baseappdispatchaction.java

java下面的异常框架

package org.expframework.samples.struts;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import org.expframework.data.ExceptionDTO;
import org.expframework.data.ExceptionDisplayDTO;
import org.expframework.exceptionhandler.ExceptionHandlerFactory;
import org.expframework.exceptionhandler.ExceptionUtil;
import org.expframework.exceptionhandler.IExceptionHandler;
import org.expframework.exceptions.BaseAppException;

public abstract class BaseAppDispatchAction extends DispatchAction {

    protected static ThreadLocal expDisplayDetails = new ThreadLocal();

    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        HttpSession session = request.getSession(false);
        String userId = (String) session.getAttribute("userId");
        try {
            String actionMethod = request.getParameter(mapping.getParameter());
            return dispatchMethod(mapping, form, request, response,
                    actionMethod);
        } catch (BaseAppException Ex) {
            ExceptionDisplayDTO expDTO = (ExceptionDisplayDTO) expDisplayDetails
                    .get();
            IExceptionHandler expHandler = ExceptionHandlerFactory
                    .getInstance().create();
            ExceptionDTO exDto = expHandler.handleException(
                    expDTO.getContext(), userId, Ex);
            ActionErrors errors = new ActionErrors();
            errors.add(ActionErrors.GLOBAL_ERROR, new ActionError(exDto
                    .getMessageCode()));
            saveErrors(request, errors);
            return mapping.findForward(expDTO.getActionForwardName());
        } catch (Exception ex) {
            ExceptionUtil.logException(this.getClass(), ex, userId);
            throw ex;
        } finally {
            expDisplayDetails.set(null);
        }
    }
}