java 二维码 生成和解析 (中间:图片、文字;底部:文字)

一、准备工作

下载QR二维码包。

首先得下载zxing.jar 包, 我这里用的是3.3版本的core包

下载地址:现在已经迁移到了github:https://github.com/zxing/zxing/wiki/Getting-Started-Developing,

当然你也可以从maven仓库下载jar包:http://central.maven.org/maven2/com/google/zxing/core/

二、代码

part1:

import com.google.zxing.LuminanceSource; import java.awt.Graphics2D;import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage;  /**  *   * @author yuki_ho  * 辅助类  */ public final 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;   } // 这里要得到指定行的像素数据     @Override   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;   }    // 返回我们生成好的像素数据    @Override   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;   }    @Override   public boolean isCropSupported() {     return true;   }    @Override   public LuminanceSource crop(int left, int top, int width, int height) {     return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);   }    @Override   public boolean isRotateSupported() {     return true;   }    @Override   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);   }}

part2:

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.IOException;import java.io.OutputStream;import java.util.Hashtable;import java.util.UUID;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;/**  * 二维码 生成、解析器 帮助类  * @author yuki_ho  *  */  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;                    /**          *  检查路径 图片是否存在          * @param imgPath          * @return          * @throws IOException          */          private static BufferedImage CheckImageExist(String imgPath) throws IOException{              File file = new File(imgPath);              if (!file.exists()) {                  System.err.println(""+imgPath+"   该文件不存在！");                  return null;              }              BufferedImage src = ImageIO.read(new File(imgPath));              return src;          }                            /**          * 创建 二维码所需图片           * @param content   内容          * @param imgPath   Logo图片地址          * @param needCompress 是否压缩Logo大小         * @param needDescription 是否需要底部描述          * @return            * @throws Exception          */          private static BufferedImage createImage(String content,BufferedImage logoImage, String bottomDes,                boolean needCompress) throws Exception {              Hashtable hints = new Hashtable();              hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //容错级别 H->30%              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();             int tempHeight = height;            boolean needDescription=(null==bottomDes&&"".equals(bottomDes));            if (needDescription) {                tempHeight += 30;            }             BufferedImage image = new BufferedImage(width, tempHeight,                      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(null==logoImage)                   return image;                            // 插入图片              QRCodeUtil.insertImage(image, logoImage, needCompress);                        if(needDescription)                 return image;                        QRCodeUtil.addFontImage(image, bottomDes);                        return image;          }                /**         * 添加 底部图片文字         * @param source   图片源         * @param declareText 文字本文         */        private static void addFontImage(BufferedImage source, String declareText) {            BufferedImage textImage = FontImage.getImage(declareText, QRCODE_SIZE, 50);            Graphics2D graph = source.createGraphics();                        int width = textImage.getWidth(null);              int height = textImage.getHeight(null);                            Image src =textImage;              graph.drawImage(src, 0, QRCODE_SIZE - 20, width, height, null);               graph.dispose();          }        /**          *  插入Logo图片          * @param source    图片操作对象          * @param imgPath   Logo图片地址          * @param needCompress 是否压缩Logo大小          * @throws Exception          */          private static void insertImage(BufferedImage source,BufferedImage logoImage,                  boolean needCompress) throws Exception {              int width = logoImage.getWidth(null);              int height = logoImage.getHeight(null);                            Image src =logoImage;              if (needCompress) {                 if (width > WIDTH) {                      width = WIDTH;                  }                  if (height > HEIGHT) {                      height = HEIGHT;                  }                    Image  image = logoImage.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);                 g.dispose();                  src = image;              }              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();          }            /**          * 创建 目录          * @param destPath          */          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();                  }              }                            /**          *  生成二维码 (以Logo路径)          * @param content  内容 (若带http:// 会自动跳转)          * @param imgPath  Logo 图片地址          * @param destPath   保存二维码 地址 (没有该目录会自动创建)          * @param bottomDes 底部文字描述         * @param needCompress 是否压缩Logo大小          * @throws Exception          */          public static void encodeOfPath(String content, String imgPath,String bottomDes,String destPath,                  boolean needCompress) throws Exception {                            BufferedImage image = QRCodeUtil.createImage(content, CheckImageExist(imgPath),                      bottomDes,needCompress);              mkdirs(destPath);              String file = UUID.randomUUID().toString()+".jpg";              ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));          }                    /**         *          * @param content 内容             * @param logoImage  图片源 LOGO         * @param bottomDes 底部描述文字         * @param destPath   保存二维码 地址 (没有该目录会自动创建)         * @param needCompress  是否压缩logo         * @throws Exception         */        public static void encode(String content, BufferedImage logoImage,String bottomDes, String destPath,                  boolean needCompress) throws Exception {                            BufferedImage image = QRCodeUtil.createImage(content, logoImage, bottomDes,                     needCompress);              mkdirs(destPath);              String file = UUID.randomUUID().toString()+".jpg";              ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));          }                  /**         *          * @param content  内容             * @param logoImage  图片源LOGO         * @param bottomDes 底部描述文字         * @param picName   图片名         * @param destPath     保存二维码 地址 (没有该目录会自动创建)         * @param needCompress 是否压缩logo         * @throws Exception         */        public static void encode(String content, BufferedImage logoImage,String bottomDes,String picName,String destPath,                  boolean needCompress) throws Exception {                      BufferedImage image=QRCodeUtil.createImage(content, logoImage,bottomDes,                         needCompress);                  mkdirs(destPath);              String file = picName+".jpg";              ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));          }                 /**         *          * @param content  内容         * @param destPath     保存二维码 地址 (没有该目录会自动创建)         * @throws Exception         */        public static void encode(String content, String destPath) throws Exception {              QRCodeUtil.encode(content, null,null,destPath, false);          }            /**         *            * @param content   内容         * @param imgPath    图片源地址LOGO         * @param bottomDes 底部描述文字         * @param output    输出流         * @param needCompress 是否压缩logo         * @throws Exception         */        public static void encodeOfPath(String content, String imgPath,String bottomDes,                  OutputStream output, boolean needCompress) throws Exception {              BufferedImage image = QRCodeUtil.createImage(content, CheckImageExist(imgPath), bottomDes,                     needCompress);              ImageIO.write(image, FORMAT_NAME, output);          }                    /**         *          * @param content  内容         * @param Image        图片源LOGO         * @param bottomDes 底部描述文字         * @param output    输出流         * @param needCompress 是否压缩         * @throws Exception         */        public static void encode(String content, BufferedImage Image,String bottomDes,                  OutputStream output, boolean needCompress) throws Exception {              BufferedImage image = QRCodeUtil.createImage(content, Image, bottomDes,                      needCompress);              ImageIO.write(image, FORMAT_NAME, output);          }                    /**         *          * @param content 内容         * @param output    输出流         * @throws Exception         */        public static void encode(String content, OutputStream output)                  throws Exception {              QRCodeUtil.encode(content, null,null, output, false);          }            /**          * 解析 二维码          * @param file 图片文件          * @return          * @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;          }             /**          *  解析二维码          * @param path 图片地址          * @return          * @throws Exception          */         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.encodeOfPath(text, "d:/test/a1.jpg",null,"d:/test", true);  //            QRCodeUtil.encode(text,"d:/test"); // 不带logo             BufferedImage bi = ImageIO.read(new File("d:/test/a1.jpg"));               QRCodeUtil.encode(text,bi,"ok","123","d:/test", true);        }                    }

三、调用测试

如果要 中间写文字可以参考:地址