基于J2EE的B2C电子商务系统开发与程序实现

package eshop; import java.util.*; import java.sql.*; import eshop.Product; import eshop.tag; public class ProductListBean { private Vector items=new Vector(); private int pageSize; //一页显示的记录数 private int rowCount; //ResultSet的记录总数 private int pageCount; //ResultSet分页后的总页数 private int showPage; //待显示页码，即当前页码数 private String pageIndex; private int pageNumber; private int productID; private Connection conn; private int tag; public ProductListBean() { } /*从商品列表中得到一种商品的纪录*/ public Product getItem(int index){ return (Product)items.elementAt(index); } /*得到总页数*/ public tag settag(int tag1) { tag tag = new tag(); tag.set(tag1); return null; } public int gettag(){ tag tag = new tag (); return tag.get(); } public int getPageCount(){ return pageCount; } /*得到当前页码数*/ public int getShowPage(){ return showPage; } /*得到本页商品个数*/ public int getPageNumber(){ return pageNumber; } public String getPageIndex(){ return pageIndex; } /*设置数据库连接*/ public void setConn(Connection conn){ this.conn=conn; } /*初始化,即重置变量,清空商品列表中的所有商品*/ public void reset(){ pageSize=5; pageCount=0; showPage=1; items.removeAllElements(); } /*设置当前页码数*/ public void setPageIndex(String pageIndex){ this.pageIndex=pageIndex; } /*设置商品号*/ public void setProductID(int productID){ this.productID=productID; } /*得到商品号*/ public int getProductID(){ return productID; } /*得到当前要显示的商品*/ public Product getProduct(){ try{ Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); String sql = "SELECT * FROM PRODUCTS WHERE ProductID=" + productID; ResultSet rsProducts = stmt.executeQuery(sql); if (rsProducts.next()) { Product prod = new Product(); prod.setProduct(rsProducts.getInt("ProductID"), rsProducts.getString("ProductName"), rsProducts.getString("Coding"), rsProducts.getInt("SupplierID"), rsProducts.getString("CategoryID"), rsProducts.getDouble("SupplierPrice"), rsProducts.getDouble("MarketPrice"), rsProducts.getDouble("Price"), rsProducts.getString("Picture"), rsProducts.getInt("StockNumber"), rsProducts.getInt("SaleNumber"), rsProducts.getString("ModifyMan"), rsProducts.getString("ModifyDate"), rsProducts.getString("Description") ); return prod; } } catch(SQLException e){ e.printStackTrace(); } return null; } public Product getProduct1(String productname){ try{ Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); String sql = "SELECT * FROM PRODUCTS WHERE productName='"+productname.trim()+"'"; ResultSet rsProducts = stmt.executeQuery(sql); if (rsProducts.next()) { Product prod = new Product(); prod.setProduct(rsProducts.getInt("ProductID"), rsProducts.getString("ProductName"), rsProducts.getString("Coding"), rsProducts.getInt("SupplierID"), rsProducts.getString("CategoryID"), rsProducts.getDouble("SupplierPrice"), rsProducts.getDouble("MarketPrice"), rsProducts.getDouble("Price"), rsProducts.getString("Picture"), rsProducts.getInt("StockNumber"), rsProducts.getInt("SaleNumber"), rsProducts.getString("ModifyMan"), rsProducts.getString("ModifyDate"), rsProducts.getString("Description") ); return prod; } } catch(SQLException e){ e.printStackTrace(); } return null; } /*根据页码号从数据库中得到相应的商品信息，并将其存储到商品列表items中*/ public void storeItem(){ try{ Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); String sql="SELECT * FROM Products"; ResultSet rsProducts=stmt.executeQuery(sql); rsProducts.last(); //将指针移动到最后一条记录 rowCount=rsProducts.getRow(); //取得ResultSet中记录的总条数 pageCount=((rowCount%pageSize)==0)?(rowCount/pageSize):(rowCount/pageSize+1); //计算总页数 if(pageIndex==null||pageIndex.equals("")){ showPage=1; //URL中不带参数的情况 }else{ //try{ showPage=Integer.parseInt(pageIndex); //URL中带参数的情况 //} //catch(NumberFormatException e){ // showPage=1; //} if(showPage<1) { showPage=1; //URL中应显示的页面小于1的处理 }else if(showPage>pageCount){ showPage=pageCount; //URL中应显示的页面大于页面总数的处理 } } if(showPage*pageSize>=rowCount){ pageNumber=rowCount-(showPage-1)*pageSize; }else{ pageNumber=pageSize; } if(pageCount>0){ rsProducts.absolute((showPage-1)*pageSize+1); } for(int i=0;i<pageNumber;i++){ Product prod=new Product(); prod.setProduct(rsProducts.getInt("ProductID"), rsProducts.getString("ProductName"), rsProducts.getString("Coding"), rsProducts.getInt("SupplierID"), rsProducts.getString("CategoryID"), rsProducts.getDouble("SupplierPrice"), rsProducts.getDouble("MarketPrice"), rsProducts.getDouble("Price"), rsProducts.getString("Picture"), rsProducts.getInt("StockNumber"), rsProducts.getInt("SaleNumber"), rsProducts.getString("ModifyMan"), rsProducts.getString("ModifyDate"), rsProducts.getString("Description") ); items.addElement(prod); rsProducts.next(); } rsProducts.close(); stmt.close(); } catch(SQLException e){ e.printStackTrace(); } } }