【转】Java工具类 - 实现图片不规则(多边形)裁剪、绘图、添加水印

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.TexturePaint;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;  
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.imageio.ImageIO;  
import javax.imageio.ImageReadParam;  
import javax.imageio.ImageReader;  
import javax.imageio.stream.ImageInputStream;
import javax.swing.ImageIcon;

public class ImageUtils {  
    /**
     * 矩形裁剪jpg
     * @param inputFilePath 图片输入路径
     * @param outFilePath 图片输出路径
     * @param x 原点x坐标
     * @param y 原点y坐标
     * @param width 宽
     * @param height 高
     * @throws IOException
     */
    public static void cut_JPG(String inputFilePath, String outFilePath, int x,
            int y, int width, int height) throws IOException {
        ImageInputStream imageStream = null;
        try {
            FileInputStream input = new FileInputStream(inputFilePath);
            Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("jpg");
            ImageReader reader = readers.next();
            imageStream = ImageIO.createImageInputStream(input);
            reader.setInput(imageStream, true);
            ImageReadParam param = reader.getDefaultReadParam();
            
            Rectangle rect = new Rectangle(x, y, width, height);
            param.setSourceRegion(rect);
            BufferedImage bi = reader.read(0, param);
            
            FileOutputStream out = new FileOutputStream(outFilePath);//输出图片的地址
            ImageIO.write(bi, "jpg", out);
            
            input.close();
            out.close();
        } finally {
            imageStream.close();
        }
    }
      
    /**
     * 矩形裁剪png
     * @param inputFilePath 图片输入路径
     * @param outFilePath 图片输出路径
     * @param x 原点x坐标
     * @param y 原点y坐标
     * @param width 宽
     * @param height 高
     * @throws IOException
     */
    public static void cut_PNG(String inputFilePath, String outFilePath, int x,
            int y, int width, int height) throws IOException {
        ImageInputStream imageStream = null;
        try {
            FileInputStream input = new FileInputStream(inputFilePath);
            Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("png");
            ImageReader reader = readers.next();
            imageStream = ImageIO.createImageInputStream(input);
            reader.setInput(imageStream, true);
            ImageReadParam param = reader.getDefaultReadParam();
            
            Rectangle rect = new Rectangle(x, y, width, height);
            param.setSourceRegion(rect);
            BufferedImage bi = reader.read(0, param);
            
            FileOutputStream out = new FileOutputStream(outFilePath);//输出图片的地址
            ImageIO.write(bi, "png", out);
            input.close();
            out.close();
        } finally {
            imageStream.close();
        }
    }
     /**
      * 矩形裁剪
      * @param inputFilePath 图片输入路径
      * @param outFilePath 图片输出路径
      * @param type 图片类型
      * @param x 原点x坐标
      * @param y 原点y坐标
      * @param width 宽
      * @param height 高
      * @throws IOException
      */
    public static void cut_Image(String inputFilePath, String outFilePath, String type,int x,
            int y, int width, int height) throws IOException {
        ImageInputStream imageStream = null;
        try {
            FileInputStream input = new FileInputStream(inputFilePath);
            String imageType=(null==type||"".equals(type))?"jpg":type;
            Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName(imageType);
            ImageReader reader = readers.next();
            imageStream = ImageIO.createImageInputStream(input);
            reader.setInput(imageStream, true);
            ImageReadParam param = reader.getDefaultReadParam();
            Rectangle rect = new Rectangle(x, y, width, height);
            param.setSourceRegion(rect);
            BufferedImage bi = reader.read(0, param);
            
