Eclipse工作空間問題

Question

我正在編寫一個servlet，它將幫助從html窗體上傳文件。我正在使用apache commons fileUpload庫。

問題是當我上傳文件時，雖然我已授予所有文件夾的權限，但獲得了拒絕訪問權限以寫入Web內容中的文件夾。此外，我在同一個工作區中有另一個項目，其中正在對另一個文件夾執行類似的上傳操作並執行。

java.io.FileNotFoundException: C:\Users\Veera\VirtualClassroom\IP_Project1.1\WebContent\Videos\Kannada\Jodha Akbar (Access is denied.) 
    at java.io.FileOutputStream.<init>(FileOutputStream.java:205) 
    at java.io.FileOutputStream.<init>(FileOutputStream.java:157) 
    at org.apache.commons.fileupload.disk.DiskFileItem.write(DiskFileItem.java:426) 
    at codes.UploadVideo.doPost(UploadVideo.java:81) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    at java.lang.Thread.run(Thread.java:811) 

這裏有一個代碼snippet.The doPost方法

protected void doPost(HttpServletRequest request, 
      HttpServletResponse response) throws ServletException, IOException { 
     // TODO Auto-generated method stub 
     if (!(ServletFileUpload.isMultipartContent(request))) { 

     } else { 
      try { 
       ServletFileUpload in = new ServletFileUpload(
         new DiskFileItemFactory()); 
       System.out.println("hello"); 
       String song_name = null, movie = null, category = null; 
       List inp = in.parseRequest(request); 
       Iterator it = inp.iterator(); 
       FileItem fi = null; 
       while (it.hasNext()) { 
        fi = (FileItem) it.next(); 
        if (fi.isFormField()) { 
         if (fi.getFieldName().equals("song_name")) 
          song_name = fi.getString(); 
         else if (fi.getFieldName().equals("film")) 
          movie = fi.getString(); 
         else if (fi.getFieldName().equals("group")) 
          category = fi.getString(); 
         System.out.println(song_name + movie + category); 

        } else { 

         String filename = fi.getName(); 

         boolean status = new File(
           "C:/Users/Veera/VirtualClassroom/IP_Project1.1/WebContent/Videos/" 
             + category + "/" + movie).isDirectory(); 
         System.out.println(status); 
         File fw = new File(
           "C:/Users/Veera/VirtualClassroom/IP_Project1.1/WebContent/Videos/" 
             + category + "/" + movie + "/" 
             + filename); 
         fi.write(fw); 

        } 

       } 
      } catch (Exception e) { 
       // TODO: handle exception 
       e.printStackTrace(); 
       System.out.println(e.getMessage()); 
      } 


     } 

Answer 1

很可能是下列條件之一爲真：

• 爲文件對象創建的路徑並不代表一個有效的文件。這可能是因爲status標誌設置爲isDirectory()方法的返回值而被忽略。
• 與上面相關的是，路徑是使用類別和電影名稱構建的，除了文件名。任一參數可能無效或爲空，導致路徑不正確。

在嘗試創建文件之前，糾正這些問題需要驗證文件路徑的所有片段是否有效。