java web 网上商城，简单的后台管理商品

      package cn.zzk.servlet;

import java.io.File;

import java.io.IOException;

import java.util.Iterator;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileItemFactory;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import cn.zzk.dao.ProductDao;

import cn.zzk.po.Page;

import cn.zzk.po.Product;

 

/**

 * Servlet implementation class ProductServlet

 */

@WebServlet("/ProductServlet")

public class ProductServlet extends HttpServlet {

         private static final long serialVersionUID = 1L;

         ProductDao productDao = new ProductDao();

 

         public ProductServlet() {

                   super();

         }

 

         protected void doGet(HttpServletRequest request,

                            HttpServletResponse response) throws ServletException, IOException {

                   request.setCharacterEncoding("utf-8");

                   response.setCharacterEncoding("utf-8");

                   String method = request.getParameter("method");

                   

                   switch (method) {

                   case "all":

                            queryAllProduct(request, response);

                            break;

                   case "add":

                            addProduct(request, response);

                            break;

                   case "del":

                            delProduct(request, response);

                            break;

                   case "update":

                            updateProduct(request, response);

                            break;

                   case "byid":

                            queryProductById(request, response);

                            break;

                   case "batchDel":

                            batchDelProduct(request, response);

                            break;

                   case "byPage":

                            queryProductByPage(request,response);

                            break;

                   }

         }

 

         private void queryProductByPage(HttpServletRequest request,

                            HttpServletResponse response) throws ServletException, IOException {

                   //得到当前页数

                   String currPage=request.getParameter("currentPage");

                   int currentPage=1;

                   if(currPage!=null)

                   {

                            System.out.println(currPage);

                            currentPage=Integer.parseInt(currPage);

                   }

                   //得到总记录数量

                   int totalCount=0;

                   List<Product> products=productDao.queryAllProducts();

                   if(products!=null)

                   {

                            totalCount=products.size();

                   }

                   //页面大小——每页显示几条记录

                   int pageSize=5;

                   //创建页处理对象

                   Page page=new Page(currentPage,pageSize,totalCount);

                   //得到当前页显示的记录索引（从0开始）

                   int beginIndex=page.getBeginIndex();

                  //得到当前页的商品列表

                   List<Product> productByPage = productDao.queryProductByPage(beginIndex, pageSize);

                   //将商品信息和页对象放入request作用域，供页面展示使用

                   request.setAttribute("productList", productByPage);

                   request.setAttribute("page", page);

                   //转向页面

                   request.getRequestDispatcher("/product/m_productMain.jsp").forward(request, response);

         }

 

         private void queryAllProduct(HttpServletRequest request,

                            HttpServletResponse response) throws ServletException, IOException {

                   List<Product> products = productDao.queryAllProducts();

                   request.setAttribute("productList", products);

                   request.getRequestDispatcher("/ProductServlet?method=byPage").forward(request, response);

         }

 

         // 增加商品（涉及上传图片文件）

         private void addProduct(HttpServletRequest request,

                            HttpServletResponse response) throws IOException {

 

                   boolean isMultipart = ServletFileUpload.isMultipartContent(request);

                   // 判断是带文件上传的表单？还是普通表单

                   boolean isuploadSuccess = false; // 设置上传成功的标志

                   File imageFile = null; // 图片文件对象

                   String proname = null; // 商品名称

                   String pronumber = null; // 商品数量

                   String proprice = null; // 商品价格

                   String prosupplier = null; // 商品供应商

                   String propic = null; // 商品的图片文件名

                   String destFileName = null; // 重新组织的商品文件名

 

                   try {

 

                            String uploaddir = request.getServletContext().getRealPath(

                                               "/images");

                            // 设置上传路径字符串

                            File upFile = new File(uploaddir); // 创建路径对应的文件对象

                            if (!upFile.exists()) { // 如果路径不存在，就逐级创建

                                     upFile.mkdirs();

                            }

                            if (isMultipart == true) { // 若是带文件上传的表单，继续

                                     FileItemFactory factory = new DiskFileItemFactory(); // 创建文件项工厂

                                     ServletFileUpload upload = new ServletFileUpload(factory); // 创建文件上传对象

                                     List<FileItem> items; // 表单项列表

                                     items = upload.parseRequest(request); // 解析请求对象，得到各个表单项

 

                                     // 对表单里的各个项目进行分析：

                                     // 如果是普通文本框，则取得其字段名称，根据名称获得其值

                                     // 如果是文件上传项，则取得文件名，对文件名进行处理，然后上传

                                     Iterator<FileItem> it = items.iterator();

                                     while (it.hasNext()) { // 单文件上传

                                               FileItem item = (FileItem) it.next();

 

                                               // 处理普通文本

                                               String fileldName = item.getFieldName(); // 得到域名称

                                               switch (fileldName) // 根据名称取得其数据，由二进制数据转换成UTF-8编码

                                               {

                                               case "proname":

                                                        proname = new String(item.getString().getBytes(

                                                                           "iso-8859-1"), "utf-8");

                                                        break;

                                               case "proprice":

                                                        proprice = new String(item.getString().getBytes("iso-8859-1"), "utf-8");