Java：Java编程实现导出二维码
【摘要】 Java：Java编程实现导出二维码
目录
输出结果
代码设计
输出结果
更新……
代码设计
public class QRCodeUtil { private static final String CHARSET = "utf-8"; private static final String ...
Java：Java编程实现导出二维码
目录
输出结果
更新……
代码设计
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public class QRCodeUtil {
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private static final String CHARSET = "utf-8";
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private static final String FORMAT_NAME = "JPG";
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// 二维码尺寸
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private static final int QRCODE_SIZE = 300;
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// LOGO宽度
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private static final int WIDTH = 60;
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// LOGO高度
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private static final int HEIGHT = 60;
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private static BufferedImage createImage(String content, String imgPath,
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boolean needCompress) throws Exception {
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Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
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hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
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hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
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hints.put(EncodeHintType.MARGIN, 1);
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BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
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BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
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int width = bitMatrix.getWidth();
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int height = bitMatrix.getHeight();
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BufferedImage image = new BufferedImage(width, height,
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BufferedImage.TYPE_INT_RGB);
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for (int x = 0; x < width; x++) {
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for (int y = 0; y < height; y++) {
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image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000
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: 0xFFFFFFFF);
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}
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}
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if (imgPath == null || "".equals(imgPath)) {
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return image;
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}
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// 插入图片
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QRCodeUtil.insertImage(image, imgPath, needCompress);
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return image;
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}
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private static void insertImage(BufferedImage source, String imgPath,
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boolean needCompress) throws Exception {
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File file = new File(imgPath);
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if (!file.exists()) {
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System.err.println(""+imgPath+" 该文件不存在！");
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return;
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}
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Image src = ImageIO.read(new File(imgPath));
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int width = src.getWidth(null);
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int height = src.getHeight(null);
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if (needCompress) { // 压缩LOGO
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if (width > WIDTH) {
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width = WIDTH;
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}
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if (height > HEIGHT) {
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height = HEIGHT;
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}
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Image image = src.getScaledInstance(width, height,
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Image.SCALE_SMOOTH);
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BufferedImage tag = new BufferedImage(width, height,
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BufferedImage.TYPE_INT_RGB);
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Graphics g = tag.getGraphics();
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g.drawImage(image, 0, 0, null); // 绘制缩小后的图
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g.dispose();
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src = image;
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}
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// 插入LOGO
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Graphics2D graph = source.createGraphics();
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int x = (QRCODE_SIZE - width) / 2;
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int y = (QRCODE_SIZE - height) / 2;
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graph.drawImage(src, x, y, width, height, null);
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Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
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graph.setStroke(new BasicStroke(3f));
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graph.draw(shape);
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graph.dispose();
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}
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public static void encode(String content, String imgPath, String destPath,
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boolean needCompress) throws Exception {
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BufferedImage image = QRCodeUtil.createImage(content, imgPath,
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needCompress);
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mkdirs(destPath);
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String file = new Random().nextInt(99999999)+".jpg";
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ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
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}
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public static void mkdirs(String destPath) {
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File file =new File(destPath);
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//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)
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if (!file.exists() && !file.isDirectory()) {
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file.mkdirs();
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}
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}
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/**
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* 生成二维码(内嵌LOGO)
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*
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* @param content
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* 内容
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* @param imgPath
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* LOGO地址
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* @param destPath
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* 存储地址
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* @throws Exception
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*/
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public static void encode(String content, String imgPath, String destPath)
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throws Exception {
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QRCodeUtil.encode(content, imgPath, destPath, false);
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}
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/**
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* 生成二维码
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*
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* @param content
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* 内容
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* @param destPath
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* 存储地址
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* @param needCompress
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* 是否压缩LOGO
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* @throws Exception
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*/
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public static void encode(String content, String destPath,
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boolean needCompress) throws Exception {
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QRCodeUtil.encode(content, null, destPath, needCompress);
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}
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/**
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* 生成二维码
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*
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* @param content
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* 内容
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* @param destPath
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* 存储地址
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* @throws Exception
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*/
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public static void encode(String content, String destPath) throws Exception {
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QRCodeUtil.encode(content, null, destPath, false);
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}
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/**
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* 生成二维码(内嵌LOGO)
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*
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* @param content
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* 内容
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* @param imgPath
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* LOGO地址
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* @param output
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* 输出流
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* @param needCompress
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* 是否压缩LOGO
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* @throws Exception
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*/
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public static void encode(String content, String imgPath,
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OutputStream output, boolean needCompress) throws Exception {
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BufferedImage image = QRCodeUtil.createImage(content, imgPath,
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needCompress);
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ImageIO.write(image, FORMAT_NAME, output);
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}
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/**
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* 生成二维码
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*
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* @param content
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* 内容
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* @param output
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* 输出流
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* @throws Exception
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*/
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public static void encode(String content, OutputStream output)
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throws Exception {
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QRCodeUtil.encode(content, null, output, false);
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}
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/**
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* 解析二维码
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*
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* @param file
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* 二维码图片
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* @return
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* @throws Exception
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*/
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public static String decode(File file) throws Exception {
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BufferedImage image;
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image = ImageIO.read(file);
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if (image == null) {
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return null;
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}
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BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
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image);
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BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
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Result result;
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Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
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hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
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result = new MultiFormatReader().decode(bitmap, hints);
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String resultStr = result.getText();
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return resultStr;
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}
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/**
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* 解析二维码
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*
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* @param path
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* 二维码图片地址
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* @return
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* @throws Exception
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*/
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public static String decode(String path) throws Exception {
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return QRCodeUtil.decode(new File(path));
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}
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public static void main(String[] args) throws Exception {
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String text = "http://www.jason-niu.com";
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QRCodeUtil.encode(text, "G:/创业/云崖牛logo小.jpg", "G:/创业/云崖牛barcode", true);
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}
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}
文章来源: yunyaniu.blog.csdn.net，作者：一个处女座的程序猿，版权归原作者所有，如需转载，请联系作者。
原文链接：yunyaniu.blog.csdn.net/article/details/90037208
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