES ('1', '1', '2', '1', '2014-06-21 23:35:16');

INSERT INTO `friends` VALUES ('2', '1', '3', '1', '2014-06-21 23:35:22');

INSERT INTO `friends` VALUES ('3', '2', '1', '3', '2014-06-22 02:09:24');

INSERT INTO `friends` VALUES ('4', '3', '1', '4', '2014-06-22 02:09:29');

-- ----------------------------

-- Table structure for user

-- ----------------------------

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `name` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,

  `user_num` varchar(15) COLLATE utf8_unicode_ci DEFAULT NULL,

  `password` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,

  `regist_time` datetime DEFAULT NULL,

  `sex` varchar(2) COLLATE utf8_unicode_ci DEFAULT NULL,

  `signature` varchar(300) COLLATE utf8_unicode_ci DEFAULT NULL,

  `head_pic_path` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,

  `is_online` varchar(1) COLLATE utf8_unicode_ci DEFAULT NULL,

  PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

-- ----------------------------

-- Records of user

-- ----------------------------

INSERT INTO `user` VALUES ('1', '张三', '12345', '12345', '2014-06-20 23:32:26', '男', null, null, '0');

INSERT INTO `user` VALUES ('2', '李四', '123456', '123456', '2014-06-20 23:32:31', '女', null, null, '1');

INSERT INTO `user` VALUES ('3', '王二', '1234567', '1234567', '2014-06-21 11:29:41', '男', null, null, '1');

项目文件夹结构：

须要的jar包：

ChatServer.java

package com.bufoon.main;

import java.io.IOException;

import java.net.InetSocketAddress;

import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;

import org.apache.mina.core.session.IdleStatus;

import org.apache.mina.filter.codec.ProtocolCodecFilter;

import org.apache.mina.filter.keepalive.KeepAliveFilter;

import org.apache.mina.filter.keepalive.KeepAliveMessageFactory;

import org.apache.mina.filter.keepalive.KeepAliveRequestTimeoutHandler;

import org.apache.mina.filter.logging.LogLevel;

import org.apache.mina.filter.logging.LoggingFilter;

import org.apache.mina.transport.socket.SocketAcceptor;

import org.apache.mina.transport.socket.nio.NioSocketAcceptor;

import com.bufoon.codeFactory.ChatServerCodecFactory;

import com.bufoon.handle.ChatServerHandle;

import com.bufoon.handle.KeepAliveMessageFactoryImpl;

import com.bufoon.handle.KeepAliveRequestTimeoutHandlerImpl;

public class ChatServer {

	private static final int PORT = 7073;

	//30秒后超时

    private static final int IDELTIMEOUT = 30;

    //15秒发送一次心跳包

    private static final int HEARTBEATRATE = 15;

    private static SocketAcceptor acceptor;

    public static SocketAcceptor getAcceptor(){

    	if(null==acceptor){

    		// 创建非堵塞的server端的Socket连接

    		acceptor = new NioSocketAcceptor();

    	}

    	return acceptor;

    }

    public static boolean serverStart() {

        DefaultIoFilterChainBuilder filterChain = getAcceptor().getFilterChain();

        // 加入编码过滤器 处理乱码、编码问题

        filterChain.addLast("codec", new ProtocolCodecFilter(new ChatServerCodecFactory()));

        LoggingFilter loggingFilter = new LoggingFilter();

        loggingFilter.setMessageReceivedLogLevel(LogLevel.INFO);

        loggingFilter.setMessageSentLogLevel(LogLevel.INFO);

        // 加入日志过滤器

        filterChain.addLast("loger", loggingFilter);

        // 设置核心消息业务处理器

        getAcceptor().setHandler(new ChatServerHandle());

        KeepAliveMessageFactory heartBeatFactory = new KeepAliveMessageFactoryImpl();

        KeepAliveRequestTimeoutHandler heartBeatHandler = new KeepAliveRequestTimeoutHandlerImpl();

        KeepAliveFilter heartBeat = new KeepAliveFilter(heartBeatFactory,IdleStatus.BOTH_IDLE, heartBeatHandler);

        // 是否回发

        heartBeat.setForwardEvent(true);

        // 发送频率

        heartBeat.setRequestInterval(HEARTBEATRATE);

