Java 图片压缩

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
 
import javax.swing.ImageIcon;
 
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
 
//java项目www.fhadmin.org
public class imagesFiler {
	/**
     * 缩放图片(压缩图片质量，改变图片尺寸)
     * 若原图宽度小于新宽度，则宽度不变！
     * @param originalFile 原图片路径地址
     * @param resizedFile 压缩后输出路径地址
     * @param maxWidth 最大宽度
     * @param maxHeight 最大高度
     * @param newWidth 新的宽度
     * @param quality 图片质量参数 0.7f 相当于70%质量
     */
    public static void imageResize(File originalFile, File resizedFile,
                              int maxWidth,int maxHeight, float quality) throws IOException {
 
        if (quality > 1) {
            throw new IllegalArgumentException(
                    "图片质量需设置在0.1-1范围");
        }
 
        ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
        Image i = ii.getImage();
        Image resizedImage = null;
 
        int iWidth = i.getWidth(null);
        int iHeight = i.getHeight(null);
 
        int newWidth = maxWidth;
        if(iWidth < maxWidth){
            newWidth = iWidth;
        }
 
 
        if (iWidth >= iHeight) {
            resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)
                    / iWidth, Image.SCALE_SMOOTH);
        }
  
 
        int newHeight = maxHeight;
        if(iHeight < maxHeight){
            newHeight = iHeight;
        }
 
        if(resizedImage==null && iHeight >= iWidth){
            resizedImage = i.getScaledInstance((newHeight * iWidth) / iHeight,
                    newHeight, Image.SCALE_SMOOTH);
        }
 
        //此代码确保加载图像中的所有像素
        Image temp = new ImageIcon(resizedImage).getImage();
 
        //创建缓冲图像
        BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null),
                temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
 
        //将图像复制到缓冲图像
        Graphics g = bufferedImage.createGraphics();
 
       //清除背景并绘制图像。
        g.setColor(Color.white);
        g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
        g.drawImage(temp, 0, 0, null);
        g.dispose();
 
        float softenFactor = 0.05f;
        float[] softenArray = { 0, softenFactor, 0, softenFactor,
                1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0 };
        Kernel kernel = new Kernel(3, 3, softenArray);
        ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
        bufferedImage = cOp.filter(bufferedImage, null);
 
        //将jpeg写入文件 
        FileOutputStream out = new FileOutputStream(resizedFile);
 
         //将图像编码为jpeg数据流
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
 
        JPEGEncodeParam param = encoder
                .getDefaultJPEGEncodeParam(bufferedImage);
 
        param.setQuality(quality, true);
 
        encoder.setJPEGEncodeParam(param);
        encoder.encode(bufferedImage);
    } 
   
}

//java项目www.fhadmin.org
public class demo {
	public static void main(String[] args) throws Exception{
	//需要压缩的图片地址     aaa.jpg为需要压缩的图片
	File customaryFile = new File("");
	//压缩过后输出的路径地址    ddd.jpg 可进行设置为任意名称
	File compressAfter = new File("");
        imagesFiler.imageResize(customaryFile,compressAfter,1200,2500,0.8f);
	}
}

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

implementation group: 'net.coobird', name: 'thumbnailator', version: '0.4.14'

Thumbnails.of("原图文件的路径") 
        .scale(1f) 
        .outputQuality(0.5f) 
        .toFile("压缩后文件的路径");