java根据链接或者文字生成二维码

Java生成二维码这个功能还挺常见的，在此记录一下我在项目中的使用：
需要的包为：

<dependency>    <groupId>com.google.zxing</groupId>    <artifactId>core</artifactId>    <version>3.3.0</version></dependency>

QRCodeUtil：

import com.google.zxing.*;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import javax.imageio.ImageIO;import java.awt.*;import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.OutputStream;import java.util.Hashtable;public class QRCodeUtil {    private static final String CHARSET = "utf-8";    private static final String FORMAT_NAME = "JPG";    // 二维码尺寸    private static final int QRCODE_SIZE = 300;    // LOGO宽度    private static final int WIDTH = 60;    // LOGO高度    private static final int HEIGHT = 60;    /**     * 生成二维码     * @param content   源内容     * @param imgPath   生成二维码保存的路径     * @param needCompress  是否要压缩     * @return      返回二维码图片     * @throws Exception     */    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {        Hashtable hints = new Hashtable();        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);        hints.put(EncodeHintType.MARGIN, 1);        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,                hints);        int width = bitMatrix.getWidth();        int height = bitMatrix.getHeight();        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);        for (int x = 0; x < width; x++) {            for (int y = 0; y < height; y++) {                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);            }        }        if (imgPath == null || "".equals(imgPath)) {            return image;        }        // 插入图片        QRCodeUtil.insertImage(image, imgPath, needCompress);        return image;    }    /**     * 在生成的二维码中插入图片     * @param source     * @param imgPath     * @param needCompress     * @throws Exception     */    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {        File file = new File(imgPath);        //System.out.println(file+"****************************");        if (!file.exists()) {            System.err.println("" + imgPath + "   该文件不存在！");            return;        }        Image src = ImageIO.read(new File(imgPath));        int width = src.getWidth(null);        int height = src.getHeight(null);        if (needCompress) { // 压缩LOGO            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 g = tag.getGraphics();            g.drawImage(image, 0, 0, null); // 绘制缩小后的图            g.dispose();            src = image;        }        // 插入LOGO        Graphics2D graph = source.createGraphics();        int x = (QRCODE_SIZE - width) / 2;        int y = (QRCODE_SIZE - 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();    }    /**     * 生成带logo二维码，并保存到磁盘     * @param content   链接或者内容     * @param imgPath   logo图片     * @param destPath  保存二维码图片的文件路径     * @param needCompress     * @throws Exception     */    public static Boolean encode(String content, String imgPath, String destPath, boolean needCompress,String random) throws Exception {        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);        if(image==null){            return false;        }        mkdirs(destPath);        String file = random + ".jpg";//生成随机文件名        ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));        return true;    }    public static void mkdirs(String destPath) {        File file = new File(destPath);        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir。(mkdir如果父目录不存在则会抛出异常)        if (!file.exists() && !file.isDirectory()) {            file.mkdirs();        }    }    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)            throws Exception {        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);        ImageIO.write(image, FORMAT_NAME, output);    }    public static void encode(String content, OutputStream output) throws Exception {        QRCodeUtil.encode(content, null, output, false);    }    /**     * 从二维码中，解析数据     * @param file  二维码图片文件     * @return   返回从二维码中解析到的数据值     * @throws Exception     */    public static String decode(File file) throws Exception {        BufferedImage image;        image = ImageIO.read(file);        if (image == null) {            return null;        }        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));        Result result;        Hashtable hints = new Hashtable();        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);        result = new MultiFormatReader().decode(bitmap, hints);        String resultStr = result.getText();        return resultStr;    }    public static String decode(String path) throws Exception {        return QRCodeUtil.decode(new File(path));    }}

接下来就可以在controller或者别处调用实现了：

生成带logo的二维码：

QRCodeUtil.encode(link,logo,destPath,true,random);

生成不带logo的二维码：

QRCodeUtil.encode(link,logo,destPath,false,random);