       // getAcceptor().getFilterChain().addLast("heartbeat", heartBeat);

        getAcceptor().getSessionConfig().setBothIdleTime(30);

        // 设置session配置，30秒内无操作进入空暇状态

        getAcceptor().getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, IDELTIMEOUT);

        try {

            // 绑定端口7033

        	getAcceptor().bind(new InetSocketAddress(PORT));

        	return true;

        } catch (IOException e) {

            e.printStackTrace();

        }

        return false;

    }

    public static void main(String[] args) {

    	ChatServer.serverStart();

		System.out.println("服务器启动...");

	}

}

ChatServerHandle.java

package com.bufoon.handle;

import java.sql.ResultSet;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

import org.apache.mina.core.service.IoHandlerAdapter;

import org.apache.mina.core.session.IdleStatus;

import org.apache.mina.core.session.IoSession;

import org.apache.mina.example.chat.ChatProtocolHandler;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import com.bufoon.model.CategoryModel;

import com.bufoon.model.FriendsModel;

import com.bufoon.model.LoginModel;

import com.bufoon.model.PackageHead;

import com.bufoon.model.SendModel;

import com.bufoon.model.UserModel;

import com.bufoon.util.BaseDAO;

import com.bufoon.util.DBUtil;

import com.bufoon.util.MessageType;

public class ChatServerHandle extends IoHandlerAdapter {

	private final static Logger logger = LoggerFactory.getLogger(ChatProtocolHandler.class);

	public static Map<String, IoSession> sessionMap = new HashMap<String, IoSession>();

	@Override

	public void sessionCreated(IoSession session) throws Exception {

		logger.info("创建连接");

	}

	@Override

	public void sessionOpened(IoSession session) throws Exception {

		logger.info("打开连接");

	}

	@Override

	public void sessionClosed(IoSession session) throws Exception {

		logger.info("关闭连接");

		String userNum = (String) session.getAttribute("userNum");

		String sql = "update user set is_online=1 where user_num like'" + userNum + "'";

		DBUtil.getInstance().executeUpdate(sql);

		sessionMap.remove(userNum);

		//改动下线。通知

		String userSql = "select * from user where user_num like '" + userNum + "'";

		UserModel userModel = BaseDAO.getInstance().findUserModel(userSql);

		String friendListSql = "select * from friends where user_id=" + userModel.getId();

		List<FriendsModel> list = BaseDAO.getInstance().findFriendsList(friendListSql);

		for (FriendsModel friendsModel : list) {

			String fUserSql = "select * from user where id=" + friendsModel.getFriendId();

			UserModel userModel2 = BaseDAO.getInstance().findUserModel(fUserSql);

			IoSession is = sessionMap.get(userModel2.getUserNum());

			if (is != null) {

				PackageHead ph = new PackageHead();

				Map<String, Object> object = new HashMap<String, Object>();

		        object.put("userNum", userModel2.getUserNum());

		        object.put("status", 1); //下线

		        String content = JSONObject.fromObject(object).toString();

		        ph.setPackageHeadLength(10);

		        ph.setMessageCommand(MessageType.USER_ON_OFF_LINE_NOTICE);

		        ph.setContentType(MessageType.CONTENT_TYPE_OBJECT);

		        ph.setMessageType(MessageType.MESSAGE_TYPE_PUSH);

		        ph.setPackageBodyLength(content.getBytes().length);

		        ph.setPackageBodyContent(content);

				is.write(ph);

			}

		}

	}

	@Override

	public void sessionIdle(IoSession session, IdleStatus status)

			throws Exception {

		logger.info("进入空暇");

	}

	@Override

	public void exceptionCaught(IoSession session, Throwable cause)

			throws Exception {

		logger.warn("异常.", cause);

	    session.close(true);

	}

	@Override

	public void messageReceived(IoSession session, Object message)

			throws Exception {

		System.out.println(message);

		PackageHead ph = (PackageHead) message;

		System.out.println("还有没有这个session：" + sessionMap.size());

		switch (ph.getMessageCommand()) {

			case MessageType.LOGIN_VERIFY: //登录请求

				LoginModel loginModel = (LoginModel)JSONObject.toBean(JSONObject.fromObject(ph.getPackageBodyContent()), LoginModel.class);

				String username = loginModel.getUsername();

