Java ZXing は QR コードとバーコードのサンプルを生成して共有します

1. Jar パッケージ: ZXing-core-3.3.0.jar http://mvnrepository.com/artifact/com.google.zxing/core

ZXing-javase-3.3.0.jar http://mvnrepository.com /artifact/com.google.zxing/javase

BufferedImageLuminanceSource.java

package com.webos.util;
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);
 }
}

QRCodeUtil.java

package com.webos.util;
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.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* @ClassName: QRCodeUtil
* @Description: 二维码编码
* @author Liuy
* @date 2016年7月9日 下午3:03:24
*
*/
public class QRCodeUtil {
 // 设置二维码编码格式
 private static final String CHARSET = "utf-8";
 // 保存的二维码格式
 private static final String FORMAT_NAME = "JPG";
 // 二维码尺寸
 private static final int QRCODE_SIZE = 800;
 // LOGO宽度
 private static final int LOGO_WIDTH = 80;
 // LOGO高度
 private static final int LOGO_HEIGHT = 80;
 /**
  * @Title: createImage
  * @Description: 将二维码内容创建到Image流
  * @param content 二维码内容
  * @param imgPath logo图片地址
  * @param needCompress 是否压缩logo图片大小
  * @return
  * @throws Exception 参数说明
  * @return BufferedImage 返回类型
  * @throws
  */
 private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
  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);
  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 (logoPath == null || "".equals(logoPath)) {
   return image;
  }
  // 插入logo
  QRCodeUtil.insertImage(image, logoPath, needCompress);
  return image;
 }
 /**
  * @Title: insertImage
  * @Description: 将logo插入到二维码中
  * @param source 二维码Image流
  * @param imgPath logo地址
  * @param needCompress 是否压缩大小
  * @throws Exception 参数说明
  * @return void 返回类型
  * @throws
  */
 private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {
  File file = new File(logoPath);
  if (!file.exists()) {
   System.err.println("" + logoPath + " 该文件不存在！");
   return;
  }
  Image src = ImageIO.read(new File(logoPath));
  int width = src.getWidth(null);
  int height = src.getHeight(null);
  if (needCompress) { // 压缩LOGO
   if (width > LOGO_WIDTH) {
    width = LOGO_WIDTH;
   }
   if (height > LOGO_HEIGHT) {
    height = LOGO_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();
 }
 /**
  * @Title: mkdirs
  * @Description: 创建文件夹
  * @param destPath 文件夹地址
  * @return void 返回类型
  * @throws
  */
 private static boolean 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();
   return true;
  }
  return false;
 }
 /**
  * @Title: encode
  * @Description: 生成二维码
  * @param content 二维码内容
  * @param imgPath logo图片地址
  * @param destPath 目标保存地址
  * @param needCompress 是否压缩logo图片大小
  * @throws Exception 参数说明
  * @return void 返回类型
  * @throws
  */
 private static void encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {
  BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
  if (mkdirs(destPath)) {
   String file = new Random().nextInt(99999999) + ".jpg";
   ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
  }
 }
 /**
  * @Title: encode
  * @Description: 生成二维码
  * @param content 二维码内容
  * @param destPath 目标保存地址
  * @throws Exception 参数说明
  * @return void 返回类型
  * @throws
  */
 public static void encode(String content, String destPath) throws Exception {
  QRCodeUtil.encode(content, null, destPath, false);
 }
 /**
  * @Title: encode
  * @Description: 生成二维码
  * @param content 二维码内容
  * @param imgPath logo图片地址
  * @param output 输出流
  * @param needCompress 是否压缩logo图片大小
  * @throws Exception 参数说明
  * @return void 返回类型
  * @throws
  */
 public static void encode(String content, String logoPath, OutputStream output, boolean needCompress) throws Exception {
  BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
  ImageIO.write(image, FORMAT_NAME, output);
 }
 /**
  * @Title: encode
  * @Description: 生成二维码
  * @param content 二维码内容
  * @param output 输出流
  * @throws Exception 参数说明
  * @return void 返回类型
  * @throws
  */
 public static void encode(String content, OutputStream output) throws Exception {
  QRCodeUtil.encode(content, null, output, false);
 }
 /**
  * @Title: decode
  * @Description: 对二维码解码
  * @param file 文件对象
  * @return 解码后的二维码内容字符串
  * @throws Exception 参数说明
  * @return String 返回类型
  * @throws
  */
 private 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));
  Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();
  hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
  return new MultiFormatReader().decode(bitmap, hints).getText();
 }
 /**
  * @Title: decode
  * @Description: 对二维码解码
  * @param path 文件路径
  * @return
  * @throws Exception 参数说明
  * @return String 返回类型
  * @throws
  */
 public static String decode(String path) throws Exception {
  return QRCodeUtil.decode(new File(path));
 }
}

QRCodeServlet.java

package com.webos.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.webos.util.QRCodeUtil;
/*
 * Servlet implementation class QRCodeServlet
 */
@WebServlet("/QRCodeServlet")
public class QRCodeServlet extends HttpServlet {
 private static final long serialVersionUID = 1L;
 /*
  * @see HttpServlet#HttpServlet()
  */
 public QRCodeServlet() {
  super();
 }
 /*
  * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
  * response)
  */
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  try {
   String text = "http://www.baidu.com?timestamp=" + System.currentTimeMillis();
   QRCodeUtil.encode(text, response.getOutputStream());
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 /*
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
  * response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }
}

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