Commons FileUpload

Apache 官网使用指南：http://commons.apache.org/fileupload/using.html

Apache Common fileUpload API 详解：http://www.blogjava.net/gembin/archive/2008/05/08/199240.html

JSP页面：

<form id="form1" name="form1" action="formProcess" method="post" enctype="multipart/form-data">File Name: <input type="text" name="name" value="<%=request.getAttribute("line")%>" /> <br />        File: <input type="file" name="myFile" /> <br />        <input type="submit" value="Process" /></form>

Servlet 处理文件上传：

public class FormProcess extends HttpServlet {String uploadPath = "D:\\test";protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("UTF-8");String line = null;String fileName = null;File fullFile = null;try {// Create a factory for disk-based file itemsDiskFileItemFactory factory = new DiskFileItemFactory();// Set factory constraints// Apache文件上传组件在解析和处理上传数据中的每个字段内容时，需要临时保存解析出的数据。因为Java虚拟机默认可以使用的内存空间是有// 限的（笔者测试不大于100M），超出限制时将会发生“java.lang.OutOfMemoryError”错误factory.setSizeThreshold(4096); // your max memory// size.设置最多只允许在内存中存储的数据,单位:字节// 设置setSizeThreshold方法中提到的临时文件的存放目录，这里要求使用绝对路径// 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录// factory.setRepository(new File(uploadPath));// Create a new file upload handlerServletFileUpload upload = new ServletFileUpload(factory);// Set overall request size constraint.设置允许用户上传文件大小,单位:字节upload.setSizeMax(8194304);// Parse the requestList /* FileItem */items = null;items = upload.parseRequest(request);// Process the uploaded itemsIterator iter = items.iterator();while (iter.hasNext()) {FileItem item = (FileItem) iter.next();if (item.isFormField()) {/* processFormField(item); */// Process a regular form fieldString name = item.getFieldName();line = item.getString("UTF-8");System.out.println(name + ": " + line);} else {/* processUploadedFile(item); */String fieldName = item.getFieldName();fileName = item.getName();fullFile = new File(fileName);File uploadedFile = new File(uploadPath, fullFile.getName());System.out.println(uploadedFile.getAbsolutePath());item.write(uploadedFile);}}} catch (FileUploadException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}request.setAttribute("line", line);request.setAttribute("fileName", fullFile.getCanonicalPath());this.getServletConfig().getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);}@Overridepublic void init() throws ServletException {File uploadDir = new File(uploadPath);if (!uploadDir.exists()) {uploadDir.mkdirs();}}}