Java创建属于自己的二维码（完整版）

Posted 2020-11-26 咯咯咯咯哒

1、准备需要的jar包

　　

core-3.0.0.jar  

zxing.jar

下载地址：关注微信公众号 “IT资源分享平台”，或者扫描右上角二维码。自行获取

 

2、把jar包放到项目工程jar目录下（没有的话自己创建一个jar文件夹），选中两个jar包右键选择Build Path下的Add to Build Path。最终结构如下图。

 

 

 3、把下面两个Java文件放到src下

　　　　结构图如下：

　　　　

 

 

　　 BufferedImageLuminanceSource.java

package codeTest;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

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;
    }

    @Override
    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;
    }

    @Override
    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 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);
    }
}

QRCodeUtil.java

  1 package codeTest;
  2 
  3 import java.awt.BasicStroke;
  4 import java.awt.Graphics;
  5 import java.awt.Graphics2D;
  6 import java.awt.Image;
  7 import java.awt.Shape;
  8 import java.awt.geom.RoundRectangle2D;
  9 import java.awt.image.BufferedImage;
 10 import java.io.File;
 11 import java.io.OutputStream;
 12 import java.util.Hashtable;
 13 import java.util.Random;
 14 
 15 import javax.imageio.ImageIO;
 16 
 17 import com.google.zxing.BarcodeFormat;
 18 import com.google.zxing.BinaryBitmap;
 19 import com.google.zxing.DecodeHintType;
 20 import com.google.zxing.EncodeHintType;
 21 import com.google.zxing.MultiFormatReader;
 22 import com.google.zxing.MultiFormatWriter;
 23 import com.google.zxing.Result;
 24 import com.google.zxing.common.BitMatrix;
 25 import com.google.zxing.common.HybridBinarizer;
 26 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 27 
 28 public class QRCodeUtil {
 29     private static final String CHARSET = "utf-8";
 30     private static final String FORMAT_NAME = "JPG";
 31     // 二维码尺寸
 32     private static final int QRCODE_SIZE = 300;
 33     // LOGO宽度
 34     private static final int WIDTH = 60;
 35     // LOGO高度
 36     private static final int HEIGHT = 60;
 37     
 38     private static BufferedImage createImage(String content, String imgPath,
 39             boolean needCompress) throws Exception {
 40         Hashtable hints = new Hashtable();
 41         hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
 42         hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
 43         hints.put(EncodeHintType.MARGIN, 1);
 44         BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
 45                 BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
 46         int width = bitMatrix.getWidth();
 47         int height = bitMatrix.getHeight();
 48         BufferedImage image = new BufferedImage(width, height,
 49                 BufferedImage.TYPE_INT_RGB);
 50         for (int x = 0; x < width; x++) {
 51             for (int y = 0; y < height; y++) {
 52                 image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000
 53                         : 0xFFFFFFFF);
 54             }
 55         }
 56         if (imgPath == null || "".equals(imgPath)) {
 57             return image;
 58         }
 59         // 插入图片
 60         QRCodeUtil.insertImage(image, imgPath, needCompress);
 61         return image;
 62     }
 63     private static void insertImage(BufferedImage source, String imgPath,
 64             boolean needCompress) throws Exception {
 65         File file = new File(imgPath);
 66         if (!file.exists()) {
 67             System.err.println(""+imgPath+"   该文件不存在！");
 68             return;
 69         }
 70         Image src = ImageIO.read(new File(imgPath));
 71         int width = src.getWidth(null);
 72         int height = src.getHeight(null);
 73         if (needCompress) { // 压缩LOGO
 74             if (width > WIDTH) {
 75                 width = WIDTH;
 76             }
 77             if (height > HEIGHT) {
 78                 height = HEIGHT;
 79             }
 80             Image image = src.getScaledInstance(width, height,
 81                     Image.SCALE_SMOOTH);
 82             BufferedImage tag = new BufferedImage(width, height,
 83                     BufferedImage.TYPE_INT_RGB);
 84             Graphics g = tag.getGraphics();
 85             g.drawImage(image, 0, 0, null); // 绘制缩小后的图
 86             g.dispose();
 87             src = image;
 88         }
 89         // 插入LOGO
 90         Graphics2D graph = source.createGraphics();
 91         int x = (QRCODE_SIZE - width) / 2;
 92         int y = (QRCODE_SIZE - height) / 2;
 93         graph.drawImage(src, x, y, width, height, null);
 94         Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
 95         graph.setStroke(new BasicStroke(3f));
 96         graph.draw(shape);
 97         graph.dispose();
 98     }
 99     public static void encode(String content, String imgPath, String destPath,
100             boolean needCompress) throws Exception {
101         BufferedImage image = QRCodeUtil.createImage(content, imgPath,
102                 needCompress);
103         mkdirs(destPath);
104         String file = new Random().nextInt(99999999)+".jpg";
105         ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
106     }
107     public static void mkdirs(String destPath) {
108         File file =new File(destPath);   
109       //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)
110         if (!file.exists() && !file.isDirectory()) {
111             file.mkdirs();
112         }
113     }
114     public static void encode(String content, String imgPath, String destPath)
115             throws Exception {
116         QRCodeUtil.encode(content, imgPath, destPath, false);
117     }
118 
119    
120     public static void encode(String content, String destPath,
121             boolean needCompress) throws Exception {
122         QRCodeUtil.encode(content, null, destPath, needCompress);
123     }
124 
125    
126     public static void encode(String content, String destPath) throws Exception {
127         QRCodeUtil.encode(content, null, destPath, false);
128     }
129 
130    
131     public static void encode(String content, String imgPath,
132             OutputStream output, boolean needCompress) throws Exception {
133         BufferedImage image = QRCodeUtil.createImage(content, imgPath,
134                 needCompress);
135         ImageIO.write(image, FORMAT_NAME, output);
136     }
137 
138    
139     public static void encode(String content, OutputStream output)
140             throws Exception {
141         QRCodeUtil.encode(content, null, output, false);
142     }
143 
144    
145     public static String decode(File file) throws Exception {
146         BufferedImage image;
147         image = ImageIO.read(file);
148         if (image == null) {
149             return null;
150         }
151         BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
152                 image);
153         BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
154         Result result;
155         Hashtable hints = new Hashtable();
156         hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
157         result = new MultiFormatReader().decode(bitmap, hints);
158         String resultStr = result.getText();
159         return resultStr;
160     }
161 
162    
163     public static String decode(String path) throws Exception {
164         return QRCodeUtil.decode(new File(path));
165     }
166     public static void main(String[] args) throws Exception {
167         String text = "http://itcsdr.com/";
168         
169 //        在你盘符下放一个图片 路径：D:/Java-jar/erweima.jpg   生成二维码的路径：D:/Java-jar
170         QRCodeUtil.encode(text, "D:/Java-jar/logo.jpg", "D:/Java-jar", true);
171     }
172 }

最终效果：