ImgUtil 图片处理工具类，文字提取，图片水印

咸来无事，整理了一些可能会用到的 图片处理工具，↓

<!-- https://mvnrepository.com/artifact/net.sourceforge.tess4j/tess4j 图像识别 -->
        <dependency>
            <groupId>net.sourceforge.tess4j</groupId>
            <artifactId>tess4j</artifactId>
            <version>4.5.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/net.coobird/thumbnailator -->
        <dependency>
            <groupId>net.coobird</groupId>
            <artifactId>thumbnailator</artifactId>
            <version>0.4.12</version>
        </dependency>

import lombok.extern.slf4j.Slf4j;
import net.coobird.thumbnailator.Thumbnails;
import net.sourceforge.tess4j.ITesseract;
import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;
import org.springframework.util.ResourceUtils;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/** * @description: 图片处理工具类 * @author: hexiaoshu **/
@Slf4j
public class ImgUtil {
    


    /** * 图片内容提取，数字以前单次读取较准确，中文需要训练 * @param imgPath 图片路径 * @param languagePath 语言库路径 * @param language 语言,默认英文 chi_sim 中文, eng 英文 * @param rectangle 坐标范围，可选 * @return Content */
    public static String readImg(String imgPath,String languagePath,String language,Rectangle rectangle){
    
        File file = new File(imgPath);
        if (!file.exists()){
    
            return "图片路径不存在";
        }
        ITesseract instance = new Tesseract();
        instance.setDatapath(languagePath);
        if (language==null || language.isEmpty()){
    
            instance.setLanguage("eng");
        }
        String result = "";
        try {
    
            if (rectangle==null){
    
                result =  instance.doOCR(file);
            }else {
    
                result =  instance.doOCR(file ,rectangle);
            }
        } catch (TesseractException e) {
    
            e.printStackTrace();
        }
        return result;
    }


    /** 设置文字水印 * @param sourceImg 源图片路径 * @param targetImg 保存的图片路径 * @param watermark 水印内容 * @param color 水印颜色 new Color(255,255,255,128) * @param font 水印字体 new Font("04b_08", Font.PLAIN, 30) * @throws IOException */
    public static boolean addWatermark(String sourceImg, String targetImg, String watermark,Color color,Font font){
    
        File srcImgFile = new File(sourceImg);
        Image srcImg;
        try {
    
            srcImg=ImageIO.read(srcImgFile);
        }catch (IOException e){
    
            return false;
        }
        int srcImgWidth = srcImg.getWidth(null);
        int srcImgHeight = srcImg.getHeight(null);
        BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bufImg.createGraphics();
        g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
        g.setColor(color);
        g.setFont(font);
        //设置水印的坐标
        int x = srcImgWidth - (g.getFontMetrics(g.getFont()).charsWidth(watermark.toCharArray(), 0, watermark.length())+20);
        int y = srcImgHeight - 25;
        //加水印
        g.drawString(watermark, x, y);
        g.dispose();
        // 输出图片
        FileOutputStream outImgStream;
        try {
    
            outImgStream = new FileOutputStream(targetImg);
            ImageIO.write(bufImg, "jpg", outImgStream);
            outImgStream.flush();
            outImgStream.close();
        }catch (IOException e){
    
            return false;
        }
        return true;
    }

    /** * 获取跟目录---与jar包同级目录的upload目录下指定的子目录subdirectory * @param subdirectory 子目录 * @return */
    public static String  getJarPath(String subdirectory){
    
        File upload;
        try {
    
            //本地测试时获取到的是"工程目录/target/upload/subdirectory
            File path = new File(ResourceUtils.getURL("classpath:").getPath());
            if(!path.exists()) {
    
                path = new File("");
            }
            upload = new File(path.getAbsolutePath(),subdirectory);
            if(!upload.exists()) {
    
                upload.mkdirs();
            }
            return upload + File.separator;
        } catch (FileNotFoundException e) {
    
            throw new RuntimeException("获取服务器路径发生错误！");
        }
    }

    /** * 为图片添加图片水印 * @param watermarkUrl 水印图片 * @param source 原图 * @param output 制作完成的图片 * @return boolean */
    public static boolean markImgMark(String watermarkUrl, String source, String output){
    
        File file = new File(source);
        Image img;
        try {
    
            img = ImageIO.read(file);
        }catch (IOException e){
    
            e.printStackTrace();
            return false;
        }
        String thumbnailName = "";
        String thumbnailPath = "";
        String path = getJarPath("thumbnail_img");
        int width = img.getWidth(null);
        int height = img.getHeight(null);
        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g.drawImage(img.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
        ImageIcon imgIcon = new ImageIcon(watermarkUrl);
        int waterHeight = imgIcon.getImage().getHeight(null);
        int waterWidth = imgIcon.getImage().getWidth(null);
        if ( (waterHeight+waterWidth) > 400){
    
            log.info("调整水印图片");
            thumbnailName ="Thumbnail.png";
            thumbnailPath=path+File.separator+thumbnailName;
            ImgUtil.creatThumbnail(watermarkUrl, thumbnailPath,100,100);
            imgIcon = new ImageIcon(thumbnailPath);
        }
        Image con = imgIcon.getImage();
        float clarity = 0.6f;
        g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, clarity));
        g.drawImage(con, 10, 10, null);
        g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
        g.dispose();
        File sf = new File(output);
        try {
    
            ImageIO.write(bi, "jpg", sf);
        }catch (IOException e){
    
            e.printStackTrace();
            return false;
        }
        if (!thumbnailName.isEmpty()){
    
            File file1 = new File(thumbnailPath);
            file1.delete();
        }
        return true;
    }


    /** * 生成缩略图 * @param sourceImg 原图片 * @param outImg 生成图片 * @param width and height 图片宽高 * @return boolean */
    public static boolean creatThumbnail(String sourceImg,String outImg,int width,int height){
    
        File originalImg = new File(sourceImg);
        File thumbnailImg = new File(outImg);
        Thumbnails.Builder<File> builder = Thumbnails.of(originalImg).size(width, height).outputQuality(0.5f);
        try {
    
            builder.toFile(thumbnailImg);
        }catch (IOException e){
    
            e.printStackTrace();
            return false;
        }
        return true;
    }


}

tess4j 语言库 中文-英文.rar ，中文需要自个调整。
我觉得读取什么，身份证号码，驾驶证什么的，完全没有问题，而且还可以根据图片像素坐标提取, 问题不大。
链接：https://pan.baidu.com/s/1uSDw_dBpy9jmSpAcqkBYsA
提取码：fkq8

下次再添加。