Java语言实现二维码的生成

众所周知，现在生活中二维码已经是无处不见。走在街道上，随处可见广告标语旁有二维码，手机上QQ，微信加个好友都能通过二维码的方式，我不知道是什么时候兴起的二维码浪潮，但是我知道，这在我小时候可是见不到的。小小的一个方形图片，却能存储着大量的信息，是不是不可思议。当然路边的二维码希望大家还是不要贪小便宜，随便扫二维码很可能给你手机内置了病毒，导致个人信息的泄露，切记切记！

话不多说，直接上代码。

生成带logo的二维码代码：

  1 package com.lsd.barcode;
  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 import javax.imageio.ImageIO;
 15 import com.google.zxing.BarcodeFormat;
 16 import com.google.zxing.BinaryBitmap;
 17 import com.google.zxing.DecodeHintType;
 18 import com.google.zxing.EncodeHintType;
 19 import com.google.zxing.MultiFormatReader;
 20 import com.google.zxing.MultiFormatWriter;
 21 import com.google.zxing.Result;
 22 import com.google.zxing.common.BitMatrix;
 23 import com.google.zxing.common.HybridBinarizer;
 24 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 25 
 26 /**
 27  * 二维码工具类
 28  * 
 29  */
 30 public class QRCodeUtil {
 31 
 32     private static final String CHARSET = "utf-8";
 33     private static final String FORMAT_NAME = "JPG";
 34     // 二维码尺寸
 35     private static final int QRCODE_SIZE = 300;
 36     // LOGO宽度
 37     private static final int WIDTH = 60;
 38     // LOGO高度
 39     private static final int HEIGHT = 60;
 40 
 41     private static BufferedImage createImage(String content, String imgPath,
 42             boolean needCompress) throws Exception {
 43         Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
 44         hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
 45         hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
 46         hints.put(EncodeHintType.MARGIN, 1);
 47         BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
 48                 BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
 49         int width = bitMatrix.getWidth();
 50         int height = bitMatrix.getHeight();
 51         BufferedImage image = new BufferedImage(width, height,
 52                 BufferedImage.TYPE_INT_RGB);
 53         for (int x = 0; x < width; x++) {
 54             for (int y = 0; y < height; y++) {
 55                 image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000
 56                         : 0xFFFFFFFF);
 57             }
 58         }
 59         if (imgPath == null || "".equals(imgPath)) {
 60             return image;
 61         }
 62         // 插入图片
 63         QRCodeUtil.insertImage(image, imgPath, needCompress);
 64         return image;
 65     }
 66 
 67     /**
 68      * 插入LOGO
 69      * 
 70      * @param source
 71      *            二维码图片
 72      * @param imgPath
 73      *            LOGO图片地址
 74      * @param needCompress
 75      *            是否压缩
 76      * @throws Exception
 77      */
 78     private static void insertImage(BufferedImage source, String imgPath,
 79             boolean needCompress) throws Exception {
 80         File file = new File(imgPath);
 81         if (!file.exists()) {
 82             System.err.println(""+imgPath+"   该文件不存在！");
 83             return;
 84         }
 85         Image src = ImageIO.read(new File(imgPath));
 86         int width = src.getWidth(null);
 87         int height = src.getHeight(null);
 88         if (needCompress) { // 压缩LOGO
 89             if (width > WIDTH) {
 90                 width = WIDTH;
 91             }
 92             if (height > HEIGHT) {
 93                 height = HEIGHT;
 94             }
 95             Image image = src.getScaledInstance(width, height,
 96                     Image.SCALE_SMOOTH);
 97             BufferedImage tag = new BufferedImage(width, height,
 98                     BufferedImage.TYPE_INT_RGB);
 99             Graphics g = tag.getGraphics();
100             g.drawImage(image, 0, 0, null); // 绘制缩小后的图
101             g.dispose();
102             src = image;
103         }
104         // 插入LOGO
105         Graphics2D graph = source.createGraphics();
106         int x = (QRCODE_SIZE - width) / 2;
107         int y = (QRCODE_SIZE - height) / 2;
108         graph.drawImage(src, x, y, width, height, null);
109         Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
110         graph.setStroke(new BasicStroke(3f));
111         graph.draw(shape);
112         graph.dispose();
113     }
114 
115     /**
116      * 生成二维码(内嵌LOGO)
117      * 
118      * @param content
119      *            内容
120      * @param imgPath
121      *            LOGO地址
122      * @param destPath
123      *            存放目录
124      * @param needCompress
125      *            是否压缩LOGO
126      * @throws Exception
127      */
128     public static void encode(String content, String imgPath, String destPath,
129             boolean needCompress) throws Exception {
