购物车

IndexAction：

public class IndexAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {//查找商品表中的所有商品信息     GoodsDAO dao = new GoodsDAO();List list = dao.find();request.setAttribute("lister",list);return mapping.findForward("a");}}

ListAction：

public class ListAction extends Action {

// 将hashmap中value转到list中public static List getList(HashMap hs) {List list = new ArrayList();Iterator itr = hs.keySet().iterator();while (itr.hasNext()) {   list.add(hs.get(itr.next()));   }return list;}//优化后的getList方法public static List getList(HashMap hs) {return new ArrayList(hs.values());}

// 将点击的商品id和已经点击过的商品id数组中去比较，看是否有重复,真为有重复public static boolean isCheck_on(int[] ids, int _id) {boolean flag = false;for (int i = 0; i < ids.length; i++) {   if (ids[i] == _id) {    flag = true;   }}return flag;}

// 将新点击商品的id和list(存放在session中的allIdSumList容器)中元素的id属性比较public static void test_ListCheck(List list, int check_id, float _p,String _n) {for (int i = 0; i < list.size(); i++) {   int j = ((IdSumPriceNameDTO) list.get(i)).getId();   // 将list_sumId的第i个元素++   int k = ((IdSumPriceNameDTO) list.get(i)).getSum();   if (j == check_id) {   //相等条件则将k(商品数量)++    k++;   //session中的"allIdSumList"也随之更新，引用传参原理    ((IdSumPriceNameDTO) list.get(i)).setSum(k);    //list.remove(i);    //IdSumPriceNameDTO idSumDTO = new IdSumPriceNameDTO(j, k, _p,_n);    //将更新后的idSumDTO重新add到list中，session中的"allIdSumList"也随之更新，引用传参原理    //list.add(i, idSumDTO);   }}}// 将点击商品id和allIdSumList(session中)比较，并返回比较后的list_sumIdpublic static List getCounter_List(List _list_check, int id, HttpSession sess,   float price,String _name) {

List list_sumId = null;String flag = (String) sess.getAttribute("flags");// 执行了修改操作的条件if (flag != null) {   // 从session中获得已经修改过商品的id的数组   int[] ider = (int[]) sess.getAttribute("ider");   // 在修改操作后，在已修改商品上继续购物操作   if (isCheck_on(ider, id)) {     list_sumId = (List) sess.getAttribute("allIdSumList");   // 调用test_ListCheck方法     test_ListCheck(list_sumId,id,price,_name);    }    // 修改操作后，点击没有被修改数量过的商品   else {   // 标志位    boolean flag_c = true;    // 新点击商品id和list中历史点击记录比较    for (int i = 0; i < _list_check.size() - 1; i++) {     if (_list_check.get(i).equals(id)) {      flag_c = false;     }    }     // session中获得"allIdSumList"    list_sumId = (List) sess.getAttribute("allIdSumList");     // 新点击操作    if(flag_c){     IdSumPriceNameDTO idSumDTO = new IdSumPriceNameDTO(id, 1, price,_name);    // session中的"allIdSumList"也随之更新，引用copy     list_sumId.add(idSumDTO);     }     // 重复点击操作    else{     // 调用test_ListCheck方法     test_ListCheck(list_sumId,id,price,_name);    }   }}     // 未点击修改的操作条件else {   // session中获得"allIdSumList"   list_sumId = (List) sess.getAttribute("allIdSumList");   // 标志位   boolean flag_c = true;   // 新点击商品id和list中历史点击记录比较   for (int i = 0; i < _list_check.size() - 1; i++) {    if (_list_check.get(i).equals(id)) {     flag_c = false;    }   }   // 新点击操作   if (flag_c) {    IdSumPriceNameDTO idSumDTO = new IdSumPriceNameDTO(id, 1, price,_name);   // session中的"allIdSumList"也随之更新，引用copy    list_sumId.add(idSumDTO);   }   // 重复点击操作   else {     // 调用test_ListCheck方法     test_ListCheck(list_sumId,id,price,_name);   }}return list_sumId;}

