java ZXing 生成二维码及条码实例分享
这里有新鲜出炉的 Java 设计模式, 程序狗速度看过来!
Java 程序设计语言
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言, 是由 Sun Microsystems 公司于 1995 年 5 月推出的 Java 程序设计语言和 Java 平台 (即 JavaEE(j2ee), JavaME(j2me), JavaSE(j2se)) 的总称
本文分享了 java ZXing 生成二维码及条码的实例代码, 具有很好的参考价值, 需要的朋友一起来看下吧
1jar 包: 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);
- }
- }
来源: http://www.phperz.com/article/18/0210/359174.html