JSP文件上传与下载

首先需要第三方的smartupload.jar包

（1）?????? 文件的上传

// 1.定义SmartLoad对象SmartUpload upload = new SmartUpload();upload.setCharset("utf-8");// 设置编码格式// 2.初始化uploadupload.initialize(this.getServletConfig(), request, response);// 3.上传的配置upload.setMaxFileSize(1024 * 1024 * 1);// 设置文件大小upload.setTotalMaxFileSize(1024 * 1024 * 10); // 设置文件总的大小upload.setAllowedFilesList("jpg,gif");// 设置文件上传格式try {upload.setDeniedFilesList("bat,exe");// 设置不能上传的文件格式} catch (SQLException e) {e.printStackTrace();}// 4.获取request对象Request req = upload.getRequest();try {upload.upload();// 上传文件upload.save("/upload"); // 保存文件到根目录下(服务器下项目的根目录下)} catch (SmartUploadException e) {e.printStackTrace();}String filename = upload.getFiles().getFile(0).getFileName();// 获得上传的文件名//获得用户输入的参数信息String name = req.getParameter("name");double price = Double.parseDouble(req.getParameter("price"));int num = Integer.parseInt(req.getParameter("num"));String size = req.getParameter("size");String picture = filename;//实例化一个对象ClothBean cloth = new ClothBean(name, price, num, size, picture);ClothDAO clothDao = new ClothDAO();//添加衣服boolean b = clothDao.addCloth(cloth);if (b) {request.getRequestDispatcher("ShowClothServlet").forward(request,response);}

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（2）?????? 文件的下载

// 下载服务器上的图片String filename = request.getParameter("filename");// 得到下载文件的名字// 创建一个实例SmartUpload upload = new SmartUpload();// 初始化upload.initialize(this.getServletConfig(), request, response);// 禁止浏览器打开文件upload.setContentDisposition(null);// 从服务器上下载文件try {upload.downloadFile("/upload/" + filename);} catch (SmartUploadException e) {e.printStackTrace();}

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