            FileOutputStream out = new FileOutputStream(outFilePath);//输出图片的地址
            ImageIO.write(bi, imageType, out);
            input.close();
            out.close();
        } finally {
            imageStream.close();
        }
    }
    /**
     * 图片矩形裁切
     * @param inputFilePath 图片输入路径
     * @param outFilePath 图片输出路径
     * @param x 原点x坐标
     * @param y 原点y坐标
     * @param width 宽
     * @param height 高
     */
    public static void cut_Image2(String inputFilePath,String outFilePath,int x, int y, int width, int height) {
        try {
            File f = new File(inputFilePath);
            File t = new File(outFilePath);
            if (t.exists()) {
                t.delete();
            }
            //图片输入流
            ImageInputStream input = ImageIO.createImageInputStream(f);
            //图片读取器
            Iterator<ImageReader> it = ImageIO.getImageReaders(input);
            if (it.hasNext()) {
                ImageReader r = it.next();
                //设置输入流
                r.setInput(input, true);
                //读取参数
                ImageReadParam param = r.getDefaultReadParam();
                //创建要截取的矩形范围
                Rectangle rect = new Rectangle(x, y, width, height);
                //设置截取范围参数
                param.setSourceRegion(rect);
                //读取截图数据
                BufferedImage bi = r.read(0, param);
                // 保存图片
                ImageIO.write(bi, "jpg", t);
            }
            input.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }
    
    /**
     * 裁剪(多边形)
     * @param inputFilePath 图片输入路径
     * @param outFilePath 图片输出路径
     * @param x[] x轴坐标点数组
     * @param y[] y轴坐标点数组
     * @param n 坐标点数量
     * @throws IOException
     */
    public static void cutPolygon_Image( String inputFilePath,String outFilePath,int x[],  
            int y[],int n) throws IOException {
        try {
            BufferedImage image = ImageIO.read(new File(inputFilePath));
            GeneralPath clip = new GeneralPath(GeneralPath.WIND_EVEN_ODD, n);
            //int x[]={860,650,300,1700};
            //int y[]={20,20,1000,1000};
            clip.moveTo(x[0], y[0]);
            for (int i = 1; i < x.length; i++) {
                clip.lineTo(x[i], y[i]);
            }
            clip.closePath();
            
            Rectangle bounds = clip.getBounds();
            //BufferedImage img = new BufferedImage(bounds.width, bounds.height, BufferedImage.TYPE_INT_BGR);
            BufferedImage img = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_BGR);
            Graphics2D g2d = img.createGraphics();
            //clip.transform(AffineTransform.getTranslateInstance(0, 0));
            g2d.setClip(clip);
            //g2d.translate(0, 0);
            g2d.drawImage(image, 0, 0, null);
            g2d.dispose();

            FileOutputStream out = new FileOutputStream(outFilePath);//输出图片的地址
            ImageIO.write(img, "jpg", out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 绘图(图片上添加文字)
     * @param inputFilePath 图片输入路径
     * @param outFilePath 图片输出路径
     * @param list 文字内容及坐标
     * @throws IOException
     */
    public static void drawingText_Image( String inputFilePath,String outFilePath,List<Map<String,Object>> list) throws IOException {
        try {
            /*List<Map<String, Object>> listMap = new ArrayList<Map<String,Object>>();
            Map<String, Object> map = null;
            
            map = new HashMap<String , Object>();
            map.put("text","文字内容");
            map.put("x", 100);
            map.put("y", 100);
            listMap.add(map);*/
            
            BufferedImage image = ImageIO.read(new File(inputFilePath));
            Graphics2D g =(Graphics2D) image.getGraphics();
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.setColor(Color.YELLOW); //字体颜色
            g.setFont(new Font("微软雅黑", Font.BOLD, 32)); //字体样式
            for (Map<String, Object> map : list) {
                g.drawString((String) map.get("text"), (int)map.get("x"),(int)map.get("y"));
            }
            g.dispose();
            FileOutputStream out = new FileOutputStream(outFilePath);//输出图片的地址
            ImageIO.write(image, "jpg", out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 绘图(画矩形框)
     * @param inputFilePath 图片输入路径
     * @param outFilePath 图片输出路径
     * @param x 原点x坐标
     * @param y 原点y坐标
     * @param width 宽
     * @param height 高
     */
    public static void drawingRectangular_Image( String inputFilePath,String outFilePath, int x,  
            int y, int width, int height) throws IOException {
        try {
            
