在上傳文件空指針異常附近文件路徑

在這裏我使用struts2來上傳文件我得到空指針異常附近字符串filePath當我要上傳我的文件，可以anybbody PLZ幫我在這個問題.....我想找到我上傳的內容的擴展名。在上傳文件空指針異常附近文件路徑

public class ImportAction extends ActionSupport implements ServletRequestAware { 

     public File getUploadfile() { 
      return uploadfile; 
     } 

     public String getUploadFileName() { 
      return uploadFileName; 
     } 

     public void setUploadFileName(String uploadFileName) { 
      this.uploadFileName = uploadFileName; 
     } 

     public void setUploadfile(File uploadfile) { 
      this.uploadfile = uploadfile; 
     } 
     private static final long serialVersionUID = 1L; 
     private LoginBean bean; 
     private File uploadfile; 

     public String getFileContentType() { 
      return fileContentType; 
     } 

     public void setFileContentType(String fileContentType) { 
      this.fileContentType = fileContentType; 
     } 
     private String uploadFileName; 
     private String fileContentType; 
     private HttpServletRequest servletRequest; 
     RegisterDAO dao = new RegisterDAO(); 

     public LoginBean getBean() { 
      return bean; 
     } 

     public void setBean(LoginBean bean) { 
      this.bean = bean; 
     } 

     /** 
     * 
     * @return 
     * @throws 
     * Exception 
     */ 
     @SuppressWarnings("unchecked") 
     @Override 
     public String execute() throws Exception { 
      try { 
       String filePath = servletRequest.getSession().getServletContext().getRealPath("/"); 
       System.out.println("Server path:" + filePath); 
       File fileToCreate = new File(filePath, this.uploadFileName); 
       FileUtils.copyFile(this.uploadfile, fileToCreate); 
      } catch (Exception e) { 
       e.printStackTrace(); 
       addActionError(e.getMessage()); 
       return INPUT; 
      } 
      Model m = new Model(); 
      String result = m.fileimport(uploadfile, uploadFileName); 
      if (result.equals(SUCCESS)) { 
       return SUCCESS; 
      } else { 
       addActionError(getText(result)); 
       return "failure"; 
      } 
     } 

     @Override 
     public void validate() { 
      System.out.println("inside validate of LA"); 
     } 

     @Override 
     public void setServletRequest(HttpServletRequest servletRequest) { 
      this.servletRequest = servletRequest; 
     } 
    }

來源

2013-10-28 user2838630

是否掌握了有效/非空的servletRequest對象？ –

對不起，我沒有得到這個評論謝謝 – user2838630

只是檢查你的servletRequest對象是否爲非null。嘗試把一個空，如果檢查。 –

很有可能您的servletRequest爲空，因此導致空指針異常。你可能不得不通過上下文來初始化它。

來源

2013-10-28 12:30:15

可能üPLZ exp我與示例感謝 – user2838630

這是錯誤的：

private File uploadfile; 
private String uploadFileName; 
private String fileContentType;

應該（與二傳手）變爲：

private File uploadFile; /* Uppercase F */ 
private String uploadFileName; 
private String uploadContentType; /* "upload" prefix */

在上傳文件空指針異常附近文件路徑

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