java 二维码
Posted 蒂其之死
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了java 二维码相关的知识，希望对你有一定的参考价值。
在http://www.ostools.net/qr看到了一个生成二维码的工具，于是就产生了一个想法：
为什么自己不做一个二维码的生成和解析工具呢？花了一个多钟的时间，嘿嘿，就做出来啦...
先来看看效果图吧：
CODE_QR:
CODE_128: 
PDF_417:
二维码的意思是：
下面是操作步骤：
一：下载zxing的压缩包：
可以到这里下载：http://code.google.com/p/zxing/downloads/list
ZXing-2.1.zip：http://code.google.com/p/zxing/downloads/detail?name=ZXing-2.1.zip&can=2&q=
得到：
zxing-2.1\\core\\core.jar
zxing-2.1\\javase\\javase.jar
二：把他添加进入你的项目的里面：
/QRCodes/src/com/b510/qrcode/QRCode.java
1 /**
2 *
3 */
4 package com.b510.qrcode;
5
6 import java.awt.image.BufferedImage;
7 import java.io.File;
8 import java.io.IOException;
9 import java.util.Hashtable;
10 import java.util.Map;
11
12 import javax.imageio.ImageIO;
13
14 import com.google.zxing.BarcodeFormat;
15 import com.google.zxing.BinaryBitmap;
16 import com.google.zxing.DecodeHintType;
17 import com.google.zxing.EncodeHintType;
18 import com.google.zxing.LuminanceSource;
19 import com.google.zxing.MultiFormatReader;
20 import com.google.zxing.MultiFormatWriter;
21 import com.google.zxing.ReaderException;
22 import com.google.zxing.Result;
23 import com.google.zxing.Writer;
24 import com.google.zxing.WriterException;
25 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
26 import com.google.zxing.common.BitMatrix;
27 import com.google.zxing.common.HybridBinarizer;
28 import com.google.zxing.oned.CodaBarWriter;
29 import com.google.zxing.oned.Code128Writer;
30 import com.google.zxing.oned.Code39Writer;
31 import com.google.zxing.oned.EAN13Writer;
32 import com.google.zxing.oned.EAN8Writer;
33 import com.google.zxing.oned.ITFWriter;
34 import com.google.zxing.oned.UPCAWriter;
35 import com.google.zxing.pdf417.encoder.PDF417Writer;
36 import com.google.zxing.qrcode.QRCodeWriter;
37
38 /**
39 * 利用zxing开源工具生成二维码QRCode
40 *
41 * @date 2012-10-26
42 * @author xhw
43 *
44 */
45 public class QRCode {
46 private static final int BLACK = 0xff000000;
47 private static final int WHITE = 0xFFFFFFFF;
48
49 /**
50 * @param args
51 */
52 public static void main(String[] args) {
53 QRCode test = new QRCode();
54 File file = new File("C://test.png");
55 /**
56 * 在com.google.zxing.MultiFormatWriter类中，定义了一些我们不知道的码,二维码只是其中的一种<br>
57 * public BitMatrix encode(String contents,
58 BarcodeFormat format,
59 int width, int height,
60 Map<EncodeHintType,?> hints) throws WriterException {
61 Writer writer;
62 switch (format) {
63 case EAN_8:
64 writer = new EAN8Writer();
65 break;
66 case EAN_13:
67 writer = new EAN13Writer();
68 break;
69 case UPC_A:
70 writer = new UPCAWriter();
71 break;
72 case QR_CODE: //这里是二维码
73 writer = new QRCodeWriter();
74 break;
75 case CODE_39:
76 writer = new Code39Writer();
77 break;
78 case CODE_128: //这个可以生成
79 writer = new Code128Writer();
80 break;
81 case ITF:
82 writer = new ITFWriter();
83 break;
84 case PDF_417: //这个可以生成
85 writer = new PDF417Writer();
86 break;
87 case CODABAR:
88 writer = new CodaBarWriter();
89 break;
90 default:
91 throw new IllegalArgumentException("No encoder available for format " + format);
92 }
93 return writer.encode(contents, format, width, height, hints);
94 }
95
96 */
97 test.encode("helloworld,I\'m Hongten.welcome to my zone:http://www.cnblogs.com/hongten", file, BarcodeFormat.QR_CODE, 200, 200, null);
98 test.decode(file);
99 }
100
101 /**
102 * 生成QRCode二维码<br>
103 * 在编码时需要将com.google.zxing.qrcode.encoder.Encoder.java中的<br>
104 * static final String DEFAULT_BYTE_MODE_ENCODING = "ISO8859-1";<br>
105 * 修改为UTF-8，否则中文编译后解析不了<br>
106 */
107 public void encode(String contents, File file, BarcodeFormat format, int width, int height, Map<EncodeHintType, ?> hints) {
108 try {
//消除乱码
contents = new String(contents.getBytes("UTF-8"), "ISO-8859-1");
109 BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, format, width, height);
110 writeToFile(bitMatrix, "png", file);
111 } catch (Exception e) {
112 e.printStackTrace();
113 }
114 }
115
116 /**
117 * 生成二维码图片<br>
118 *
119 * @param matrix
120 * @param format
121 * 图片格式
122 * @param file
123 * 生成二维码图片位置
124 * @throws IOException
125 */
126 public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
127 BufferedImage image = toBufferedImage(matrix);
128 ImageIO.write(image, format, file);
129 }
130
131 /**
132 * 生成二维码内容<br>
133 *
134 * @param matrix
135 * @return
136 */
137 public static BufferedImage toBufferedImage(BitMatrix matrix) {
138 int width = matrix.getWidth();
139 int height = matrix.getHeight();
140 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
141 for (int x = 0; x < width; x++) {
142 for (int y = 0; y < height; y++) {
143 image.setRGB(x, y, matrix.get(x, y) == true ? BLACK : WHITE);
144 }
145 }
146 return image;
147 }
148
149 /**
150 * 解析QRCode二维码
151 */
152 @SuppressWarnings("unchecked")
153 public void decode(File file) {
154 try {
155 BufferedImage image;
156 try {
157 image = ImageIO.read(file);
158 if (image == null) {
159 System.out.println("Could not decode image");
160 }
161 LuminanceSource source = new BufferedImageLuminanceSource(image);
162 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
163 Result result;
164 @SuppressWarnings("rawtypes")
165 Hashtable hints = new Hashtable();
166 //解码设置编码方式为：utf-8
167 hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
168 result = new MultiFormatReader().decode(bitmap, hints);
169 String resultStr = result.getText();
170 System.out.println("解析后内容：" + resultStr);
171 } catch (IOException ioe) {
172 System.out.println(ioe.toString());
173 } catch (ReaderException re) {
174 System.out.println(re.toString());
175 }
176 } catch (Exception ex) {
177 System.out.println(ex.toString());
178 }
179 }
180 }
是不是很简单.....
源码下载：http://files.cnblogs.com/hongten/QRCodes.rar
以上是关于java 二维码的主要内容，如果未能解决你的问题，请参考以下文章