java 二维码码点 java实现二维码

转载

lingyuli 2024-06-13 16:28:40

文章标签 java 二维码码点 Image java Java 文章分类 Java 后端开发

title: Java实现二维码生成

categories: “Java”

前言

日前生活上存在很多扫描二维码的场景，支付、加好友…等操作都需要扫描二维码，然后我就在想Java能不能实现二维码的生成呢？百度一搜，还是有的，看了一些，决定自己试试看，所以下面是我用Java代码写的二维码实现，但是弊端就是只能在个人pc电脑上生成，没有写成一个完整的网页小功能，我想下一章博客，我会写写的。

准备工作

1.首先你得在个人pc安装Java环境。这个百度一搜，都有的，我就不写了。

2.编程环境安装好了，你得有一个好玩的编辑器软件，建议使用IntelliJ IDEA ，这个博客使用的编程编辑器，我是使用eclipse的，没想到吧，哈哈。

3.Java其实是提供了一个库来实现二维码的生成的，就是这个core-3.0.0.jar，网站我忘了，但我可以提供一下我使用的这个jar包，链接：链接：https://pan.baidu.com/s/1EjSbBfhGyWzTWNynT6lNWA 提取码：vc0h

4.下载了core-3.0.0.jar包，然后引进项目。如何在eclipse新建Java probject中引入jar包，这个我在这里就不详细说明了，请自行百度吧。

开始

1.新建工程项目，引入core-3.0.0.jar包后，新建一个名为BufferedImageLuminanceSource.java类

—Java

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.LuminanceSource;
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;


public class BufferedImageLuminanceSource {

    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;

    public BufferedImageLuminanceSource(BufferedImage image) {
		// TODO Auto-generated constructor stub
	}


	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
        BufferedImageLuminanceSource.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);
        if (needCompress) { // 压缩LOGO
            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();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            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 = BufferedImageLuminanceSource.createImage(content, imgPath,
                needCompress);
        mkdirs(destPath);
        String file = new Random().nextInt(99999999)+".jpg";
        ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
    }

   
    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 {
        BufferedImageLuminanceSource.encode(content, imgPath, destPath, false);
    }

   
    public static void encode(String content, String destPath,
            boolean needCompress) throws Exception {
        BufferedImageLuminanceSource.encode(content, null, destPath, needCompress);
    }

   
    public static void encode(String content, String destPath) throws Exception {
        BufferedImageLuminanceSource.encode(content, null, destPath, false);
    }

   
    public static void encode(String content, String imgPath,
            OutputStream output, boolean needCompress) throws Exception {
        BufferedImage image = BufferedImageLuminanceSource.createImage(content, imgPath,
                needCompress);
        ImageIO.write(image, FORMAT_NAME, output);
    }

   
    public static void encode(String content, OutputStream output)
            throws Exception {
        BufferedImageLuminanceSource.encode(content, null, output, false);
    }

   
    public static String decode(File file) throws Exception {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        Object source = new BufferedImageLuminanceSource(
                image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer((LuminanceSource) 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 BufferedImageLuminanceSource.decode(new File(path));
    }
   
   
    public static void main(String[] args) throws Exception {
        String text = "http://hongkaiqing.cn";
        BufferedImageLuminanceSource.encode(text, "d:/MyWorkDoc/my180.jpg", "d:/MyWorkDoc", true);
    }
   
}

在创建一个命名为：QRCodeUtil.java类

—Java

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.LuminanceSource;
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;


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);
        if (needCompress) { // 压缩LOGO
            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();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            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));
    }

   
    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);
    }

   
    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;
        }
        Object source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer((LuminanceSource) 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));
    }
   
   
    public static void main(String[] args) throws Exception {
        String text = "http://www.hongkaiqing.cn";
        QRCodeUtil.encode(text, "d:/MyWorkDoc", true);
    }
   
}

然后运行QRCodeUtil.java类，就会在你个人pc电脑的d盘MyWorkDoc文件夹下生成一个二维码图片，效果如下：如果你个人pc电脑的d盘目录下没有MyWorkDoc文件夹，程序则会自动帮你生成该文件夹。

最后

其实是QRCodeUtil.java类中这个main方法决定程序在那个文件夹下生成二维码，String text 决定二维码扫描后，显示的内容的

public static void main(String[] args) throws Exception {
        String text = "http://www.hongkaiqing.cn";
        QRCodeUtil.encode(text, "d:/MyWorkDoc", true);
    }

这个项目demo源码存放在GitHub上，链接：https://github.com/hongkq/QR-code

本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。