				IoSession is = sessionMap.get(username);

				Map<String, Object> map = new HashMap<String, Object>();

				if (!DBUtil.getInstance().isExit("user", "user_num", username)) {

					System.out.println("用户不存在");

					map.put("status", 1);

					map.put("info", "用户不存在");

					map.put("username", username);

				} else if (is != null && is.isConnected()) {

					System.out.println("用户已登录");

					map.put("status", 2);

					map.put("info", "用户已登录");

					map.put("username", username);

				} else if (!DBUtil.getInstance().isExit("user", new String[]{"user_num", "password"}, new Object[]{username, loginModel.getPassword()})) {

					System.out.println("用户密码错误");

					map.put("status", 3);

					map.put("info", "用户密码错误");

					map.put("username", username);

				} else if (DBUtil.getInstance().isExit("user", new String[]{"user_num", "password"}, new Object[]{username, loginModel.getPassword()})) {

					String sql = "select * from user where user_num like '" + username + "'";

					ResultSet rs = DBUtil.getInstance().executeQuery(sql);

					UserModel vo = null;

					while (rs.next()) {

						vo = new UserModel();

						vo.setId(rs.getInt("id"));

						vo.setUsername(rs.getString("name"));

						vo.setUserNum(rs.getString("user_num"));

						vo.setPassword(rs.getString("password"));

						vo.setSex(rs.getString("sex"));

						vo.setSignature(rs.getString("signature"));

						vo.setIsOnline(rs.getInt("is_online"));

						break;

					}

					if (vo != null) {

						map.put("username", vo.getUsername());

					}

					map.put("status", 0);

					map.put("info", "成功");

					map.put("userNum", username);

					map.put("userVO", vo);

					session.setAttribute("userNum", username);

					sessionMap.put(username, session);

				}

				String onLinesql = "update user set is_online=0 where user_num like'" + username + "'";

				DBUtil.getInstance().executeUpdate(onLinesql);

				String content = JSONObject.fromObject(map).toString();

	            ph.setMessageCommand(MessageType.LOGIN_VERIFY_ACK);

	            ph.setContentType(MessageType.CONTENT_TYPE_OBJECT);

	            ph.setMessageType(MessageType.MESSAGE_TYPE_REQUEST);

	            ph.setPackageBodyLength(content.getBytes().length);

	            ph.setPackageBodyContent(content);

	            session.write(ph);

	            String friendSql = "select * from user where user_num like '" + username + "'";

	            ResultSet rs1 = DBUtil.getInstance().executeQuery(friendSql);

	            Map<String, Object> object = new HashMap<String, Object>();

	            object.put("userNum", username);

	            object.put("status", 0);

	            content = JSONObject.fromObject(object).toString();

	            ph.setMessageCommand(MessageType.USER_ON_OFF_LINE_NOTICE);

	            ph.setContentType(MessageType.CONTENT_TYPE_OBJECT);

	            ph.setMessageType(MessageType.MESSAGE_TYPE_PUSH);

	            ph.setPackageBodyLength(content.getBytes().length);

	            ph.setPackageBodyContent(content);

	            while (rs1.next()) {

	            	String sql1 = "select * from friends where user_id=" + rs1.getInt("id");

	            	 ResultSet rs2 = DBUtil.getInstance().executeQuery(sql1);

	            	 while(rs2.next()){

	            		 String sql2 = "select * from user where id=" + rs2.getInt("friend_id");

	            		 ResultSet rs3 = DBUtil.getInstance().executeQuery(sql2);

	            		 while(rs3.next()){

	            			IoSession iso = sessionMap.get(rs3.getString("user_num"));

	            			if(iso != null){

	            				iso.write(ph);

	            			}

	            		 }

	            	 }

	            }

				break;

			case MessageType.FRIEND_LIST: //好友列表请求

				JSONObject  obj = JSONObject.fromObject(ph.getPackageBodyContent());

				String userId = obj.getString("userId");

				String friendListSql = "select * from friends where user_id=" + userId;

				List<FriendsModel> friendList = BaseDAO.getInstance().findFriendsList(friendListSql);

				String categorySql = "select * from category where user_id=" + userId;

