tomcat7 websocket demo

 參考：

 * http://www.eoeandroid.com/thread-272068-1-1.html
 * http://blog.csdn.net/baiyang_liu/article/details/8261089

ChatWebSocketServlet.java

package jmind.ws.tomcat;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;
import org.apache.catalina.websocket.WsOutbound;

/**

 * 
 * chat.jsp
 * @author wbxie
 * 2013-11-6
 */
@SuppressWarnings("deprecation")
//@WebServlet("/ws/chat")
public class ChatWebSocketServlet extends WebSocketServlet {
    private final Map<Integer, WsOutbound> map = new HashMap<Integer, WsOutbound>();

    /**
     * 
     */
    private static final long serialVersionUID = -1058445282919079067L;

    @Override
    protected StreamInbound createWebSocketInbound(String arg0, HttpServletRequest request) {
        return new ChatMessageInbound();
    }

    class ChatMessageInbound extends MessageInbound {

        @Override
        protected void onOpen(WsOutbound outbound) {
            map.put(outbound.hashCode(), outbound);
            super.onOpen(outbound);
        }

        @Override
        protected void onClose(int status) {
            map.remove(getWsOutbound().hashCode());
            super.onClose(status);
        }

        @Override
        protected void onBinaryMessage(ByteBuffer buffer) throws IOException {
            // TODO Auto-generated method stub

        }

        @Override
        protected void onTextMessage(CharBuffer buffer) throws IOException {
            String msg = buffer.toString();
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
            msg = " <font color=green>匿名用户  " + sdf.format(date) + "</font><br/> " + msg;
            broadcast(msg);
        }

        private void broadcast(String msg) {
            Set<Integer> set = map.keySet();
            for (Integer integer : set) {
                WsOutbound outbound = map.get(integer);
                CharBuffer buffer = CharBuffer.wrap(msg);
                try {

                    outbound.writeTextMessage(buffer);
                    outbound.flush();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}