Java实现二维码的生成与解析
Posted 小郑要做干饭人
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Java实现二维码的生成与解析相关的知识，希望对你有一定的参考价值。
一.在pom文件中加入Google提供的依赖:
<!--google生成二维码-->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
二.使用Google提供的帮助类:
package com.zzx.qrcode;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import com.google.zxing.LuminanceSource;
/**
* @date: 2021/11/29/ 18:26
* @author: ZhengZiXuan
* @title: Google生成二维码
* @description: 谷歌提供的帮助类
*/
public class BufferedImageLuminanceSource extends LuminanceSource
private final BufferedImage image;
private final int left;
private final int top;
public BufferedImageLuminanceSource(BufferedImage image)
this(image, 0, 0, image.getWidth(), image.getHeight());
public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height)
super(width, height);
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
if (left + width > sourceWidth || top + height > sourceHeight)
throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
for (int y = top; y < top + height; y++)
for (int x = left; x < left + width; x++)
if ((image.getRGB(x, y) & 0xFF000000) == 0)
image.setRGB(x, y, 0xFFFFFFFF); // = white
this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
this.image.getGraphics().drawImage(image, 0, 0, null);
this.left = left;
this.top = top;
public byte[] getRow(int y, byte[] row)
if (y < 0 || y >= getHeight())
throw new IllegalArgumentException("Requested row is outside the image: " + y);
int width = getWidth();
if (row == null || row.length < width)
row = new byte[width];
image.getRaster().getDataElements(left, top + y, width, 1, row);
return row;
public byte[] getMatrix()
int width = getWidth();
int height = getHeight();
int area = width * height;
byte[] matrix = new byte[area];
image.getRaster().getDataElements(left, top, width, height, matrix);
return matrix;
public boolean isCropSupported()
return true;
public LuminanceSource crop(int left, int top, int width, int height)
return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
public boolean isRotateSupported()
return true;
public LuminanceSource rotateCounterClockwise()
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
Graphics2D g = rotatedImage.createGraphics();
g.drawImage(image, transform, null);
g.dispose();
int width = getWidth();
return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
三.创建二维码的工具类:
package com.zzx.qrcode;
import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* @date: 2021/11/29/ 18:28
* @author: ZhengZiXuan
* @title: 二维码工具类
* @description:
*/
public class QRCodeUtil
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;
private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
if (imgPath == null || "".equals(imgPath))
return image;
// 插入图片
QRCodeUtil.insertImage(image, imgPath, needCompress);
return image;
private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception
File file = new File(imgPath);
if (!file.exists())
System.err.println("" + imgPath + " 该文件不存在！");
return;
Image src = ImageIO.read(new File(imgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
// 压缩LOGO
if (needCompress)
if (width > WIDTH)
width = WIDTH;
if (height > HEIGHT)
height = HEIGHT;
Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
// 绘制缩小后的图
g.drawImage(image, 0, 0, null);
g.dispose();
src = image;
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (QRCODE_SIZE - width) / 2;
int y = (QRCODE_SIZE - height) / 2;
graph.drawImage(src, x, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
mkdirs(destPath);
// String file = new Random().nextInt(99999999)+".jpg";
// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
ImageIO.write(image, FORMAT_NAME, new File(destPath));
public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
return image;
public static void mkdirs(String destPath)
File file = new File(destPath);
// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
if (!file.exists() && !file.isDirectory())
file.mkdirs();
public static void encode(String content, String imgPath, String destPath) throws Exception
QRCodeUtil.encode(content, imgPath, destPath, false);
// 被注释的方法
/*
* public static void encode(String content, String destPath, boolean
* needCompress) throws Exception QRCodeUtil.encode(content, null, destPath,
* needCompress);
*/
public static void encode(String content, String destPath) throws Exception
QRCodeUtil.encode(content, null, destPath, false);
public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
throws Exception
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
ImageIO.write(image, FORMAT_NAME, output);
public static void encode(String content, OutputStream output) throws Exception
QRCodeUtil.encode(content, null, output, false);
public static String decode(File file) throws Exception
BufferedImage image;
image = ImageIO.read(file);
if (image == null)
return null;
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
Hashtable hints = new Hashtable();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
public static String decode(String path) throws Exception
return QRCodeUtil.decode(new File(path));
四.创建实现类:
package com.zzx.qrcode;
/**
* @date: 2021/11/29/ 18:31
* @author: ZhengZiXuan
* @title:
* @description:
*/
public class QrCodeTest
public static void main(String[] args) throws Exception
// 存放在二维码中的内容(可以写文字,也可以写路径,若写路径的话会跳转指定路径)
String text = "https://blog.csdn.net/a1422655169?spm=1000.2115.3001.5343";
/以上是关于Java实现二维码的生成与解析的主要内容，如果未能解决你的问题，请参考以下文章