?

　　自從微信掃描出世，二維碼掃描逐漸已經成為一種主流的信息傳遞和交換方式。下面就介紹一下我學習到的這種二維碼生成方式。預計再過不久身份證戶口本等都會使用二維碼識別了，今天就做一個實驗案例；

?

二維碼主要實現這兩點：

　　1.生成任意的二維碼。

　　2.在二維碼的中間加入圖像。

?

　一、準備工作。

準備QR二維碼3.0?版本的core包和一張jpg圖片。

下載QR二維碼包。

?

當然你也可以從maven倉庫下載jar?包:?http://central.maven.org/maven2/com/google/zxing/core/

二、程序設計

?1、啟動eclipse，新建一個java項目，命好項目名（本例取名為QRCodeSoft）。點下一步：

?

?

2、導入zxing.jar?包,?我這里用的是3.0?版本的core包：點“添加外部JAR(X)…”。

?

?

3、新建兩個類，分別是：

BufferedImageLuminanceSource.java

QRCodeUtil.java

?

package com.code.liu;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);} }

?

? package com.code.liu;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;/*** 二維碼工具類* */ public class QRCodeUtil {private static final String CHARSET = "utf-8";private static final String FORMAT_NAME = "JPG";// 二維碼尺寸private static final int QRCODE_SIZE = 300;// LOGO寬度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<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();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;}// 插入圖片 QRCodeUtil.insertImage(image, imgPath, needCompress);return image;}/*** 插入LOGO* * @param source* 二維碼圖片* @param imgPath* LOGO圖片地址* @param needCompress* 是否壓縮* @throws Exception*/private static void insertImage(BufferedImage source, String imgPath,boolean needCompress) throws Exception {File file = new File(imgPath);if (!file.exists()) {System.err.println(""+imgPath+" 該文件不存在！");return;}Image src = ImageIO.read(new File(imgPath));int width = src.getWidth(null);int height = src.getHeight(null);if (needCompress) { // 壓縮LOGOif (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); // 繪制縮小后的圖 g.dispose();src = image;}// 插入LOGOGraphics2D 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();}/*** 生成二維碼(內嵌LOGO)* * @param content* 內容* @param imgPath* LOGO地址* @param destPath* 存放目錄* @param needCompress* 是否壓縮LOGO* @throws Exception*/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));}/*** 當文件夾不存在時，mkdirs會自動創建多層目錄，區別于mkdir．(mkdir如果父目錄不存在則會拋出異常)* @author lanyuan* Email: mmm333zzz520@163.com* @date 2013-12-11 上午10:16:36* @param destPath 存放目錄*/public static void mkdirs(String destPath) {File file =new File(destPath); //當文件夾不存在時，mkdirs會自動創建多層目錄，區別于mkdir．(mkdir如果父目錄不存在則會拋出異常)if (!file.exists() && !file.isDirectory()) {file.mkdirs();}}/*** 生成二維碼(內嵌LOGO)* * @param content* 內容* @param imgPath* LOGO地址* @param destPath* 存儲地址* @throws Exception*/public static void encode(String content, String imgPath, String destPath)throws Exception {QRCodeUtil.encode(content, imgPath, destPath, false);}/*** 生成二維碼* * @param content* 內容* @param destPath* 存儲地址* @param needCompress* 是否壓縮LOGO* @throws Exception*/public static void encode(String content, String destPath,boolean needCompress) throws Exception {QRCodeUtil.encode(content, null, destPath, needCompress);}/*** 生成二維碼* * @param content* 內容* @param destPath* 存儲地址* @throws Exception*/public static void encode(String content, String destPath) throws Exception {QRCodeUtil.encode(content, null, destPath, false);}/*** 生成二維碼(內嵌LOGO)* * @param content* 內容* @param imgPath* LOGO地址* @param output* 輸出流* @param needCompress* 是否壓縮LOGO* @throws Exception*/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);}/*** 生成二維碼* * @param content* 內容* @param output* 輸出流* @throws Exception*/public static void encode(String content, OutputStream output)throws Exception {QRCodeUtil.encode(content, null, output, false);}/*** 解析二維碼* * @param file* 二維碼圖片* @return* @throws Exception*/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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();hints.put(DecodeHintType.CHARACTER_SET, CHARSET);result = new MultiFormatReader().decode(bitmap, hints);String resultStr = result.getText();return resultStr;}/*** 解析二維碼* * @param path* 二維碼圖片地址* @return* @throws Exception*/public static String decode(String path) throws Exception {return QRCodeUtil.decode(new File(path));}public static void main(String[] args) throws Exception {String text = "http://www.cnblogs.com/qianxiaoruofeng/";QRCodeUtil.encode(text, "c:/Users/Administrator/Desktop/liupeng/1.png", "c:/Users/Administrator/Desktop/liupeng/barcode", true);} }

?

生成不帶logo?的二維碼

程序代碼

?

public static void main(String[] args) throws Exception {
????????String text = "http://www.cnblogs.com/qianxiaoruofeng/";

????????QRCodeUtil.encode(text,"",?"c:/Users/Administrator/Desktop/liupeng/barcode",true);

?}

運行這個測試方法，生成的二維碼不帶?logo ,?樣式如下:

有興趣可以用手機掃描一下

生成帶logo?的二維碼?
logo?可以用自己的頭像，或者自己喜歡的一個圖片都可以?,?采用如下代碼

程序代碼

?

public static void main(String[] args) throws Exception {
????????String text = "http://www.cnblogs.com/qianxiaoruofeng/";

QRCodeUtil.encode(text, "c:/Users/Administrator/Desktop/liupeng/1.png", "c:/Users/Administrator/Desktop/liupeng/barcode", true);

????}

唯一的區別是，在前面的基礎上指定了logo?的地址，這里測試都用了C盤的圖片文件

?

手機掃描二維碼進入淺笑若風的博客。

?

轉載于:https://www.cnblogs.com/qianxiaoruofeng/p/8391460.html

總結

以上是生活随笔為你收集整理的java二维码生成技术的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。