				List<CategoryModel> categoryList = BaseDAO.getInstance().findCategoryList(categorySql);

				for (CategoryModel categoryModel : categoryList) {

					for (FriendsModel friendModel : friendList) {

						if (categoryModel.getId() == friendModel.getCategoryId()) {

							String userSql = "select * from user where id=" + friendModel.getFriendId();

							categoryModel.getList().add(BaseDAO.getInstance().findUserModel(userSql));

						}

					}

				}

				String friends = JSONArray.fromObject(categoryList).toString();

				System.out.println("frends:" + friends);

	            ph.setMessageCommand(MessageType.FRIEND_LIST_ACK);

	            ph.setContentType(MessageType.CONTENT_TYPE_ARRAY);

	            ph.setMessageType(MessageType.MESSAGE_TYPE_REQUEST);

	            ph.setPackageBodyLength(friends.getBytes().length);

	            ph.setPackageBodyContent(friends);

	            session.write(ph);

				break;

			case MessageType.SEND_MESSAGE: //消息发送

				SendModel sendModel = (SendModel)JSONObject.toBean(JSONObject.fromObject(ph.getPackageBodyContent()), SendModel.class);

				ph.setMessageType(MessageType.SEND_MESSAGE_ACK);

				session.write(ph);

				ph.setMessageCommand(MessageType.SEND_MESSAGE_ACK_NOTICE);

				String sendStr = JSONObject.fromObject(sendModel).toString();

				ph.setPackageBodyLength(sendStr.getBytes().length);

				ph.setPackageBodyContent(sendStr);

				ph.setMessageType(MessageType.MESSAGE_TYPE_PUSH);

				ph.setContentType(MessageType.CONTENT_TYPE_OBJECT);

				sessionMap.get(sendModel.getReceiverNum()).write(ph);

				break;

			//查找好友

			//注冊

			//加入好友

		}

	}

	@Override

	public void messageSent(IoSession session, Object message) throws Exception {

		logger.info("发送消息: " + message);

	}

}

ChatServerCodecFactory.java

package com.bufoon.codeFactory;

import java.nio.charset.Charset;

import org.apache.mina.core.session.IoSession;

import org.apache.mina.filter.codec.ProtocolCodecFactory;

import org.apache.mina.filter.codec.ProtocolDecoder;

import org.apache.mina.filter.codec.ProtocolEncoder;

public class ChatServerCodecFactory implements ProtocolCodecFactory{

	private static final Charset charset = Charset.forName("UTF-8");

	@Override

	public ProtocolEncoder getEncoder(IoSession session) throws Exception {

		return new ChatServerEncode(charset);

	}

	@Override

	public ProtocolDecoder getDecoder(IoSession session) throws Exception {

		return new ChatServerDecode(charset);

	}

}

ChatServerDecode.java

package com.bufoon.codeFactory;

import java.nio.ByteOrder;

import java.nio.charset.Charset;

import org.apache.mina.core.buffer.IoBuffer;

import org.apache.mina.core.session.AttributeKey;

import org.apache.mina.core.session.IoSession;

import org.apache.mina.filter.codec.ProtocolDecoder;

import org.apache.mina.filter.codec.ProtocolDecoderOutput;

import com.bufoon.model.PackageHead;

public class ChatServerDecode implements ProtocolDecoder {

	private final AttributeKey CONTEXT = new AttributeKey(getClass(), "context");

	private final Charset charset;

	private int maxPackLength = 100;

	public ChatServerDecode() {

		this(Charset.defaultCharset());

	}

	public ChatServerDecode(Charset charset) {

		this.charset = charset;

	}

	public int getMaxLineLength() {

		return maxPackLength;

	}

	public void setMaxLineLength(int maxLineLength) {

		if (maxLineLength <= 0) {

			throw new IllegalArgumentException("maxLineLength: "

					+ maxLineLength);

		}

		this.maxPackLength = maxLineLength;

	}

	private ChatContext getContext(IoSession session) {

		ChatContext ctx;

		ctx = (ChatContext) session.getAttribute(CONTEXT);

		if (ctx == null) {

			ctx = new ChatContext(charset);

			session.setAttribute(CONTEXT, ctx);

		}

		return ctx;

	}

	@Override

	public void decode(IoSession session, IoBuffer in, ProtocolDecoderOutput out)

			throws Exception {

		final int packHeadLength = 10;

