基于J2EE架构的电子商务网站实例解析(3) |
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http://www.sina.com.cn 2006年05月24日 15:27 天极yesky |
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3. 定制后台Action
根据MVC的精神,View和Model设计好之后应该是将开发重点转移到控制器的开发上。控制器是根据用户行为进行响应的处理模块,比如用户通过首页的搜索条对服务信息进行检索,这时,web服务中的SearchToTradeEntityAction(对应SearchToTradeEntityAction.java文件)会对用户这一动作进行处理。以下对这一Action进行详细分析:
package com.routease.action.totradeentity; import java.util.Collection; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.beanutils.PropertyUtils; import org.apache.commons.lang.StringUtils; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import com.routease.action.PagingAction; import com.routease.action.helper.UserHelper; import com.routease.db.dao.DataSource; import com.routease.db.dao.totradeentity.SearchingCriteria; import com.routease.db.dao.totradeentity.ToTradeEntityDAO; import com.routease.db.util.Constants; import com.routease.db.util.Page; public class SearchToTradeEntityAction extends PagingAction { public SearchToTradeEntityAction() { super(); } // executeWithDataSource方法为该Action默认执行的方法 public ActionForward executeWithDataSource(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response, DataSource ds) throws Exception { //首先接受用户提交的表单数据 String objective = (String) PropertyUtils.getSimpleProperty(actionForm, "objective"); String keyWords = (String) PropertyUtils.getSimpleProperty(actionForm, "keyWords"); String keyWordsRange = (String) PropertyUtils.getSimpleProperty(actionForm, "keyWordsRange"); if (StringUtils.isEmpty(keyWordsRange)) { keyWordsRange = SearchingCriteria.KEY_WORDS_RANGE_NAME; } String industryLevel1 = (String) PropertyUtils.getSimpleProperty(actionForm, "industryLevel1"); String industryLevel2 = (String) PropertyUtils.getSimpleProperty(actionForm, "industryLevel2"); String startingPrice = (String) PropertyUtils.getSimpleProperty(actionForm, "startingPrice"); String endingPrice = (String) PropertyUtils.getSimpleProperty(actionForm, "endingPrice"); String city = (String) PropertyUtils.getSimpleProperty(actionForm, "city"); String province = (String) PropertyUtils.getSimpleProperty(actionForm, "province"); String startNoStr = (String) PropertyUtils.getSimpleProperty(actionForm, "startNumber"); String lengthStr = (String) PropertyUtils.getSimpleProperty(actionForm, "length"); if (StringUtils.isEmpty(startNoStr)) { startNoStr = "1"; } //根据用户提交的数据,创建查询表达式对象SC int startNumber = Integer.parseInt(startNoStr); int length = UserHelper.getPagingLength(ds, request); ToTradeEntityDAO serviceDAO = new ToTradeEntityDAO(ds); SearchingCriteria sc = new SearchingCriteria(); sc.setCity(city); sc.setProvince(province); sc.setEndingPrice(endingPrice); sc.setIndustryLevel1(industryLevel1); sc.setIndustryLevel2(industryLevel2); sc.setKeyWords(keyWords); sc.setKeyWordsRange(keyWordsRange); sc.setObjective(objective); sc.setStartingPrice(startingPrice); if (Constants.IS_TEST) { System.out.println("start of page:" + startNumber); } //提交查询对象SC,并获得查询结果集,将其结果集放入Request对象中,便于返回 Page result = serviceDAO.searchToTradeEntities(sc, startNumber, length); Collection industries = serviceDAO.findIndustryDistribution(sc); result.setSizePerPage(length); request.setAttribute(Constants.TO_TRADE_ENTITY, result); request.setAttribute("MY_INDUSTRIES",industries); request.setAttribute("MY_PAGE", result); //业务逻辑处理完毕之后,返回成功页面 return actionMapping.findForward("SUCCESS_PAGE"); } } | SearchToTradeEntityAction是一个典型的Action,由前面注解不难看出,一般Action分为三部分:
a. 接受用户表单数据
b. 处理用户表单数据
c. 返回处理结果及页面
4. 修改页面为JSP文件
凡是涉及到与用户状态相关的页面均应改造为动态页面(JSP文件),改造是在前面静态文件的基础上进行的,用服务器端返回的数据(存放在Request对象里)替换静态文本,由于这部分相对技术性不强,所以不再详细赘述了。
通过前面四部分的介绍,基本概述了如易网技术实施的主要过程,在下面的一章里介绍网站技术中的几个重要技巧。
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