108 lines
3.9 KiB
Plaintext
108 lines
3.9 KiB
Plaintext
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package com.sercurityControl.proteam.util;
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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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import java.io.*;
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public class PicUtils {
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//以下是常量,按照阿里代码开发规范,不允许代码中出现魔法值
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private static final Logger logger = LoggerFactory.getLogger(PicUtils.class);
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private static final Integer ZERO = 0;
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private static final Integer ONE_ZERO_TWO_FOUR = 1024;
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private static final Integer NINE_ZERO_ZERO = 900;
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private static final Integer THREE_TWO_SEVEN_FIVE = 3275;
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private static final Integer TWO_ZERO_FOUR_SEVEN = 2047;
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private static final Double ZERO_EIGHT_FIVE = 0.85;
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private static final Double ZERO_SIX = 0.6;
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private static final Double ZERO_FOUR_FOUR = 0.44;
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private static final Double ZERO_FOUR = 0.4;
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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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* @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) {
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if (imageBytes == null || imageBytes.length <= ZERO || imageBytes.length < desFileSize * ONE_ZERO_TWO_FOUR) {
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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 / ONE_ZERO_TWO_FOUR);
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try {
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while (imageBytes.length > desFileSize * ONE_ZERO_TWO_FOUR) {
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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("图片原大小={}kb | 压缩后大小={}kb",
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srcSize / ONE_ZERO_TWO_FOUR, imageBytes.length / ONE_ZERO_TWO_FOUR);
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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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* 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 < NINE_ZERO_ZERO) {
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accuracy = ZERO_EIGHT_FIVE;
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} else if (size < TWO_ZERO_FOUR_SEVEN) {
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accuracy = ZERO_SIX;
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} else if (size < THREE_TWO_SEVEN_FIVE) {
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accuracy = ZERO_FOUR_FOUR;
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} else {
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accuracy = ZERO_FOUR;
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}
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return accuracy;
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}
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public static byte[] FileTobyte(File file) {
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FileInputStream fileInputStream = null;
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byte[] imgData = null;
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try {
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imgData = new byte[(int) file.length()];
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//read file into bytes[]
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fileInputStream = new FileInputStream(file);
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fileInputStream.read(imgData);
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} catch (IOException e) {
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e.printStackTrace();
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} finally {
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if (fileInputStream != null) {
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try {
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fileInputStream.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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return imgData;
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}
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public static void main(String[] args) throws IOException {
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byte[] bytes = compressPicForScale(FileTobyte(new File("L:\\测试图片\\6.jpg")), 120);
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String newFileName = IDUtils.createID() + ".jpg";
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File fOut = new File("L:\\测试图片\\" + newFileName);
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FileOutputStream fileOutputStream = new FileOutputStream(fOut);
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fileOutputStream.write(bytes);
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fileOutputStream.close();
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}
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}
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