从FileItem获取文件并将该文件保存到路径

Question

我需要将图像保存到我的桌面上，但我无法获取该图像文件，当我保存它时，我什么也不保存，一个空文件，我不知道如何从FileItem获取该文件。

    for (FileItem lFileItem: c.emptyIfNull(pImageLogo))
    {
        long lFileSize = lFileItem.getSize();
        String lFileName = lFileItem.getName();
        String lExtensionFile = FilenameUtils.getExtension(lFileName);
        String lContentType = lFileItem.getContentType();

        if (lContentType.startsWith("image/")) {

            if (lFileSize < 100 || lFileSize > Integer.valueOf(lLimitFileSize))
            {                           
                lShowAlert=c.msg("userReg.alertSizeFileErrorPart1","File size must be smaller than ") + Integer.valueOf(lLimitFileSize)/1000000 + c.msg("userReg.alertSizeFileErrorPart2","MB and greater than 1KB ");
                throw new ErrorControl(lShowAlert);
                break;
            }

            if (lFileSize<=0) break;    
            c.log(this, "file size="+lFileSize+"  max allowed="+lLimitFileSize);

            File lFile = new File(logoClientsFolder+"logo_"+ lIdClient + "." + lExtensionFile);

            if(lFile.createNewFile())
            {
                System.out.println("File created: " + lFile.getName());
            }
        } else {
            System.out.println("IS NOT AN IMAGE");
        }
    }

你能帮帮我吗？谢谢!

Answer 1

您只需创建文件，但不向其写入数据，您需要的内容如下：

final Path path = Paths.get(filename);
OutputStream outStream = Files.newOutputStream(path, StandardOpenOption.CREATE_NEW);

(添加异常处理)，然后将内容写入该outStream

您应该使用NIO进行文件访问，请参阅：Java: Path vs File