QRCode生成二维码(java)
2016-07-15 16:53
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package test; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import javax.imageio.ImageIO; import com.swetake.util.Qrcode; /** * QRCode方式生成二维码 * @author * */ public class QRCodeEncoderHandler { public void encoderQRCode(String content, String imgPath) { try { Qrcode qrcodeHandler = new Qrcode(); // 设置二维码排错率,可选L(7%)、M(15%)、Q(25%)、H(30%),排错率越高可存储的信息越少,但对二维码清晰度的要求越小 qrcodeHandler.setQrcodeErrorCorrect('H'); qrcodeHandler.setQrcodeEncodeMode('B'); qrcodeHandler.setQrcodeVersion(5); System.out.println(content); byte[] contentBytes = content.getBytes("gb2312"); BufferedImage bufImg = new BufferedImage(115, 115, BufferedImage.TYPE_INT_RGB); Graphics2D gs = bufImg.createGraphics(); gs.setBackground(Color.WHITE); gs.clearRect(0, 0, 115, 115); // 设定图像颜色> BLACK gs.setColor(Color.BLACK); // 设置偏移量 不设置可能导致解析出错 int pixoff = 2; // 输出内容> 二维码 if (contentBytes.length > 0 && contentBytes.length < 800) { boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes); for (int i = 0; i < codeOut.length; i++) { for (int j = 0; j < codeOut.length; j++) { if (codeOut[j][i]) { gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3); } } } } else { System.err.println("QRCode content bytes length = " + contentBytes.length + " not in [ 0,120 ]. "); } gs.dispose(); bufImg.flush(); File imgFile = new File(imgPath); if(!imgFile.exists()){ imgFile.mkdirs(); } // 生成二维码QRCode图片 ImageIO.write(bufImg, "png", imgFile); } catch (Exception e) { e.printStackTrace(); } } /** * @param args * the command line arguments */ public static void main(String[] args) { //取当前时间为图片名称 带毫秒的 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS"); Date d = new Date(); String str = sdf.format(d); String imgPath = "D:/qrcode/" + str + ".png"; String content = "这是测试"; QRCodeEncoderHandler handler = new QRCodeEncoderHandler(); handler.encoderQRCode(content, imgPath); System.out.println("imgPath:" + imgPath); System.out.println("encoder QRcode success"); } } package test; import com.google.zxing.common.BitMatrix; import javax.imageio.ImageIO; import java.io.File; import java.io.OutputStream; import java.io.IOException; import java.awt.image.BufferedImage; public final class MatrixToImageWriter { private static final int BLACK = 0xFF000000; private static final int WHITE = 0xFFFFFFFF; private MatrixToImageWriter() { } public static BufferedImage toBufferedImage(BitMatrix matrix) { int width = matrix.getWidth(); int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE); } } return image; } public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, file)) { throw new IOException("Could not write an image of format " + format + " to " + file); } } public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, stream)) { throw new IOException("Could not write an image of format " + format); } } } package test; import java.io.File; import java.util.HashMap; import java.util.Map; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.common.BitMatrix; public class ZxingTest { /** * @param args * @throws Exception */ public static void main(String[] args) { try { String content = "这是测试xing二维码生成"; //String path = ServletActionContext.getServletContext().getRealPath("/"); //路径 String path = "D:/qrcode/ssdddd"; MultiFormatWriter multiFormatWriter = new MultiFormatWriter(); Map hints = new HashMap(); // 内容所使用编码 hints.put(EncodeHintType.CHARACTER_SET, "gb2312"); BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints); // 生成二维码 File outputFile = new File(path, "xx.jpg"); //路径不在,创建 if(!outputFile.exists()){ outputFile.mkdirs(); } MatrixToImageWriter.writeToFile(bitMatrix, "jpg", outputFile); } catch (Exception e) { e.printStackTrace(); } } } //传到页面 package test; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class CodeServlet */ @WebServlet("/CodeServlet") public class CodeServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String content = "姓名:wusir 电话:123687495"; EncoderHandler encoder = new EncoderHandler(); encoder.encoderQRCoder(content, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } } //页面代码 <img style="height:180px;width:180px" src="./CodeServlet"/>
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