How to Read Or Parse QR Code in Java

本文主要是介绍How to Read Or Parse QR Code in Java，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

摘要：有个群友在群里问，二维码生成和解析用java怎么做，正好有空，我也写了下，记录一下，有需要的同学可以参考下，这里主要是使用了Google的一个开源包zxing。

一：导入zxing的依赖，如下：

<dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.2.1</version></dependency>

二：ZxingUtils工具类，其中包括生成二维码，解析二维码方法：

package com.micai.springboot.util;import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.EnumMap;
import java.util.Map;import javax.imageio.ImageIO;import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;/*** @Auther: zhaoxinguo* @Date: 2018/7/24 15:00* @Description: 二维码工具类*/
public class ZxingUtils {/*** 生成二维码* @param fromUrl* @param toUrl*/public static void createQrCode(String fromUrl, String toUrl) {String myCodeText = fromUrl;String filePath = toUrl;int size = 250;String fileType = "png";File myFile = new File(filePath);try {Map<EncodeHintType, Object> hintMap = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8");// Now with zxing version 3.2.1 you could change border size (white border size to just 1)hintMap.put(EncodeHintType.MARGIN, 1); /* default = 4 */hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);QRCodeWriter qrCodeWriter = new QRCodeWriter();BitMatrix byteMatrix = qrCodeWriter.encode(myCodeText, BarcodeFormat.QR_CODE, size, size, hintMap);int CrunchifyWidth = byteMatrix.getWidth();BufferedImage image = new BufferedImage(CrunchifyWidth, CrunchifyWidth, BufferedImage.TYPE_INT_RGB);image.createGraphics();Graphics2D graphics = (Graphics2D) image.getGraphics();graphics.setColor(Color.WHITE);graphics.fillRect(0, 0, CrunchifyWidth, CrunchifyWidth);graphics.setColor(Color.BLACK);for (int i = 0; i < CrunchifyWidth; i++) {for (int j = 0; j < CrunchifyWidth; j++) {if (byteMatrix.get(i, j)) {graphics.fillRect(i, j, 1, 1);}}}ImageIO.write(image, fileType, myFile);} catch (WriterException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}System.out.println("\n\nYou have successfully created QR Code.");}/*** 解析二维码* @param filePath* @return*/public static String readQRCode(String filePath) {File file = new File(filePath);BufferedImage image = null;BinaryBitmap bitmap = null;Result result = null;try {image = ImageIO.read(file);int[] pixels = image.getRGB(0, 0, image.getWidth(), image.getHeight(), null, 0, image.getWidth());RGBLuminanceSource source = new RGBLuminanceSource(image.getWidth(), image.getHeight(), pixels);bitmap = new BinaryBitmap(new HybridBinarizer(source));} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}if (bitmap == null)return null;QRCodeReader reader = new QRCodeReader();try {result = reader.decode(bitmap);return result.getText();} catch (NotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ChecksumException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (FormatException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}public static void main(String [] args) {String myCodeText = "https://blog.csdn.net/sxdtzhaoxinguo/";String filePath = "D://CrunchifyQR.png";
//        createQrCode(myCodeText, filePath);String readQRCode = readQRCode(filePath);System.out.println(readQRCode);}
}

三：运行结果：

1.生成二维码：