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锁定老帖子 主题:Dwr反转Ajax
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发表时间:2007-11-08
<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> <init-param> <param-name>pollAndCometEnabled</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>crossDomainSessionSecurity</param-name> <param-value>false</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> pollAndCometEnabled表示开启“推”模式,crossDomainSessionSecurity表示允许跨域 2. 与web.xml同一目录增加dwr.xml的配置文件: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 0.4//EN" "http://www.getahead.ltd.uk/dwr/dwr.dtd"> <dwr> <allow> <create creator="new" javascript="AlarmRegister" scope="session"> <param name="class" value="com.zg.alarm.AlarmRegister" /> <include method="register" /> </create> </allow> </dwr> com.zg.alarm.AlarmRegister是页面中调用向服务器注册接收“alarmchange”事件的类; <include method="register" />是该类公布出来提供给前台页面调用的方法。 3. 前台页面: Bottom.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=gb2312"> <title>无标题文档</title> <script type='text/javascript' src='/common/js/util.js'></script> <script type="text/javascript" src="/dwr/engine.js"></script> <script type='text/javascript' src='/dwr/interface/AlarmRegister.js'> </script> <SCRIPT> <!-- function showAlarm(alarmType){ var alarm = $("alm"); alarm.innerHTML="<MARQUEE DIRECTION=left BEHAVIOR=SCROLL SCROLLAMOUNT=10 SCROLLDELAY=200 LOOP=1><font size=3pt>告警发生变化</font></MARQUEE>"; //getMsg(); } //--> </SCRIPT> </head> <body onload="DWREngine.setActiveReverseAjax(true);AlarmRegister.register();"> <div id="alm"> </div> </body> </html> <script type='text/javascript' src='/common/js/util.js'></script> <script type="text/javascript" src="/dwr/engine.js"></script>是需要导入的javascript文件 AlarmRegister是在dwr.xml中<create creator="new" javascript="AlarmRegister" scope="session">公布出来的,它会由dwr框架为我们自动生成。 页面中showAlarm方法负责显示告警发生变化,当后台接收到事件时会调用这一方法。 在本页面初始化时调用DWREngine.setActiveReverseAjax(true),表示开启ajax反转功能。AlarmRegister.register()会调用到后台的com.zg.alarm.AlarmRegister类的register方法。 4. 事件注册类: AlarmRegister.java public class AlarmRegister { public AlarmRegister() { } public void register(){ WebContext wctx = WebContextFactory.get(); final ScriptSession scriptSession = wctx.getScriptSession(); OmlServerManager.getInstance().registerEventProcess(new AlarmEventProcessor(scriptSession),"alarmchange"); } } 向OmlServerManager注册alarmchange事件,注意的是必须把scriptSession传给事件相应类AlarmEventProcessor。 5. 事件相应类: AlarmEventProcessor.java public class AlarmEventProcessor implements EventProcessorInterface{ private ScriptSession scriptSession; public AlarmEventProcessor(ScriptSession scriptSession) { this.scriptSession=scriptSession; } public void processEventMsg(String string) { System.out.println(string); } public void processEventMsg(OmlPDU omlPDU) { ScriptBuffer scriptBuffer = new ScriptBuffer(); scriptBuffer.appendScript("showAlarm(") .appendData("123") .appendScript(");"); scriptSession.addScript(scriptBuffer); } } scriptBuffer.appendScript("showAlarm(") .appendData("123") .appendScript(");"); 这一代码将产生对前台页面中javascript showAlarm方法的调用 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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发表时间:2008-07-11
这贴很少经典,dwr推模式。
能否将代码贴全罗 |
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