案例3-删除商品
1 给删除按钮添加一个点击事件
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <HTML> <HEAD> <meta http-equiv="Content-Language" content="zh-cn"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link href="${pageContext.request.contextPath}/css/Style1.css" rel="stylesheet" type="text/css" /> <script language="javascript" src="${pageContext.request.contextPath}/js/public.js"></script> <script type="text/javascript"> function addProduct(){ window.location.href = "${pageContext.request.contextPath}/adminAddProductUI"; } function delProduct(pid){ var flag = confirm("你确认要删除吗？"); /* alert(pid); */ /* alert(flag); */ if(flag){ location.href="${pageContext.request.contextPath}/delProduct?pid="+pid; } } </script> </HEAD> <body> <br> <form id="Form1" name="Form1" action="${pageContext.request.contextPath}/user/list.jsp" method="post"> <table cellSpacing="1" cellPadding="0" width="100%" align="center" bgColor="#f5fafe" border="0"> <TBODY> <tr> <td class="ta_01" align="center" bgColor="#afd1f3"><strong>商品列表${isSuccess==true?"删除成功":"删除失败"}</strong> </TD> </tr> <tr> <td class="ta_01" align="right"> <button type="button" id="add" name="add" value="添加" class="button_add" onclick="addProduct()"> 添加</button> </td> </tr> <tr> <td class="ta_01" align="center" bgColor="#f5fafe"> <table cellspacing="0" cellpadding="1" rules="all" bordercolor="gray" border="1" id="DataGrid1" style="BORDER-RIGHT: gray 1px solid; BORDER-TOP: gray 1px solid; BORDER-LEFT: gray 1px solid; WIDTH: 100%; WORD-BREAK: break-all; BORDER-BOTTOM: gray 1px solid; BORDER-COLLAPSE: collapse; BACKGROUND-COLOR: #f5fafe; WORD-WRAP: break-word"> <tr style="FONT-WEIGHT: bold; FONT-SIZE: 12pt; HEIGHT: 25px; BACKGROUND-COLOR: #afd1f3"> <td align="center" width="18%">序号</td> <td align="center" width="17%">商品图片</td> <td align="center" width="17%">商品名称</td> <td align="center" width="17%">商品价格</td> <td align="center" width="17%">是否热门</td> <td width="7%" align="center">编辑</td> <td width="7%" align="center">删除</td> </tr> <!-- varStatus 记录第几次遍历 --> <c:forEach items="${productList }" var="product" varStatus="vs"> <tr onmouseover="this.style.backgroundColor = 'white'" onmouseout="this.style.backgroundColor = '#F5FAFE';"> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="18%">${vs.count }</td> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="17%"><img width="40" height="45" src="${pageContext.request.contextPath }/${product.pimage }"></td> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="17%">${product.pname }</td> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="17%">${product.shop_price }</td> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="17%"> ${product.is_hot==1?"是":"否" }</td> <td align="center" style="HEIGHT: 22px"><a href="${ pageContext.request.contextPath }/admin/product/edit.jsp"> <img src="${pageContext.request.contextPath}/images/i_edit.gif" border="0" style="CURSOR: hand"> </a></td> <!-- href="javascript:void(0)"让它不跳转 --> <td align="center" style="HEIGHT: 22px"><a href="javascript:void(0)" onclick="delProduct(${product.pid})"> <img src="${pageContext.request.contextPath}/images/i_del.gif" width="16" height="16" border="0" style="CURSOR: hand"> </a></td> </tr> </c:forEach> </table> </td> </tr> </TBODY> </table> </form> </body> </HTML>
2 web的DelProductServlet
package www.test.web; import java.io.IOException; import java.sql.SQLException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import www.test.service.AdminProductService; public class DelProductServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取数据 String pid = request.getParameter("pid"); // System.out.println(pid); AdminProductService service = new AdminProductService(); boolean isSuccess = true; try { isSuccess = service.delProduct(pid); } catch (SQLException e) { e.printStackTrace(); } // 将数据存储到request域 request.setAttribute("isSuccess", isSuccess); request.getRequestDispatcher("/adminProductList").forward(request, response); //request.getRequestDispatcher("/admin/product/list.jsp").forward(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
3service层AdminProductService
package www.test.service; import java.sql.SQLException; import java.util.List; import www.test.dao.AdminProductDao; import www.test.domain.Category; import www.test.domain.Product; public class AdminProductService { public List<Product> findAllProduct() throws SQLException { //因为没有复杂业务 直接传递请求到dao层 AdminProductDao dao = new AdminProductDao(); return dao.findAllProduct(); } public List<Category> findAllCategory() throws SQLException { AdminProductDao dao = new AdminProductDao(); return dao.finAllCategory(); } // 添加商品 public boolean addProduct(Product product) throws SQLException { AdminProductDao dao = new AdminProductDao(); return dao.addProduct(product); } //删除数据 public boolean delProduct(String pid) throws SQLException { AdminProductDao dao = new AdminProductDao(); return dao.delProduct(pid); } }
4dao层AdminProductDao
