Java创建属于自己的二维码（完整版）
1、准备需要的jar包
core-3.0.0.jarzxing.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：
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