130         BufferedImage image = QRCodeUtil.createImage(content, imgPath,
131                 needCompress);
132         mkdirs(destPath);
133         String file = new Random().nextInt(99999999)+".jpg";
134         ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
135     }
136 
137     /**
138      * 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)
139      * @param destPath 存放目录
140      */
141     public static void mkdirs(String destPath) {
142         File file =new File(destPath);    
143         //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)
144         if (!file.exists() && !file.isDirectory()) {
145             file.mkdirs();
146         }
147     }
148 
149     /**
150      * 生成二维码(内嵌LOGO)
151      * 
152      * @param content
153      *            内容
154      * @param imgPath
155      *            LOGO地址
156      * @param destPath
157      *            存储地址
158      * @throws Exception
159      */
160     public static void encode(String content, String imgPath, String destPath)
161             throws Exception {
162         QRCodeUtil.encode(content, imgPath, destPath, false);
163     }
164 
165     /**
166      * 生成二维码
167      * 
168      * @param content
169      *            内容
170      * @param destPath
171      *            存储地址
172      * @param needCompress
173      *            是否压缩LOGO
174      * @throws Exception
175      */
176     public static void encode(String content, String destPath,
177             boolean needCompress) throws Exception {
178         QRCodeUtil.encode(content, null, destPath, needCompress);
179     }
180 
181     /**
182      * 生成二维码
183      * 
184      * @param content
185      *            内容
186      * @param destPath
187      *            存储地址
188      * @throws Exception
189      */
190     public static void encode(String content, String destPath) throws Exception {
191         QRCodeUtil.encode(content, null, destPath, false);
192     }
193 
194     /**
195      * 生成二维码(内嵌LOGO)
196      * 
197      * @param content
198      *            内容
199      * @param imgPath
200      *            LOGO地址
201      * @param output
202      *            输出流
203      * @param needCompress
204      *            是否压缩LOGO
205      * @throws Exception
206      */
207     public static void encode(String content, String imgPath,
208             OutputStream output, boolean needCompress) throws Exception {
209         BufferedImage image = QRCodeUtil.createImage(content, imgPath,
210                 needCompress);
211         ImageIO.write(image, FORMAT_NAME, output);
212     }
213 
214     /**
215      * 生成二维码
216      * 
217      * @param content
218      *            内容
219      * @param output
220      *            输出流
221      * @throws Exception
222      */
223     public static void encode(String content, OutputStream output)
224             throws Exception {
225         QRCodeUtil.encode(content, null, output, false);
226     }
227 
228     /**
229      * 解析二维码
230      * 
231      * @param file
232      *            二维码图片
233      * @return
234      * @throws Exception
235      */
236     public static String decode(File file) throws Exception {
237         BufferedImage image;
238         image = ImageIO.read(file);
239         if (image == null) {
240             return null;
241         }
242         BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
243                 image);
244         BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
245         Result result;
246         Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
247         hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
248         result = new MultiFormatReader().decode(bitmap, hints);
249         String resultStr = result.getText();
250         return resultStr;
251     }
252 
253     /**
254      * 解析二维码
255      * 
256      * @param path
257      *            二维码图片地址
258      * @return
259      * @throws Exception
260      */
261     public static String decode(String path) throws Exception {
262         return QRCodeUtil.decode(new File(path));
263     }
264 
265     public static void createCode(String text,String picturepath,String location) throws Exception {
266         QRCodeUtil.encode(text, picturepath, location, true);
267     }
268 }
View Code
package com.lsd.barcode;


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;
    }

    
    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);
    }
}
View Code

分别保存在两个java类文件中，然后打成jar包，直接调用包中的createCode方法即可，参数别分为二维码内容，图片路径，存放地址，图片是否需要压缩。

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原文地址：https://www.cnblogs.com/timePasser-leoli/p/7345823.html