day06.txt

网络购物系统开发详细步骤

 *** 为产品管理添加修改，删除和按照类别查询的功能 ***

1，为ProductMgmSessionFacadeEJB 添加4个方法：

   a) method name     : getProductByCategory
      return type     : java.util.Collection
      input parameter : String categoryId
      interface       : Local 

   b) method name     : deleteProduct
      return type     : void
      input parameter : String productId
      interface       : Local

   c) method name     : updateProduct
      return type     : void
      input parameter : dto.ProductDTO product
      interface       : Local

   d) method name     : getProductById
      return type     : dto.ProductDTO
      input parameter : String productId
      interface       : Local

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

2, 为上述方法添加函数体

   右键点击ProductMgmSessionFacadeEJB ---> view bean source

   public Collection getProductByCategory(String id) 
		throws FinderException {
    CategoryLocal cLocal = 
          categoryHome.findByPrimaryKey(new Integer(id));
    Collection col = cLocal.getProducts();
    HashSet set = new HashSet();
    Iterator i = col.iterator();

    CategoryDTO category = new CategoryDTO(
          (Integer)cLocal.getPrimaryKey(),
          cLocal.getName(),
          cLocal.getDescription());

    while( i.hasNext() ){
      ProductLocal pLocal = (ProductLocal)i.next();

      set.add( new ProductDTO( 
            (String)pLocal.getPrimaryKey(),
             pLocal.getName(),
             pLocal.getBaseprice(),
             pLocal.getDescription(),
            category));
    }
    return set;
  }

==========================================================
   
  public void deleteProduct(String id) 
         throws FinderException, RemoveException {

    ProductLocal pLocal = 
        productHome.findByPrimaryKey( id );
    pLocal.remove();
  }

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

  public void updateProduct(dto.ProductDTO product) 
                   throws FinderException {
    CategoryLocal cLocal =               categoryHome.findByPrimaryKey(
                        product.getCategory().getId());
    ProductLocal pLocal = 
              productHome.findByPrimaryKey( 
                        product.getProductId());
    pLocal.setName( product.getName());
    pLocal.setBaseprice( product.getBasePrice() );
    pLocal.setDescription( product.getDesc() );
    pLocal.setCategory(cLocal);
  }

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

  public dto.ProductDTO getProductById(String id)
                            throws FinderException{
    
    ProductLocal pLocal = 
            productHome.findByPrimaryKey( id );
    CategoryLocal cLocal = pLocal.getCategory();
    CategoryDTO category = new CategoryDTO(
                           cLocal.getCategoryid(),
                           cLocal.getName(),
                           cLocal.getDescription());
    ProductDTO product = new ProductDTO(
               pLocal.getProductid(),
               pLocal.getName(),
               pLocal.getBaseprice(),
               pLocal.getDescription(),
               category);
    return product;
  }

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

3,修改ProductMgmSessionFacadeLocal 中相应的4个函数声明, 使之与ProductMgmSessionFacadeBean
  中的声明一致：

package ejbs;

import javax.ejb.*;
import java.util.*;
import dto.*;

public interface ProductMgmSessionFacadeLocal extends javax.ejb.EJBLocalObject {

  ...............

  public Collection getProductByCategory(String id) 
               throws FinderException;
  public void deleteProduct(String id) 
               throws FinderException, RemoveException;
  public void updateProduct(ProductDTO product) 
               throws FinderException;
  public dto.ProductDTO getProductById(String id) 
               throws FinderException;

  ..............
} 

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

4, 编译ejb-module

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

5, 为ProductMgmDelegate 添加四个相应的方法：

  public Collection getProductsByCategory( String id )
                               throws FinderException{

    return sessionLocal.getProductByCategory( id );
  }

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

  public void deleteProduct( String id )
         throws FinderException,RemoveException {
       sessionLocal.deleteProduct( id );
  }

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

  public void updateProduct( ProductDTO product )
                        throws FinderException{
     sessionLocal.updateProduct( product );
  }

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

  public ProductDTO getProductById( String id ) 
            throws  FinderException {
    return sessionLocal.getProductById( id );
  }

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


7 ，为searchProduct.do创建ActionForm

    file --> new --> web --> Action From
   
    package    : ec_port_web
    ActionForm : SearchProductForm
    ---> next --> add

    name: category
    type: java.lang.String

    ---> finish

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

package ec_port_web;

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

public class SearchProductForm 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) {
  }
}   

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

8,为searchProduct.do 创建Action

  package   : ec_port_web
  Action    : SearchProductAction
  
  ---> next

  aciton path  : searchProduct.do
  formBean name: SearchProductAction
  validate     : false
  scope        : session
  input jsp    : productMgm.jsp

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

9, 修改perform() 方法 ( 如下所示 )

package ec_port_web;

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

public class SearchProductAction extends Action {
  public ActionForward perform(
        ActionMapping actionMapping, 
        ActionForm actionForm, 
        HttpServletRequest request, 
        HttpServletResponse httpServletResponse) {
 
    SearchProductForm form = 
             (SearchProductForm) actionForm;

    try{
      ProductMgmDelegate pd = new ProductMgmDelegate();

      Collection categoryCol = pd.getAllCategory();
      request.getSession().
             setAttribute( "ALL_CATEGORY" ,categoryCol);

      String categoryId = form.getCategory() ;
      Collection products = null;

      if( categoryId.equals( "all" ) ){
        products = pd.getAllProduct();
        request.getSession().
                setAttribute( "ALL_PRODUCT" , products );
        return actionMapping.findForward( "success" );
      }

       products = pd.getProductsByCategory( categoryId ) ;

      request.getSession().
              setAttribute( "ALL_PRODUCT" , products);
  
      return actionMapping.findForward( "success" );
    }catch( ServiceLocatorException se ){
      se.printStackTrace();
      return actionMapping.findForward( "systemError" );
    }
     catch( FinderException fe ){
      fe.printStackTrace();
      return actionMapping.findForward( "systemError" );
    }
     catch( CreateException ce ){
       ce.printStackTrace();
       return actionMapping.findForward( "systemError" );
    }
  }
}

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

10, 为SearchProductAction 配置forward

    a) when query success
       path : /productMgm.jsp
       name : success

    b) when some exceptions be caught
       path : /fail.jsp
       name : systemError

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

11, 为delModProduct.do 创建ActionForm

    file --> new --> web --> ActionForm

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

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

package ec_port_web;

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

public class DelModProductForm extends ActionForm {
  private String prductId;

  public String getPrductId() {
    return prductId;
  }

  public void setPrductId(String prductId) {
    this.prductId = prductId;
  }

  public ActionErrors validate(
        ActionMapping actionMapping, 
        HttpServletRequest httpServletRequest) {
    
    return null;
  }
  public void reset(
            ActionMapping actionMapping,             HttpServletRequest httpServletRequest) {
  }
}

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

12, 为delModProduct.do 创建Action

    file --> new --> web --> Action

    package    : ec_port_web
    Action     : DelModProductAction
    ---> next 

   action path   : /delModProduct