java实现在一张大图片上添加小图及文字

2024-04-02 19:55

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在一张大图上添加小图及文字


import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageDecoder;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.text.ParseException;
public class ImgUtil {
    public static void main(String[] args) throws ParseException {
        String bigImg = "C:\\Users\\langz\\Desktop\\ffff\\big.jpg";
        String smallImg = "C:\\Users\\langz\\Desktop\\ffff\\small.jpg";
        String content = "好久不见，你还好吗";
        String outPath = "C:\\Users\\langz\\Desktop\\ffff\\" + System.currentTimeMillis() + ".jpg";
        try {
            bigImgAddSmallImgAndText(bigImg, smallImg, 500, 500, null, 200, 200, outPath);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public static void bigImgAddSmallImgAndText(String bigImgPath
            , String smallImgPath, int sx, int sy
            , String content, int cx, int cy
            , String outPathWithFileName) throws IOException {
        //主图片的路径
        InputStream is = new FileInputStream(bigImgPath);
        //通过JPEG图象流创建JPEG数据流解码器
        JPEGImageDecoder jpegDecoder = JPEGCodec.createJPEGDecoder(is);
        //解码当前JPEG数据流，返回BufferedImage对象
        BufferedImage buffImg = jpegDecoder.decodeAsBufferedImage();
        //得到画笔对象
        Graphics g = buffImg.getGraphics();
        //小图片的路径
        ImageIcon imgIcon = new ImageIcon(smallImgPath);
        //得到Image对象。
        Image img = imgIcon.getImage();
        //将小图片绘到大图片上,5,300 .表示你的小图片在大图片上的位置。
        g.drawImage(img, sx, sy, null);
        //设置颜色。
        g.setColor(Color.WHITE);
        //最后一个参数用来设置字体的大小
        if (content != null) {
            Font f = new Font("宋体", Font.PLAIN, 25);
            Color mycolor = Color.red;//new Color(0, 0, 255);
            g.setColor(mycolor);
            g.setFont(f);
            g.drawString(content, cx, cy); //表示这段文字在图片上的位置(cx,cy) .第一个是你设置的内容。
        }
        g.dispose();
        OutputStream os = new FileOutputStream(outPathWithFileName);
        //创键编码器，用于编码内存中的图象数据。
        JPEGImageEncoder en = JPEGCodec.createJPEGEncoder(os);
        en.encode(buffImg);
        is.close();
        os.close();
    }
}

实现给图片添加水印

某些应用场景下需要对图片加上水印防止盗用，例如微博用户图片。Java中实现添加水印需要用到BufferedImage、Graphics2D 和ImageIO类。

1. 添加文字水印


import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;

public class TextMarkProcessor {
    
    public static void main(String[] args) {
        new TextMarkProcessor().testTextMark();
    }
    public void testTextMark() {
        File class="lazy" data-srcImgFile = new File("D:/test/desktop.png");
        String logoText = "[ 天使的翅膀 ]";
        File outputRotateImageFile = new File("D:/test/desktop_text_mark.jpg");
        createWaterMarkByText(class="lazy" data-srcImgFile, logoText, outputRotateImageFile, 0);
    }
    public void createWaterMarkByText(File class="lazy" data-srcImgFile, String logoText,
                                             File outputImageFile, double degree) {
        OutputStream os = null;
        try {
            Image class="lazy" data-srcImg = ImageIO.read(class="lazy" data-srcImgFile);
            BufferedImage buffImg = new BufferedImage(class="lazy" data-srcImg.getWidth(null),
                    class="lazy" data-srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);
            Graphics2D graphics = buffImg.createGraphics();
            graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            graphics.drawImage(class="lazy" data-srcImg.getScaledInstance(class="lazy" data-srcImg.getWidth(null),
                            class="lazy" data-srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0, null);
            if (degree>0) {
                graphics.rotate(Math.toRadians(degree),
                        (double) buffImg.getWidth() / 2,
                        (double) buffImg.getHeight() / 2);
            }
            graphics.setColor(Color.RED);
            graphics.setFont(new Font("宋体", Font.BOLD, 36));
            float alpha = 0.8f;
            graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.class="lazy" data-src_ATOP,
                    alpha));
            graphics.drawString(logoText, buffImg.getWidth()/3, buffImg.getHeight()/2);
            graphics.dispose();
            os = new FileOutputStream(outputImageFile);
            // 生成图片
            ImageIO.write(buffImg, "JPG", os);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != os)
                    os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

2. 添加图片水印


import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;

public class PictureMarkProcessor {
    
    public static void main(String[] args) {
        new PictureMarkProcessor().testPictureMark();
    }
    public void testPictureMark() {
        File class="lazy" data-srcImageFile = new File("D:/test/desktop.png");
        File logoImageFile = new File("D:/test/tools.png");
        File outputRoateImageFile = new File("D:/test/desktop_pic_mark.jpg");
        createWaterMarkByIcon(class="lazy" data-srcImageFile, logoImageFile, outputRoateImageFile, 0);
    }
    public void createWaterMarkByIcon(File class="lazy" data-srcImageFile, File logoImageFile,
                                             File outputImageFile, double degree) {
        OutputStream os = null;
        try {
            Image class="lazy" data-srcImg = ImageIO.read(class="lazy" data-srcImageFile);
            BufferedImage buffImg = new BufferedImage(class="lazy" data-srcImg.getWidth(null),
                    class="lazy" data-srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);
            Graphics2D graphics = buffImg.createGraphics();
            graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            graphics.drawImage(class="lazy" data-srcImg.getScaledInstance(class="lazy" data-srcImg.getWidth(null),
                            class="lazy" data-srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0, null);
            ImageIcon logoImgIcon = new ImageIcon(ImageIO.read(logoImageFile));
            Image logoImg = logoImgIcon.getImage();
            //旋转
            if (degree>0) {
                graphics.rotate(Math.toRadians(degree),
                        (double) buffImg.getWidth() / 2,
                        (double) buffImg.getWidth() / 2);
            }
            float alpha = 0.8f; // 透明度
            graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.class="lazy" data-src_ATOP, alpha));
            //水印 的位置
            graphics.drawImage(logoImg, buffImg.getWidth()/3, buffImg.getHeight()/2, null);
            graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.class="lazy" data-src_OVER));
            graphics.dispose();
            os = new FileOutputStream(outputImageFile);
            // 生成图片
            ImageIO.write(buffImg, "JPG", os);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != os)
                    os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

实现效果如下：

原图：

这里写图片描述