		// 先获取上次的处理上下文，其中可能有未处理完的数据

		in.order(ByteOrder.LITTLE_ENDIAN);

		ChatContext ctx = getContext(session);

		// 先把当前buffer中的数据追加到Context的buffer其中

		ctx.append(in);

		// 把position指向0位置。把limit指向原来的position位置

		IoBuffer buf = ctx.getBuffer();

		buf.flip();

		// 然后按数据包的协议进行读取

		if (buf.remaining() >= packHeadLength) {

			buf.mark();

			// 读取消息头部分

			PackageHead message = new PackageHead();

			message.setPackageHeadLength(buf.getShort());

			message.setMessageType(buf.get());

			message.setContentType(buf.get());

			message.setMessageCommand(buf.getShort());

			int bodyLen = buf.getInt();

			message.setPackageBodyLength(bodyLen);

			// 读取正常的消息包。并写入输出流中，以便IoHandler进行处理

			if (bodyLen > 0 && buf.remaining() >= bodyLen) {

	              message.setPackageBodyContent(buf.getString(bodyLen, charset.newDecoder()));

			} else {

				//buf.clear();

			}

			out.write(message);

		}

		if (buf.hasRemaining()) {

			// 将数据移到buffer的最前面

			IoBuffer temp = IoBuffer.allocate(maxPackLength)

					.setAutoExpand(true);

			temp.put(buf);

			temp.flip();

			buf.clear();

			buf.put(temp);

		} else {// 假设数据已经处理完成，进行清空

			buf.clear();

		}

	}

	@Override

	public void finishDecode(IoSession session, ProtocolDecoderOutput out)

			throws Exception {

	}

	@Override

	public void dispose(IoSession session) throws Exception {

		ChatContext ctx = (ChatContext) session.getAttribute(CONTEXT);

		if (ctx != null) {

			session.removeAttribute(CONTEXT);

		}

	}

}

ChatServerEncode.java

package com.bufoon.codeFactory;

import java.nio.ByteOrder;

import java.nio.charset.Charset;

import org.apache.mina.core.buffer.IoBuffer;

import org.apache.mina.core.session.IoSession;

import org.apache.mina.filter.codec.ProtocolEncoderAdapter;

import org.apache.mina.filter.codec.ProtocolEncoderOutput;

import com.bufoon.model.PackageHead;

public class ChatServerEncode extends ProtocolEncoderAdapter {

	private Charset charset = null;

	public ChatServerEncode(Charset charset) {

		this.charset = charset;

	}

	@Override

	public void encode(IoSession session, Object message,

			ProtocolEncoderOutput out) throws Exception {

		if (message instanceof PackageHead) {

			PackageHead ph = (PackageHead) message;

			IoBuffer buf = IoBuffer.allocate(ph.getPackageHeadLength() + ph.getPackageBodyLength());

			buf.order(ByteOrder.LITTLE_ENDIAN);

			//buf.setAutoExpand(true);

			buf.putShort((short) ph.getPackageHeadLength());

			buf.put((byte) ph.getMessageType());

			buf.put((byte) ph.getContentType());

			buf.putShort((short) ph.getMessageCommand());

			buf.putInt((int) ph.getPackageBodyLength());

			if (ph.getPackageBodyLength() > 0) {

				buf.putString(ph.getPackageBodyContent(), charset.newEncoder());

			}

			buf.flip();

			out.write(buf);

			out.flush();

			buf.free();

		}

	}

}

ChatContext.java

package com.bufoon.codeFactory;

import java.nio.ByteOrder;

import java.nio.charset.Charset;

import java.nio.charset.CharsetDecoder;

import org.apache.mina.core.buffer.IoBuffer;

public class ChatContext {

	private final CharsetDecoder decoder;

	private IoBuffer buf;

	private int matchCount = 0;

	private int overflowPosition = 0;

	public ChatContext(Charset charset) {

		decoder = charset.newDecoder();

		buf = IoBuffer.allocate(80).setAutoExpand(true);

		buf.order(ByteOrder.LITTLE_ENDIAN);

	}

	public CharsetDecoder getDecoder() {

		return decoder;

	}

	public IoBuffer getBuffer() {

		return buf;

	}

	public int getOverflowPosition() {

		return overflowPosition;

	}

	public int getMatchCount() {

		return matchCount;

