inputStream = new FileInputStream(path) 不起作用

Question

1. 这是Java Class中的代码。 redflaglight.png图像存在于图像文件夹中 找不到
   空指针异常在
   输入流 = 新的文件输入流(路径(; 支柱2.3.5 Java7

   public String createRootPath() throws UnsupportedEncodingException {  
   String rootPath = "";  
   String path = ExportExcelBusiness.class.getProtectionDomain()  
   .getCodeSource().getLocation().getPath();  
   File f = new File(path);  
   String ff = f.getParent();  
   f = new File(ff);  
   ff = f.getParent();  
   f = new File(ff);  
   ff = f.getParent();  
   f = new File(ff);  
   ff = f.getParent();  
   f = new File(ff);  
   ff = f.getParent();    
   f = new File(ff);  
   ff = f.getParent();  
   f = new File(ff);  
   ff = f.getParent();  
   String decodedPath = URLDecoder.decode(ff, "UTF-8");  
   rootPath = decodedPath.replace('\', '/');  
   rootPath += "/WebContent/pages/appsresponse/images";  
   return rootPath;  
   }  
   path = createRootPath()+ "/up_arrow_export.png";    
   InputStream inputStream = null;    
   int pictureIdx = 0;  
   byte[] bytes;  
   try {  
   inputStream = new FileInputStream(path);  
   bytes = IOUtils  
   .toByteArray(inputStream);  
   pictureIdx = wb.addPicture(bytes,
   Workbook.PICTURE_TYPE_PNG);  
   } finally {  
   if (inputStream != null) {  
   inputStream.close();  
   }  
   }
   

   尽管路径中存在文件，但无法获取该文件。这是在从 Struts2.2.1 升级到 struts2.3.5 后开始

   的

Answer 1

如果您在服务器上运行此代码并使用相对路径，那么您的文件应该在服务器目录中。

your_server_path/pages/appsresponse/images

问题是您将图像保存在工作区中，您需要将其保存在服务器目录中。

编辑
验证您的路径

File file=new File(path);
System.out.print(file.getAbsolutePath()); //check whether file is present at this path or not