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作者:朱颜祸水nvn

泉源:http://suo.im/5R6ewH

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正文如下:


# 步骤1


第一步首先建立一个通俗的 Maven 项目,然后要实现二维码功效,我们一定要使用别人提供好的 Jar 包,这里我用的是 google 提供的 jar,pom.xml 文件设置如下:

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>org.javaboy</groupId> <artifactId>QRCode</artifactId> <version>1.0-SNAPSHOT</version>

<dependencies> <!-- 添加 google 提供的二维码依赖 --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.0</version> </dependency> </dependencies>
</project>


# 步骤2


然后使用 google 提供的工具类,在项目根目录下建立一个 util 包,将所需要的工具类放进去。

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# 工具类1 (BufferedImageLuminanceSource)

不空话,直接上代码

/** * @author bai <br/> * @date 2020/7/1 9:27<br/> */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; }
@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; }
@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); }
}

# 工具类2 (QRCodeUtil)


这内里可以修改一些参数,例如二维码的尺寸,宽高等等。

/** * @author bai <br/> * @date 2020/7/1 9:29<br/> */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 hints = new Hashtable(); 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会自动建立多层目录,区别于mkdir.(mkdir若是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); } // 被注释的方式 /* * 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; Hashtable 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)); }
}


# 启动类


这一步就是挪用方式,一样平常人人使用这种功效都是为了实现营业,例如常见的扫描二维码跳转链接(页面),扫描二维码泛起文字等等。有些二维码中心还带有 Logo 这种图片,将需要嵌入二维码的图片路径准备好就没有问题。

/** * @author bai <br/> * @date 2020/7/1 9:31<br/> */public class QRCodeApplication { public static void main(String[] args) throws Exception { // 存放在二维码中的内容 // 二维码中的内容可以是文字,可以是链接等 String text = "http://www.baidu.com"; // 嵌入二维码的图片路径 //String imgPath = "C:\\Users\\Administrator\\Pictures\\img\\dog.jpg"; // 天生的二维码的路径及名称 String destPath = "C:\\Users\\bai\\Pictures\\img\\code" + System.currentTimeMillis() + ".jpg"; //天生二维码 QRCodeUtil.encode(text, null, destPath, true); // 剖析二维码 String str = QRCodeUtil.decode(destPath); // 打印出剖析出的内容 System.out.println(str); }}


# 效果截图

首先点击下方“在看”,扫码关注下面二维码

并后台回复【1223】,即可获取!!!

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