条形码/二维码之开源利器ZXing图文介绍
图片输出到客户端:
Java代码
- BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
- ……
- resp.setHeader(“Pragma”, “no-cache”);
- resp.setHeader(“Cache-Control”, “no-cache”);
- resp.setDateHeader(“Expires”, 0);
- resp.setContentType(“image/jpeg”);
- ServletOutputStream sos = resp.getOutputStream();
- ImageIO.write(buffImg, “jpeg”, sos);
- sos.close();
条形码/二维码之开源利器ZXing图文介绍 http://sjsky.iteye.com/blog/1142177
java二维码工具类，中间带ＬＯＧＯ的，很强大
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Xml代码 <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.2.0</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.2.0</version> </dependency> |
http://blog.csdn.net/mmm333zzz/article/details/17259513
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Java代码 package com.util.cccm; 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; /** * 二维码工具类 * */ 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; private static BufferedImage createImage(String content, String imgPath, 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 (imgPath == null || "".equals(imgPath)) { return image; } // 插入图片 QRCodeUtil.insertImage(image, imgPath, needCompress); return image; } /** * 插入LOGO * * @param source * 二维码图片 * @param imgPath * LOGO图片地址 * @param needCompress * 是否压缩 * @throws Exception */ 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(); } /** * 生成二维码(内嵌LOGO) * * @param content * 内容 * @param imgPath * LOGO地址 * @param destPath * 存放目录 * @param needCompress * 是否压缩LOGO * @throws Exception */ public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress); mkdirs(destPath); String file = new Random().nextInt(99999999)+".jpg"; ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file)); } /** * 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) * @author lanyuan * Email: mmm333zzz520@163.com * @date 2013-12-11 上午10:16:36 * @param destPath 存放目录 */ 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(内嵌LOGO) * * @param content * 内容 * @param imgPath * LOGO地址 * @param destPath * 存储地址 * @throws Exception */ public static void encode(String content, String imgPath, String destPath) throws Exception { QRCodeUtil.encode(content, imgPath, destPath, false); } /** * 生成二维码 * * @param content * 内容 * @param destPath * 存储地址 * @param needCompress * 是否压缩LOGO * @throws Exception */ public static void encode(String content, String destPath, boolean needCompress) throws Exception { QRCodeUtil.encode(content, null, destPath, needCompress); } /** * 生成二维码 * * @param content * 内容 * @param destPath * 存储地址 * @throws Exception */ public static void encode(String content, String destPath) throws Exception { QRCodeUtil.encode(content, null, destPath, false); } /** * 生成二维码(内嵌LOGO) * * @param content * 内容 * @param imgPath * LOGO地址 * @param output * 输出流 * @param needCompress * 是否压缩LOGO * @throws Exception */ 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); } /** * 生成二维码 * * @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, output, false); } /** * 解析二维码 * * @param file * 二维码图片 * @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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(); 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 * 二维码图片地址 * @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 = "薯 灯可分列式本上楞珂要瓜熟蒂落！000000000000000"; QRCodeUtil.encode(text, "c:/df.jsp", "c:/a/", true); } } |
