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");