本文详细介绍两种生成二维码的方法，包括直接生成二维码图片及在二维码中插入个性化Logo。第一种方法使用Google ZXing库，通过指定网址生成二维码；第二种方法进一步增强功能，允许在二维码中嵌入图片Logo，提供更丰富的定制选项。
下面我来分享两种生成二维码图片的方法。
第一种，填入你扫描二维码要跳转的网址直接生成二维码
第一步：导入相关的包
1 <dependency> 2 <groupId>com.google.zxing</groupId> 3 <artifactId>core</artifactId> 4 <version>3.3.3</version> 5 </dependency>
第二步：配置图像写入器类
1 package com.easycare.util.twocode;
2
3 import java.awt.image.BufferedImage;
4 import java.io.File;
5 import java.io.IOException;
6
7 import javax.imageio.ImageIO;
8
9 import com.google.zxing.common.BitMatrix;
10
11 /**
12 * 配置图像写入器
13 *
14 * @author 18316
15 *
16 */
17 public class MatrixToImageWriter {
18 private static final int BLACK = 0xFF000000;
19 private static final int WHITE = 0xFFFFFFFF;
20
21 private MatrixToImageWriter() {
22 }
23
24 public static BufferedImage toBufferedImage(BitMatrix matrix) {
25 int width = matrix.getWidth();
26 int height = matrix.getHeight();
27 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
28 for (int x = 0; x < width; x++) {
29 for (int y = 0; y < height; y++) {
30 image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
31 }
32 }
33 return image;
34 }
35
36 public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
37 BufferedImage image = toBufferedImage(matrix);
38 if (!ImageIO.write(image, format, file)) {
39 throw new IOException("Could not write an image of format " + format + " to " + file);
40 }
41 }
42
43 }
第三步：测试类
package com.easycare.util.twocode;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
public class MyTest {
public static void main(String[] args) {
System.out.println("开始生成...");
code();
System.out.println("生成完毕！");
}
public static void code() {
try {
String content = "https://www.baidu.com";
String path = "G:/测试";// 二维码保存的路径
String codeName = UUID.randomUUID().toString();// 二维码的图片名
String imageType = "jpg";// 图片类型
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
Map<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints);
File file1 = new File(path, codeName + "." + imageType);
MatrixToImageWriter.writeToFile(bitMatrix, imageType, file1);
} catch (WriterException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
好了第一种二维码生成功能写好了，点击运行测试类，下面给出效果图，因为我的代码写的是二维码保存在G:/测试，所以到G盘中找到图片
扫描之后就能跳转到我写入的百度地址。
第二种生成二维码的方法，这种相比上一种能在生成的二维码中插入个性logo
第一步：导入相关的包
1 <dependency> 2 <groupId>com.google.zxing</groupId> 3 <artifactId>core</artifactId> 4 <version>3.3.3</version> 5 </dependency>
第二步：继承LuminanceSource类
1 package com.easycare.util.imagecode;
2
3 import java.awt.Graphics2D;
4 import java.awt.geom.AffineTransform;
5 import java.awt.image.BufferedImage;
6
7 import com.google.zxing.LuminanceSource;
8
9 public class BufferedImageLuminanceSource extends LuminanceSource {
10 private final BufferedImage image;
11 private final int left;
12 private final int top;
13
14 public BufferedImageLuminanceSource(BufferedImage image) {
15 this(image, 0, 0, image.getWidth(), image.getHeight());
16 }
17
18 public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
19 super(width, height);
20 int sourceWidth = image.getWidth();
21 int sourceHeight = image.getHeight();
22 if (left + width > sourceWidth || top + height > sourceHeight) {
23 throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
24 }
25 for (int y = top; y < top + height; y++) {
26 for (int x = left; x < left + width; x++) {
27 if ((image.getRGB(x, y) & 0xFF000000) == 0) {
28 image.setRGB(x, y, 0xFFFFFFFF); // = white
29 }
30 }
31 }
32 this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
33 this.image.getGraphics().drawImage(image, 0, 0, null);
34 this.left = left;
35 this.top = top;
36 }
37
38 @Override
39 public byte[] getRow(int y, byte[] row) {
40 if (y < 0 || y >= getHeight()) {
41 throw new IllegalArgumentException("Requested row is outside the image: " + y);
42 }
43 int width = getWidth();
44 if (row == null || row.length < width) {
45 row = new byte[width];
46 }
47 image.getRaster().getDataElements(left, top + y, width, 1, row);
48 return row;
49 }
50
51 @Override
52 public byte[] getMatrix() {
53 int width = getWidth();
54 int height = getHeight();
55 int area = width * height;
56 byte[] matrix = new byte[area];
57 image.getRaster().getDataElements(left, top, width, height, matrix);
58 return matrix;
59 }
60
61 @Override
62 public boolean isCropSupported() {
63 return true;
64 }
65
66 @Override
67 public LuminanceSource crop(int left, int top, int width, int height) {
68 return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
69 }
70
71 @Override
72 public boolean isRotateSupported() {
73 return true;
74 }
75
76 @Override
77 public LuminanceSource rotateCounterClockwise() {
78 int sourceWidth = image.getWidth();
79 int sourceHeight = image.getHeight();
80 AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
81 BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
82 Graphics2D g = rotatedImage.createGraphics();
83 g.drawImage(image, transform, null);
84 g.dispose();
85 int width = getWidth();
86 return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
87 }
88 }
第三步：配置图像写入器类
package com.easycare.util.imagecode;
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.util.Hashtable;
import java.util.UUID;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 二维码生成类
*
* @author 18316
*
*/
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 = 100;
// LOGO高度
private static final int HEIGHT = 100;
private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
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;
}
/**
* 插入LOGO
*
* @param source 二维码图片
* @param imgPath LOGO图片地址
* @param needCompress 是否压缩
* @throws Exception
*/
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();
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content 内容
* @param imgPath LOGO地址
* @param destPath 存放目录
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static String encode(String content, String imgPath, String destPath, boolean needCompress)
throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
mkdirs(destPath);
// 随机生成二维码图片文件名
String file = UUID.randomUUID() + ".jpg";
ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
return destPath + file;
}
/**
* 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)
*
* @author lanyuan Email: mmm333zzz520@163.com
* @date 2013-12-11 上午10:16:36
* @param destPath 存放目录
*/
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();
}
}
}
运行测试了，效果图
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