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）

 package com.lhj.code;

 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;

     }

     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 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;

     }

     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);

     }

 }

BufferedImageLuminanceSource

 package com.lhj.code;

 import java.awt.BasicStroke;

 import java.awt.Graphics;

 import java.awt.Graphics2D;

 import java.awt.Image;

 import java.awt.Shape;

 import java.awt.geom.RoundRectangle2D;

 import java.awt.image.BufferedImage;

 import java.io.File;

 import java.io.OutputStream;

 import java.util.Hashtable;

 import java.util.Random;

 import javax.imageio.ImageIO;

 import com.google.zxing.BarcodeFormat;

 import com.google.zxing.BinaryBitmap;

 import com.google.zxing.DecodeHintType;

 import com.google.zxing.EncodeHintType;

 import com.google.zxing.MultiFormatReader;

 import com.google.zxing.MultiFormatWriter;

 import com.google.zxing.Result;

 import com.google.zxing.common.BitMatrix;

 import com.google.zxing.common.HybridBinarizer;

 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

 public class QRCodeUtil {

     private static final String CHARSET = "utf-8";

     private static final String FORMAT_NAME = "JPG";

     // 二维码尺寸

     private static final int QRCODE_SIZE = 300;

     // LOGO宽度

     private static final int WIDTH = 60;

     // LOGO高度

     private static final int HEIGHT = 60;

     private static BufferedImage createImage(String content, String imgPath,

             boolean needCompress) throws Exception {

         Hashtable hints = new Hashtable();

         hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

         hints.put(EncodeHintType.CHARACTER_SET, CHARSET);

         hints.put(EncodeHintType.MARGIN, 1);

         BitMatrix bitMatrix = new MultiFormatWriter().encode(content,

                 BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);

         int width = bitMatrix.getWidth();

         int height = bitMatrix.getHeight();

         BufferedImage image = new BufferedImage(width, height,

                 BufferedImage.TYPE_INT_RGB);

         for (int x = 0; x < width; x++) {

             for (int y = 0; y < height; y++) {

                 image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000

                         : 0xFFFFFFFF);

             }

         }

         if (imgPath == null || "".equals(imgPath)) {

             return image;

         }

         // 插入图片

         QRCodeUtil.insertImage(image, imgPath, needCompress);

         return image;

     }

     private static void insertImage(BufferedImage source, String imgPath,

             boolean needCompress) throws Exception {

         File file = new File(imgPath);

         if (!file.exists()) {

             System.err.println(""+imgPath+"   该文件不存在！");

             return;

         }

         Image src = ImageIO.read(new File(imgPath));

         int width = src.getWidth(null);

         int height = src.getHeight(null);

         if (needCompress) { // 压缩LOGO

             if (width > WIDTH) {

                 width = WIDTH;

             }

             if (height > HEIGHT) {

                 height = HEIGHT;

             }

             Image image = src.getScaledInstance(width, height,

                     Image.SCALE_SMOOTH);

             BufferedImage tag = new BufferedImage(width, height,

                     BufferedImage.TYPE_INT_RGB);

             Graphics g = tag.getGraphics();

             g.drawImage(image, 0, 0, null); // 绘制缩小后的图

             g.dispose();

             src = image;

         }

         // 插入LOGO

         Graphics2D graph = source.createGraphics();

         int x = (QRCODE_SIZE - width) / 2;

         int y = (QRCODE_SIZE - height) / 2;

         graph.drawImage(src, x, y, width, height, null);

         Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);

         graph.setStroke(new BasicStroke(3f));

         graph.draw(shape);

         graph.dispose();

     }

     public static void encode(String content, String imgPath, String destPath,

             boolean needCompress) throws Exception {

         BufferedImage image = QRCodeUtil.createImage(content, imgPath,

                 needCompress);

         mkdirs(destPath);

         String file = new Random().nextInt(99999999)+".jpg";

         ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));

     }

     public static void mkdirs(String destPath) {

         File file =new File(destPath);

         //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)

         if (!file.exists() && !file.isDirectory()) {

             file.mkdirs();

         }

     }

     public static void encode(String content, String imgPath, String destPath)

             throws Exception {

         QRCodeUtil.encode(content, imgPath, destPath, false);

     }

     public static void encode(String content, String destPath,

             boolean needCompress) throws Exception {

         QRCodeUtil.encode(content, null, destPath, needCompress);

     }

     public static void encode(String content, String destPath) throws Exception {

         QRCodeUtil.encode(content, null, destPath, false);

     }

     public static void encode(String content, String imgPath,

             OutputStream output, boolean needCompress) throws Exception {

         BufferedImage image = QRCodeUtil.createImage(content, imgPath,

                 needCompress);

         ImageIO.write(image, FORMAT_NAME, output);

     }

     public static void encode(String content, OutputStream output)

             throws Exception {

         QRCodeUtil.encode(content, null, output, false);

     }

     public static String decode(File file) throws Exception {

         BufferedImage image;

         image = ImageIO.read(file);

         if (image == null) {

             return null;

         }

         BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(

                 image);

         BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

         Result result;

         Hashtable hints = new Hashtable();

         hints.put(DecodeHintType.CHARACTER_SET, CHARSET);

         result = new MultiFormatReader().decode(bitmap, hints);

         String resultStr = result.getText();

         return resultStr;

     }

     public static String decode(String path) throws Exception {

         return QRCodeUtil.decode(new File(path));

     }

 }

QRCodeUtil

 package com.lhj.code;

 /**

  * 二维码生成测试类

  * @author Cloud

  * @data   2016-11-21

  * QRCodeTest

  */

 public class QRCodeTest {

     public static void main(String[] args) throws Exception {

         String text = "http://www.cnblogs.com/mmzs/";

         //不带logo的二维码

         QRCodeUtil.encode(text, "", "d:/test", true);

         //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

         //QRCodeUtil.encode(text, "d:/test");//参数依次代表：内容；二维码输出目录；

         //带logo的二维码

         QRCodeUtil.encode(text, "d:/test/1.jpg", "d:/test", true);

        System.out.println("success");

    }

 }

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

巴特西

Java二维码的制作

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