Struts简易计算器:Action

package com.bjpowernode.struts;

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

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class CalAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		CalActionForm calForm = (CalActionForm)form;
		int value1 = calForm.getValue1();
		String flag = calForm.getFlag();
		int value2 = calForm.getValue2();
		
		int result = 0;
		try {
			if ("+".equals(flag)) {
				result = value1 + value2;
			}else if ("-".equals(flag)) {
				result = value1 - value2;
			}else if ("*".equals(flag)) {
				result = value1 * value2;
			}else if ("/".equals(flag)) {
				result = value1 / value2;
			}
			request.setAttribute("result", result);
			return mapping.findForward("success");
		}catch(Exception e) {
			e.printStackTrace();
		}		
		return mapping.findForward("error");
	}

	
}