Java实现二维码生成的几个方法

柔情只为你懂 2022-04-14 02:00 451阅读 0赞

# Java实现二维码生成的几个方法 #

1、支持QRcode、ZXing 二维码生成、解析；

2、QRCode 方式生成二维码支持添加图片，如下：

![Center][]![Center 1][]![Center 2][]

1. `package common;`
2.  
3. `import java.awt.Color;`
4. `import java.awt.Graphics2D;`
5. `import java.awt.Image;`
6. `import java.awt.image.BufferedImage;`
7. `import java.io.File;`
8. `import java.io.IOException;`
9. `import java.util.HashMap;`
10. `import java.util.Map;`
11.  
12. `import javax.imageio.ImageIO;`
13.  
14. `import jp.sourceforge.qrcode.QRCodeDecoder;`
15. `import jp.sourceforge.qrcode.exception.DecodingFailedException;`
16.  
17. `import com.google.zxing.BarcodeFormat;`
18. `import com.google.zxing.Binarizer;`
19. `import com.google.zxing.BinaryBitmap;`
20. `import com.google.zxing.EncodeHintType;`
21. `import com.google.zxing.LuminanceSource;`
22. `import com.google.zxing.MultiFormatReader;`
23. `import com.google.zxing.MultiFormatWriter;`
24. `import com.google.zxing.NotFoundException;`
25. `import com.google.zxing.WriterException;`
26. `import com.google.zxing.common.BitMatrix;`
27. `import com.google.zxing.common.HybridBinarizer;`
28. `import com.swetake.util.Qrcode;`
29.  
30. `/**`
31. `* 二维码生成工具类`
32. `* @author Cloud`
33. `* @data 2016-12-15`
34. `* QRCode`
35. `*/`
36.  
37. `public class QRCodeUtil {`
38.  
39. `//二维码颜色`
40. `private static final int BLACK = 0xFF000000;`
41. `//二维码颜色`
42. `private static final int WHITE = 0xFFFFFFFF;`
43.  
44. `/**`
45. `* ZXing 方式生成二维码`
46. `* @param text <a href="javascript:void();">二维码内容</a>`
47. `* @param width 二维码宽`
48. `* @param height 二维码高`
49. `* @param outPutPath 二维码生成保存路径`
50. `* @param imageType 二维码生成格式`
51. `*/`
52. `public static void zxingCodeCreate(String text, int width, int height, String outPutPath, String imageType){`
53. `Map<EncodeHintType, String> his = new HashMap<EncodeHintType, String>();`
54. `//设置编码字符集`
55. `his.put(EncodeHintType.CHARACTER_SET, "utf-8");`
56. `try {`
57. `//1、生成二维码`
58. `BitMatrix encode = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, his);`
59.  
60. `//2、获取二维码宽高`
61. `int codeWidth = encode.getWidth();`
62. `int codeHeight = encode.getHeight();`
63.  
64. `//3、将二维码放入缓冲流`
65. `BufferedImage image = new BufferedImage(codeWidth, codeHeight, BufferedImage.TYPE_INT_RGB);`
66. `for (int i = 0; i < codeWidth; i++) {`
67. `for (int j = 0; j < codeHeight; j++) {`
68. `//4、循环将二维码内容定入图片`
69. `image.setRGB(i, j, encode.get(i, j) ? BLACK : WHITE);`
70. `}`
71. `}`
72. `File outPutImage = new File(outPutPath);`
73. `//如果图片不存在创建图片`
74. `if(!outPutImage.exists())`
75. `outPutImage.createNewFile();`
76. `//5、将二维码写入图片`
77. `ImageIO.write(image, imageType, outPutImage);`
78. `} catch (WriterException e) {`
79. `e.printStackTrace();`
80. `System.out.println("二维码生成失败");`
81. `} catch (IOException e) {`
82. `e.printStackTrace();`
83. `System.out.println("生成二维码图片失败");`
84. `}`
85. `}`
86.  
87. `/**`
88. `* 二维码解析`
89. `* @param analyzePath 二维码路径`
90. `* @return`
91. `* @throws IOException`
92. `*/`
93. `@SuppressWarnings({ "rawtypes", "unchecked" })`
94. `public static Object zxingCodeAnalyze(String analyzePath) throws Exception{`
95. `MultiFormatReader formatReader = new MultiFormatReader();`
96. `Object result = null;`
97. `try {`
98. `File file = new File(analyzePath);`
99. `if (!file.exists())`
100. `{`
101. `return "二维码不存在";`
102. `}`
103. `BufferedImage image = ImageIO.read(file);`
104. `LuminanceSource source = new LuminanceSourceUtil(image);`
105. `Binarizer binarizer = new HybridBinarizer(source);`
106. `BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);`
107. `Map hints = new HashMap();`
108. `hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");`
109. `result = formatReader.decode(binaryBitmap, hints);`
110. `} catch (NotFoundException e) {`
111. `e.printStackTrace();`
112. `}`
113. `return result;`
114. `}`
115.  
116. `/**`
117. `* QRCode 方式生成二维码`
118. `* @param content 二维码内容`
119. `* @param imgPath 二维码生成路径`
120. `* @param version 二维码版本`
121. `* @param isFlag 是否生成Logo图片 为NULL不生成`
122. `*/`
123. `public static void QRCodeCreate(String content, String imgPath, int version, String logoPath){`
124. `try {`
125. `Qrcode qrcodeHandler = new Qrcode();`
126. `//设置二维码排错率，可选L(7%) M(15%) Q(25%) H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小`
127. `qrcodeHandler.setQrcodeErrorCorrect('M');`
128. `//N代表数字,A代表字符a-Z,B代表其他字符`
129. `qrcodeHandler.setQrcodeEncodeMode('B');`
