Java二维码的制作

二维码现在已经到处都是了，下面是二维码的介绍：
二维码，又称二维条码，二维条形码最早发明于日本，它是用某种特定的几何图形按一定规律在平面（二维方向上）分布的黑白相间的图形记录数据符号信息的，在代码编制上巧妙地利用构成计算机内部逻辑基础的“0”、“1”比特流的概念，使用若干个与二进制相对应的几何形体来表示文字数值信息，通过图象输入设备或光电扫描设备自动识读以实现信息自动处理。它具有条码技术的一些共性：每种码制有其特定的字符集；每个字符占有一定的宽度；具有一定的校验功能等。同时还具有对不同行的信息自动识别功能、及处理图形旋转变化等特点。

制作流程：
1.java这边的话生成二维码有很多开发的jar包如zxing,qrcode.q前者是谷歌开发的后者则是小日本开发的，这里的话我使用zxing的开发包来弄
2.先下载zxing开发包，这里用到的只是core那个jar包

　　下载地址：http://download.csdn.net/download/mobiusstrip/10021893

　　然后将core-3.3.0.jar包放到lib目录下并添加路径；

3.代码：（http://download.csdn.net/download/mobiusstrip/10022089）

 1 package com.lhj.code;
 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,
19             int top, int width, int height) {
20         super(width, height);
21 
22         int sourceWidth = image.getWidth();
23         int sourceHeight = image.getHeight();
24         if (left + width > sourceWidth || top + height > sourceHeight) {
25             throw new IllegalArgumentException(
26                     "Crop rectangle does not fit within image data.");
27         }
28 
29         for (int y = top; y < top + height; y++) {
30             for (int x = left; x < left + width; x++) {
31                 if ((image.getRGB(x, y) & 0xFF000000) == 0) {
32                     image.setRGB(x, y, 0xFFFFFFFF); // = white
33                 }
34             }
35         }
36 
37         this.image = new BufferedImage(sourceWidth, sourceHeight,
38                 BufferedImage.TYPE_BYTE_GRAY);
39         this.image.getGraphics().drawImage(image, 0, 0, null);
40         this.left = left;
41         this.top = top;
42     }
43 
44    
45     public byte[] getRow(int y, byte[] row) {
46         if (y < 0 || y >= getHeight()) {
47             throw new IllegalArgumentException(
48                     "Requested row is outside the image: " + y);
49         }
50         int width = getWidth();
51         if (row == null || row.length < width) {
52             row = new byte[width];
53         }
54         image.getRaster().getDataElements(left, top + y, width, 1, row);
55         return row;
56     }
57 
58    
59     public byte[] getMatrix() {
60         int width = getWidth();
61         int height = getHeight();
62         int area = width * height;
63         byte[] matrix = new byte[area];
64         image.getRaster().getDataElements(left, top, width, height, matrix);
65         return matrix;
66     }
67 
68    
69     public boolean isCropSupported() {
70         return true;
71     }
72 
73    
74     public LuminanceSource crop(int left, int top, int width, int height) {
75         return new BufferedImageLuminanceSource(image, this.left + left,
76                 this.top + top, width, height);
77     }
78 
79    
80     public boolean isRotateSupported() {
81         return true;
82     }
83 
84    
85     public LuminanceSource rotateCounterClockwise() {
86         int sourceWidth = image.getWidth();
87         int sourceHeight = image.getHeight();
88         AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0,
89                 0.0, 0.0, sourceWidth);
90         BufferedImage rotatedImage = new BufferedImage(sourceHeight,
91                 sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
92         Graphics2D g = rotatedImage.createGraphics();
93         g.drawImage(image, transform, null);
94         g.dispose();
95         int width = getWidth();
96         return new BufferedImageLuminanceSource(rotatedImage, top,
97                 sourceWidth - (left + width), getHeight(), width);
98     }
99 }

