如何在url中使用cid处理过期会话

Question

我使用ConversationScoped bean作为我的JSF支持bean。有时，网址会有？cid=XX。然而，当会话范围的bean过期时，这通常会导致问题。它在浏览器中显示了一个500错误，在服务器日志中显示了org.boss.weld.cext.ContextNotActiveException。我已将以下内容放入我的web.xml 中

<error-page>
    <exception-type>org.jboss.weld.context.ContextNotActiveException</exception-type>
    <location>/faces/index.xhtml</location>
</error-page>
<error-page>
    <error-code>500</error-code>   
    <location>/faces/index.xhtml</location>
</error-page>

它不起作用。当url有一个错误的cid时，它会显示500错误。我该怎么修？

Answer 1

您可以创建自己的"ViewExpiredExceptionHandler"并重定向到所需页面。

像这样的东西应该起作用：

import java.util.Iterator;
import org.jboss.weld.context.NonexistentConversationException;
import javax.faces.FacesException;
import javax.faces.application.ViewExpiredException;
import javax.faces.context.ExceptionHandler;
import javax.faces.context.ExceptionHandlerWrapper;
import javax.faces.context.FacesContext;
import javax.faces.event.ExceptionQueuedEvent;
import javax.faces.event.ExceptionQueuedEventContext;
public class ViewExpiredExceptionHandler
        extends ExceptionHandlerWrapper {
    private ExceptionHandler wrapped;
    public ViewExpiredExceptionHandler(ExceptionHandler wrapped) {
        this.wrapped = wrapped;
    }
    @Override
    public ExceptionHandler getWrapped() {
        return this.wrapped;
    }
    @Override
    public void handle()
            throws FacesException {
        for (Iterator<ExceptionQueuedEvent> i =
                getUnhandledExceptionQueuedEvents().iterator();
                i.hasNext();) {
            ExceptionQueuedEvent event = i.next();
            ExceptionQueuedEventContext context =
                    (ExceptionQueuedEventContext) event.getSource();
            Throwable t = context.getException();
            if (t instanceof ViewExpiredException
                    || t instanceof NonexistentConversationException) {
                FacesContext fc = FacesContext.getCurrentInstance();
                try {
                    if (!fc.getExternalContext().isResponseCommitted()) {
                        fc.getExternalContext().redirect("index.xhtml");
                    }
                    fc.renderResponse();
                    break;
                } catch (Exception ex) {
                    throw new FacesException(ex);
                } finally {
                    i.remove();
                }
            }
        }
        getWrapped().handle();
    }
}

创建一个ViewExpiredExceptionHandlerFactory，如下所示：

import javax.faces.context.ExceptionHandler;
import javax.faces.context.ExceptionHandlerFactory;
public class ViewExpiredExceptionHandlerFactory
    extends ExceptionHandlerFactory {
    private ExceptionHandlerFactory parent;
    public ViewExpiredExceptionHandlerFactory(
            ExceptionHandlerFactory parent) {
        this.parent = parent;
    }
    @Override public ExceptionHandler getExceptionHandler() {
        ExceptionHandler result = parent.getExceptionHandler();  
        result = new ViewExpiredExceptionHandler(result);    
        return result;  
    }   
}

将其添加到您的faces-config.xml:

<factory>
    <exception-handler-factory>
        com.yourcode.ViewExpiredExceptionHandlerFactory
    </exception-handler-factory>
</factory>