Tomcat 6 AIO支持Comet的示例
?源地址链接：http://tomcat.apache.org/tomcat-6.0-doc/aio.html?
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Tomcat 6 AIO支持Comet的sample代码：
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public class ChatServlet extends HttpServlet implements CometProcessor { protected ArrayList<HttpServletResponse> connections = new ArrayList<HttpServletResponse>(); protected MessageSender messageSender = null; public void init() throws ServletException { messageSender = new MessageSender(); Thread messageSenderThread = new Thread(messageSender, "MessageSender[" + getServletContext().getContextPath() + "]"); messageSenderThread.setDaemon(true); messageSenderThread.start(); } public void destroy() { connections.clear(); messageSender.stop(); messageSender = null; } /** * Process the given Comet event. * * @param event The Comet event that will be processed * @throws IOException * @throws ServletException */ public void event(CometEvent event) throws IOException, ServletException { HttpServletRequest request = event.getHttpServletRequest(); HttpServletResponse response = event.getHttpServletResponse(); if (event.getEventType() == CometEvent.EventType.BEGIN) { log("Begin for session: " + request.getSession(true).getId()); PrintWriter writer = response.getWriter(); writer.println("<!doctype html public \"-//w3c//dtd html 4.0 transitional//en\">"); writer.println("<head><title>JSP Chat</title></head><body bgcolor=\"#FFFFFF\">"); writer.flush(); synchronized(connections) { connections.add(response); } } else if (event.getEventType() == CometEvent.EventType.ERROR) { log("Error for session: " + request.getSession(true).getId()); synchronized(connections) { connections.remove(response); } event.close(); } else if (event.getEventType() == CometEvent.EventType.END) { log("End for session: " + request.getSession(true).getId()); synchronized(connections) { connections.remove(response); } PrintWriter writer = response.getWriter(); writer.println("</body></html>"); event.close(); } else if (event.getEventType() == CometEvent.EventType.READ) { InputStream is = request.getInputStream(); byte[] buf = new byte[512]; do { int n = is.read(buf); //can throw an IOException if (n > 0) { log("Read " + n + " bytes: " + new String(buf, 0, n) + " for session: " + request.getSession(true).getId()); } else if (n < 0) { error(event, request, response); return; } } while (is.available() > 0); } } public class MessageSender implements Runnable { protected boolean running = true; protected ArrayList<String> messages = new ArrayList<String>(); public MessageSender() { } public void stop() { running = false; } /** * Add message for sending. */ public void send(String user, String message) { synchronized (messages) { messages.add("[" + user + "]: " + message); messages.notify(); } } public void run() { while (running) { if (messages.size() == 0) { try { synchronized (messages) { messages.wait(); } } catch (InterruptedException e) { // Ignore } } synchronized (connections) { String[] pendingMessages = null; synchronized (messages) { pendingMessages = messages.toArray(new String[0]); messages.clear(); } // Send any pending message on all the open connections for (int i = 0; i < connections.size(); i++) { try { PrintWriter writer = connections.get(i).getWriter(); for (int j = 0; j < pendingMessages.length; j++) { writer.println(pendingMessages[j] + "<br>"); } writer.flush(); } catch (IOException e) { log("IOExeption sending message", e); } } } } } }} ?
??? 需要写另一个方法来调用send()，传入message，通知messageSender线程来发送消息。
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