DWR3.0可以通过
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//得到所有ScriptSessionCollection<ScriptSession> sessions = Browser.getTargetSessions(); |
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Collection pages = webContext.getScriptSessionsByPage("/yourPage.jsp"); |
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package sugar.dwr;import java.util.Collection;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpSession;import org.directwebremoting.ScriptSession;import org.directwebremoting.WebContext;import org.directwebremoting.WebContextFactory;import org.directwebremoting.event.ScriptSessionEvent;import org.directwebremoting.event.ScriptSessionListener;public class DWRScriptSessionListener implements ScriptSessionListener { //维护一个Map key为session的Id， value为ScriptSession对象 public static final Map<String, ScriptSession> scriptSessionMap = new HashMap<String, ScriptSession>(); /** * ScriptSession创建事件 */ public void sessionCreated(ScriptSessionEvent event) { WebContext webContext = WebContextFactory. get(); HttpSession session = webContext.getSession(); ScriptSession scriptSession = event.getSession(); scriptSessionMap.put(session.getId(), scriptSession); //添加scriptSession System. out.println( "session: " + session.getId() + " scriptSession: " + scriptSession.getId() + "is created!"); } /** * ScriptSession销毁事件 */ public void sessionDestroyed(ScriptSessionEvent event) { WebContext webContext = WebContextFactory. get(); HttpSession session = webContext.getSession(); ScriptSession scriptSession = scriptSessionMap.remove(session.getId()); //移除scriptSession System. out.println( "session: " + session.getId() + " scriptSession: " + scriptSession.getId() + "is destroyed!"); } /** * 获取所有ScriptSession */ public static Collection<ScriptSession> getScriptSessions(){ return scriptSessionMap.values(); }} |
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package sugar.dwr;import org.directwebremoting.impl.DefaultScriptSessionManager;public class DWRScriptSessionManager extends DefaultScriptSessionManager { public DWRScriptSessionManager(){ //绑定一个ScriptSession增加销毁事件的监听器 this.addScriptSessionListener( new DWRScriptSessionListener()); System. out.println( "bind DWRScriptSessionListener"); }} |
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<init-param> <param-name >org.directwebremoting.extend.ScriptSessionManager </param-name> <param-value >sugar.dwr.DWRScriptSessionManager </param-value></init-param> |
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//得到所有ScriptSessionCollection<ScriptSession> sessions = DWRScriptSessionListener.getScriptSessions(); |
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//执行推送Browser.withAllSessionsFiltered(filter, run); //注意这里调用了有filter功能的方法 |
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public void send(final String content){ //过滤器 ScriptSessionFilter filter = new ScriptSessionFilter() { public boolean match(ScriptSession scriptSession) { String tag = (String)scriptSession.getAttribute("tag" ); System. out.println(tag); return "receiverTag" .equals(tag); } }; Runnable run = new Runnable(){ private ScriptBuffer script = new ScriptBuffer(); public void run() { //设置要调用的 js及参数 script.appendCall( "show", content); //得到所有ScriptSession Collection<ScriptSession> sessions = DWRScriptSessionListener.getScriptSessions(); //遍历每一个ScriptSession for (ScriptSession scriptSession : sessions){ scriptSession.addScript( script); } } }; //执行推送 Browser. withAllSessionsFiltered(filter, run); //注意这里调用了有filter功能的方法} |
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public void onPageLoad(final String tag){ //获取当前的ScriptSession ScriptSession scriptSession = WebContextFactory.get().getScriptSession(); scriptSession.setAttribute( "tag", tag); System. out.println( "setAttribute");} |
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<script type= "text/javascript"> //这个方法用来启动该页面的ReverseAjax功能 dwr.engine.setActiveReverseAjax( true); //设置在页面关闭时，通知服务端销毁会话 dwr.engine.setNotifyServerOnPageUnload( true); var tag = "receiverTag"; //自定义一个标签 messagePush.onPageLoad(tag); //这个函数是提供给后台推送的时候 调用的 function show(content){ $( "#content").text(content); } </script > |
DWR3.0框架入门（3） —— ScriptSession的维护及优化
原文：http://www.cnblogs.com/-blog/p/5180980.html