systemexceptionhandler.java

这是一个jbpm的高级应用,是一个oa工作流的系统,里面用到了spring,hibernate技术等.实为学习jbpm的好资料!

package com.bjsxt.oa.web;

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.log4j.Logger;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ExceptionHandler;
import org.apache.struts.config.ExceptionConfig;

import com.bjsxt.oa.managers.SystemException;

/**
 * 通用异常处理器
 * @author Administrator
 *
 */
public class SystemExceptionHandler extends ExceptionHandler {

	//直接使用Log4j的API	
	//private static Logger logger = Logger.getLogger(SystemExceptionHandler.class);
	
	//使用commons-log来记录日志
	private static Log logger = LogFactory.getLog(SystemExceptionHandler.class);
	
	@Override
	public ActionForward execute(Exception ex, ExceptionConfig ae, ActionMapping mapping, ActionForm formInstance, HttpServletRequest request, HttpServletResponse response) throws ServletException {
		
		ActionForward forward = null;
		
        if (ae.getPath() != null) {
            forward = new ActionForward(ae.getPath());
        } else {
            forward = mapping.getInputForward();
        }
        
        //打印异常消息
        ex.printStackTrace();
        logger.error(ex.getMessage(), ex);
        
        if(ex instanceof SystemException){
        	
        	SystemException se = (SystemException)ex;
        	
        	//取出key值
        	String key = se.getKey();
        	
        	//创建异常消息
        	ActionMessage error = null;
        	
        	if(key == null){
        		
        		//ae.getKey() = errors.detail
        		error = new ActionMessage(ae.getKey(),se.getMessage());
        	}else{
        		error = new ActionMessage(key);
        	}
        	
        	//将异常消息保存到request中
        	storeException(request, key, error, forward, "request");
        	
        	//不再做处理，直接返回错误页面
        	return forward;
        }
		
		return super.execute(ex, ae, mapping, formInstance, request, response);
	}

}