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基于J2EE的电子商务网站实例解析 |
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时间: 2006-05-24 来自：天极开发 |
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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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