BufferedImageLuminanceSource

  1 package com.lhj.code;
  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 
 29 public class QRCodeUtil {
 30 
 31     private static final String CHARSET = "utf-8";
 32     private static final String FORMAT_NAME = "JPG";
 33     // 二维码尺寸
 34     private static final int QRCODE_SIZE = 300;
 35     // LOGO宽度
 36     private static final int WIDTH = 60;
 37     // LOGO高度
 38     private static final int HEIGHT = 60;
 39 
 40     private static BufferedImage createImage(String content, String imgPath,
 41             boolean needCompress) throws Exception {
 42         Hashtable hints = new Hashtable();
 43         hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
 44         hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
 45         hints.put(EncodeHintType.MARGIN, 1);
 46         BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
 47                 BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
 48         int width = bitMatrix.getWidth();
 49         int height = bitMatrix.getHeight();
 50         BufferedImage image = new BufferedImage(width, height,
 51                 BufferedImage.TYPE_INT_RGB);
 52         for (int x = 0; x < width; x++) {
 53             for (int y = 0; y < height; y++) {
 54                 image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000
 55                         : 0xFFFFFFFF);
 56             }
 57         }
 58         if (imgPath == null || "".equals(imgPath)) {
 59             return image;
 60         }
 61         // 插入图片
 62         QRCodeUtil.insertImage(image, imgPath, needCompress);
 63         return image;
 64     }
 65 
 66    
 67     private static void insertImage(BufferedImage source, String imgPath,
 68             boolean needCompress) throws Exception {
 69         File file = new File(imgPath);
 70         if (!file.exists()) {
 71             System.err.println(""+imgPath+"   该文件不存在！");
 72             return;
 73         }
 74         Image src = ImageIO.read(new File(imgPath));
 75         int width = src.getWidth(null);
 76         int height = src.getHeight(null);
 77         if (needCompress) { // 压缩LOGO
 78             if (width > WIDTH) {
 79                 width = WIDTH;
 80             }
 81             if (height > HEIGHT) {
 82                 height = HEIGHT;
 83             }
 84             Image image = src.getScaledInstance(width, height,
 85                     Image.SCALE_SMOOTH);
 86             BufferedImage tag = new BufferedImage(width, height,
 87                     BufferedImage.TYPE_INT_RGB);
 88             Graphics g = tag.getGraphics();
 89             g.drawImage(image, 0, 0, null); // 绘制缩小后的图
 90             g.dispose();
 91             src = image;
 92         }
 93         // 插入LOGO
 94         Graphics2D graph = source.createGraphics();
 95         int x = (QRCODE_SIZE - width) / 2;
 96         int y = (QRCODE_SIZE - height) / 2;
 97         graph.drawImage(src, x, y, width, height, null);
 98         Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
 99         graph.setStroke(new BasicStroke(3f));
100         graph.draw(shape);
101         graph.dispose();
102     }
103 
104    
105     public static void encode(String content, String imgPath, String destPath,
106             boolean needCompress) throws Exception {
107         BufferedImage image = QRCodeUtil.createImage(content, imgPath,
108                 needCompress);
109         mkdirs(destPath);
110         String file = new Random().nextInt(99999999)+".jpg";
111         ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
112     }
113 
114    
115     public static void mkdirs(String destPath) {
116         File file =new File(destPath);   
117         //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)
118         if (!file.exists() && !file.isDirectory()) {
119             file.mkdirs();
120         }
121     }
122 
123    
124     public static void encode(String content, String imgPath, String destPath)
125             throws Exception {
126         QRCodeUtil.encode(content, imgPath, destPath, false);
127     }
128 
129    
130     public static void encode(String content, String destPath,
131             boolean needCompress) throws Exception {
132         QRCodeUtil.encode(content, null, destPath, needCompress);
133     }
134 
135    
136     public static void encode(String content, String destPath) throws Exception {
137         QRCodeUtil.encode(content, null, destPath, false);
138     }
139 
140    
141     public static void encode(String content, String imgPath,
142             OutputStream output, boolean needCompress) throws Exception {
143         BufferedImage image = QRCodeUtil.createImage(content, imgPath,
144                 needCompress);
145         ImageIO.write(image, FORMAT_NAME, output);
146     }
147 
148    
149     public static void encode(String content, OutputStream output)
150             throws Exception {
151         QRCodeUtil.encode(content, null, output, false);
152     }
153 
154    
155     public static String decode(File file) throws Exception {
156         BufferedImage image;
157         image = ImageIO.read(file);
158         if (image == null) {
159             return null;
160         }
161         BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
162                 image);
163         BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
164         Result result;
165         Hashtable hints = new Hashtable();
166         hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
167         result = new MultiFormatReader().decode(bitmap, hints);
168         String resultStr = result.getText();
169         return resultStr;
170     }
171 
172    
173     public static String decode(String path) throws Exception {
174         return QRCodeUtil.decode(new File(path));
175     }
176 
177     
178 }

QRCodeUtil

 1 package com.lhj.code;
 2 
 3 /**
 4  * 二维码生成测试类
 5  * @author Cloud
 6  * @data   2016-11-21
 7  * QRCodeTest
 8  */
 9 
10 public class QRCodeTest {
11 
12     public static void main(String[] args) throws Exception {
13         
14         String text = "http://www.cnblogs.com/mmzs/";
15         
16         //不带logo的二维码
17         QRCodeUtil.encode(text, "", "d:/test", true);
18         //参数依次代表：内容；logo地址；二维码输出目录；是否需要压缩图片
19         //QRCodeUtil.encode(text, "d:/test");//参数依次代表：内容；二维码输出目录；
20         
21         //带logo的二维码
22         QRCodeUtil.encode(text, "d:/test/1.jpg", "d:/test", true);
23 
24         
25 
26        System.out.println("success");
27    }
28 }

main

运行结果：Java学习交流QQ群：603654340

success

PS：引用http://blog.sina.com.cn/s/blog_5a6efa330102v1lb.html

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原文地址：https://www.cnblogs.com/mmzs/p/7670024.html