package com.hxzkmonitor.util;
|
|
import javax.imageio.ImageIO;
|
import java.awt.*;
|
import java.awt.image.BufferedImage;
|
import java.io.ByteArrayInputStream;
|
import java.io.ByteArrayOutputStream;
|
import java.io.IOException;
|
import java.util.Arrays;
|
|
public class imagesFiler {
|
|
/**
|
* 将图片压缩到指定大小以内
|
*
|
* @param srcImgData 源图片数据
|
* @param maxSize 目的图片大小
|
* @return 压缩后的图片数据
|
*/
|
public static byte[] compressUnderSize(byte[] srcImgData, long maxSize) {
|
double scale = 0.15f;
|
byte[] imgData = Arrays.copyOf(srcImgData, srcImgData.length);
|
|
if (imgData.length > maxSize) {
|
do {
|
try {
|
imgData = compress(imgData, scale);
|
|
} catch (IOException e) {
|
throw new IllegalStateException("压缩图片过程中出错，请及时联系管理员！", e);
|
}
|
|
} while (imgData.length > maxSize);
|
}
|
|
return imgData;
|
}
|
|
/**
|
* 按照 宽高 比例压缩
|
*
|
* @param imgIs 待压缩图片输入流
|
* @param scale 压缩刻度
|
* @param out 输出
|
* @return 压缩后图片数据
|
* @throws IOException 压缩图片过程中出错
|
*/
|
public static byte[] compress(byte[] srcImgData, double scale) throws IOException {
|
BufferedImage bi = ImageIO.read(new ByteArrayInputStream(srcImgData));
|
int width = (int) (bi.getWidth() * scale); // 源图宽度
|
int height = (int) (bi.getHeight() * scale); // 源图高度
|
|
Image image = bi.getScaledInstance(width, height, Image.SCALE_SMOOTH);
|
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
|
|
Graphics g = tag.getGraphics();
|
g.setColor(Color.RED);
|
g.drawImage(image, 0, 0, null); // 绘制处理后的图
|
g.dispose();
|
|
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
|
ImageIO.write(tag, "JPEG", bOut);
|
|
return bOut.toByteArray();
|
}
|
}
|
