wisdomisite-java/src/main/java/com/zhgd/xmgl/util/ImageUtils.java

package com.zhgd.xmgl.util;

import cn.hutool.core.img.ImgUtil;
import cn.hutool.core.io.FileUtil;
import com.zhgd.xmgl.base.ImgTextBean;
import net.coobird.thumbnailator.Thumbnails;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.math.BigDecimal;

/**
 * @program: wisdomSite
 * @description: 图片处理
 * @author: Mr.Peng
 * @create: 2021-07-14 16:03
 **/

public class ImageUtils {

    /**
     *
     * @param bytes 原图片字节数组
     * @param desFileSize 指定图片大小,单位 kb
     * @param accuracy 精度,递归压缩的比率,建议小于0.9
     * @return
     */
   /* public static byte[] commpressPicCycle(byte[] bytes, long desFileSize, double accuracy) throws IOException {
        // 获取目标图片
//        File imgFile = new File(desPath);
//        long fileSize = imgFile.length();
        long fileSize = bytes.length;
        log.info("=====fileSize======== "+fileSize);
        // 判断图片大小是否小于指定图片大小
        if(fileSize <= desFileSize * 1024){
            return bytes;
        }
        //计算宽高
        BufferedImage bim = ImageIO.read(new ByteArrayInputStream(bytes));
        int imgWidth = bim.getWidth();
        log.info(imgWidth+"====imgWidth=====");
        int imgHeight = bim.getHeight();
        int desWidth = new BigDecimal(imgWidth).multiply( new BigDecimal(accuracy)).intValue();
        log.info(desWidth+"====desWidth=====");
        int desHeight = new BigDecimal(imgHeight).multiply( new BigDecimal(accuracy)).intValue();
        //字节输出流（写入到内存）
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Thumbnails.of(new ByteArrayInputStream(bytes)).size(desWidth, desHeight).outputQuality(accuracy).toOutputStream(baos);
        //如果不满足要求,递归直至满足要求
        return commpressPicCycle(baos.toByteArray(), desFileSize, accuracy);
    }*/
    public static byte[] commpressPicCycle(byte[] bytes, long desFileSize, double accuracy) throws IOException {
        // 获取目标图片
//        File imgFile = new File(desPath);
//        long fileSize = imgFile.length();
        long fileSize = bytes.length;
        //log.info("=====fileSize======== "+fileSize);
        // 判断图片大小是否小于指定图片大小
        if(fileSize <= desFileSize * 1024){
            return bytes;
        }
        //计算宽高
        BufferedImage bim = ImageIO.read(new ByteArrayInputStream(bytes));
        int imgWidth = bim.getWidth();
        //log.info(imgWidth+"====imgWidth=====");
        int imgHeight = bim.getHeight();
        int desWidth = new BigDecimal(imgWidth).multiply( new BigDecimal(accuracy)).intValue();
        //log.info(desWidth+"====desWidth=====");
        int desHeight = new BigDecimal(imgHeight).multiply( new BigDecimal(accuracy)).intValue();
        //字节输出流（写入到内存）
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Thumbnails.of(new ByteArrayInputStream(bytes)).size(desWidth, desHeight).outputQuality(accuracy).toOutputStream(baos);
        //如果不满足要求,递归直至满足要求
        return commpressPicCycle(baos.toByteArray(), desFileSize, accuracy);
    }

    public static byte[] File2byte(File tradeFile){
        byte[] buffer = null;
        try
        {
            FileInputStream fis = new FileInputStream(tradeFile);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] b = new byte[1024];
            int n;
            while ((n = fis.read(b)) != -1)
            {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            buffer = bos.toByteArray();
        }catch (FileNotFoundException e){
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
        return buffer;
    }



    /**
     * 添加水印
     * @param inputStream
     * @param list
     * @return
     */
    public static BufferedImage pressText(InputStream inputStream,java.util.List<ImgTextBean> list) {
        BufferedImage targetImage=null;
        try {
            targetImage= ImgUtil.read(inputStream);
            Graphics2D g = targetImage.createGraphics();
            if(list!=null&&list.size()>0){
                for(ImgTextBean imgTextBean:list){
                    if(null == imgTextBean.getFont()) {
                        // 默认字体
                        imgTextBean.setFont(new Font("Courier", Font.PLAIN, (int)(targetImage.getHeight() * 0.75)));
                    }
                    // 抗锯齿
                    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                    g.setColor(imgTextBean.getColor());
                    g.setFont(imgTextBean.getFont());
                    // 透明度
                    g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, imgTextBean.getAlpha()));
                    // 在指定坐标绘制水印文字
                    FontMetrics metrics = g.getFontMetrics(imgTextBean.getFont());
                    int textLength = metrics.stringWidth(imgTextBean.getPressText());
                    int textHeight = metrics.getAscent() - metrics.getLeading() - metrics.getDescent();
                    g.drawString(imgTextBean.getPressText(), Math.abs(targetImage.getWidth() - textLength) / 2 + imgTextBean.getX(), Math.abs(targetImage.getHeight() + textHeight) / 2 + imgTextBean.getY());
                }
            }
            g.dispose();
        }catch (Exception e){
            e.printStackTrace();
        }

        return targetImage;
    }

    public static void main(String[] args) {
        try {
            File file=new File("E:/11.jpg");
            byte[] by=commpressPicCycle(File2byte(file),45,0.5f);
            FileUtil.writeBytes(by,"E:/22.jpg");

        }catch (Exception e){
            e.printStackTrace();
        }

    }
}