Question

这是Java类中的代码。        图片文件夹中存在redflaglight.png图片
       找不到文件Null指针异常位于
       inputStream =新的FileInputStream（path）;        Struts2.3.5 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。从Struts2.2.1升级到struts2.3.5

Answer 1

如果您正在服务器上运行此代码并使用相对路径，则文件应位于服务器目录内。像：-

your_server_path/pages/appsresponse/images

问题是您要将图像保留在工作区中，需要将其保留在服务器目录中。

编辑
验证路径

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

inputStream =新的FileInputStream（path）不起作用

1 个答案: