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OmniFaces FullAjaxExceptionHandler展示柜中充實了這個問題。
基本上，您需要創(chuàng)建一個定制，ExceptionHandler因為標準JSF不會提供一個定制的定制（至少不是明智的選擇）。在其中，您將可以接觸Exception引起所有麻煩的實例。
這是一個啟動示例：
public class YourExceptionHandler extends ExceptionHandlerWrapper {
private ExceptionHandler wrapped;
public YourExceptionHandler(ExceptionHandler wrapped) {
this.wrapped = wrapped;
}
@Override
public void handle() throws FacesException {
FacesContext facesContext = FacesContext.getCurrentInstance();
for (Iterator<ExceptionQueuedEvent> iter = getUnhandledExceptionQueuedEvents().iterator(); iter.hasNext();) {
Throwable exception = iter.next().getContext().getException(); // There it is!
// Now do your thing with it. This example implementation merely prints the stack trace.
exception.printStackTrace();
// You could redirect to an error page (bad practice).
// Or you could render a full error page (as OmniFaces does).
// Or you could show a FATAL faces message.
// Or you could trigger an oncomplete script.
// etc..
}
getWrapped().handle();
}
@Override
public ExceptionHandler getWrapped() {
return wrapped;
}
}
為了使其運行，請ExceptionHandlerFactory如下創(chuàng)建一個自定義：
public class YourExceptionHandlerFactory extends ExceptionHandlerFactory {
private ExceptionHandlerFactory parent;
public YourExceptionHandlerFactory(ExceptionHandlerFactory parent) {
this.parent = parent;
}
@Override
public ExceptionHandler getExceptionHandler() {
return new YourExceptionHandler(parent.getExceptionHandler());
}
}
需要進行以下注冊faces-config.xml：
<factory>
<exception-handler-factory>com.example.YourExceptionHandlerFactory</exception-handler-factory>
</factory>
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