JAVA用QRCode生成二维码
QRCode jar下载地址:
生成:http://www.swetake.com/qrcode/index-e.html
读取:https://zh.osdn.net/projects/qrcode/
示例代码(引用自:http://www.ibloger.net/article/160.html):
package cn.utils; import java.awt.Color; import java.awt.Graphics2D; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.UnsupportedEncodingException; import javax.imageio.ImageIO; import jp.sourceforge.qrcode.QRCodeDecoder; import jp.sourceforge.qrcode.data.QRCodeImage; import jp.sourceforge.qrcode.exception.DecodingFailedException; import com.swetake.util.Qrcode; public class QRCodeUtils { /** * 编码字符串内容到目标File对象中 * * @param encodeddata 编码的内容 * @param destFile 生成file文件 1381090722 5029067275903 * @throws IOException */ public static void qrCodeEncode(String encodeddata, File destFile) throws IOException { Qrcode qrcode = new Qrcode(); qrcode.setQrcodeErrorCorrect('M'); // 纠错级别(L 7%、M 15%、Q 25%、H 30%)和版本有关 qrcode.setQrcodeEncodeMode('B'); qrcode.setQrcodeVersion(7); // 设置Qrcode包的版本 byte[] d = encodeddata.getBytes("GBK"); // 字符集 BufferedImage bi = new BufferedImage(139, 139, BufferedImage.TYPE_INT_RGB); // createGraphics // 创建图层 Graphics2D g = bi.createGraphics(); g.setBackground(Color.WHITE); // 设置背景颜色(白色) g.clearRect(0, 0, 139, 139); // 矩形 X、Y、width、height g.setColor(Color.BLACK); // 设置图像颜色(黑色) if (d.length > 0 && d.length < 123) { boolean[][] b = qrcode.calQrcode(d); for (int i = 0; i < b.length; i++) { for (int j = 0; j < b.length; j++) { if (b[j][i]) { g.fillRect(j * 3 + 2, i * 3 + 2, 3, 3); } } } } // Image img = ImageIO.read(new File("D:/tt.png")); logo // g.drawImage(img, 25, 55,60,50, null); g.dispose(); // 释放此图形的上下文以及它使用的所有系统资源。调用 dispose 之后,就不能再使用 Graphics 对象 bi.flush(); // 刷新此 Image 对象正在使用的所有可重构的资源 ImageIO.write(bi, "png", destFile); System.out.println("Input Encoded data is:" + encodeddata); } /** * 解析二维码,返回解析内容 * * @param imageFile * @return */ public static String qrCodeDecode(File imageFile) { String decodedData = null; QRCodeDecoder decoder = new QRCodeDecoder(); BufferedImage image = null; try { image = ImageIO.read(imageFile); } catch (IOException e) { System.out.println("Error: " + e.getMessage()); } try { decodedData = new String(decoder.decode(new J2SEImage(image)), "GBK"); System.out.println("Output Decoded Data is:" + decodedData); } catch (DecodingFailedException dfe) { System.out.println("Error: " + dfe.getMessage()); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return decodedData; } public static void main(String[] args) { String FilePath = "d:/qrcode.png"; File qrFile = new File(FilePath); // 二维码内容 String encodeddata = "Hello X-rapido"; try { QRCodeUtils.qrCodeEncode(encodeddata, qrFile); } catch (IOException e) { e.printStackTrace(); } // 解码 String reText = QRCodeUtils.qrCodeDecode(qrFile); System.out.println(reText); } } class J2SEImage implements QRCodeImage { BufferedImage image; public J2SEImage(BufferedImage image) { this.image = image; } public int getWidth() { return image.getWidth(); } public int getHeight() { return image.getHeight(); } public int getPixel(int x, int y) { return image.getRGB(x, y); } }