package www.test.dao; import java.sql.SQLException; import java.util.List; import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.handlers.BeanListHandler; import www.test.domain.Category; import www.test.domain.Product; import www.test.utils.C3P0Utils; public class AdminProductDao { public List<Product> findAllProduct() throws SQLException { QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource()); String sql = "select * from product"; List<Product> productList = qr.query(sql, new BeanListHandler<Product>(Product.class)); return productList; } public List<Category> finAllCategory() throws SQLException { QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource()); String sql = "select * from category"; List<Category> categoryList = qr.query(sql, new BeanListHandler<Category>(Category.class)); return categoryList; } //添加数据 public boolean addProduct(Product product) throws SQLException { QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource()); String sql = "insert into product values(?,?,?,?,?,?,?,?,?,?)"; Object[] params = {product.getPid(),product.getPname(),product.getMarket_price(),product.getShop_price(),product.getPimage(),product.getPdate(),product.getIs_hot(),product.getPdesc(),product.getPflag(),product.getCid()}; int num = qr.update(sql, params); if(num>0){ return true; }else{ return false; } } // 删除数据 public boolean delProduct(String pid) throws SQLException { QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource()); String sql = "delete from product where pid=?"; int num = qr.update(sql, pid); if(num>0){ return true; }else{ return false; } } }
5 显示执行结果
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <HTML> <HEAD> <meta http-equiv="Content-Language" content="zh-cn"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link href="${pageContext.request.contextPath}/css/Style1.css" rel="stylesheet" type="text/css" /> <script language="javascript" src="${pageContext.request.contextPath}/js/public.js"></script> <script type="text/javascript"> function addProduct(){ window.location.href = "${pageContext.request.contextPath}/adminAddProductUI"; } function delProduct(pid){ var flag = confirm("你确认要删除吗？"); /* alert(pid); */ /* alert(flag); */ if(flag){ location.href="${pageContext.request.contextPath}/delProduct?pid="+pid; } } </script> </HEAD> <body> <br> <form id="Form1" name="Form1" action="${pageContext.request.contextPath}/user/list.jsp" method="post"> <table cellSpacing="1" cellPadding="0" width="100%" align="center" bgColor="#f5fafe" border="0"> <TBODY> <tr> <td class="ta_01" align="center" bgColor="#afd1f3"><strong>商品列表 <font color="red">${isSuccess==true?"删除成功":"删除失败"}</font></strong> </TD> </tr> <tr> <td class="ta_01" align="right"> <button type="button" id="add" name="add" value="添加" class="button_add" onclick="addProduct()"> 添加</button> </td> </tr> <tr> <td class="ta_01" align="center" bgColor="#f5fafe"> <table cellspacing="0" cellpadding="1" rules="all" bordercolor="gray" border="1" id="DataGrid1" style="BORDER-RIGHT: gray 1px solid; BORDER-TOP: gray 1px solid; BORDER-LEFT: gray 1px solid; WIDTH: 100%; WORD-BREAK: break-all; BORDER-BOTTOM: gray 1px solid; BORDER-COLLAPSE: collapse; BACKGROUND-COLOR: #f5fafe; WORD-WRAP: break-word"> <tr style="FONT-WEIGHT: bold; FONT-SIZE: 12pt; HEIGHT: 25px; BACKGROUND-COLOR: #afd1f3"> <td align="center" width="18%">序号</td> <td align="center" width="17%">商品图片</td> <td align="center" width="17%">商品名称</td> <td align="center" width="17%">商品价格</td> <td align="center" width="17%">是否热门</td> <td width="7%" align="center">编辑</td> <td width="7%" align="center">删除</td> </tr> <!-- varStatus 记录第几次遍历 --> <c:forEach items="${productList }" var="product" varStatus="vs"> <tr onmouseover="this.style.backgroundColor = 'white'" onmouseout="this.style.backgroundColor = '#F5FAFE';"> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="18%">${vs.count }</td> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="17%"><img width="40" height="45" src="${pageContext.request.contextPath }/${product.pimage }"></td> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="17%">${product.pname }</td> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="17%">${product.shop_price }</td> <td style="CURSOR: hand; HEIGHT: 22px" align="center" width="17%"> ${product.is_hot==1?"是":"否" }</td> <td align="center" style="HEIGHT: 22px"><a href="${ pageContext.request.contextPath }/admin/product/edit.jsp"> <img src="${pageContext.request.contextPath}/images/i_edit.gif" border="0" style="CURSOR: hand"> </a></td> <!-- href="javascript:void(0)"让它不跳转 --> <td align="center" style="HEIGHT: 22px"><a href="javascript:void(0)" onclick="delProduct(${product.pid})"> <img src="${pageContext.request.contextPath}/images/i_del.gif" width="16" height="16" border="0" style="CURSOR: hand"> </a></td> </tr> </c:forEach> </table> </td> </tr> </TBODY> </table> </form> </body> </HTML>
6 总结
1 取消超链接点击效果 <a href="javascript:void(0)" onclick="delProduct(${product.pid})">