	}

	public void setMatchCount(int matchCount) {

		this.matchCount = matchCount;

	}

	public void reset() {

		overflowPosition = 0;

		matchCount = 0;

		decoder.reset();

	}

	public void append(IoBuffer in) {

		getBuffer().put(in);

	}

}

MessageType.java

package com.bufoon.util;

public class MessageType {

	/**登录验证请求消息类型**/

	public final static int LOGIN_VERIFY = 0x0000;

	/**登录验证响应消息类型**/

	public final static int LOGIN_VERIFY_ACK = 0x0001;

	/**心跳请求消息类型**/

	public final static int HEART_BEAT = 0x0002;

	/**心跳响应消息类型**/

	public final static int HEART_BEAT_ACK = 0x0003;

	/**好友列表请求消息类型**/

	public final static int FRIEND_LIST = 0x0004;

	/**好友列表响应消息类型**/

	public final static int FRIEND_LIST_ACK = 0x0005;

	/**发送消息请求**/

	public final static int SEND_MESSAGE = 0x0006;

	/**发送消息响应**/

	public final static int SEND_MESSAGE_ACK = 0x0007;

	/**发送消息通知响应**/

	public final static int SEND_MESSAGE_ACK_NOTICE = 0x1000;

	/**通知用户上下线**/

	public final static int USER_ON_OFF_LINE_NOTICE = 0X1001;

	/**包头大小**/

	public final static int HEAD_LENGTH = 10;

	/**返回的消息类型 0服务端推送**/

	public final static int MESSAGE_TYPE_PUSH = 0;

	/**返回的消息类型 1请求响应**/

	public final static int MESSAGE_TYPE_REQUEST = 1;

	/**返回的内容类型 0 JsonObject**/

	public final static int CONTENT_TYPE_OBJECT = 0;

	/**返回的内容类型 1 JsonArray**/

	public final static int CONTENT_TYPE_ARRAY = 1;

}

DBUtil.java

package com.bufoon.util;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

/**

 * 数据库 连接类

 * @author AllenYe

 *

 */

public class DBUtil

{

	private static final DBUtil uniqueInstance = new DBUtil();

	private DBUtil(){

		//载入mysql-jdbc桥接器：

				try{

					Class.forName("com.mysql.jdbc.Driver");

				}catch(ClassNotFoundException e){}

	}

	public static DBUtil getInstance() {

	        return uniqueInstance;

	}

	//公共的connection

	private Connection conn=null;

	private Connection getConnection() throws Exception

	{

		if(conn == null)

		{

			//设置connection的url，账号，password

			conn=DriverManager.getConnection(

					"jdbc:mysql://localhost:3306/chat?

useUnicode=true&characterEncoding=UTF-8"

					,"root"

					,"root");

		}

		return conn;

	}

	public ResultSet executeQuery(String sql)

	{

		try

		{

			Statement statement = getConnection().createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

			ResultSet rs = statement.executeQuery(sql);

			return rs;

		} catch (SQLException e) {

			e.printStackTrace();

		} catch (Exception e) {

			e.printStackTrace();

		}

		return null;

	}

	public int executeUpdate(String sql)

	{

		try

		{

			PreparedStatement statement = getConnection().prepareStatement(sql, ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);

			int result = statement.executeUpdate();

			return result;

		} catch (SQLException e) {

			e.printStackTrace();

		} catch (Exception e) {

			e.printStackTrace();

		}

		return -1;

	}

	public boolean isExit(String table, String column, String value){

		String sql = "select * from " +  table + " where " + column + " like '" + value + "'";

		ResultSet rs = this.executeQuery(sql);

		boolean flag = false;

		try {

			while (rs.next()) {

				flag = true;

				break;

			}

		} catch (SQLException e) {

			e.printStackTrace();

		}

		return flag;

	}

	public boolean isExit(String table, String column[], Object value[]){

		StringBuffer sb = new StringBuffer("select * from " + table + " where 1=1");

		for(int i = 0; i < column.length; i++){

			sb.append(" and " + column[i] + " like '" + value[i] + "'");

		}

		ResultSet rs = this.executeQuery(sb.toString());

		boolean flag = false;

		try {

			while (rs.next()) {

				flag = true;

				break;

			}

		} catch (SQLException e) {

			e.printStackTrace();

