wangshanggouwu.txt

网上购物系统

/**         
          *       <p>Title:       购物车</p>         
          *       <p>Description:       实现对商城购物车的操作</p>         
          *       <p>Copyright:       Copyright       (c)       2004</p>         
          *       <p>Company:       公司</p>         
          *       @author       网络信息部       范庆丰         
          *       @version       1.0         
          */         
            
            
      package       cartbean;         
      import       java.util.*;         
      import       java.sql.*;         
      import       sqlbean.*;         
      public       class       CartBean       {         
              protected       Hashtable       itemHashtable       =       new       Hashtable();         
            
            
              public       CartBean()       {         
              }         
              public       void       setItemHashtable(Hashtable       ht)         
              {         
                      itemHashtable=ht;         
              }         
              public       Hashtable       getItemHashtable()         
              {         
                      return       itemHashtable;         
              }         
            
              /**         
                  *       增加上商品到购物车         
                  *       @param       id       int       商品ID         
                  *       @param       desc       String       商品ISBN编号         
                  *       @param       price       double       商品单价         
                  *       @param       qty       int       数量         
                  */         
              public       void       addItem(int       id,String           isbn,String       desc       ,double       price,int       qty)         
              {         
                      String[]       item={Integer.toString(id),isbn,desc,Double.toString(price),Integer.toString(qty)};         
                      if(itemHashtable.containsKey(Integer.toString(id)))         
                      {         
                              String[]       workItem=(String[])itemHashtable.get(Integer.toString(id));         
                              int       workQty=Integer.parseInt(workItem[4]);         
                              qty=qty+workQty;         
                              workItem[4]=Integer.toString(qty);         
                      }         
                      else         
                              itemHashtable.put(Integer.toString(id),item);         
            
              }         
            
              /**         
                  *       修改购物车某种商品的数量         
                  *       @param       id       int       商品ID         
                  *       @param       desc       String       商品ISBN编号         
                  *       @param       price       double       商品单价         
                  *       @param       qty       int       数量         
                  */         
              public       void       changeItem(int       id,int       qty)         
              {         
                      if(itemHashtable.containsKey(Integer.toString(id)))         
                      {         
                              String[]       workItem=(String[])itemHashtable.get(Integer.toString(id));         
                              workItem[4]=Integer.toString(qty);         
                      }         
              }         
            
              /**         
                  *       删除购物车中的某种商品         
                  *       @param       id       int         
                  */         
              public       void       removeItem(int       id)         
              {         
                      if(itemHashtable.containsKey(Integer.toString(id)))         
                      {         
                              itemHashtable.remove(Integer.toString(id));         
                      }         
              }         
              public       Enumeration       getEnumeration()         
              {         
                      return       itemHashtable.elements();         
              }         
            
              /**         
                  *       购物车商品总金额         
                  *       @return       double         
                  */         
              public       double       getCost()         
              {         
                      Enumeration       enum=itemHashtable.elements();         
                      String[]       workItem;         
                      double       totalCost=0.00;         
                      while(enum.hasMoreElements())         
                      {         
                              workItem=(String[])enum.nextElement();         
                              totalCost=totalCost+(Integer.parseInt(workItem[4])*Double.parseDouble(workItem[3]));         
                      }         
                      return       totalCost;         
              }         
            
              /**         
                  *       购物车商品类数         
                  *       @return       int         
                  */         
              public       int       getNumofItem()         
              {         
                      Enumeration       enum=itemHashtable.elements();         
                      String[]       workItem;         
                      int       num=0;         
                      while(enum.hasMoreElements())         
                      {         
                              workItem=(String[])enum.nextElement();         
                              num=num+Integer.parseInt(workItem[4]);         
                      }         
                      return       num;         
              }         
            
              /**         
                  *       清空购物车记录         
                  */         
              public       void       ClearItem()         
              {         
                      itemHashtable.clear();         
              }         
            
              public       void       InsertCart(CartBean       a,int       PPUserID)         
                      {       Connection       con;         
                              try         
                                      {         
                                                      Conn       conn=new       Conn();         
                                                      con=conn.getConn();         
                                                      Statement       statement=con.createStatement();         
                                                      Enumeration       b=a.getEnumeration();         
                                                      String       c[];         
                                                      while(b.hasMoreElements())         
                                                      {         
                                                              c=(String[])b.nextElement();         
                                                              String       values;         
                                                              values=PPUserID+","+c[0]+","+c[3]+","+c[4];         
                                                              statement.executeUpdate("insert       into       Cart(UserID,ProductID,Price,Num)       values("+values+")");         
                                                      }         
                                                      conn.FreeConn();         
                                      }//try         
                                      catch(Exception       e)         
                                                      {         
                                                                      System.out.println(e.getMessage());         
                                                      }   //catch         
                      }         
            
            
            
      }