怎么把Image对象写入文件


                    InputStream in = new FileInputStream(logo);
                    long imageLength = in.available();
                    if (1048576 <= imageLength) {
                        request.setAttribute("error", "公司图标");
                        return mapping.getInputForward();
                    }                    in.close();                    String fileExt = getFormat(logo);获得文件的后缀名
                    if (null == fileExt) {
                        request.setAttribute("imageError", "");
                        return mapping.getInputForward();
                    }                    File _file = new File(logo); //读入文件 logo是文件的路径
                    Image src = javax.imageio.ImageIO.read(_file); //构造Image对象
                    int width = src.getWidth(null); //得到源图宽
                    int height = src.getHeight(null); //得到源图长
                    log.debug("$$$$$$$$$$$$$$$" + new Integer(width));
                    log.debug("$$$$$$$$$$$$$$$" + new Integer(height));
                    ImageFilter filter = null;
                    Graphics g = null;    
                    BufferedImage tag= null;
                
                    if (500 < width && 375 < height) {
                    filter = new ReplicateScaleFilter(500, 375);
//                         tag = new BufferedImage(500, 375, BufferedImage.TYPE_INT_RGB);
//                        tag.getGraphics().drawImage(src, 0, 0, 500, 375, null); //绘制缩小后的图                    }
                FilteredImageSource source = new FilteredImageSource(src.getSource(), filter);
                Image newImage = Toolkit.getDefaultToolkit().createImage(source);
                    String strAbsPath = request.getSession().getServletContext().getRealPath(request.getRequestURI());//获得绝对路径
                    File file = new File(strAbsPath);
                    strAbsPath = file.getParentFile().getParent() + File.separator + "temp" + File.separator;
                    //OutputStream out = new FileOutputStream(strAbsPath + "temp." + fileExt);    //生成零时路径
                    File files = new File(strAbsPath);
                    javax.imageio.ImageIO.write(newImage, fileExt, files);
                    log.debug("&&&&&&&&&&&&&&" + strAbsPath);                    InputStream in2 = new FileInputStream(strAbsPath + "temp." + fileExt);
                    byte[] b = new byte[in2.available()];                    in2.read(b);
                    in2.close();
                    ep.setLogo(b);
                    ep.setLogoFormat(fileExt);怎么把生成的Image对象写入零时路径