            BufferedImage image = ImageIO.read(new File(inputFilePath));
            Graphics2D g =(Graphics2D) image.getGraphics();
            g.setColor(Color.YELLOW);//画笔颜色
            g.setStroke(new BasicStroke(3.0f));//设置线宽
            g.drawRect(x, y, width, height);//矩形框(原点x坐标，原点y坐标，矩形的长，矩形的宽)
            //g.fillRect(x, y, width, height);//画矩形着色块
            //g.draw3DRect(x, y, width, height,true);//画三维矩形
            
            g.dispose();
            FileOutputStream out = new FileOutputStream(outFilePath);//输出图片的地址
            ImageIO.write(image, "jpg", out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    } 
      
    /**
     * 绘图(画多边形框)
     * @param inputFilePath 图片输入路径
     * @param outFilePath 图片输出路径
     * @param x[] x轴坐标点数组
     * @param y[] y轴坐标点数组
     * @param n 坐标点数量
     * @throws IOException
     */
    public static void drawingPolygon_Image( String inputFilePath,String outFilePath, int x[],  
            int y[],int n) throws IOException {
        try {
            
            BufferedImage image = ImageIO.read(new File(inputFilePath));
            Graphics2D g =(Graphics2D) image.getGraphics();
            g.setColor(Color.YELLOW);//画笔颜色
            g.setStroke(new BasicStroke(3.0f));//设置线宽
            
            //int x[]={860,650,300,1700};
            //int y[]={20,20,1000,1000};
            g.drawPolygon(x,y,n);// 画多边形
            g.dispose();
            FileOutputStream out = new FileOutputStream(outFilePath);//输出图片的地址
            ImageIO.write(image, "jpg", out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    } 
    
    /**  
     * 添加图片水印 
     * @param iconPath 水印图片路径
     * @param inputFilePath 源图片路径  
     * @param outFilePath 图片输出路径  
     * @param degree 水印图片旋转角度  
     */  
    public static void imageWatermarking_Image(String iconPath, String inputFilePath,String outFilePath, Integer degree) {   
        try {   
            Image srcImg = ImageIO.read(new File(inputFilePath));
            
            BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),
                    srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);

            // 得到画笔对象   
            // Graphics g= buffImg.getGraphics();   
            Graphics2D g = buffImg.createGraphics();   

            // 设置对线段的锯齿状边缘处理   
            g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                    RenderingHints.VALUE_INTERPOLATION_BILINEAR);   

            g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null), srcImg   
                    .getHeight(null), Image.SCALE_SMOOTH), 0, 0, null);   

            if (degree != null) {
                // 设置水印旋转 
                g.rotate(Math.toRadians(degree),
                        (double) buffImg.getWidth() / 2,
                        (double) buffImg.getHeight() / 2);
            }

            // 水印图象的路径 水印一般为gif或者png的，这样可设置透明度   
            ImageIcon imgIcon = new ImageIcon(iconPath);

            // 得到Image对象。
            Image img = imgIcon.getImage();
  
            float alpha = 0.4f; // 透明度 
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,alpha));

            // 表示水印图片的位置 
            g.drawImage(img, 15, 30, null);

            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));

            g.dispose();

            OutputStream out = new FileOutputStream(outFilePath);

            // 生成图片
            ImageIO.write(buffImg, "jpg", out);

            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
     /**
      * 添加文字水印
      * @param inputFilePath 源图片路径
      * @param outFilePath 保存的图片路径
      * @param waterMarkContent 水印内容
      * @param degree 旋转角度
      * @param xmove 水印间距
      * @param ymove 水印间距
      */
     public static void textWatermarking_Image(String inputFilePath,String outFilePath,
             String waterMarkContent,Integer degree , int xmove,int ymove) {
         try {
             // 读取原图片信息
             File srcImgFile = new File(inputFilePath);// 得到文件
             Image srcImg = ImageIO.read(srcImgFile);// 文件转化为图片
             int srcImgWidth = srcImg.getWidth(null);// 获取图片的宽
             int srcImgHeight = srcImg.getHeight(null);// 获取图片的高
             // 加水印
             BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight,BufferedImage.TYPE_INT_RGB);
             Graphics2D g = bufImg.createGraphics();
             // 设置对线段的锯齿状边缘处理
             g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
             // g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
             g.drawImage(
                     srcImg.getScaledInstance(srcImg.getWidth(null),
                             srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0,null);
             // 设置水印旋转
             if (null != degree) {
                 g.rotate(Math.toRadians(degree),
                         (double) bufImg.getWidth() / 2,
                         (double) bufImg.getHeight() / 2);
             }
             Font font = new Font("宋体", Font.PLAIN, 20);
             
             g.setColor(new Color(107, 109, 106)); //水印颜色
             g.setFont(font); // 设置字体
//             g.setFont(new Font("宋体", Font.PLAIN, srcImg.getWidth(null)/300*15));
             // 设置水印文字透明度
//             g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,0.5f));
  