		}

		return flag;

	}

}

BaseDAO.java

package com.bufoon.util;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import com.bufoon.model.CategoryModel;

import com.bufoon.model.FriendsModel;

import com.bufoon.model.UserModel;

public class BaseDAO {

	private static final BaseDAO uniqueInstance = new BaseDAO();

	private BaseDAO(){

	}

	public static BaseDAO getInstance() {

	        return uniqueInstance;

	}

	public UserModel findUserModel(String sql){

		UserModel vo = null;

		try {

			ResultSet rs = DBUtil.getInstance().executeQuery(sql);

			while(rs.next()){

				vo = new UserModel();

				vo.setId(rs.getInt("id"));

				vo.setUsername(rs.getString("name"));

				vo.setUserNum(rs.getString("user_num"));

				vo.setPassword(rs.getString("password"));

				vo.setIsOnline(rs.getInt("is_online"));

				vo.setSignature(rs.getString("signature"));

				vo.setSex(rs.getString("sex"));

			}

		} catch (SQLException e) {

			e.printStackTrace();

		}

		return vo;

	}

	public List<FriendsModel> findFriendsList(String sql){

		List<FriendsModel> list = new ArrayList<FriendsModel>();

		try {

			ResultSet rs = DBUtil.getInstance().executeQuery(sql);

			FriendsModel vo = null;

			while(rs.next()){

				vo = new FriendsModel();

				vo.setId(rs.getInt("id"));

				vo.setUserId(rs.getInt("user_id"));

				vo.setFriendId(rs.getInt("friend_id"));

				vo.setCategoryId(rs.getInt("category_id"));

				vo.setCreateTime(Util.formatTime(rs.getDate("create_time")));

				list.add(vo);

			}

		} catch (SQLException e) {

			e.printStackTrace();

		}

		return list;

	}

	public List<CategoryModel> findCategoryList(String sql){

		List<CategoryModel> list = new ArrayList<CategoryModel>();

		CategoryModel vo = null;

		ResultSet rs = DBUtil.getInstance().executeQuery(sql);

		try {

			while(rs.next()){

				vo = new CategoryModel();

				vo.setId(rs.getInt("id"));

				vo.setUserId(rs.getInt("user_id"));

				vo.setName(rs.getString("name"));

				vo.setCreateTime(Util.formatTime(rs.getDate("create_time")));

				list.add(vo);

			}

		} catch (SQLException e) {

			e.printStackTrace();

		}

		return list;

	}

}

PackageHead.java

package com.bufoon.model;

import java.io.Serializable;

public class PackageHead implements Serializable {

	private static final long serialVersionUID = 3965541808116510722L;

	private int id; //id

	private int packageHeadLength; //包头长度  short 2个字节  长度为10

	private int messageType; //消息类型  byte 1字节

	private int contentType; //内容类型  1字节

	private int messageCommand;  //消息命令 short 2字节

	private int packageBodyLength;  //包体长度 消息int 4字节

	private String packageBodyContent; //包体内容   大小 为packageBodyLength

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public int getPackageHeadLength() {

		return packageHeadLength;

	}

	public void setPackageHeadLength(int packageHeadLength) {

		this.packageHeadLength = packageHeadLength;

	}

	public int getMessageType() {

		return messageType;

	}

	public void setMessageType(int messageType) {

		this.messageType = messageType;

	}

	public int getContentType() {

		return contentType;

	}

	public void setContentType(int contentType) {

		this.contentType = contentType;

	}

	public int getMessageCommand() {

		return messageCommand;

	}

	public void setMessageCommand(int messageCommand) {

		this.messageCommand = messageCommand;

	}

	public int getPackageBodyLength() {

		return packageBodyLength;

	}

	public void setPackageBodyLength(int packageBodyLength) {

		this.packageBodyLength = packageBodyLength;

	}

	public String getPackageBodyContent() {

		return packageBodyContent;

	}

	public void setPackageBodyContent(String packageBodyContent) {

		this.packageBodyContent = packageBodyContent;

	}

	@Override

	public String toString() {

		return "Messeage is: command=" + getMessageCommand() + ", type=" + getMessageType() + ", contentLength=" + getPackageBodyLength() + ", content=" + getPackageBodyContent();

	}

}

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