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#2
会龙庄2019-04-25 15:09
文件上传现在有很多插件可以实现。前段时间刚做了一个文件上传，采用的是JSP+Servlet完成上传，用的fileupload插件。我这个同时将文件信息存到了数据库，存数据库的就就注册信息一致。附上源码，希望能够帮助到你。
public class addNewBookServlet extends HttpServlet { private static final long serialVersionUID = 1L; // 上传文件存储目录 private static final String UPLOAD_DIRECTORY = "upload"; // 上传配置 private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB /** * @see HttpServlet#HttpServlet() */ public addNewBookServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub if (!ServletFileUpload.isMultipartContent(request)) { // 如果不是则停止 PrintWriter writer = response.getWriter(); writer.println("Error: 表单必须包含 enctype=multipart/form-data"); writer.flush(); return; } response.setContentType("text/html;charset=utf-8"); PrintWriter writer=response.getWriter(); StringBuffer fileStr=new StringBuffer(); //上传的文件名，最后输出用 // 配置上传参数 DiskFileItemFactory factory = new DiskFileItemFactory(); // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中 factory.setSizeThreshold(MEMORY_THRESHOLD); // 设置临时存储目录 factory.setRepository(new File(System.getProperty("))); ServletFileUpload upload = new ServletFileUpload(factory); // 设置最大文件上传值 upload.setFileSizeMax(MAX_FILE_SIZE); // 设置最大请求值 (包含文件和表单数据) upload.setSizeMax(MAX_REQUEST_SIZE); // 中文处理 upload.setHeaderEncoding("UTF-8"); // 构造临时路径来存储上传的文件 // 这个路径相对当前应用的目录 String uploadPath = LM.toChinese(request.getServletContext().getRealPath("") + LM.toChinese(File.separator + UPLOAD_DIRECTORY)); // 如果目录不存在则创建 File uploadDir = new File(uploadPath); if (!uploadDir.exists()) { uploadDir.mkdir(); } try { // 解析请求的内容提取文件数据 List<FileItem> formItems = upload.parseRequest(new ServletRequestContext(request)); if (formItems != null && formItems.size() > 0) { // 迭代表单数据 for (FileItem item : formItems) { // 处理不在表单中的字段 if (!item.isFormField()) { String fileName = new File(item.getName()).getName(); String filePath = uploadPath + File.separator + fileName; String bookname=""; String bookwriter=""; String bookprice=""; Book_message book=new Book_message(); BookImple bookim=new BookImple(); NowTime time=new NowTime(); String ts=time.getDate(); File storeFile = new File(filePath); HttpSession session=request.getSession(); //String fieldName=item.getFieldName(); Iterator<FileItem> iterator=formItems.iterator(); while(iterator.hasNext()){ FileItem FileItem=iterator.next(); if(FileItem.getFieldName().equals("bookname")){ bookname=LM.toChinese(FileItem.getString()); session.setAttribute("bookname", bookname); System.out.println("添加书籍名称为："+bookname); }else if(FileItem.getFieldName().equals("bookwriter")){ bookwriter=LM.toChinese(FileItem.getString()); System.out.println("添加数据作者为："+bookwriter); session.setAttribute("bookwriter", bookwriter); }else if(FileItem.getFieldName().equals("bookprice")){ bookprice=FileItem.getString(); } } book=bookim.addNewBook(bookname, bookwriter, bookprice,filePath,ts); // 在控制台输出文件的上传路径 System.out.println(filePath); System.out.println("文件上传成功"); // 保存文件到硬盘 item.write(storeFile); request.setAttribute("message","文件上传成功!"); } } } } catch (Exception ex) { request.setAttribute("message","错误信息: " + ex.getMessage()); } // 跳转到 message.jsp request.getServletContext().getRequestDispatcher("/showaddbookmessage").forward(request, response); } } |
