使用org.apache.commons.fileupload上传文件-优快云博客

本文链接：https://blog.youkuaiyun.com/wenj91/article/details/50100369

本文介绍了一个使用Java实现将文件上传至指定目录的方法。通过ServletFileUpload类和DiskFileItemFactory工厂，该方法能够解析HTTP请求并处理多部分内容，最终将上传的文件保存至指定路径。

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/**
	 * 
	 * @param req HttpServletRequest
	 * @param path 需要上傳到的目錄
	 * @return 返回上傳的文件所在的目錄
	 */
	@SuppressWarnings("unchecked")
	public static String uploadFile(HttpServletRequest req, String path) {

		boolean isMultipart = ServletFileUpload.isMultipartContent(req);
		String strTemp = req.getSession().getServletContext()
				.getRealPath("WEB-INF");
		if (isMultipart) {
			// The simplest case
			// Create a factory for disk-based file items
			DiskFileItemFactory factory = new DiskFileItemFactory();

			// Configure a repository (to ensure a secure temp location is used)
			// ServletContext servletContext =
			// this.getServletConfig().getServletContext();
			// File repository = (File)
			// servletContext.getAttribute("javax.servlet.context.tempdir");
			// factory.setRepository(repository);

			File file = new File(strTemp);
			factory.setRepository(file);
			// Create a new file upload handler
			ServletFileUpload upload = new ServletFileUpload(factory);

			// Parse the request
			List<FileItem> items = null;
			try {
				items = upload.parseRequest(req);
			} catch (FileUploadException e1) {
				e1.printStackTrace();
				return null;
			}

			for (Iterator<FileItem> it = items.iterator(); it.hasNext();) {
				FileItem fi = it.next();
				try {
					String filepath = req.getSession().getServletContext()
							.getRealPath(path);
					File folder = new File(filepath);
					if (!folder.exists()) {
						folder.mkdir();
					}
					// System.out.println(strTemp);
					UUID uuid = UUID.randomUUID();
					String finalFileName = uuid + "-" +fi.getName();;
					fi.write(new File(filepath + File.separator + finalFileName));
					System.out.println("上傳文件成功!");
					return path + "/" + finalFileName;
				} catch (Exception e) {
					e.printStackTrace();
					return null;
				}
			}
		}

		return null;
	}