我尝试过体验 JSF 2.3 的新特性,其中一个吸引人的是 websocket。
我已经从 mojarra 测试和 JSF 2.3 特定的@Push
javadoc 中阅读了一些示例代码。
并且在使用f:websocket
和f:ajax
.
facelets 模板是:
<h:panelGroup id="messagePanel" layout="block">
<ul>
<ui:repeat value="#{ajaxBean.messages}" var="m">
<li>#{m}</li>
</ui:repeat>
</ul>
</h:panelGroup>
<h:form id="form">
<h:commandButton
id="sendMessage"
action="#{ajaxBean.sendMessage()}"
value="Send Ajax Message">
<f:ajax/>
</h:commandButton>
</h:form>
<h:form>
<f:websocket channel="ajaxChannel" scope="view">
<f:ajax event="ajaxEvent" render=":messagePanel" />
</f:websocket>
</h:form>
<h:form>
<f:websocket channel="ajaxListenerChannel" scope="view">
<f:ajax event="ajaxListenerEvent" listener="#{ajaxBean.ajaxPushed}" render=":messagePanel" />
</f:websocket>
</h:form>
<f:websocket channel="commandScriptChannel" scope="view" onmessage="onCommandScript"/>
<h:form>
<h:commandScript name="onCommandScript" action="#{ajaxBean.commandScriptExecuted()}" render=":messagePanel"/>
</h:form>
后端bean是:
@ViewScoped
@Named("ajaxBean")
public class AjaxBean implements Serializable {
private static final Logger LOG = Logger.getLogger(AjaxBean.class.getName());
@Inject
@Push
PushContext ajaxChannel;
@Inject
@Push
PushContext ajaxListenerChannel;
@Inject
@Push
PushContext commandScriptChannel;
private List<String> messages = new ArrayList<>();
public void ajaxPushed(AjaxBehaviorEvent e) throws AbortProcessingException{
LOG.log(Level.INFO, "ajax pushed: " + e.toString());
messages.add("ajaxListenerEvent is sent at: " + LocalDateTime.now());
ajaxListenerChannel.send("ajaxListenerEvent");
}
public void commandScriptExecuted() {
LOG.log(Level.INFO, "commandScriptExecuted pushed.");
messages.add("commandScriptExecuted message is sent at: " + LocalDateTime.now());
commandScriptChannel.send("onCommandScript");
}
public void sendMessage() {
// LOG.log(Level.INFO, "ajax pushed by button: " + e.toString());
messages.add("ajaxEvent is sent at: " + LocalDateTime.now());
ajaxChannel.send("ajaxEvent");
}
public List<String> getMessages() {
return messages;
}
public void setMessages(List<String> messages) {
this.messages = messages;
}
}
结果是第一个按钮可以根据需要触发ajax输出。但是带有监听器的 f:ajax 不起作用,并且 h:commandScript 在这里也不起作用。
如何纠正这些?