相關 jar 包:java
commons-beanutils.jarapp
commons-collections.jardom
commons-fileupload-1.2.2.jarcode
commons-io-2.4.jarorm
commons-lang.jar對象
commons-logging.jarblog
dom4j-1.6.1.jarip
ezmorph-1.0.6.jarutf-8
jar 包下載:http://files.cnblogs.com/files/liaolongjun/common-jar.zipget
void upload() throws Exception { for (FileItem item : FileUtil.getFileItems(request)) { ServletContext sc = request.getServletContext(); String path = sc.getRealPath("upload"); // 上傳的文件存儲路勁 String filename = item.getName(); File file = new File(path + File.separator + filename); System.out.println(file); if (file.exists() || file.createNewFile()) { item.write(file); // 保存文件 } // 輸出 Base64 - item.get() 獲取 byte[] System.out.println("data:" + item.getContentType() + ";base64," + new String(Base64.encodeBase64(item.get()))); } } void download() throws Exception { String filepath = request.getParameter("filepath"); File file = new File(filepath); response.reset(); response.setContentType("application/x-msdownload"); response.addHeader("Content-Disposition", "attachment; filename=\"" + URLEncoder.encode(file.getName(), "utf-8") + "\""); int fileLength = (int) file.length(); response.setContentLength(fileLength); FileUtil.i2o(new BufferedInputStream(new FileInputStream(file)), response.getOutputStream()); }
FileUtil.getFileItems 方法:
/** * DiskFileItemFactory 爲解析器提供解析時的缺省的配置 <br> * ServletFileUpload 解析 InputStream,將一個表單域(好比,一個文件輸入框)中的數據封裝到一個FileItem對象上<br> * FileItem對象上提供了相應的方法來獲取表單域中的數據 */ public static List<FileItem> getFileItems(HttpServletRequest request) { List<FileItem> fileItems = new ArrayList<>(); try { ServletFileUpload sfu = new ServletFileUpload(new DiskFileItemFactory()); for (Object obj : sfu.parseRequest(request)) { FileItem item = (FileItem) obj; if (!item.isFormField()) { // 是否普通表單域 fileItems.add(item); } } } catch (Exception e) { throw new RuntimeException(e); } return fileItems; }
FileUtil.i2o 方法:
public static void i2o(InputStream is, OutputStream os) { try { byte[] b = new byte[1024 * 1024]; // 一次讀取1M int n = 0; while ((n = is.read(b)) != -1) os.write(b, 0, n);// 這個n還不能去了 is.close(); os.flush(); os.close(); } catch (IOException e) { e.printStackTrace(); } }