glassfish服务器推送技术

昨天就了一下glassfish例子 ,与大家分享一下

新建一个servlet:

package org.comet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sun.enterprise.web.connector.grizzly.comet.CometContext;
import com.sun.enterprise.web.connector.grizzly.comet.CometEngine;

public class CometChat extends HttpServlet
{

	/**
	 * Constructor of the object.
	 */
	CometEngine engine = null;
	CometContext metaContext = null;

	public CometChat()
	{
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy()
	{
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	@Override
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		CometResponseHandler handler = null;

		response.setContentType("text/plain");
		response.setStatus(HttpServletResponse.SC_OK);
		if(request.getRequestURI().equals(request.getContextPath()+"/servlet/CometChat")){
			handler = new CometResponseHandler(request.getContextPath()+"/servlet/CometChat");
			handler.attach(response);
			metaContext.addCometHandler(handler);
		}

		PrintWriter writer = response.getWriter();
		writer.flush();
		writer.println("---START---");
		writer.flush();

	}


	/**
	 * Initialization of the servlet. <br>
	 * 
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException
	{
		// Put your code here
		super.init();
		engine = CometEngine.getEngine();
		metaContext = engine.register("/servlet/CometChat");

		Thread t = new Thread()
		{
			public int i = 0;

			public void run()
			{
				while (true)
				{

					try
					{
						Thread.sleep(10000);
						metaContext.notify(new Integer(i++));
					}
					catch (IOException e)
					{
						e.printStackTrace();
					}
					catch (InterruptedException e)
					{
						e.printStackTrace();
						return;
					}
				}
			}
		};

		t.start();

	}

}

 然后有一个JavaBean

package org.comet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

import com.sun.enterprise.web.connector.grizzly.comet.CometContext;
import com.sun.enterprise.web.connector.grizzly.comet.CometEngine;
import com.sun.enterprise.web.connector.grizzly.comet.CometEvent;
import com.sun.enterprise.web.connector.grizzly.comet.CometHandler;

public class CometResponseHandler implements CometHandler<HttpServletResponse>
{
	private HttpServletResponse httpServletResponse;
	private String contextPath = null;

	public CometResponseHandler(String contextPath)
	{

	}

	public void attach(HttpServletResponse httpServletResponse)
	{
		this.httpServletResponse = httpServletResponse;
	}

	public void onEvent(CometEvent event) throws IOException
	{
		System.out.println("==== onEvent =====");
		PrintWriter printWriter = httpServletResponse.getWriter();
		printWriter.println("Handler:" + this.toString() + " - event{type:\"" + event.getType() + "\",\""
				+ event.attachment().toString() + "\"} IP=");
		printWriter.flush();
	}

	public void onInitialize(CometEvent event) throws IOException
	{
		System.out.println("==== onInitialize =====");
	}

	public void onTerminate(CometEvent event) throws IOException
	{
		System.out.println("==== onTerminate =====");
		onInterrupt(event);
	}

	public void onInterrupt(CometEvent event) throws IOException
	{
		System.out.println("==== onInterrupt =====");
		CometEngine cometEngine = CometEngine.getEngine();
		CometContext cometContext = cometEngine.getCometContext(contextPath);
		cometContext.removeCometHandler(this);
	}



}

 deploy在glassfish吧

这其实是http协议的一个特性，估计是被glassfish封装了吧
但是移植怎么办

目前这类的方案都是不可移植，也其它的服务器已经移植了Comet。如resin等。
Servlet 3.0应该会添加这方面的等价物。

如果移植的确不行,但是你可以考虑使用lightStreamer,也是一个comet开发包,它也支持.net平台

我想问你com.sun.enterprise.web.connector.grizzly.comet的API说明文档在哪儿可以下到

很好，我们公司也在考虑换glassfish，就是为了推..