如今,二维码变成一种潮流。这里简单了解下二维码
1.二维码扫描
(1)灰度化
(2)去燥
(3)二值化流程
(4)位置探测图形
(5)译码
(6)联网传输数据
2.java进行二维码制作
(1)说明:二维码背后可以是某网址的地址、有限字数的文字等。
(2)制作逻辑:准备一个网址,将其生成二维码即可。具体实现如下图:
package com.jeecg.util.ercode; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.URL; import javax.imageio.ImageIO; import com.swetake.util.Qrcode; import jp.sourceforge.qrcode.QRCodeDecoder; import jp.sourceforge.qrcode.exception.DecodingFailedException; public class TwoDimensionCode { /** * 生成二维码(QRCode)图片 * * @param content * 存储内容 * @param imgPath * 图片路径 */ public void encoderQRCode(String content, String imgPath) { this.encoderQRCode(content, imgPath, "png", 7); } /** * 生成二维码(QRCode)图片 * * @param content * 存储内容 * @param output * 输出流 */ public void encoderQRCode(String content, OutputStream output) { this.encoderQRCode(content, output, "png", 7); } /** * 生成二维码(QRCode)图片 * * @param content * 存储内容 * @param imgPath * 图片路径 * @param imgType * 图片类型 */ public void encoderQRCode(String content, String imgPath, String imgType) { this.encoderQRCode(content, imgPath, imgType, 10); } /** * 生成带Logo的二维码(QRCode)图片 * * @param content * 存储内容 * @param imgPath * 图片路径 * @param imgType * 图片类型 */ public void encoderQRCode(String content, String imgPath, String imgType, String logoPath) { this.encoderQRCode(content, imgPath, imgType, 10, logoPath); } /** * 生成二维码(QRCode)图片 * * @param content * 存储内容 * @param output * 输出流 * @param imgType * 图片类型 */ public void encoderQRCode(String content, OutputStream output, String imgType) { this.encoderQRCode(content, output, imgType, 7); } /** * 生成二维码(QRCode)图片 * * @param content * 存储内容 * @param imgPath * 图片路径 * @param imgType * 图片类型 * @param size * 二维码尺寸 */ public void encoderQRCode(String content, String imgPath, String imgType, int size) { try { BufferedImage bufImg = this.qRCodeCommon(content, imgType, size); Graphics2D g = bufImg.createGraphics(); File imgFile = new File(imgPath); /* 加上Logo */ // File logo = new File("Img/logo.png"); File logo = new File("C:/U/a/Desktop/mm.jpg"); // File logo = new File(logoPath); // 生成二维码QRCode图片 BufferedImage logoimg = ImageIO.read(logo); /* 设置比列 一般Logo占比百分之二十 */ int widthLogo = logoimg.getWidth(null) > bufImg.getWidth() * 3 / 10 ? (bufImg.getWidth() * 3 / 10) : logoimg.getWidth(null), heightLogo = logoimg.getHeight(null) > bufImg.getHeight() * 3 / 10 ? (bufImg.getHeight() * 3 / 10) : logoimg.getWidth(null); /* 设置居中 */ int x = (bufImg.getWidth() - widthLogo) / 2; int y = (bufImg.getHeight() - heightLogo) / 2; g.drawImage(logoimg, x, y, widthLogo, heightLogo, null); ImageIO.write(bufImg, imgType, imgFile); } catch (Exception e) { e.printStackTrace(); } } /** * 20171130 生成二维码(QRCode)图片 * * @param content * 存储内容 * @param imgPath * 图片路径 * @param imgType * 图片类型 * @param size * 二维码尺寸 */ public void encoderQRCode(String content, String imgPath, String imgType, int size, String logoPath) { try { BufferedImage bufImg = this.qRCodeCommon(content, imgType, size); Graphics2D g = bufImg.createGraphics(); File imgFile = new File(imgPath); /* 加上Logo */ // File logo = new File(logoPath); // Tomcat生成二维码QRCode图片 BufferedImage logoimg = ImageIO.read(new URL(logoPath)); // 本地生成二维码 // BufferedImage logoimg = ImageIO.read(new File(logoPath)); /* 设置比列 一般Logo占比百分之二十 */ int widthLogo = logoimg.getWidth(null) > bufImg.getWidth() * 3 / 10 ? (bufImg.getWidth() * 3 / 10) : logoimg.getWidth(null), heightLogo = logoimg.getHeight(null) > bufImg.getHeight() * 3 / 10 ? (bufImg.getHeight() * 3 / 10) : logoimg.getWidth(null); /* 设置居中 */ int x = (bufImg.getWidth() - widthLogo) / 2; int y = (bufImg.getHeight() - heightLogo) / 2; g.drawImage(logoimg, x, y, widthLogo, heightLogo, null); ImageIO.write(bufImg, imgType, imgFile); } catch (Exception e) { e.printStackTrace(); } } /** * 生成二维码(QRCode)图片 * * @param content * 存储内容 * @param output * 输出流 * @param imgType * 图片类型 * @param size * 二维码尺寸 */ public void encoderQRCode(String content, OutputStream output, String imgType, int size) { try { BufferedImage bufImg = this.qRCodeCommon(content, imgType, size); // 生成二维码QRCode图片 ImageIO.write(bufImg, imgType, output); } catch (Exception e) { e.printStackTrace(); } } /** * 生成二维码(QRCode)图片的公共方法 * * @param content * 存储内容 * @param imgType * 图片类型 * @param size * 二维码尺寸 * @return */ private BufferedImage qRCodeCommon(String content, String imgType, int size) { BufferedImage bufImg = null; 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('M'); qrcodeHandler.setQrcodeEncodeMode('B'); // 设置设置二维码尺寸,取值范围1-40,值越大尺寸越大,可存储的信息越大 qrcodeHandler.setQrcodeVersion(size); // 获得内容的字节数组,设置编码格式 byte[] contentBytes = content.getBytes("utf-8"); // 图片尺寸 int imgSize = 67 + 12 * (size - 1); bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB); Graphics2D gs = bufImg.createGraphics(); // 设置背景颜色 gs.setBackground(Color.WHITE); gs.clearRect(0, 0, imgSize, imgSize); // 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 { throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800]."); } gs.dispose(); bufImg.flush(); } catch (Exception e) { e.printStackTrace(); } return bufImg; } /** * 解析二维码(QRCode) * * @param imgPath * 图片路径 * @return */ public String decoderQRCode(String imgPath) { // QRCode 二维码图片的文件 File imageFile = new File(imgPath); BufferedImage bufImg = null; String content = null; try { bufImg = ImageIO.read(imageFile); QRCodeDecoder decoder = new QRCodeDecoder(); content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8"); } catch (IOException e) { System.out.println("Error: " + e.getMessage()); e.printStackTrace(); } catch (DecodingFailedException dfe) { System.out.println("Error: " + dfe.getMessage()); dfe.printStackTrace(); } return content; } /** * 解析二维码(QRCode) * * @param input * 输入流 * @return */ public String decoderQRCode(InputStream input) { BufferedImage bufImg = null; String content = null; try { bufImg = ImageIO.read(input); QRCodeDecoder decoder = new QRCodeDecoder(); content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8"); } catch (IOException e) { System.out.println("Error: " + e.getMessage()); e.printStackTrace(); } catch (DecodingFailedException dfe) { System.out.println("Error: " + dfe.getMessage()); dfe.printStackTrace(); } return content; } public static void main(String[] args) { // String TshortURL="http://120.27.11.218:8007/a/RFreIz"; String TshortURL = "http://120.27.11.218:8008/jeecg-master/userErftlCon.do?shortUrl=eiYnq2"; String logoPath2 = "E:/j2eeWorkspace/jeecg-master/src/main/webapp/images/equipment.png"; String imgPath = "F:/U/A/Desktop/user.png"; String imgPath2 = "F:/U/A/Desktop/equipment.png"; String logoPath = "E:/j2eeWorkspace/jeecg-master/src/main/webapp/images/user.png"; TwoDimensionCode handler = new TwoDimensionCode(); handler.encoderQRCode(TshortURL, imgPath, "png", logoPath); System.out.println("======== encoder success"); } }
引用类:
package com.jeecg.util.ercode; import java.awt.image.BufferedImage; import jp.sourceforge.qrcode.data.QRCodeImage; /*二维码图片对象*/ public class TwoDimensionCodeImage implements QRCodeImage { BufferedImage bufImg; public TwoDimensionCodeImage(BufferedImage bufImg) { this.bufImg = bufImg; } @Override public int getHeight() { // TODO Auto-generated method stub return bufImg.getHeight(); } @Override public int getPixel(int x, int y) { // TODO Auto-generated method stub return bufImg.getRGB(x, y); } @Override public int getWidth() { // TODO Auto-generated method stub return bufImg.getWidth(); } }