commons-fileupload-1.4使用及问题

文件上传

使用commons-fileupload-1.4控件及依赖的commons-io-2.6控件

jsp页面中内容

<form action="../servlet/FileUpdate" method="post" enctype="multipart/form-data">
        <div align="center">
            <fieldset style="width:80%">
                <legend>上传文件</legend><br/>
                    <div align="left">上传文件1</div>
                    <div align="left">
                        <input type="file" name="file1"/>
                    </div>

                    <div>
                        <div align='left'>
                            <input type='submit' value="上传文件"/>
                        </div>
                    </div>
            </fieldset>
        </div>
 </form>

servlet

 public void doGet(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
         response.setContentType("text/html;charset=utf-8");
         PrintWriter out = response.getWriter();
         // 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);
         // Create a new file upload handler
         ServletFileUpload upload = new ServletFileUpload(factory);
         upload.setHeaderEncoding("utf-8");
         // Parse the request
         String saveName = "";
         try {
             List<FileItem> items = upload.parseRequest(request);
             for (FileItem item : items) {
                 if(item.isFormField()){//如果只是表单中信息,不是表单文件
                     String fieldName = item.getFieldName();
                     String fieldValue = item.getString();
                     out.print("<br>fieldName: "+fieldName+",--fieldValue: "+fieldValue);
                 }else{
                     InputStream inputStream = item.getInputStream();
                     //得到保存文件的路径
                     String realpath=this.getServletContext().getRealPath("update");
                     //得到上传的文件的名字，可能显示的是路径，所以需要取出文件名
                     String allFilePath = item.getName();
                     //getName()值为绝对路径！！！下面代码转换取文件名
                     String fileName = null;
                     int ind = allFilePath.lastIndexOf("\\");
                     if (ind != -1) {
                         fileName = allFilePath.substring(ind + 1);
                     }else {
                         fileName = allFilePath;
                     }

                     out.print("<br>上传的文件名: "+fileName);
                     //读取的不能是目录，应该加上文件名
                     File file=new File(realpath + "\\" + fileName);
                     if(file.getParentFile().exists()){
                         file.createNewFile();//创建文件
                     }else {
                         file.getParentFile().mkdirs();//创建父级文件路径
                         file.createNewFile();//创建文件
                     }
                     FileOutputStream fos=new FileOutputStream(file);
                     byte[] bytes= new byte[1024];
                     int len=0;
                     //写入文件
                     while((len=inputStream.read(bytes))!=-1){
                         fos.write(bytes, 0, len);
                     }

                     inputStream.close();
                     fos.close();
                     out.print("<h3>"+allFilePath+"文件上传成功</h3>");
                 }
             }

         } catch (FileUploadException e) {
             e.printStackTrace();
         } catch (FileNotFoundException e) {
             e.printStackTrace();
             System.out.println(saveName);
         }
    }

web.xml

<servlet>
    <servlet-name>FileUpdate</servlet-name>
    <servlet-class>com.oneself.shopping.servlet.FileUpdate</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>FileUpdate</servlet-name>
    <url-pattern>/servlet/FileUpdate</url-pattern>
</servlet-mapping>

问题

　　java.io.FileNotFoundException: D:\update (拒绝访问。)

　　FileOutputStream读取流的时候如果是文件夹，就会出此错误。读取的目录后面要加文件名，如下：

  File file=new File(realpath + "\\" + fileName);
                     if(file.getParentFile().exists()){
                         //file.getParentFile().mkdirs();//创建父级文件路径
                         file.createNewFile();//创建文件
                         System.out.println(file.exists());
                     }else {
                         file.getParentFile().mkdirs();//创建父级文件路径
                         file.createNewFile();//创建文件
                     }
                     FileOutputStream fos=new FileOutputStream(file);