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@@ -0,0 +1,81 @@
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+package com.community.huiju.common;
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+
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+import net.coobird.thumbnailator.Thumbnails;
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+import org.slf4j.Logger;
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+import org.slf4j.LoggerFactory;
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+
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+import java.io.ByteArrayInputStream;
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+import java.io.ByteArrayOutputStream;
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+
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+/**
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+ * 图片压缩Utils
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+ *
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+ * @author worstEzreal
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+ * @version V1.1.0
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+ * @date 2018/3/12
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+ */
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+public class PicUtils {
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+
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+ private static Logger logger = LoggerFactory.getLogger(PicUtils.class);
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+
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+ /*public static void main(String[] args) throws IOException {
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+ byte[] bytes = FileUtils.readFileToByteArray(new File("C:\\Users\\DELL\\Pictures\\timg.jpg"));
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+ long l = System.currentTimeMillis();
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+ bytes = PicUtils.compressPicForScale(bytes, 20, "x");// 图片小于300kb
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+ System.out.println(System.currentTimeMillis() - l);
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+ FileUtils.writeByteArrayToFile(new File("C:\\Users\\DELL\\Pictures\\timg.jpg"), bytes);
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+ }*/
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+
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+ /**
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+ * 根据指定大小压缩图片
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+ *
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+ * @param imageBytes 源图片字节数组
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+ * @param desFileSize 指定图片大小，单位kb
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+ * @param imageId 影像编号
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+ * @return 压缩质量后的图片字节数组
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+ */
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+ public static byte[] compressPicForScale(byte[] imageBytes, long desFileSize, String imageId) {
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+ if (imageBytes == null || imageBytes.length <= 0 || imageBytes.length < desFileSize * 1024) {
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+ return imageBytes;
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+ }
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+ long srcSize = imageBytes.length;
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+ double accuracy = getAccuracy(srcSize / 1024);
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+ try {
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+ while (imageBytes.length > desFileSize * 1024) {
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+ ByteArrayInputStream inputStream = new ByteArrayInputStream(imageBytes);
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+ ByteArrayOutputStream outputStream = new ByteArrayOutputStream(imageBytes.length);
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+ Thumbnails.of(inputStream)
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+ .scale(accuracy)
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+ .outputQuality(accuracy)
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+ .toOutputStream(outputStream);
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+ imageBytes = outputStream.toByteArray();
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+ }
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+ logger.info("【图片压缩】imageId={} | 图片原大小={}kb | 压缩后大小={}kb",
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+ imageId, srcSize / 1024, imageBytes.length / 1024);
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+ } catch (Exception e) {
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+ logger.error("【图片压缩】msg=图片压缩失败!", e);
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+ }
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+ return imageBytes;
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+ }
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+
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+ /**
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+ * 自动调节精度(经验数值)
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+ *
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+ * @param size 源图片大小
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+ * @return 图片压缩质量比
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+ */
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+ private static double getAccuracy(long size) {
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+ double accuracy;
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+ if (size < 900) {
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+ accuracy = 0.85;
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+ } else if (size < 2047) {
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+ accuracy = 0.6;
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+ } else if (size < 3275) {
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+ accuracy = 0.44;
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+ } else {
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+ accuracy = 0.4;
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+ }
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+ return accuracy;
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+ }
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+
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+}
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