java图片压缩

在开发的过程中，很多时候对图片的处理都需要做压缩，在这里给大家分享简单快速的实现方式

1.pom引入

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

2.编写工具类调用即可

@Slf4j
public class ImgCompressUtil {
private static final Integer ZERO = 0;
private static final Integer ONE_ZERO_TWO_FOUR = 1024;
private static final Integer NINE_ZERO_ZERO = 900;
private static final Integer THREE_TWO_SEVEN_FIVE = 3275;
private static final Integer TWO_ZERO_FOUR_SEVEN = 2047;
private static final Double ZERO_EIGHT_FIVE = 0.85;
private static final Double ZERO_SIX = 0.6;
private static final Double ZERO_FOUR_FOUR = 0.44;
private static final Double ZERO_FOUR = 0.4;
private static final String JPG = ".jpg";
/**
* 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
* @return 压缩质量后的图片字节数组
*/
public static byte[] compressPicForScale(byte[] imageBytes, long desFileSize) {
if (imageBytes == null || imageBytes.length <= ZERO || imageBytes.length < desFileSize * ONE_ZERO_TWO_FOUR) {
return imageBytes;
}
long srcSize = imageBytes.length;
double accuracy = getAccuracy(srcSize / ONE_ZERO_TWO_FOUR);
try {
while (imageBytes.length > desFileSize * ONE_ZERO_TWO_FOUR) {
ByteArrayInputStream inputStream = new ByteArrayInputStream(imageBytes);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream(imageBytes.length);
Thumbnails.of(inputStream)
.scale(accuracy)
.outputQuality(accuracy)
.toOutputStream(outputStream);
imageBytes = outputStream.toByteArray();
}
log.info("图片原大小={}kb | 压缩后大小={}kb",
srcSize / ONE_ZERO_TWO_FOUR, imageBytes.length / ONE_ZERO_TWO_FOUR);
} catch (Exception e) {
log.error("【图片压缩】msg=图片压缩失败!", e);
}
return imageBytes;
}
/**
* 自动调节精度(经验数值)
*
* @param size 源图片大小
* @return 图片压缩质量比
*/
private static double getAccuracy(long size) {
double accuracy;
if (size < NINE_ZERO_ZERO) {
accuracy = ZERO_EIGHT_FIVE;
} else if (size < TWO_ZERO_FOUR_SEVEN) {
accuracy = ZERO_SIX;
} else if (size < THREE_TWO_SEVEN_FIVE) {
accuracy = ZERO_FOUR_FOUR;
} else {
accuracy = ZERO_FOUR;
}
return accuracy;
}

最后

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