java链接生成二维码-改编

墨蓝 2022-09-23 13:59 94阅读 0赞

1、涉及的jar包下载 [ 点击下载][Link 1]

2、参考的文章链接地址 http://blog.sina.com.cn/s/blog\_5a6efa330102v1lb.html

3、可能遇到的问题：

java.lang.UnsupportedClassVersionError: com/google/zxing/LuminanceSource : Unsupported major.minor version 51.0

解决办法是：

提供参考：

http://www.111cn.net/jsp/Jsp-Servlet/45158.htm  
http://www.cnblogs.com/xiaxiaoxuan/archive/2013/03/01/2938652.html

问题本质：本地的jdk低于jdk1.7，而是用的工具jar包是jdk1.7编译的，需要安装jdk1.7并将项目的jdk设置为1.7，没有必要更改系统变量

4、代码-第一个类

import java.awt.Graphics2D;
    import java.awt.geom.AffineTransform;
    import java.awt.image.BufferedImage;
    
    import com.google.zxing.LuminanceSource;
    
    
    public class BufferedImageLuminanceSource extends LuminanceSource {
    
    	private final BufferedImage image;
        private final int left;
        private final int top;
    
        public BufferedImageLuminanceSource(BufferedImage image) {
            this(image, 0, 0, image.getWidth(), image.getHeight());
        }
    
        public BufferedImageLuminanceSource(BufferedImage image, int left,
                int top, int width, int height) {
            super(width, height);
    
            int sourceWidth = image.getWidth();
            int sourceHeight = image.getHeight();
            if (left + width > sourceWidth || top + height > sourceHeight) {
                throw new IllegalArgumentException(
                        "Crop rectangle does not fit within image data.");
            }
    
            for (int y = top; y < top + height; y++) {
                for (int x = left; x < left + width; x++) {
                    if ((image.getRGB(x, y) & 0xFF000000) == 0) {
                        image.setRGB(x, y, 0xFFFFFFFF); // = white
                    }
                }
            }
    
            this.image = new BufferedImage(sourceWidth, sourceHeight,
                    BufferedImage.TYPE_BYTE_GRAY);
            this.image.getGraphics().drawImage(image, 0, 0, null);
            this.left = left;
            this.top = top;
        }
    
       
        public byte[] getRow(int y, byte[] row) {
            if (y < 0 || y >= getHeight()) {
                throw new IllegalArgumentException(
                        "Requested row is outside the image: " + y);
            }
            int width = getWidth();
            if (row == null || row.length < width) {
                row = new byte[width];
            }
            image.getRaster().getDataElements(left, top + y, width, 1, row);
            return row;
        }
    
       
        public byte[] getMatrix() {
            int width = getWidth();
            int height = getHeight();
            int area = width * height;
            byte[] matrix = new byte[area];
            image.getRaster().getDataElements(left, top, width, height, matrix);
            return matrix;
        }
    
       
        public boolean isCropSupported() {
            return true;
        }
    
       
        public LuminanceSource crop(int left, int top, int width, int height) {
            return new BufferedImageLuminanceSource(image, this.left + left,
                    this.top + top, width, height);
        }
    
       
        public boolean isRotateSupported() {
            return true;
        }
    
       
        public LuminanceSource rotateCounterClockwise() {
            int sourceWidth = image.getWidth();
            int sourceHeight = image.getHeight();
            AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0,
                    0.0, 0.0, sourceWidth);
            BufferedImage rotatedImage = new BufferedImage(sourceHeight,
                    sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
            Graphics2D g = rotatedImage.createGraphics();
            g.drawImage(image, transform, null);
            g.dispose();
            int width = getWidth();
            return new BufferedImageLuminanceSource(rotatedImage, top,
                    sourceWidth - (left + width), getHeight(), width);
        }
    
    }

代码-第二个类

import java.awt.BasicStroke;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import java.awt.Image;
    import java.awt.Shape;
    import java.awt.geom.RoundRectangle2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.OutputStream;
    import java.util.Hashtable;
    import java.util.Random;
    
    import javax.imageio.ImageIO;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.BinaryBitmap;
    import com.google.zxing.DecodeHintType;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatReader;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.Result;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.common.HybridBinarizer;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    
    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 = 100;
        // LOGO高度
        private static final int HEIGHT = 100;
    
        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;
        }
    
       
        private static void insertImage(BufferedImage source, String imgPath,
                boolean needCompress) throws Exception {
            File file = new File(imgPath);
            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();
        }
    
       
        public static void encode(String content, String imgPath, String destPath,
                boolean needCompress,String filname) throws Exception {
            BufferedImage image = QRCodeUtil.createImage(content, imgPath,
                    needCompress);
            mkdirs(destPath);
            String file = filname+".jpg";
            ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
        }
    
       
        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, String destPath)
                throws Exception {
            QRCodeUtil.encode(content, imgPath, destPath, false,"");
        }
    
       
        public static void encode(String content, String destPath,
                boolean needCompress) throws Exception {
            QRCodeUtil.encode(content, null, destPath, needCompress,"");
        }
    
       
        public static void encode(String content, String destPath) throws Exception {
            QRCodeUtil.encode(content, null, destPath, false,"");
        }
    
       
        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);
        }
    
       
        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));
        }
       
       
        public static void main(String[] args) throws Exception {
            String text = "http://www.baidu.com";
            QRCodeUtil.encode(text, "d://a//qrcode//002.png", "d://a//qrcode", true,"二维码1");
            System.out.println("运行结束");
        }
    }

[Link 1]: http://download.csdn.net/detail/bestcxx/9577667