In order to study the unified intersection management of Alipay and WeChat payment (a QR code supports WeChat and Alipay scan code payment at the same time); this article will not explain the payment development of Alipay and WeChat, mainly the generation of QR code and parsing;
steps:
1. Prepare jar package, two jar packages are used in java; one is used to generate QR code, and the other is used to parse QR code;
a. Generate QR code jar package path: http:// www.swetake.com/qr/java/qr_java.html ( Note: Download qrcode_java0.50beta10.tar.gz, after decompression, the qrcode.jar in the lib directory is the library used to generate the QR code )
b. Analysis 2 QR code jar package path: http://sourceforge.jp/projects/qrcode/releases/ ( Note: After decompressing the qrcode package, the qrcode.jar package in the lib directory should be renamed to avoid conflicts with the generated QR code jar package
2. java code a , TwoDimensionCodeImage
class: QR code image object
package com.ppfuns.aaa.entity;
import jp.sourceforge.qrcode.data.QRCodeImage;
import java.awt.image.BufferedImage;
/**
* Created with IntelliJ IDEA.
* User: jony
* Date: 2017/9/26
* Time: 9:53
* To change this template use File | Settings | File Templates.
*/
public class TwoDimensionCodeImage implements QRCodeImage {
BufferedImage bufImg;
public TwoDimensionCodeImage(BufferedImage bufImg) {
this.bufImg = bufImg;
}
@Override
public int getHeight() {
return bufImg.getHeight();
}
@Override
public int getPixel(int x, int y) {
return bufImg.getRGB(x, y);
}
@Override
public int getWidth() {
return bufImg.getWidth();
}
}
b. CommonUtils class: the core class of QR code operation
package com.ppfuns.aaa.common;
import com.ppfuns.aaa.entity.TwoDimensionCodeImage;
import com.swetake.util.Qrcode;
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.exception.DecodingFailedException;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Created with IntelliJ IDEA.
* User: Jian Dequn
* Date: 2017/9/26
* Time: 9:54
* To change this template use File | Settings | File Templates.
*/
public class CommonUtils {
/**
* Generate QRCode image
* @param content store the content
* @param imgPath image path
*/
public static void encoderQRCode(String content, String imgPath) {
encoderQRCode(content, imgPath, "png", 7);
}
/**
* Generate QRCode image
* @param content store the content
* @param output output stream
*/
public static void encoderQRCode(String content, OutputStream output) {
encoderQRCode(content, output, "png", 7);
}
/**
* Generate QRCode image
* @param content store the content
* @param imgPath image path
* @param imgType image type
*/
public static void encoderQRCode(String content, String imgPath, String imgType) {
encoderQRCode(content, imgPath, imgType, 7);
}
/**
* Generate QRCode image
* @param content store the content
* @param output output stream
* @param imgType image type
*/
public static void encoderQRCode(String content, OutputStream output, String imgType) {
encoderQRCode(content, output, imgType, 7);
}
/**
* Generate QRCode image
* @param content store the content
* @param imgPath image path
* @param imgType image type
* @param size QR code size
*/
public static void encoderQRCode(String content, String imgPath, String imgType, int size) {
try {
BufferedImage bufImg = qRCodeCommon(content, imgType, size);
File imgFile = new File(imgPath);
// Generate QRCode image of QR code
ImageIO.write(bufImg, imgType, imgFile);
} catch (Exception e) {
e.printStackTrace ();
}
}
/**
* Generate QRCode image
* @param content store the content
* @param output output stream
* @param imgType image type
* @param size QR code size
*/
public static void encoderQRCode(String content, OutputStream output, String imgType, int size) {
try {
BufferedImage bufImg = qRCodeCommon(content, imgType, size);
// Generate QRCode image of QR code
ImageIO.write(bufImg, imgType, output);
} catch (Exception e) {
e.printStackTrace ();
}
}
/**
* A public method for generating a QRCode image
* @param content store the content
* @param imgType image type
* @param size QR code size
* @return
*/
private static BufferedImage qRCodeCommon(String content, String imgType, int size) {
BufferedImage bufImg = null;
try {
Qrcode qrcodeHandler = new Qrcode();
// Set the error rate of QR code, you can choose L(7%), M(15%), Q(25%), H(30%). The higher the error rate, the less information can be stored, but The smaller the requirement for the clarity of the QR code
qrcodeHandler.setQrcodeErrorCorrect('M');
qrcodeHandler.setQrcodeEncodeMode('B');
// Set the size of the QR code, the value range is 1-40. The larger the value, the larger the size and the larger the information that can be stored.
qrcodeHandler.setQrcodeVersion(size);
// Get the byte array of the content, set the encoding format
byte[] contentBytes = content.getBytes("utf-8");
// size of the picture
int imgSize = 67 + 12 * (size - 1);
bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
// set background color
gs.setBackground(Color.WHITE);
gs.clearRect(0, 0, imgSize, imgSize);
// set image color > BLACK
gs.setColor(Color.BLACK);
// Set the offset, not setting it may cause parsing errors
int pixoff = 2;
// output content > QR code
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;
}
/**
* Parse QR Code (QRCode)
* @param imgPath image path
* @return
*/
public static String decoderQRCode(String imgPath) {
// QRCode QR code image file
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;
}
/**
* Parse QR Code (QRCode)
* @param input input stream
* @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 content = "https://k.87.re/2014/07/150724ix4.jpg";
//The picture requirement is an existing QR code picture, the generated QR code here is just an update of the content in the QR code picture
encoderQRCode(content,"C:\\Users\\lenovo\\Desktop\\121.jpg");
String path = "C:\\Users\\lenovo\\Desktop\\121.jpg";
String content1 = decoderQRCode(path);
System.out.println(content1);
//
}
}