java识别二维码-zxing

1、pom文件中引入

<dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId><version>3.2.1</version>
</dependency><dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.3.3</version>
</dependency>

2、编写测试类，目前测试采用的是网页中的图片。可以根据需要更改图片存储地址

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;public class QRTest {public static void main(String[] args) {System.out.println(deEncodeByPath("https://xyz.bj.bcebos.com/test.JPG"));}public static String deEncodeByPath(String path){String content = null;BufferedImage image;URL url = null;try {url = new URL(path);image = ImageIO.read(url);LuminanceSource source = new BufferedImageLuminanceSource(image);Binarizer binarizer = new HybridBinarizer(source);BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);Map<DecodeHintType,Object> hints = new HashMap<>();hints.put(DecodeHintType.CHARACTER_SET,"UTF-8");Result result = new MultiFormatReader().decode(binaryBitmap,hints);System.out.println("图片中内容 : " + result.getText());content = result.getText();} catch (Exception ex) {ex.printStackTrace();}return content;}}

参考：识别文件中的条形码-zxing_扫描快递单号 zxing_txadf的博客-CSDN博客

MultiFormatReader类，可以同时解析一维/二维的条码，而QRCodeReader类仅能识别二维码。

/*** 根据图片路径解析图片中的条形码，返回Result对象** @param path* @return*/protected Result scanningImage(String path) {if (TextUtils.isEmpty(path)) {return null;}// DecodeHintType 和EncodeHintTypeHashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();hints.put(DecodeHintType.CHARACTER_SET, "utf-8"); //BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true; // 先获取原大小scanBitmap = BitmapFactory.decodeFile(path, options);options.inJustDecodeBounds = false; // 获取新的大小int sampleSize = (int) (options.outHeight / (float) 200);if (sampleSize <= 0)sampleSize = 1;options.inSampleSize = sampleSize;scanBitmap = BitmapFactory.decodeFile(path, options);RGBLuminanceSource source = new RGBLuminanceSource(scanBitmap);BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source));//仅能识别二维码
//        QRCodeReader reader = new QRCodeReader();MultiFormatReader multiFormatReader = new MultiFormatReader();try {return multiFormatReader.decode(bitmap1, hints);} catch (NotFoundException e) {e.printStackTrace();}return null;}

参考：ZXing应用详解 - 简书 (jianshu.com)

/*** 生成二维码** @param contents 二维码内容* @return 二维码的描述对象 BitMatrix* @throws WriterException 编码时出错*/
private BitMatrix encode(String contents) throws WriterException {final Map<EncodeHintType, Object> hints = new HashMap<>();hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);hints.put(EncodeHintType.CHARACTER_SET, "utf-8");return new QRCodeWriter().encode(contents, BarcodeFormat.QR_CODE, 320, 320, hints);
}

/*** 解析二维码** @param binaryBitmap 被解析的图形对象* @return 解析的结果*/
private String decode(BinaryBitmap binaryBitmap) {try {Map<DecodeHintType, Object> hints = new HashMap<>();hints.put(DecodeHintType.CHARACTER_SET, "utf-8");hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);hints.put(DecodeHintType.POSSIBLE_FORMATS, BarcodeFormat.QR_CODE);Result result = new QRCodeReader().decode(binaryBitmap, hints);return result.getText();} catch (NotFoundException | ChecksumException | FormatException e) {e.printStackTrace();return null;}
}

/*** 解析图片文件上的二维码** @param imageFile 图片文件* @return 解析的结果，null表示解析失败*/
private String decode(File imageFile) {try {BufferedImage image = ImageIO.read(imageFile);LuminanceSource luminanceSource = new BufferedImageLuminanceSource(image);Binarizer binarizer = new HybridBinarizer(luminanceSource);BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);Map<DecodeHintType, Object> hints = new HashMap<>();hints.put(DecodeHintType.CHARACTER_SET, "utf-8");hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);hints.put(DecodeHintType.POSSIBLE_FORMATS, BarcodeFormat.QR_CODE);Result result = new QRCodeReader().decode(binaryBitmap, hints);return result.getText();} catch (Exception e) {e.printStackTrace();return null;}
}

/*** 解析Bitmap中的二维码** @param bitmap* @return 解析结果，null表示解析失败*/
private String decode(Bitmap bitmap) {int width = bitmap.getWidth();int height = bitmap.getHeight();final int[] pixels = new int[width * height];bitmap.getPixels(pixels, 0, width, 0, 0, width, height);RGBLuminanceSource luminanceSource = new RGBLuminanceSource(width, height, pixels);BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource));try {final Map<DecodeHintType, Object> hints = new HashMap<>();hints.put(DecodeHintType.CHARACTER_SET, "utf-8");hints.put(DecodeHintType.POSSIBLE_FORMATS, BarcodeFormat.QR_CODE);hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);Result result = new QRCodeReader().decode(binaryBitmap, hints);return result.toString();} catch (Exception e) {e.printStackTrace();return null;}
}

参考：java截取图片一部分_java截取图片的一部分_Jinx_Q的博客-CSDN博客

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;import javax.imageio.ImageIO;
public class ImageCutUtils {public static void main(String[] args){cutImg("/Users/jinx/Downloads/21.jpg",500,600,"/Users/jinx/Downloads/24.jpg");}public static void cutImg(String path,int x,int y,String outPath) {//图片路径，截取位置坐标,输出新突破路径try {File sourcePic = new File(path);File outPic = new File(outPath);BufferedImage pic = ImageIO.read(sourcePic);int imgwidth = pic.getWidth();int imgheight = pic.getHeight();int widthInt = imgwidth/4;//截取宽度为原图的四分之一宽int heightInt = imgheight/4;//截取高度为原图的四分之一高//参数依次为，截取起点的x坐标，y坐标，截取宽度，截取高度BufferedImage pic2 = pic.getSubimage(x, y, widthInt, heightInt);//将截取的子图另行存储Image _img = pic2.getScaledInstance(imgwidth, imgheight, Image.SCALE_DEFAULT);BufferedImage image = new BufferedImage(imgwidth, imgheight, BufferedImage.TYPE_INT_RGB);Graphics2D graphics = image.createGraphics();graphics.drawImage(_img, 0, 0, null);graphics.dispose();OutputStream out = new FileOutputStream(outPic);ImageIO.write(image, "jpg", out);out.close();} catch (IOException e) {e.printStackTrace();}}}

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java识别二维码-zxing

参考：识别文件中的条形码-zxing_扫描快递单号 zxing_txadf的博客-CSDN博客

参考：ZXing应用详解 - 简书 (jianshu.com)

参考：java截取图片一部分_java截取图片的一部分_Jinx_Q的博客-CSDN博客

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