java通过commons-fileupload实现多张图片的上传（servlet）

//添加食品信息
			private void addProduct(HttpServletRequest request, HttpServletResponse response) throws IOException{
		PrintWriter out = response.getWriter();
		/*Date date=new Date();
		SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		String date1=format.format(date);
		String productName=request.getParameter("produceName");
		int typeid=Integer.parseInt(request.getParameter("typename"));
		String details=request.getParameter("details");
		Float price =Float.parseFloat(request.getParameter("price"));
		int stock=Integer.parseInt(request.getParameter("stock"));
		String fileName=request.getParameter("fileName");
		fileName="images_ganguo/"+fileName;
		ProductInfo product=new ProductInfo();
		product.setP_typeId(typeid);
		product.setProductName(productName);
		product.setPrice(price);
		product.setDetails(details);
		product.setStock(stock);
		product.setDate(date1);
		product.setFileName(fileName);
		int rel=proService.addProductInfo(product);
		if(rel>0){
			//添加商品成功之后转发到查询所有的商品界面
			out.print("<script>alert('恭喜您，添加商品成功！');location.href='ProductInfoServlet?tag=show';</script>");
		}else{
			out.print("<script>alert('很抱歉，添加商品失败！');location.href='ProductInfoServlet?tag=show';</script>");

		}*/
		
		String typename="";//类型名称
		String brand="";//品牌
		String produceName="";//商品名称
        String details="";//商品详情
        String price="";//价格
        int stock=0;//库存
		request.setCharacterEncoding("utf-8");
		String uploadFileName="";//上传的文件名(大图)
		String uploadFileName1="";//上传的文件名(小图1)
		String uploadFileName2="";//上传的文件名(小图2)
		String uploadFileName3="";//上传的文件名(小图3)
		String uploadFileName4="";//上传的文件名(小图4)
		String fileName="";//表单字段元素的name属性值
		String filedName="";
		String picPath="";
		//请求信息中的内容是否是multipart类型
		boolean isMultipart =ServletFileUpload.isMultipartContent(request);
		//上传文件的存储路径（服务器文件系统上的绝对文件路径）
		String uploadFilePath=request.getSession().getServletContext().getRealPath("upload/");
		if(isMultipart){
			FileItemFactory factory=new DiskFileItemFactory();
			ServletFileUpload  upload=new ServletFileUpload(factory);
			try
			{
				//解析from表单中所有文件
				List<FileItem> items=upload.parseRequest(request);
				Iterator<FileItem> iter=items.iterator();
				while(iter.hasNext()){
					FileItem item=(FileItem)iter.next();
					if(item.isFormField()){//判断，是普通表单
						fileName=item.getFieldName();//表单字段的name属性
						if(fileName.equals("typename")){
							typename=item.getString("utf-8");
						}else if(fileName.equals("brand")){
							brand=item.getString("utf-8");
						}else if(fileName.equals("produceName")){
							produceName=item.getString("utf-8");
						}else if(fileName.equals("details")){
							 details=item.getString("utf-8");
						}else if(fileName.equals("price")){
							price=item.getString("utf-8");
						}else if(fileName.equals("stock")){
							stock=Integer.parseInt(item.getString("utf-8"));
						}
					}else{
						//文件表单字段
						//表单字段的name属性
						fileName=item.getFieldName();
						if(fileName.equals("bigfile")){
						 filedName=item.getName();
						if(fileName!=null&&!filedName.equals("")){
								File fullFile=new File(item.getName());
								File saveFile=new File(uploadFilePath,fullFile.getName());
								item.write(saveFile);
								uploadFileName=fullFile.getName();
								//ServletContext application=this.getServletContext();
								picPath=saveFile.toString();
						}
						}else if(fileName.equals("smallfile1")){
							filedName=item.getName();
							if(fileName!=null&&!filedName.equals("")){
									File fullFile=new File(item.getName());
									File saveFile=new File(uploadFilePath,fullFile.getName());
									item.write(saveFile);
									uploadFileName1=fullFile.getName();
									//ServletContext application=this.getServletContext();
									picPath=saveFile.toString();
							}
						}else if(fileName.equals("smallfile2")){
							filedName=item.getName();
							if(fileName!=null&&!filedName.equals("")){
									File fullFile=new File(item.getName());
									File saveFile=new File(uploadFilePath,fullFile.getName());
									item.write(saveFile);
									uploadFileName2=fullFile.getName();
									//ServletContext application=this.getServletContext();
									picPath=saveFile.toString();
							}
						}else if(fileName.equals("smallfile3")){
							filedName=item.getName();
							if(fileName!=null&&!filedName.equals("")){
									File fullFile=new File(item.getName());
									File saveFile=new File(uploadFilePath,fullFile.getName());
									item.write(saveFile);
									uploadFileName3=fullFile.getName();
									//ServletContext application=this.getServletContext();
									picPath=saveFile.toString();
							}
						}
					}
				}
			}catch(Exception ex){
				ex.printStackTrace();
			}
			Date date=new Date();
			SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
			String date1=format.format(date);
			ProductInfo product=new ProductInfo();
			int typeid=Integer.parseInt(typename);
			product.setP_typeId(typeid);
			product.setProductName(produceName);
			float price1=Integer.parseInt(price);
			product.setPrice(price1);
			product.setDetails(details);
			product.setStock(stock);
			product.setDate(date1);
			product.setFileName("upload/"+uploadFileName);
			product.setFileName_1("upload/"+uploadFileName1);
			product.setFileName_2("upload/"+uploadFileName2);
			product.setFileName_3("upload/"+uploadFileName3);
			int rel=proService.addProductInfo(product);
			if(rel>0){
				//添加商品成功之后转发到查询所有的商品界面
				out.print("<script>alert('恭喜您，添加商品成功！');location.href='ProductInfoServlet?tag=show';</script>");
			}else{
				out.print("<script>alert('很抱歉，添加商品失败！');location.href='ProductInfoServlet?tag=show';</script>");


			}
		}
		
		
	}