Spring整合DWR comet 實現無刷新 多人聊天室(2)

一、准備工作

1、 下載dwr的相關jar包

https://Java.Net/downloads/dwr/Development%20Builds/Build%20116/dwr.jar

程序中還需要spring的相關jar包

http://ebr.springsource.com/repository/app/library/version/detail?name=org.springframework.spring&version=3.0.5.RELEASE

需要的jar包如下

2、 建立一個WebProject，名稱DWRComet

在web.XML中添加dwr、spring配置如下：

<-- 加載Spring容器配置 --> 
<listener> 
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
</listener> 
   
<-- 設置Spring容器加載配置文件路徑 --> 
<context-param> 
    <param-name>contextConfigLocation</param-name> 
    <param-value>classpath*:applicationContext-*.XML</param-value> 
</context-param> 
   
<listener> 
    <listener-class>org.directwebremoting.servlet.DwrListener</listener-class> 
</listener> 
   
<servlet> 
    <servlet-name>dwr-invoker</servlet-name> 
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class> 
    <init-param> 
        <param-name>debug</param-name> 
        <param-value>true</param-value> 
    </init-param> 
          
    <-- dwr的comet控制 --> 
    <init-param> 
      <param-name>pollAndCometEnabled</param-name> 
      <param-value>true</param-value> 
    </init-param> 
</servlet> 
   
<servlet-mapping> 
    <servlet-name>dwr-invoker</servlet-name> 
    <url-pattern>/dwr/*</url-pattern> 
</servlet-mapping> 

3、 在src目錄加入applicationContext-beans.XML配置，這個配置專門配置bean對象，用來配置需要注入的對象。

<?XML version="1.0" encoding="UTF-8"?> 
<beans XMLns="http://www.springframework.org/schema/beans" 
    XMLns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
    XMLns:aop="http://www.springframework.org/schema/aop" 
    XMLns:tx="http://www.springframework.org/schema/tx"   
    XMLns:util="http://www.springframework.org/schema/util" 
    XMLns:context="http://www.springframework.org/schema/context" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans   
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
    http://www.springframework.org/schema/aop   
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd  
    http://www.springframework.org/schema/tx   
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd  
    http://www.springframework.org/schema/util   
    http://www.springframework.org/schema/util/spring-util-3.0.xsd  
    http://www.springframework.org/schema/context   
    http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 
</beans> 

<?XML version="1.0" encoding="UTF-8"?> 
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd"> 
<dwr> 
</dwr> 

以上的准備基本完畢，下面來完成無刷新聊天室代碼