             // 设置水印的坐标
             int x = -srcImgWidth / 2;
             int y = -srcImgHeight / 2;
             int markWidth = font.getSize() * getTextLength(waterMarkContent);// 字体长度
             int markHeight = font.getSize();// 字体高度
//             BigDecimal number= new BigDecimal(srcImg.getWidth(null));
//             BigDecimal olDnumber= new BigDecimal(800);
             
//             Integer MOVE = number.divide(olDnumber).intValue()*150;
             // 循环添加水印
             while (x < srcImgWidth * 1.5) {
                 y = -srcImgHeight / 2;
                 while (y < srcImgHeight * 1.5) {
                     g.drawString(waterMarkContent, x, y);
                     y += markHeight + ymove;
                 }
                 x += markWidth + xmove;
             }
             g.dispose();
  
             // 输出图片
             FileOutputStream outImgStream = new FileOutputStream(outFilePath);
             ImageIO.write(bufImg, "jpg", outImgStream);
             outImgStream.flush();
             outImgStream.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
    
     /**
      * 获取文本长度。汉字为1:1，英文和数字为2:1
      */
     private static int getTextLength(String text) {
         int length = text.length();
         for (int i = 0; i < text.length(); i++) {
             String s = String.valueOf(text.charAt(i));
             if (s.getBytes().length > 1) {
                 length++;
             }
         }
         length = length % 2 == 0 ? length / 2 : length / 2 + 1;
         return length;
     }
    
    public static void main(String[] args) {
        String inputFilePath = "E:/picOcr/original/20200615000000001.jpg";
        String outFilePath = "E:/picOcr/interception/20200615000000001.jpg";
        
        String iconPath = "E:/picOcr/2020592210413248.jpg";
        
        try {
            //裁剪矩形
            //ImageUtils.cut_JPG(inputFilePath, outFilePath, 400,300,900,750);
            
            //ImageUtils.cut_Image(inputFilePath, outFilePath,"jpg", 400,300,900,750);
            
            //ImageUtils.cut_Image2(inputFilePath, outFilePath, 400,300,900,750);
            
            //裁剪多边形
            /*int x[]={860,650,300,1700};
            int y[]={20,20,1000,1000};
            ImageUtils.cutPolygon_Image(inputFilePath, outFilePath,x,y,4);*/
            
            //绘图多边形
            /*int x[]={860,650,400,300,1700};
            int y[]={20,20,500,1000,1000};
            ImageUtils.drawingPolygon_Image(inputFilePath, outFilePath, x, y, 5);*/
            
            //绘图矩形
            //ImageUtils.drawingRectangular_Image(inputFilePath, outFilePath, 400, 300, 900,750);
            
            
            //绘图 添加文字
            /*List<Map<String, Object>> listMap = new ArrayList<Map<String,Object>>();
            Map<String, Object> map = null;
            
            map = new HashMap<String , Object>();
            map.put("text","文字内容");
            map.put("x", 100);
            map.put("y", 100);
            listMap.add(map);
            
            map = new HashMap<String , Object>();
            map.put("text","图片注释");
            map.put("x", 100);
            map.put("y", 140);
            listMap.add(map);
            
            ImageUtils.drawingText_Image(inputFilePath, outFilePath, listMap);*/
            
            //添加图片水印
            //ImageUtils.imageWatermarking_Image(iconPath, inputFilePath, outFilePath, -45);
            
            //添加文字水印
            ImageUtils.textWatermarking_Image(inputFilePath, outFilePath, "版权所有", -45, 80, 80);
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        
    }
    
  
}

原文地址
https://www.cnblogs.com/Lixiaogang/p/13157343.html

本文链接： https://jianz.xyz/index.php/archives/197/