本文共 3002 字，大约阅读时间需要 10 分钟。

Java Web 网络商城案例演示十（商品详情）

原理分析

步骤实现

1、准备工作 /jsp/index.jsp修改链接

   					
    
						
      												
     
							${
   p.pname }						
						
     
							¥${
   p.shop_price }						
					
    
				
   

public class ProductServlet extends BaseServlet {
   	// findProductByPid	public String findProductByPid(HttpServletRequest request, HttpServletResponse response) throws Exception {
   		String pid =  request.getParameter("pid");		System.out.println("pid="+pid);		ProductService productService = new ProductServiceImpl();		Product product = productService.findProductByPid(pid);				request.setAttribute("product", product);				return "/jsp/product_info.jsp";	}}

ProductService

public interface ProductService {
   		//查询最新商品	List
   
     findHots() throws Exception;	//查询最新最热商品	List
    
      findNews() throws Exception;	//查询详情	Product findProductByPid(String pid)throws Exception;}
    
   

ProductServiceImpl

public class ProductServiceImpl implements ProductService {
   	ProductDao productDao = new ProductDaoImpl();	@Override	public List
   
     findHots() throws Exception {
   		// TODO Auto-generated method stub		return productDao.findHots();	}	@Override	public List
    
      findNews() throws Exception {
   		// TODO Auto-generated method stub		return productDao.findNews();	}	@Override	public Product findProductByPid(String pid) throws Exception {
   		// TODO Auto-generated method stub		return productDao.findProductByPid(pid);	}}
    
   

ProductDao

public interface ProductDao {
   	List
   
     findHots() throws Exception;	List
    
      findNews() throws Exception;	Product findProductByPid(String pid)throws Exception;}
    
   

ProductDaoImpl

public class ProductDaoImpl implements ProductDao {
   	@Override	public List
   
     findHots() throws Exception {
   		// TODO Auto-generated method stub		String sql = "SELECT * FROM product WHERE pflag=0 AND is_hot=1 ORDER BY pdate DESC LIMIT 0,9;";		QueryRunner qr = new QueryRunner(JDBCUtils.getDataSource());		return qr.query(sql, new BeanListHandler
    
     (Product.class));	}	@Override	public List
     
       findNews() throws Exception {
   		// TODO Auto-generated method stub		String sql = "SELECT * FROM product WHERE pflag=0 ORDER BY pdate DESC LIMIT 0,9";		QueryRunner qr = new QueryRunner(JDBCUtils.getDataSource());		return qr.query(sql, new BeanListHandler
      
       (Product.class));	}	@Override	public Product findProductByPid(String pid) throws Exception {
   		// TODO Auto-generated method stub		String sql = "select * from product where pid=?";		QueryRunner qr = new QueryRunner(JDBCUtils.getDataSource());		return qr.query(sql, new BeanHandler
       
        (Product.class),pid);	}}
       
      
     
    
   

${product}:底层依次吊样个域对象上的*.getAttribute("keyName");					寻找搭配request可以获取到一个对象					$(product.pname);通过获取到的product对象去调用对象上getPname()方法的，返回值。

转载地址：https://code100.blog.csdn.net/article/details/104996603 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！