public ActionForward execute(ActionMapping mapping, ActionForm form,   HttpServletRequest request, HttpServletResponse response)   throws Exception {// 商品编号int id = Integer.parseInt(request.getParameter("id"));GoodsDAO dao = new GoodsDAO();int goodsid = dao.findbyId(id).getId();String goodsName = dao.findbyId(id).getGoodsName();float goodsPrice = (float) dao.findbyId(id).getGoodsPrice();//set进idSumDTO IdSumPriceNameDTO idSumDTO = new IdSumPriceNameDTO();idSumDTO.setId(goodsid);idSumDTO.setGoodsName(goodsName);idSumDTO.setGoodsPrice(goodsPrice);// idSumDTO中的sum属性缺省为1idSumDTO.setAllPrices(goodsPrice);System.out.println(idSumDTO.getAllPrices());// hid做为hashmap中的keyInteger hid = Integer.valueOf(idSumDTO.getId());HttpSession sess = request.getSession();HashMap hs = (HashMap) sess.getAttribute("shops");/** *//**   * 客户第一次访问   */if (hs == null) {   //将商品id放入list中   List list = new ArrayList();   list.add(hid);   hs = new HashMap();   hs.put(hid, idSumDTO);   // jsp显示   sess.setAttribute("shop", getList(hs));   // 将hs放到session中,删除修改用   sess.setAttribute("shops", hs);   // 将list(商品id)放入session中   sess.setAttribute("ids_go", list);   // 将商品id,sum,price,name放入idSumDTO_1并置于idSum_list中   IdSumPriceNameDTO idSumDTO_1 = new IdSumPriceNameDTO(idSumDTO.getId(), idSumDTO     .getSum(), idSumDTO.getGoodsPrice(),idSumDTO.getGoodsName());   List idSum_list = new ArrayList();   idSum_list.add(idSumDTO_1);   // 将idSum_list对象至于sess中，和updateAction中的"allIdSumList"对应   sess.setAttribute("allIdSumList", idSum_list);}/** *//**   * 客户第二次以后的访问   */else {   List list_check = (List) sess.getAttribute("ids_go");   list_check.add(hid);   // list_sumId包含id,sum,price,name    List list_sumId = getCounter_List(list_check, hid, sess, goodsPrice,goodsName);   for (int i = 0; i < list_sumId.size(); i++) {    IdSumPriceNameDTO isp = new IdSumPriceNameDTO();    int a = ((IdSumPriceNameDTO) list_sumId.get(i)).getId();    isp.setId(a);    int b = ((IdSumPriceNameDTO) list_sumId.get(i)).getSum();    isp.setSum(b);    float c = ((IdSumPriceNameDTO) list_sumId.get(i)).getGoodsPrice();    isp.setGoodsPrice(c);    isp.setAllPrices(c);    String d =((IdSumPriceNameDTO) list_sumId.get(i)).getGoodsName();    isp.setGoodsName(d);    //session中的shops也随之更新，引用copy    hs.put(a, isp);    //引用赋null    isp = null;   }   // jsp显示   sess.setAttribute("shop", getList(hs));}//转向buy.jspreturn mapping.findForward("b");}

}

UpdateAction：

public class UpdateAction extends Action {/** *//*** 修改商品信息*///优化后的getList方法public static List getList(HashMap hs) {return new ArrayList(hs.values());}

public ActionForward execute(ActionMapping mapping, ActionForm form,   HttpServletRequest request, HttpServletResponse response)   throws Exception {GoodsForm gs = (GoodsForm)form;int[] ids = gs.getId();int[] sums = gs.getSum();float[] goodsPrices = gs.getGoodsPrice();String[] goodsName = gs.getGoodsName();//从session获得hsHashMap hs = (HashMap)request.getSession().getAttribute("shops");//从session中获得allIdSumList容器List idSum_list = (List)request.getSession().getAttribute("allIdSumList");//清空上次idSum_list容器中更新后的记录if(idSum_list!=null){   idSum_list.clear();}for(int i = 0;i<ids.length;i++){   //循环将 ids[i]和idSumPriceNameDTO put到hs容器中   IdSumPriceNameDTO idSumPriceNameDTO = new IdSumPriceNameDTO();   idSumPriceNameDTO.setId(ids[i]);   idSumPriceNameDTO.setGoodsName(goodsName[i]);   idSumPriceNameDTO.setGoodsPrice(goodsPrices[i]);   idSumPriceNameDTO.setSum(sums[i]);   idSumPriceNameDTO.setAllPrices(goodsPrices[i]);   // session中的"shops"也随之更新，引用copy   hs.put(ids[i], idSumPriceNameDTO);   //每次循环后将idSumPriceNameDTO 的引用设null   idSumPriceNameDTO = null;

   //idSum_list   IdSumPriceNameDTO idSumDTO = new IdSumPriceNameDTO(ids[i],sums[i],goodsPrices[i],goodsName[i]);   if(idSum_list == null){    idSum_list = new ArrayList();   }   // session中的"allIdSumList"也随之更新，引用copy   idSum_list.add(idSumDTO);}request.getSession().setAttribute("shop", getList(hs));     // 将过到updateAction中的商品id数组放入session中对修改操作完成后用户继续点击操作时和ider数组记录比较     request.getSession().setAttribute("ider", ids);     // 设置一个标志位，标志是经过修改数量的操作     String flag = "update";     request.getSession().setAttribute("flags", flag);//转向buy.jspreturn mapping.findForward("b");}

}

DeleteAction：

public class DeleteAction extends Action {

//优化后的getList方法public static List getList(HashMap hs) {return new ArrayList(hs.values());}

public ActionForward execute(ActionMapping mapping, ActionForm form,   HttpServletRequest request, HttpServletResponse response)   throws Exception {

