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//Annotation configuration dwr servletprivate void initializeDwrServlet(ServletContext container) {DwrServlet dwrServlet = new DwrServlet(); ServletRegistration.Dynamic dynamic = container.addServlet( "dwr-invoker" , dwrServlet ); dynamic.setLoadOnStartup( 2 ); dynamic.setInitParameter( "debug" , "true" ); dynamic.setInitParameter( "pollAndCometEnabled" , "true" ); dynamic.setInitParameter( "activeReverseAjaxEnabled" , "true" ); dynamic.setInitParameter( "maxWaitAfterWrite" , "1800000" ); dynamic.setInitParameter( "disconnectedTime" , "60000" ); dynamic.setInitParameter( "classes" , dwrAnnotationClasssConfiguration()); dynamic.addMapping( "/dwr/*" );} // Configure Dwr Annotation Classes,comma separatedprivate String dwrAnnotationClasssConfiguration() { StringBuffer config = new StringBuffer(); config.append( "com.g360.bean.reconsole.opcost.AnnualOpCostRequestController" ); config.append( "," );config.append( "com.g360.bean.security.SessionExpiredParam" ); return config.toString();} |
上面我的配置是基于注解版的Dwr Servlet配置(将web.xml里面的servlet配置转换为了纯Java代码配置),当然也包括前端和后端直接交互的类(
com.g360.bean.reconsole.opcost.AnnualOpCostRequestController,com.g360.bean.security.SessionExpiredParam
)也是使用注解配置的(Dwr注解配置,包括@RemoteProxy,@RemoteMethod),这对于有些注解配置基础的同学来说可能比较容易看懂,对于初次接触的有什么不懂的可以给我留言哦;
com.g360.bean.security.SessionExpiredParam的注解配置如下所示:
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@Component ( "sessionExpiredParam" ) @RemoteProxy (creator = SpringCreator. class , scope = ScriptScope.APPLICATION, name = "remote" , creatorParams = @Param (name = "beanName" , value = "sessionExpiredParam" )) public class SessionExpiredParam{ private static final Logger LOGGER = LoggerFactory.getLogger(SessionExpiredParam. class ); public boolean isSessionExpire (String sessionId) { return null == ConstantCacheService.getCacheConstant(sessionId); } @RemoteMethod public void setEnableDwrUpdate(String sessionId) { ScriptSession scriptSession = WebContextFactory.get().getScriptSession(); String jsessionId = scriptSession.getHttpSessionId(); String dwrSessionId = scriptSession.getId(); LOGGER.info(String.format( "set jsessionId = [%s],dwrsession = [%s] push enabled" ,jsessionId,dwrSessionId)); ConstantCacheService.putCacheConstant(Constants.PUSH_ID+jsessionId, dwrSessionId); } } |
这就是相当于dwr.xml配置文件中如下所示:
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<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd" ><dwr> <allow> <create creator= "new" javascript= "remote" scope= "application" > <param name= "class" value= "com.g360.bean.security.SessionExpiredParam" /> </create> </allow></dwr> |
对于com.g360.bean.reconsole.opcost.AnnualOpCostRequestController来说道理一样,这里就不多做说明了;
对于使用DwrServlet来说要使用纯注解配置(不使用dwr.xml)一定要注意在初始化参数时一定要配置 classes这个参数,而且这个参数是这个注解类的全路径名,有多个的话就使用逗号分隔,这个是特别重要的哦,因为Dwr3.0好像还不支持包扫描,不知道是需要什么配置才能实现还是怎么的,如果有哪位仁兄正好看见,也正好知道的话请留言麻烦告诉一下,感激不尽啊!欢迎大家有什么不明白的地方或者有什么不对的地方,请随时留言;