java通过Thumbnails压缩图片

一, 图片压缩处理

需求:

图片上传时太大, 要求压缩至xx kb以内再进行上传操作

/**
	 * 根据指定大小压缩图片
	 *
	 * @param imageBytes
	 *            源图片字节数组
	 * @param desFileSize
	 *            指定图片大小，单位kb
	 * @param imageId
	 *            影像编号
	 * @return 压缩质量后的图片字节数组
	 */
	public static byte[] compressPicForScale(byte[] imageBytes, long desFileSize, String imageId) {
		if (imageBytes == null || imageBytes.length <= 0 || imageBytes.length < desFileSize * 1024) {
			return imageBytes;
		}
		long srcSize = imageBytes.length;
		double accuracy = getAccuracy(srcSize / 1024);
		try {
			while (imageBytes.length > desFileSize * 1024) {
				ByteArrayInputStream inputStream = new ByteArrayInputStream(imageBytes);
				ByteArrayOutputStream outputStream = new ByteArrayOutputStream(imageBytes.length);
				Thumbnails.of(inputStream).scale(accuracy).outputQuality(accuracy).toOutputStream(outputStream);
				imageBytes = outputStream.toByteArray();
			}
			logger.info("【图片压缩】imageId={} | 图片原大小={}kb | 压缩后大小={}kb", imageId, srcSize / 1024,
					imageBytes.length / 1024);
		} catch (Exception e) {
			logger.error("【图片压缩】msg=图片压缩失败!", e);
		}
		return imageBytes;
	}

##  需要用到第三方jar包(thumbnailator-0.4.8.jar)

<dependency>
	<groupId>net.coobird</groupId>
	<artifactId>thumbnailator</artifactId>
	<version>0.4.8</version>
</dependency>