Integer id = Integer.parseInt(request.getParameter("id"));

// 将ids_go中点击Id的历史记录中与页面传来的id比较，将相同的元素全delete掉List list_check = (List) request.getSession().getAttribute("ids_go");int size = list_check.size();int h = 0;for (int i = 0; i < size; i++) {   int j = (Integer)list_check.get(h);   if (j == id) {    //session中的"ids_go"也随之更新，引用copy    list_check.remove(h);   }else{    h++;   }}   // remove容器allIdSumList中和id相等的整个元素，保持delete后继续购物操作的正确性List list = (List) request.getSession().getAttribute("allIdSumList");for (int i = 0; i < list.size(); i++) {   int j = ((IdSumPriceNameDTO) list.get(i)).getId();   if (j == id) {   //session中的"allIdSumList"也随之更新，引用copy    list.remove(i);   }}// 从session中取出购物的hashmap容器HashMap hashmap = (HashMap) request.getSession().getAttribute("shops");//session中的shops也随之更新，引用copyhashmap.remove(id);//jsp显示request.getSession().setAttribute("shop", getList(hashmap));//执行了delete操作后，将updateAction中的标记flag设置为null//delete后，将修改信息的标记去除，还原为无修改操作状态String flag = null;request.getSession().setAttribute("flags", flag);//转向buy.jspreturn mapping.findForward("b");}

}

IdSumPriceNameDTO ：(JavaBean)

public class IdSumPriceNameDTO {

private int id;

private int sum = 1;

private float goodsPrice;private float allPrices;private String goodsName;

public IdSumPriceNameDTO() {super();}//id,sum,goodsPrice,goodsNamepublic IdSumPriceNameDTO(int id, int sum, float goodsPrice, String goodsName) {super();this.id = id;this.sum = sum;this.goodsPrice = goodsPrice;this.goodsName = goodsName;}

public String getGoodsName() {return goodsName;}

public void setGoodsName(String goodsName) {this.goodsName = goodsName;}

public float getAllPrices() {return allPrices;}//注意javabean中set 只有一个参数，定义多个时到jsp页面会出现无法找到getProperty异常public void setAllPrices(float goodsPrice) {this.allPrices = (float)(this.sum * goodsPrice);}

public float getGoodsPrice() {return goodsPrice;}

public void setGoodsPrice(float goodsPrice) {this.goodsPrice = goodsPrice;}

public int getId() {return id;}

public void setId(int id) {this.id = id;}

public int getSum() {return sum;}

public void setSum(int sum) {this.sum = sum;}

}

index.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib uri="WEB-INF/struts-bean.tld" prefix="bean"%><%@ taglib uri="WEB-INF/struts-html.tld" prefix="html"%><%@ taglib uri="WEB-INF/struts-logic.tld" prefix="logic"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html:html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title></title></head><body bgcolor="#CCCCCC"><table width="315" border="1"><tr>     <td colspan="2"><img src="1140438022_min.jpg" width="160" height="120"></td>     <td colspan="2"><img src="1140437663_min.jpg" width="160" height="120"></td>     <td colspan="2"><img src="1140438022_min.jpg" width="160" height="120"></td></tr><logic:iterate id="list" name="lister">    <tr>      <td><bean:write name="list" property="id" /></td>      <td width="85"><html:link page="/list.do" paramId="id" paramName="list" paramProperty="id" >在线订购</html:link></td>    </tr></logic:iterate></table>

</body></html:html>

buy.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@ taglib uri="WEB-INF/struts-bean.tld" prefix="bean"%><%@ taglib uri="WEB-INF/struts-html.tld" prefix="html"%><%@ taglib uri="WEB-INF/struts-logic.tld" prefix="logic"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html:html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title></title></head><body bgcolor="#CCCCCC"><html:form action="/update"><html:submit value="update" /><table width="302" height="55" border="1"><tr>     <td width="59">DELETE</td><td width="68">NAME</td><td width="77">PRICE</td><td width="77">NUM</td><td width="77">ALLPRICE</td></tr><logic:iterate id="sh" name="shop"><tr>    <html:hidden name="sh" property="id" />    <html:hidden name="sh" property="goodsPrice" />    <html:hidden name="sh" property="goodsName" />    <td><html:link page="/delete.do" paramId="id" paramName="sh" paramProperty="id" >delete</html:link></td>    <td><bean:write name="sh" property="goodsName" /></td>    <td><bean:write name="sh" property="goodsPrice" /></td>    <td><html:text name="sh" property="sum" /></td>    <td><bean:write name="sh" property="allPrices" /></td></tr>   </logic:iterate></table></html:form><html:link page="/shop.do">去收银台</html:link><html:link page="/index.do">继续购物</html:link>

</body></html:html>