java 合成兩張圖片或圖片與二維碼

java中偶爾會出現須要將一張小圖片嵌入大圖中或帶二維碼的海報圖片，那麼本文就是奔着這個目的來的，直接上臘肉！

zxing是生成1D和2D條形或二維碼的工具類庫，java圖形庫Graphics2D進行圖片的合成。

依賴：

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.3</version>
</dependency>

 

代碼：
如下爲合成圖片和二維碼，合成2張圖片參看第一個方法註釋掉的代碼
 

/*
 * overlapImage
 * @description：合成二維碼和圖片爲文件
 * @author 李陽
 * @date 2018/12/13
 * @params [backPicPath, code]
 * @return void
 */
public static final void combineCodeAndPicToFile(String backPicPath, BufferedImage code/*String fillPicPath*/) {
    try {
        BufferedImage big = ImageIO.read(new File(backPicPath));
        BufferedImage small = code;
        /*//合成兩個文件時使用
        BufferedImage small = ImageIO.read(new File(fillPicPath));*/
        Graphics2D g = big.createGraphics();

        //二維碼或小圖在大圖的左上角座標
        int x = (big.getWidth() - small.getWidth()) / 2;
        // int y = (big.getHeight() - small.getHeight()) / 2;
        int y = (big.getHeight() - small.getHeight() - 100);
        g.drawImage(small, x, y, small.getWidth(), small.getHeight(), null);
        g.dispose();
        //爲了保證大圖背景不變色，formatName必須爲"png"
        ImageIO.write(big, "png", new File("C:/Users/kevin/Desktop/combinePic.jpg"));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

/* 
 * combineCodeAndPicToInputstream
 * @description：合成二維碼和圖片爲輸出流，可用於下載或直接展現
 * @author 李陽
 * @date 2018/12/13
 * @params [backPicPath, code]
 * @return java.io.InputStream
 */
public static final void combineCodeAndPicToInputstream(String backPicPath, BufferedImage code, HttpServletResponse resp) {
    try {
        BufferedImage big = ImageIO.read(new File(backPicPath));
        // BufferedImage small = ImageIO.read(new File(fillPicPath));
        BufferedImage small = code;
        Graphics2D g = big.createGraphics();

        //二維碼或小圖在大圖的左上角座標
        int x = (big.getWidth() - small.getWidth()) / 2;
        int y = (big.getHeight() - small.getHeight() - 100);   //二維碼距大圖下邊距100
        g.drawImage(small, x, y, small.getWidth(), small.getHeight(), null);
        g.dispose();

        resp.addHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode("lia阿里.png","UTF-8") );//去掉這行設置header的代碼，前端訪問能夠直接展現
        //爲了保證大圖背景不變色，formatName必須爲"png"
        ImageIO.write(big, "png", resp.getOutputStream());
    } catch (Exception e) {
        e.printStackTrace();
    }
}

/* 
 * combineCodeAndPicToBase64 
 * @description：合成二維碼和圖片爲Base64，一樣可用於直接展現
 * @author 李陽
 * @date 2018/12/14
 * @params [backPicPath, code]
 * @return java.lang.String
 */
public static final String combineCodeAndPicToBase64(String backPicPath, BufferedImage code) {
    ImageOutputStream imOut = null;
    try {
        BufferedImage big = ImageIO.read(new File(backPicPath));
        // BufferedImage small = ImageIO.read(new File(fillPicPath));
        BufferedImage small = code;
        Graphics2D g = big.createGraphics();

        //二維碼或小圖在大圖的左上角座標
        int x = (big.getWidth() - small.getWidth()) / 2;
        int y = (big.getHeight() - small.getHeight() - 100);
        g.drawImage(small, x, y, small.getWidth(), small.getHeight(), null);
        g.dispose();
        //爲了保證大圖背景不變色，formatName必須爲"png"

        ByteArrayOutputStream bs = new ByteArrayOutputStream();
        imOut = ImageIO.createImageOutputStream(bs);
        ImageIO.write(big, "png", imOut);
        InputStream in = new ByteArrayInputStream(bs.toByteArray());

        byte[] bytes = new byte[in.available()];
        in.read(bytes);
        String base64 = Base64.getEncoder().encodeToString(bytes);
        System.out.println(base64);

        return "data:image/jpeg;base64," + base64;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

/* 
 * createImage 
 * @description：生成二維碼
 * @author 李陽
 * @date 2018/12/13
 * @params [content 二維碼內容, logoImgPath 中間logo, needCompress 是否壓縮]
 * @return java.awt.image.BufferedImage
 */
private static BufferedImage createImage(String content, String logoImgPath, boolean needCompress) throws IOException, WriterException {
    Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
    hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
    hints.put(EncodeHintType.MARGIN, 1);
    //200是定義的二維碼或小圖片的大小
    BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 200, 200, hints);
    int width = bitMatrix.getWidth();
    int height = bitMatrix.getHeight();
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    //循環遍歷每個像素點
    for (int x = 0; x < width; x++) {
        for (int y = 0; y < height; y++) {
            image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
        }
    }
    // 沒有logo
    if (logoImgPath == null || "".equals(logoImgPath)) {
        return image;
    }

    // 插入logo
    insertImage(image, logoImgPath, needCompress);
    return image;
}

/* 
 * insertImage 
 * @description：二維碼插入logo
 * @author 李陽
 * @date 2018/12/13
 * @params [source, logoImgPath, needCompress]
 * @return void
 */
private static void insertImage(BufferedImage source, String logoImgPath, boolean needCompress) throws IOException {
    File file = new File(logoImgPath);
    if (!file.exists()) {
        return;
    }

    Image src = ImageIO.read(new File(logoImgPath));
    int width = src.getWidth(null);
    int height = src.getHeight(null);
    //處理logo
    if (needCompress) {
        if (width > WIDTH) {
            width = WIDTH;
        }

        if (height > HEIGHT) {
            height = HEIGHT;
        }

        Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
        BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics gMaker = tag.getGraphics();
        gMaker.drawImage(image, 0, 0, null); // 繪製縮小後的圖
        gMaker.dispose();
        src = image;
    }

    // 在中心位置插入logo
    Graphics2D graph = source.createGraphics();
    int x = (200 - width) / 2;
    int y = (200 - height) / 2;
    graph.drawImage(src, x, y, width, height, null);
    Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
    graph.setStroke(new BasicStroke(3f));
    graph.draw(shape);
    graph.dispose();
}

public static final void main(String[] args) throws IOException, WriterException {
    BufferedImage code = createImage("https://my.oschina.net/kevin2kelly", null, false);
    combineCodeAndPicToFile("C:/Users/kevin/Desktop/無標題.png", code);
    combineCodeAndPicToBase64("C:/Users/kevin/Desktop/無標題.png", code);
}

 

填充圖片:


背景圖和合成圖片：
圖一爲原始背景圖，第二圖爲base64在瀏覽器訪問效果，三爲2張圖合成，四圖爲圖片和二維碼合成。

 

參考：
http://www.zhaochengquan.com/2018/03/29/%E5%9F%BA%E4%BA%8EZXing%E7%9A%84%E4%BA%8C%E7%BB%B4%E7%A0%81%E8%87%AA%E5%8A%A8%E7%94%9F%E6%88%90%E4%B8%8E%E5%9B%BE%E7%89%87%E5%90%88%E6%88%90/

https://blog.csdn.net/qq_35971258/article/details/80593500