130. `//版本1为21*21矩阵，版本每增1，二维码的两个边长都增4；所以版本7为45*45的矩阵；最高版本为是40，是177*177的矩阵`
131. `qrcodeHandler.setQrcodeVersion(version);`
132. `//根据版本计算尺寸`
133. `int imgSize = 67 + 12 * (version - 1) ;`
134. `byte[] contentBytes = content.getBytes("gb2312");`
135. `BufferedImage bufImg = new BufferedImage(imgSize , imgSize ,BufferedImage.TYPE_INT_RGB);`
136. `Graphics2D gs = bufImg.createGraphics();`
137. `gs.setBackground(Color.WHITE);`
138. `gs.clearRect(0, 0, imgSize , imgSize);`
139. `// 设定图像颜色 > BLACK`
140. `gs.setColor(Color.BLACK);`
141. `// 设置偏移量 不设置可能导致解析出错`
142. `int pixoff = 2;`
143. `// 输出内容 > 二维码`
144. `if (contentBytes.length > 0 && contentBytes.length < 130) {`
145. `boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);`
146. `for (int i = 0; i < codeOut.length; i++) {`
147. `for (int j = 0; j < codeOut.length; j++) {`
148. `if (codeOut[j][i]) {`
149. `gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);`
150. `}`
151. `}`
152. `}`
153. `} else {`
154. `System.err.println("QRCode content bytes length = " + contentBytes.length + " not in [ 0,130 ]. ");`
155. `}`
156. `/* 判断是否需要添加logo图片 */`
157. `if(logoPath != null){`
158. `File icon = new File(logoPath);`
159. `if(icon.exists()){`
160. `int width_4 = imgSize / 4;`
161. `int width_8 = width_4 / 2;`
162. `int height_4 = imgSize / 4;`
163. `int height_8 = height_4 / 2;`
164. `Image img = ImageIO.read(icon);`
165. `gs.drawImage(img, width_4 + width_8, height_4 + height_8,width_4,height_4, null);`
166. `gs.dispose();`
167. `bufImg.flush();`
168. `}else{`
169. `System.out.println("Error: login图片不存在！");`
170. `}`
171.  
172. `}`
173.  
174.  
175. `gs.dispose();`
176. `bufImg.flush();`
177. `//创建二维码文件`
178. `File imgFile = new File(imgPath);`
179. `if(!imgFile.exists())`
180. `imgFile.createNewFile();`
181. `//根据生成图片获取图片`
182. `String imgType = imgPath.substring(imgPath.lastIndexOf(".") + 1, imgPath.length());`
183. `// 生成二维码QRCode图片`
184. `ImageIO.write(bufImg, imgType, imgFile);`
185. `} catch (Exception e) {`
186. `e.printStackTrace();`
187. `}`
188. `}`
189.  
190. `/**`
191. `* QRCode二维码解析`
192. `* @param codePath 二维码路径`
193. `* @return 解析结果`
194. `*/`
195. `public static String QRCodeAnalyze(String codePath) {`
196. `File imageFile = new File(codePath);`
197. `BufferedImage bufImg = null;`
198. `String decodedData = null;`
199. `try {`
200. `if(!imageFile.exists())`
201. `return "二维码不存在";`
202. `bufImg = ImageIO.read(imageFile);`
203.  
204. `QRCodeDecoder decoder = new QRCodeDecoder();`
205. `decodedData = new String(decoder.decode(new ImageUtil(bufImg)), "gb2312");`
206. `} catch (IOException e) {`
207. `System.out.println("Error: " + e.getMessage());`
208. `e.printStackTrace();`
209. `} catch (DecodingFailedException dfe) {`
210. `System.out.println("Error: " + dfe.getMessage());`
211. `dfe.printStackTrace();`
212. `}`
213. `return decodedData;`
214. `}`
215.  
216. `}`
217.  
218.  
219. `3、最后贴测试代码：`
220.  
221. `package test;`
222.  
223. `import java.awt.image.BufferedImage;`
224. `import java.io.InputStream;`
225. `import java.net.URL;`
226.  
227. `import javax.imageio.ImageIO;`
228.  
229. `import common.ImageUtil;`
230. `import common.QRCodeUtil;`
231.  
232. `import jp.sourceforge.qrcode.QRCodeDecoder;`
233.  
234. `/**`
235. `* 二维码生成测试类`
236. `* @author Cloud`
237. `* @data 2016-11-21`
238. `* QRCodeTest`
239. `*/`
240.  
241. `public class QRCodeTest {`
242.  
243. `public static void main(String[] args) throws Exception {`
244. `/**`
245. `* QRcode 二维码生成测试`
246. `* QRCodeUtil.QRCodeCreate("http://blog.csdn.net/u014266877", "E://qrcode.jpg", 15, "E://icon.png");`
247. `*/`
248. `/**`
249. `* QRcode 二维码解析测试`
250. `* String qrcodeAnalyze = QRCodeUtil.QRCodeAnalyze("E://qrcode.jpg");`
251. `*/`
252. `/**`
253. `* ZXingCode 二维码生成测试`
254. `* QRCodeUtil.zxingCodeCreate("http://blog.csdn.net/u014266877", 300, 300, "E://zxingcode.jpg", "jpg");`
255. `*/`
256. `/**`
257. `* ZxingCode 二维码解析`
258. `* String zxingAnalyze = QRCodeUtil.zxingCodeAnalyze("E://zxingcode.jpg").toString();`
259. `*/`
260. `System.out.println("success");`
261. `}`
262. `}`

[Center]: https://img-blog.csdn.net/20161215101002824?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxNDI2Njg3Nw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://img-blog.csdn.net/20161215103621990?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxNDI2Njg3Nw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 2]: /images/20220414/39927aa8ef9c435b92e89c6dacb85e0f.png