等比例压缩图片上传到FTP。有时候会变成黑白图片，是怎么回事？

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上传到FTP

public void uploadFtpServer(String filePath, String fileName, String ftpPath) {

        logger.info(
                "uploadFtpServer(String filePath, String fileName, String ftpPath={})	--start",
                filePath, fileName, ftpPath);

        FTPClient client = new FTPClient();

        int reply = 0;

        try {
            client.setControlEncoding("GBK");
            FTPClientConfig conf = new FTPClientConfig(
                    FTPClientConfig.SYST_UNIX);
            conf.setServerLanguageCode("zh");
            client.connect(url, port);
            client.login(username, password);

            reply = client.getReplyCode();

            if (!FTPReply.isPositiveCompletion(reply)) {
                client.disconnect();
            } else {

                if (!client.changeWorkingDirectory(ftpPath)) {
                    client.makeDirectory(ftpPath);
                    client.changeWorkingDirectory(ftpPath);
                }

                client.enterLocalPassiveMode();
                client.setFileType(FTPClient.BINARY_FILE_TYPE);
                client.setBufferSize(1024 * 1024 * 10);
                //client.changeWorkingDirectory(filePath);
                //InputStream input = new FileInputStream(new File(filePath));
                BufferedInputStream input = new BufferedInputStream(new FileInputStream(new File(filePath)));
                //  InputStreamReader  input = new InputStreamReader(new FileInputStream(new File(filePath)));
                client.storeFile(fileName, input);

                input.close();
                client.logout();
            }
        } catch (Exception e) {
            throw new BaseException(ExceptionCategory.Illegal_Parameter,
                    "将上传到服务器中的文件读取出来存入ftp文件服务器时出现错误！" + e.getMessage());
        } finally {
            if (client.isConnected()) {
                try {
                    client.disconnect();
                } catch (IOException ioe) {
                }
            }
            logger.info(
                    "uploadFtpServer(String filePath, String fileName, String ftpPath={})	--end",
                    filePath, fileName, ftpPath);
        }
    }

等比例压缩：

public String zipImageFile(File oldFile, File newFile, float rate) {
        if (oldFile == null) {
            return null;
        }
        try {
            /** 对服务器上的临时文件进行处理 */
            Image srcFile = ImageIO.read(oldFile);
            int w = srcFile.getWidth(null);
            int h = srcFile.getHeight(null);

            int height = (int) (h * rate);
            int width = (int) (w * rate);

            String srcImgPath = newFile.getAbsoluteFile().toString();
            String subfix = "jpg";
            subfix = srcImgPath.substring(srcImgPath.lastIndexOf(".") + 1,
                    srcImgPath.length());

            BufferedImage buffImg = null;
            if (subfix.equals("png")) {
                buffImg = new BufferedImage(width, height,
                        BufferedImage.TYPE_INT_ARGB);
            } else {
                buffImg = new BufferedImage(width, height,
                        BufferedImage.TYPE_INT_RGB);
            }

            Graphics2D graphics = buffImg.createGraphics();
            graphics.setBackground(new Color(255, 255, 255));
            graphics.setColor(new Color(255, 255, 255));
            graphics.fillRect(0, 0, width, height);
            graphics.drawImage(srcFile.getScaledInstance(width, height,
                    Image.SCALE_SMOOTH), 0, 0, null);

            ImageIO.write(buffImg, subfix, new File(srcImgPath));

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return newFile.getAbsolutePath();
    }

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而且是不定时出现的。