Jetty+Dojo+Tomcat的Comet学习笔记-HelloWorld

原創

Garfier

2020-02-25 01:04

编程环境及配置：

Eclipse3.3 + tomcat 6.0 + dojo + jetty 6.1.9

主要讲讲jetty。

“Jetty 是一个开源的servlet容器，它为基于Java的web内容，例如JSP和servlet提供运行环境。Jetty是使用Java语言编写的，它的 API以一组JAR包的形式发布。开发人员可以将Jetty容器实例化成一个对象，可以迅速为一些独立运行（stand-alone）的Java应用提供网络和web连接。”

Jetty里面含有实现comet技术的包。通过在Eclipse+tomcat编程环境中添加扩展jar文件的方式即可快速实现上述编程环境的配置。

首先下载jetty-6.1.9.zip（可到）
在他的/lib文件夹下面有我们所需要的所有的jar文件，找到jetty-util-6.1.9.jar，jetty-6.1.9.jar，servlet-api-2.5-6.1.9.jar以及在/lib/cometd下面的cometd-bayeux-6.1.9.jar，cometd-api-0.9.20080221.jar，将他们一并导入到eclipse的工程当中。
将jetty-6.1.9/contrib/cometd/bayeux/src/main/java下面的org文件夹拷贝至工程的src目录中

HelloWorld

编写HelloWorld.java

package cn.ict.net.lx.comet; import java.io.IOException; import java.util.HashMap; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import dojox.cometd.Bayeux; import dojox.cometd.Channel; /** * Servlet implementation class for Servlet: HelloWorld * */ public class HelloWorld extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { static final long serialVersionUID = 1L; /* (non-Java-doc) * @see javax.servlet.http.HttpServlet#HttpServlet() */ public HelloWorld() { super(); } /* (non-Java-doc) * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub //response.getWriter().println("Hello"); for (int i=0; i < 100; i++) publish(); } /* (non-Java-doc) * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub publish(); } public void publish(){ Bayeux b = (Bayeux)getServletConfig().getServletContext().getAttribute(Bayeux.DOJOX_COMETD_BAYEUX); Channel c = b.getChannel("/hello/world", false); Map<String, Object> message = new HashMap<String, Object>(); message.put("test", "jsp: hello world"); c.publish(b.newClient("server_user", null), message, "new server message"); } }

配置web工程的web.xml如下

<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>dojoSrc</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>hello</servlet-name> <servlet-class> cn.ict.net.lx.comet.HelloWorld </servlet-class> </servlet> <servlet-mapping> <servlet-name>hello</servlet-name> <url-pattern>/hello/*</url-pattern> </servlet-mapping>  <servlet> <servlet-name>cometd</servlet-name> <servlet-class> org.mortbay.cometd.continuation.ContinuationCometdServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet>  <servlet> <description> </description> <display-name> HelloWorld</display-name> <servlet-name>HelloWorld</servlet-name> <servlet-class> cn.ict.net.lx.comet.HelloWorld</servlet-class> </servlet>  <servlet-mapping> <servlet-name>cometd</servlet-name> <url-pattern>/cometd/*</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>HelloWorld</servlet-name> <url-pattern>/HelloWorld</url-pattern> </servlet-mapping> </web-app>

编写hello.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Comet Hello World</title> <mce:script type="text/javascript" src="../dojo/dojo/dojo.js" mce_src="dojo/dojo/dojo.js" djConfig="parseOnLoad:true"></mce:script> <mce:script type="text/javascript"></mce:script> </head> <body> <input type="button" οnclick="dojox.cometd.publish('/hello/world', { test: 'hello world' } )" value="Click Me!"> </body> </html>

分别使用IE/Firefox/Chrome访问页面hello.html：

然后，使用浏览器访问已经写好的Servlet - HelloWorld：http://localhost:8080/dojoSrc/HelloWorld

最终各浏览器的结果如图：

2010-10-15 11:21:09

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