商城页面的增删改查

manage-----index.jsp

        <em>商品管理</em>
                        </a>
                        <dl class="layui-nav-child">
                            <dd><a href="${pageContext.request.contextPath }/ListProductServlet">商品列表</a></dd>
                            

创建ListProductServlet类：直接调用查询所有商品的方法。

public class ListProductServlet extends HttpServlet {

private ProductService productService=new ProductService();
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取所有商品
        List<Product> list=productService.getProduct();
        //将商品放到request域中
        request.setAttribute("ProductList",list);
        //请求转发
        request.getRequestDispatcher("/manage/product/list.jsp").forward(request, response);
        
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

manage---product----list.jsp:展示商品：

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<link rel="stylesheet" href="${pageContext.request.contextPath }/manage/assets/css/layui.css">
<link rel="stylesheet" href="${pageContext.request.contextPath }/manage/assets/css/view.css" />
    <c:forEach items="${ProductList }" var="pro" varStatus="vs">
                                    <tr>
                                    <td>${vs.count }</td><!-- ${vs.index }从1开始 -->
                                    <td><img alt="" src="${pro.pimage }"></td>
                                    <td>${pro.pname }</td>
                                    <td>${pro.market_price }</td>
                                    <td>${pro.is_hot==1?"是":"否" }</td>
                                    <td>
                                        <div class="layui-btn-group">
                                            <div class="oper">
                                                <button type="button"
                                                    class="layui-btn layui-btn-blue layui-btn-sm" onClick="editProduct()">
                                                    <i class="layui-icon">&#xe642;</i> 编辑
                                                </button>
                                            </div>
                                            <div class="del">
                                                <button type="button"
                                                    class="layui-btn-danger layui-btn layui-btn-red layui-btn-sm">
                                                    <i class="layui-icon">&#xe640;</i>删除
                                                </button>
                                            </div>
                                        </div>
                                    </td>

                                </tr>
                            </c:forEach>
    <script type="text/javascript">
        function addProduct(){
            location.href="${pageContext.request.contextPath }/ProductAddUIServlet";
        }
        function editProduct(){
            location.href="edit.jsp";
        }
    </script>

当一点击新增按钮，跳转到ProductAddUIServlet类，创建ProductAddUIServlet类，只需要查询数据，直接写导层。

先封装实体类:

package com.oracle.domain;

public class Category {
private String cid;
private String cname;
public String getCid() {
    return cid;
}
public void setCid(String cid) {
    this.cid = cid;
}
public String getCname() {
    return cname;
}
public void setCname(String cname) {
    this.cname = cname;
}
@Override
public String toString() {
    return "Category [cid=" + cid + ", cname=" + cname + "]";
}

}

package com.oracle.dao;

import java.sql.SQLException;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.oracle.domain.Category;
import com.oracle.domain.Product;
import com.oracle.tools.MyDBUtils;

public class CategoryDao {
//查询所有分类
    public List<Category> getCategory() throws SQLException{
        QueryRunner qr=new QueryRunner(MyDBUtils.getDataSource());
        String sql="select * from category";
        List<Category> list=qr.query(sql,new BeanListHandler<Category>(Category.class));
        return list;
    }
}

service层：

package com.oracle.service;

import java.sql.SQLException;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.oracle.dao.CategoryDao;
import com.oracle.domain.Category;
import com.oracle.tools.MyDBUtils;

public class CategoryService {
private CategoryDao categoryDao=new CategoryDao();
//查询所有分类
public List<Category> getCategory() {
    List<Category> list=null;
    try {
        list=categoryDao.getCategory();
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return list;
}
}

ProductAddUIServlet类：

package com.oracle.web.product;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oracle.domain.Category;
import com.oracle.service.CategoryService;

public class ProductAddUIServlet extends HttpServlet {
    private CategoryService categoryService=new CategoryService();
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    List<Category> list=categoryService.getCategory();
    request.setAttribute("CategoryList",list);
    //请求转发
    request.getRequestDispatcher("/manage/product/add.jsp").forward(request, response);
    
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

product下的add.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="${pageContext.request.contextPath }/manage/assets/css/layui.css">
<link rel="stylesheet" href="${pageContext.request.contextPath }/manage/assets/css/view.css" />
<title></title>

                <div class="layui-form-item">
                        <label class="layui-form-label">所属分类</label>
                        <div class="layui-input-inline">
                            <select name="cid" lay-verify="required">
                                <option value="">请选择</option>
                                <c:forEach items="${CategoryList }" var="c">
                                <option value="${c.cid }">${c.cname }</option>
                                </c:forEach>
                                
                                
                            </select>
                        </div>

修改返回按钮返回上一级：

    <script src="${pageContext.request.contextPath }/manage/assets/layui.all.js"></script>
    <script>
        var form = layui.form, layer = layui.layer;
        function go(){
            location.href="${pageContext.request.contextPath }/ListProductServlet";
        }
    </script>