图片压缩
作者：互联网
依赖导入
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
工具类
package com.yixin.ms.boot.uitls;
import lombok.extern.slf4j.Slf4j;
import net.coobird.thumbnailator.Thumbnails;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
/**
* @description: 图片压制至小于指定大小
* @ClassName ThumbnailsUtil
* @Author WXG
* @Date 2021/10/20 15:28
*/
@Slf4j
public class ThumbnailsUtil {
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;
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;
}
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;
}
}
调用
byte[] bytes = null;
String img=null;
//图片压缩
try {
bytes = FileUtils.readFileToByteArray(new File(passportUrl));//passportUrl 为图片的路径
bytes = ThumbnailsUtil.compressPicForScale(bytes, 300);// 图片小于300kb 返回的是压缩之后图片的字节数组
img = Base64.encodeBase64String(bytes);//将字节数组转为 base64的图片 字符串格式
} catch (IOException e) {
e.printStackTrace();
}
标签：压缩,private,FOUR,ZERO,static,imageBytes,final,图片 来源： https://www.cnblogs.com/wxgShareBlog/p/15429408.html