1、jar包： ZXing-core-3.3.0.jar http://mvnrepository.com/artifact/com.google.zxing/core
ZXing-javase-3.3.0.jar http://mvnrepository.com/artifact/com.google.zxing/javase
BufferedImageLuminanceSource.java
1 package com.webos.util;
2 import java.awt.Graphics2D;
3 import java.awt.geom.AffineTransform;
4 import java.awt.image.BufferedImage;
5
6 import com.google.zxing.LuminanceSource;
7
8 public class BufferedImageLuminanceSource extends LuminanceSource {
9 private final BufferedImage image;
10 private final int left;
11 private final int top;
12
13 public BufferedImageLuminanceSource(BufferedImage image) {
14 this(image, 0, 0, image.getWidth(), image.getHeight());
15 }
16
17 public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
18 super(width, height);
19
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
26 for (int y = top; y < top + height; y++) {
27 for (int x = left; x < left + width; x++) {
28 if ((image.getRGB(x, y) & 0xFF000000) == 0) {
29 image.setRGB(x, y, 0xFFFFFFFF); // = white
30 }
31 }
32 }
33
34 this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
35 this.image.getGraphics().drawImage(image, 0, 0, null);
36 this.left = left;
37 this.top = top;
38 }
39
40 public byte[] getRow(int y, byte[] row) {
41 if (y < 0 || y >= getHeight()) {
42 throw new IllegalArgumentException("Requested row is outside the image: " + y);
43 }
44 int width = getWidth();
45 if (row == null || row.length < width) {
46 row = new byte[width];
47 }
48 image.getRaster().getDataElements(left, top + y, width, 1, row);
49 return row;
50 }
51
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 public boolean isCropSupported() {
62 return true;
63 }
64
65 public LuminanceSource crop(int left, int top, int width, int height) {
66 return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
67 }
68
69 public boolean isRotateSupported() {
70 return true;
71 }
72
73 public LuminanceSource rotateCounterClockwise() {
74 int sourceWidth = image.getWidth();
75 int sourceHeight = image.getHeight();
76 AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
77 BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
78 Graphics2D g = rotatedImage.createGraphics();
79 g.drawImage(image, transform, null);
80 g.dispose();
81 int width = getWidth();
82 return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
83 }
84 }
QRCodeUtil.java
1 package com.webos.util;
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.common.BitMatrix;
24 import com.google.zxing.common.HybridBinarizer;
25 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
26
27 /**
28 * @ClassName: QRCodeUtil
29 * @Description: 二維碼編碼
30 * @author Liuy
31 * @date 2016年7月9日 下午3:03:24
32 *
33 */
34 public class QRCodeUtil {
35 // 設置二維碼編碼格式
36 private static final String CHARSET = "utf-8";
37 // 保存的二維碼格式
38 private static final String FORMAT_NAME = "JPG";
39 // 二維碼尺寸
40 private static final int QRCODE_SIZE = 800;
41 // LOGO寬度
42 private static final int LOGO_WIDTH = 80;
43 // LOGO高度
44 private static final int LOGO_HEIGHT = 80;
45
46 /**
47 * @Title: createImage
48 * @Description: 將二維碼內容創建到Image流
49 * @param content 二維碼內容
50 * @param imgPath logo圖片地址
51 * @param needCompress 是否壓縮logo圖片大小
52 * @return
53 * @throws Exception 參數說明
54 * @return BufferedImage 返回類型
55 * @throws
56 */
57 private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
58 Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
59 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
60 hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
61 hints.put(EncodeHintType.MARGIN, 1);
62 BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
63 int width = bitMatrix.getWidth();
64 int height = bitMatrix.getHeight();
65 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
66 for (int x = 0; x < width; x++) {
67 for (int y = 0; y < height; y++) {
68 image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
69 }
70 }
71 if (logoPath == null || "".equals(logoPath)) {
72 return image;
73 }
74 // 插入logo
75 QRCodeUtil.insertImage(image, logoPath, needCompress);
76 return image;
77 }
78
79 /**
80 * @Title: insertImage
81 * @Description: 將logo插入到二維碼中
82 * @param source 二維碼Image流
83 * @param imgPath logo地址
84 * @param needCompress 是否壓縮大小
85 * @throws Exception 參數說明
86 * @return void 返回類型
87 * @throws
88 */
89 private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {
90 File file = new File(logoPath);
91 if (!file.exists()) {
92 System.err.println("" + logoPath + " 該文件不存在！");
93 return;
94 }
95 Image src = ImageIO.read(new File(logoPath));
96 int width = src.getWidth(null);
97 int height = src.getHeight(null);
98 if (needCompress) { // 壓縮LOGO
99 if (width > LOGO_WIDTH) {
100 width = LOGO_WIDTH;
101 }
102 if (height > LOGO_HEIGHT) {
103 height = LOGO_HEIGHT;
104 }
105 Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
