文件上传 Servlet
普通Servlet上传，需要两个包：commons-fileipload和commons-iorServlet doPost：
public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//实例化一个文件工厂FileItemFactory factory = new DiskFileItemFactory();//配置上传组件ServletFileUploadServletFileUpload upload = new ServletFileUpload(factory);try {//从request得到所有上传域的列表List<FileItem> list = upload.parseRequest(request);for (FileItem item : list) {//如果是上传域的文件域if (!item.isFormField()) {//上传于的NameString fileName = item.getName();//截取扩展名int idx = fileName.lastIndexOf(".");String extension = fileName.substring(idx);//name文件名String name = new Date().getTime() + extension;//得到文件夹的物理路径String path = this.getServletContext().getRealPath("\\upload");//创建一个FileFile file = new File(path + "\\" + name);try {//写入文件item.write(file);} catch (Exception e) {e.printStackTrace();}}}} catch (FileUploadException e) {e.printStackTrace();}}
Jsp： 注意Form表单里的属性：enctype="multipart/form-data"
<form action="servlet/Upload" name="form1" method="post"enctype="multipart/form-data"><table><tr><td>上传:</td><td><input type="file" name="upload"></td></tr><tr><td colspan="2"><input type="submit" value="上传"></td></tr></table></form>
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