exceptionhandleraction.java

来自「jGossip是一个简单而功能强大的Java论坛软件（消息板）」· Java 代码 · 共 91 行

/*
 * $Id: ExceptionHandlerAction.java,v 1.2 2004/05/31 12:00:08 bel70 Exp $
 *
 * ***** BEGIN LICENSE BLOCK *****
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in 
 * compliance with the License. You may obtain a copy of the License 
 * at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and 
 * limitations under the License.
 *
 * The Original Code is JGossip forum code.
 *
 * The Initial Developer of the Original Code is the JResearch, Org. 
 * Portions created by the Initial Developer are Copyright (C) 2004 
 * the Initial Developer. All Rights Reserved. 
 * 
 * Contributor(s): 
 *              Dmitriy Belov <[e-mail]>
 *               .
 * * ***** END LICENSE BLOCK ***** */
/*
 * Created on 31.05.2004
 *
 */
package org.jresearch.gossip.actions;

import java.io.PrintWriter;
import java.io.StringWriter;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ExceptionHandler;
import org.apache.struts.config.ExceptionConfig;
import org.jresearch.gossip.IConst;
import org.jresearch.gossip.exception.SystemException;

/**
 * @author Dmitry Belov
 *  
 */
public class ExceptionHandlerAction extends ExceptionHandler {

    private Log log = LogFactory.getLog(ExceptionHandlerAction.class);

    /* (non-Javadoc)
     * @see org.apache.struts.action.ExceptionHandler#execute(java.lang.Exception, org.apache.struts.config.ExceptionConfig, org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public ActionForward execute(Exception ex, ExceptionConfig econf,
            ActionMapping mapping, ActionForm formInstance,
            HttpServletRequest request, HttpServletResponse response)
            throws ServletException {
        ActionForward forward = super.execute(ex, econf, mapping, formInstance,
                request, response);
        StringBuffer message = new StringBuffer();
        if (ex instanceof SystemException) {
            SystemException se = (SystemException) ex;
            if (se.getNestedException() == null) {
                message.append(se.getTrace());
            } else {
                Exception e = se.getNestedException();
                message.append(e.getMessage());
                message.append("\n");
                message.append(se.getTrace());
            }
        } else {
            message.append(ex.getMessage());
            ex.printStackTrace();
        }
        logException(ex);
        request.setAttribute(IConst.CONTEXT.SYSTEM_EXCEPTION_MESSAGE, message
                .toString());
        return forward;
    }

    protected void logException(Exception ex) {
        StringWriter sw = new StringWriter();
        ex.printStackTrace(new PrintWriter(sw));
        log.error(sw.toString());
    }
}