利用zxing生成二维码-白红宇

利用zxing生成二维码

阅读量：138 次

发布时间：2019-02-26

本文共 8654 字，大约阅读时间需要 28 分钟。

这是一个测试过得的工具类，拿来可以直接使用。

pom.xml添加


       
    
     com.google.zxing
        
    
     core
        
    
     3.3.0

工具类

QRCodeUtil

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.HashMap;import java.util.Hashtable;import java.util.Map;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 = 60;	// LOGO高度	private static final int HEIGHT = 60; 	private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {		//没有考虑多线程和并发所以用hashMap就可以了，如果担心可以使用hashtable//		Map
   
     hints = new Hashtable
    
     ();		Map
     
       hints=new HashMap
      
       ();		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) 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));		ImageIO.write(image, FORMAT_NAME, new File(destPath));	} 	public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);		return image;	} 	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);	}	// 被注释的方法	/*	 * 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;		Map
       
         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)); } }

BufferedImageLuminanceSource

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);	} }

main 方法测试

public class QrCodeTest {	 	public static void main(String[] args) throws Exception {		// 存放在二维码中的内容		String text = "https://blog.csdn.net/liuno0";		// 嵌入二维码的图片路径		String imgPath = "E:/图像/juan_/juan_backup3.jpg";		// 生成的二维码的路径及名称		String destPath = "D:/liunn/liunn.jpg";		//生成二维码		QRCodeUtil.encode(text, imgPath, destPath, true);		// 解析二维码		String str = QRCodeUtil.decode(destPath);		// 打印出解析出的内容		System.out.println(str); 	} }

方法经过测试可以生成图片二维码，我放了一个网址，用手机扫描后，直接跳转到该页面。

你可能感兴趣的文章