**采用谷歌插件,亲测可用
pom依赖如下:
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
只上干货:拿去即可用! 把图片转成输入流对流进行压缩
(七八兆以十几兆的图片大小按照比例进行压缩,压缩后大小在100k~200k左右,并且图片无损)
public static InputStream compressImage(MultipartFile file) {
InputStream inputStream = null;
try {
inputStream = file.getInputStream();
BufferedImage image = ImageIO.read(file.getInputStream());
int width = image.getWidth();
int height = image.getHeight();
int newHeight = 0;
int newWidth = 0;
if (width > 1360) {
newWidth = 1360;
newHeight = height * 1360 / width;
//按指定大小把图片进行缩和放(会遵循原图高宽比例)
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ImageIO.write(image, “jpg”, outputStream);
byte[] bytes = outputStream.toByteArray();
ByteArrayOutputStream out = new ByteArrayOutputStream(bytes.length);
Thumbnails.of(inputStream).size(newWidth, newHeight).toOutputStream(out);//变为1360 * 对应比例,遵循原图比例缩放
byte[] b = out.toByteArray();
System.out.println("----------------压缩图片尺寸后大小-------------: " + b.length/1024+“K”);
inputStream = new ByteArrayInputStream(out.toByteArray());
}
} catch (IOException e) {
e.printStackTrace();
}
return inputStream;
}**