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<!-- thumbnailator图片压缩需要依赖 -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>

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import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import javax.imageio.ImageIO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.coobird.thumbnailator.Thumbnails;
public class ImageUtil {
private final static Logger logger = LoggerFactory.getLogger(ImageUtil.class);
private final static int WAIT_NUM = 30;
/**
* 方式1
* 指定图片宽度和高度和压缩比例对图片进行压缩
*
* @param imgsrc
源图片地址
* @param imgdist 目标图片地址
*/
public static String reduceImg(String imgsrc, String imgdist) {
logger.info("图片压缩开始");
FileOutputStream out = null;
try {
File srcfile = new File(imgsrc);
// 检查图片文件是否存在
if (!srcfile.exists()) {
logger.info("文件不存在");
return null;
}
int[] results = getImgWidthHeight(srcfile);
int widthdist = results[0];
int heightdist = results[1];
// 开始读取文件并进行压缩
Image src = ImageIO.read(srcfile);
// 构造一个类型为预定义图像类型之一的 BufferedImage
BufferedImage tag = new BufferedImage(widthdist, heightdist, BufferedImage.TYPE_INT_RGB);
// 这边是压缩的模式设置
tag.getGraphics().drawImage(src.getScaledInstance(widthdist, heightdist, Image.SCALE_SMOOTH), 0, 0, null);
//创建文件输出流
out = new FileOutputStream(imgdist);
//将图片按JPEG压缩，保存到out中
String formatName = imgdist.substring(imgdist.lastIndexOf(".") + 1);
ImageIO.write(tag, formatName, out);
out.flush();
} catch (Exception ef) {
ef.printStackTrace();
} finally {
try {
if (out != null) {
//关闭文件输出流
out.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
logger.info("图片压缩结束");
return imgdist;
}
/**
* 获取图片宽度和高度
*
* @param file 图片路径
* @return 返回图片的宽度
*/
public static int[] getImgWidthHeight(File file) {
InputStream is = null;
BufferedImage src = null;
int result[] = {0, 0};
try {
// 获得文件输入流
is = new FileInputStream(file);
// 从流里将图片写入缓冲图片区
src = ImageIO.read(is);
// 得到源图片宽
result[0] = src.getWidth(null);
// 得到源图片高
result[1] = src.getHeight(null);
} catch (Exception ef) {
ef.printStackTrace();
} finally {
try {
if (is != null) {
is.close();
//关闭输入流
}
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
/**
* 方式2
* @param imgsrc
源目标文件
* @param imgdist 生成目标文件
* @return
*/
public static String thumbnailatorReduceImg(String imgsrc, String imgdist) {
try {
int countFlag = 1;
logger.info("图片压缩开始");
Thumbnails.of(imgsrc).scale(1).outputQuality(0.6).toFile(imgdist);
// 循环等待
while (countFlag < WAIT_NUM) {
try {
countFlag++;
Thread.sleep(150);
File file = new File(imgdist);
if (file.exists()) {
break;
}
} catch (Exception e) {
e.printStackTrace();
}
}
logger.info("图片压缩结束");
} catch (Exception e) {
e.printStackTrace();
}
return imgdist;
}
public static void main(String[] args) {
String scrPath = "C:\Users\dell\Desktop\model\test\9d6d5d0d-f179-43ce-a3a5-bc58db650918.png";
String toPath = "C:\Users\dell\Desktop\model\test\copy.jpg";
File srcfile = new File(scrPath);
File distfile = new File(toPath);
System.out.println("压缩前图片大小：" + srcfile.length());
//reduceImg(scrPath, toPath);
thumbnailatorReduceImg(scrPath, toPath);
System.out.println("压缩后图片大小：" + distfile.length());
}
}