day07.txt

网络购物系统开发详细步骤

 ====== 为主页添加浏览，按照类别查询,购买的功能 =====

1，修改index.html


<%

  Collection categoryCol = 
    (Collection)session.getAttribute( "ALL_CATEGORY" );
  Collection productCol = 
    (Collection)session.getAttribute( "CURRENT_PRODUCT" );
  String currCategory = 
       (String)session.getAttribute( "CURRENT_CATEGORY" );
  if( categoryCol == null || productCol == null ){
	ProductMgmDelegate pd = new ProductMgmDelegate();
	categoryCol = pd.getAllCategory();
	productCol = pd.getAllProduct();
  }
  if( currCategory==null ){
	currCategory = "all";
  }

%>



      <form action="selectCategory.do" method="post">
        <table width="90%" border="0" cellspacing="1" 
              cellpadding="0" height="32" align="center"               bgcolor="#D4D4D4">
          <tr>
            <td height="16" width="66">商品搜索：</td>
            <td height="16" width="96">
            <select name="category">
<%
	    if( currCategory.equals( "all" ) ){
%>
		<option value="all" selected>ALL</option>
<%
	    }else{
%>
		<option value="all" select>ALL</option>
<%
	    }
%>
<%
            Iterator i = categoryCol.iterator();
	    while( i.hasNext() ){
		CategoryDTO category =                       (CategoryDTO)i.next();
		if( currCategory.equals(                     category.getId().intValue()+"" ) ){
%>
		    <option value='<%=category.
                             getId().intValue() + ""%>'
                    selected>
			<%=category.getName()%>
                    </option>
<%
		 }
                 else{
%>
		     <option value=
                       '<%=category.getId().
                             intValue() + ""%>'>
		         <%=category.getName()%>
                     </option>
<%
                }
	}
%>
		</select>

 </td>
            <td height="16" width="55">
		<input type="submit" name="search" value="搜索">
            </td>
          </tr>
        </table>
      </form>
      <table width="90%" border="0" cellspacing="0"            cellpadding="0">
        <tr>
          <td width="35%"> 
             <hr noshade size="1" color="#ff9900"> </td>
          <td bgcolor="#FF9900" align="center" 
               width="34%"><b>
            <font color="#FFFFFF">
               本店推荐
            </font></b></td>
          <td width="31%"> 
            <hr noshade size="1" color="#ff9900"> </td>
        </tr>
      </table>

     <table bordercolor=#FFFFFF height=362 cellspacing=3
                  cellpadding=3 border=0>
        <tr bordercolor=#cccccc>
          <td height="529" align="center">

<%
    Iterator iter = productCol.iterator();
    while( iter.hasNext() ){
	ProductDTO product = (ProductDTO)iter.next();
%>
      <form action="buyProduct.do" method="post">
       <input type="hidden" name="productId"
              value='<%=product.getProductId()%>'>
       <table width="400" border="0" cellspacing="1"
              cellpadding="4" bgcolor="3399ff">
          <tr>
            <td bgcolor="#ececec" width="22%"                              align="center" height="11">产品类别</td>
            <td bgcolor="#FFFFFF" height="11">
                <%=product.getCategory().getName()%>
            </td>
          </tr>
          <tr>
            <td bgcolor="#ececec" width="22%" 
                align="center" height="11">产品名称
          </td>
          <td bgcolor="#FFFFFF" height="11">
              <%=product.getName()%>
          </td>
          </tr>
          <tr>
          <td bgcolor="#ececec" width="22%"
              align="center" height="11">产品价格</td>
          <td bgcolor="#FFFFFF" height="11">
              <%=product.getBasePrice()%>
          </td>
          </tr>
          <tr>
          <td bgcolor="#ececec" width="22%" 
              align="center" height="11">购买数量</td>
           <td bgcolor="#FFFFFF" height="11">           
               <input type="text" name="amount">
            </td>
          </tr>
	 <tr><td colspan="2">
	   <p align="right">&nbsp;&nbsp;
           <input type="image" src="images/che1.gif" ></p>
         </td></tr>

      </tr>
   </table>
   </form>
<%
}
%>
<td></tr></table>

==========================================================

2，为selectCategory.do 创建ActionForm

   package     : ec_port_web
   Action Form : SelectCategoryForm
   --> next ---> add
   name   : cateogory
   type   : java.lang.String
   ----> finish

=========================================================

package ec_port_web;

import org.apache.struts.action.*;
import javax.servlet.http.*;

public class SelectCategoryForm extends ActionForm {
  private String category;
  public String getCategory() {
    return category;
  }
  public void setCategory(String category) {
    this.category = category;
  }
  public ActionErrors validate(
             ActionMapping actionMapping, 
             HttpServletRequest httpServletRequest) {
    
    return null;
  }
  public void reset(ActionMapping actionMapping,                  HttpServletRequest httpServletRequest) {
  }
}

=========================================================

3,为selectCategory.do 创建Action

  package     : ec_port_web
  Action      : SelectCategoryAction

  ---> next
  action path     : /selectCategory
  formbean name   : selectCategoryForm
  scope           : session
  validate        : true
  input jsp       : index.jsp

=========================================================

4,修改Perform() 方法


package ec_port_web;

import org.apache.struts.action.*;
import javax.servlet.http.*;
import javax.ejb.CreateException;
import javax.ejb.FinderException;
import exceptions.ServiceLocatorException;
import delegates.ProductMgmDelegate;
import java.util.Collection;

public class SelectCategoryAction extends Action {
  public ActionForward perform(
           ActionMapping actionMapping, 
           ActionForm actionForm, 
           HttpServletRequest request,
           HttpServletResponse httpServletResponse) {
    
    SelectCategoryForm form =
            (SelectCategoryForm)actionForm;
    try{
      ProductMgmDelegate pd = new ProductMgmDelegate();
      Collection productCol = null;
      String currentCategory = null;

      if( form.getCategory().equals( "all" ) ){
        productCol = pd.getAllProduct();
        currentCategory = "all";
      }else{
        productCol = 
            pd.getProductsByCategory( form.getCategory());
        currentCategory = form.getCategory();
      }

      Collection categoryCol = pd.getAllCategory();

      request.getSession().
         setAttribute( "CURRENT_PRODUCT" , productCol );

      request.getSession().
         setAttribute( "ALL_CATEGORY" , categoryCol );
      request.getSession().setAttribute( 
                "CURRENT_CATEGORY" , urrentCategory );

      return actionMapping.findForward( "success" );

    }catch( FinderException fe ){
      fe.printStackTrace();
      return actionMapping.findForward( "systemError" );
    }catch( CreateException ce ){
      ce.printStackTrace();
      return actionMapping.findForward( "systemError" );
    }catch( ServiceLocatorException se ){
      se.printStackTrace();
      return actionMapping.findForward( "systemError" );
    }
  }
}

=========================================================
5, 为SelectCategoryAction配置 forward

   a) query success
      path : /index.jsp
      name : success

   b) when some exceptions be caught
      path : /systemerror.html
      name : success

=========================================================