106 BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
107 Graphics g = tag.getGraphics();
108 g.drawImage(image, 0, 0, null); // 繪制縮小後的圖
109 g.dispose();
110 src = image;
111 }
112 // 插入LOGO
113 Graphics2D graph = source.createGraphics();
114 int x = (QRCODE_SIZE - width) / 2;
115 int y = (QRCODE_SIZE - height) / 2;
116 graph.drawImage(src, x, y, width, height, null);
117 Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
118 graph.setStroke(new BasicStroke(3f));
119 graph.draw(shape);
120 graph.dispose();
121 }
122
123 /**
124 * @Title: mkdirs
125 * @Description: 創建文件夾
126 * @param destPath 文件夾地址
127 * @return void 返回類型
128 * @throws
129 */
130 private static boolean mkdirs(String destPath) {
131 File file = new File(destPath);
132 // 當文件夾不存在時，mkdirs會自動創建多層目錄，區別於mkdir．(mkdir如果父目錄不存在則會拋出異常)
133 if (!file.exists() && !file.isDirectory()) {
134 file.mkdirs();
135 return true;
136 }
137
138 return false;
139 }
140
141 /**
142 * @Title: encode
143 * @Description: 生成二維碼
144 * @param content 二維碼內容
145 * @param imgPath logo圖片地址
146 * @param destPath 目標保存地址
147 * @param needCompress 是否壓縮logo圖片大小
148 * @throws Exception 參數說明
149 * @return void 返回類型
150 * @throws
151 */
152 private static void encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {
153 BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
154 if (mkdirs(destPath)) {
155 String file = new Random().nextInt(99999999) + ".jpg";
156 ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
157 }
158 }
159
160 /**
161 * @Title: encode
162 * @Description: 生成二維碼
163 * @param content 二維碼內容
164 * @param destPath 目標保存地址
165 * @throws Exception 參數說明
166 * @return void 返回類型
167 * @throws
168 */
169 public static void encode(String content, String destPath) throws Exception {
170 QRCodeUtil.encode(content, null, destPath, false);
171 }
172
173 /**
174 * @Title: encode
175 * @Description: 生成二維碼
176 * @param content 二維碼內容
177 * @param imgPath logo圖片地址
178 * @param output 輸出流
179 * @param needCompress 是否壓縮logo圖片大小
180 * @throws Exception 參數說明
181 * @return void 返回類型
182 * @throws
183 */
184 public static void encode(String content, String logoPath, OutputStream output, boolean needCompress) throws Exception {
185 BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
186 ImageIO.write(image, FORMAT_NAME, output);
187 }
188
189 /**
190 * @Title: encode
191 * @Description: 生成二維碼
192 * @param content 二維碼內容
193 * @param output 輸出流
194 * @throws Exception 參數說明
195 * @return void 返回類型
196 * @throws
197 */
198 public static void encode(String content, OutputStream output) throws Exception {
199 QRCodeUtil.encode(content, null, output, false);
200 }
201
202 /**
203 * @Title: decode
204 * @Description: 對二維碼解碼
205 * @param file 文件對象
206 * @return 解碼後的二維碼內容字符串
207 * @throws Exception 參數說明
208 * @return String 返回類型
209 * @throws
210 */
211 private static String decode(File file) throws Exception {
212 BufferedImage image;
213 image = ImageIO.read(file);
214 if (image == null) {
215 return null;
216 }
217 BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
218 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
219 Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();
220 hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
221 return new MultiFormatReader().decode(bitmap, hints).getText();
222 }
223
224 /**
225 * @Title: decode
226 * @Description: 對二維碼解碼
227 * @param path 文件路徑
228 * @return
229 * @throws Exception 參數說明
230 * @return String 返回類型
231 * @throws
232 */
233 public static String decode(String path) throws Exception {
234 return QRCodeUtil.decode(new File(path));
235 }
236 }
QRCodeServlet.java
1 package com.webos.servlet;
2
3 import java.io.IOException;
4
5 import javax.servlet.ServletException;
6 import javax.servlet.annotation.WebServlet;
7 import javax.servlet.http.HttpServlet;
8 import javax.servlet.http.HttpServletRequest;
9 import javax.servlet.http.HttpServletResponse;
10
11 import com.webos.util.QRCodeUtil;
12
13
14 /*
15 * Servlet implementation class QRCodeServlet
16 */
17 @WebServlet("/QRCodeServlet")
18 public class QRCodeServlet extends HttpServlet {
19 private static final long serialVersionUID = 1L;
20
21 /*
22 * @see HttpServlet#HttpServlet()
23 */
24 public QRCodeServlet() {
25 super();
26 }
27
28 /*
29 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
30 * response)
31 */
32 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
33 try {
34 String text = "http://www.baidu.com?timestamp=" + System.currentTimeMillis();
35 QRCodeUtil.encode(text, response.getOutputStream());
36 } catch (Exception e) {
37 e.printStackTrace();
38 }
39 }
40
41 /*
42 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
43 * response)
44 */
45 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
46 // TODO Auto-generated method stub
47 doGet(request, response);
48 }
49
50 }
