ImageIO.read 和 ImageIO.write 操作同一图片引起图片大小失真的解决方案

/**
	 * 处理图片
	 * 
	 * @param fileBufferd  图片数据流
	 * @param tempFilePath 临时文件夹
	 * @return
	 */
	public void writeImage(BufferedImage fileBufferd, String tempFilePath) {
		File file = new File(tempFilePath + (new Date().getTime()) + ".jpg");
		//这么写是为了防止使用ImageIO.write后失真
		Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
		if (iter.hasNext()) {
			ImageWriter writer = iter.next();
			ImageWriteParam param = writer.getDefaultWriteParam();

			param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
			param.setCompressionQuality(0.92f);
			try {
				FileImageOutputStream out = new FileImageOutputStream(file);
				writer.setOutput(out);
				// writer.write(bi);
				writer.write(null, new IIOImage(fileBufferd, null, null), param);
				out.close();
				writer.dispose();
			} catch (Exception ex) {

				System.out.println("===异常了==");
			}
		}

	}

大小可设置。 经测试 0.92 与原图差不多。