Java学习，文件上传

Java学习

学到文件上传这里，使用Apache的FileUpload工具，地址链接

protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
        System.out.println(isMultipart);
        if (isMultipart) {
            ServletFileUpload fileUpload = new ServletFileUpload();
            InputStream is = null;
            FileOutputStream out = null;
            try {
                FileItemIterator itemIterator = fileUpload.getItemIterator(request);
                while (itemIterator.hasNext()) {
                    FileItemStream stream = itemIterator.next();
                    // 使用Multipart之后，说明使用字节流传递，所以需要将其转化为输入流处理
                    is = stream.openStream();
                    // 是否是普通的表单域
                    if (stream.isFormField()) {
                        // 如果是表单域，可以获取表单域的名称
                        System.out.println(stream.getFieldName());
                        // 通过Streams的asString方法，可以将流中的数据转换为String
                        System.out.println("value = " + Streams.asString(is));
                    } else {
                        // 如果不是表单域，则可以获取文件的名称
                        String name = stream.getName();
                        String path = request.getSession().getServletContext().getRealPath("/file");
                        path = path + "/" + name.substring(name.lastIndexOf("\\") + 1, name.length());
                        out = new FileOutputStream(path);
                        System.out.println(path);
                        byte[] bs = new byte[1024];
                        int length = 0;
                        while ((length = is.read(bs)) > 0) {
                            out.write(bs, 0, length);
                        }
                    }
                }
            } catch (FileUploadException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {
                if (is != null) {
                    is.close();
                }
                if (out != null) {
                    out.close();
                }
            }
        }
    }