zxing实现二维码生成和解析

生成二维码的方式有很多，在此简单介绍Google的zxing使用

先加载需要用到的包，pom.xml文件里面添加：

<!-- 二维码生成 --><dependency>  <groupId>com.google.zxing</groupId>  <artifactId>core</artifactId>  <version>2.2</version></dependency><dependency>  <groupId>com.google.zxing</groupId>  <artifactId>javase</artifactId>  <version>2.2</version></dependency>

工具类代码

import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.nio.file.FileSystems;import java.nio.file.Path;import java.util.HashMap;import java.util.Map;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat;import com.google.zxing.Binarizer;import com.google.zxing.BinaryBitmap;import com.google.zxing.DecodeHintType;import com.google.zxing.EncodeHintType;import com.google.zxing.LuminanceSource;import com.google.zxing.MultiFormatReader;import com.google.zxing.MultiFormatWriter;import com.google.zxing.NotFoundException;import com.google.zxing.Result;import com.google.zxing.WriterException;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import net.sf.json.JSONObject;/** *  * 处理图片url */public class QRCodeUtil {public static void main(String[] args) throws WriterException, IOException {testEncode();testDecode();}/** * 生成图像 *  * @throws WriterException * @throws IOException */public static void testEncode() throws WriterException, IOException {String filePath = "D://";String fileName = "text.png";JSONObject json = new JSONObject();json.put("url", "https://www.baidu.com");json.put("author", "zwm");String content = json.toString();// 内容int width = 200; // 图像宽度int height = 200; // 图像高度String format = "png";// 图像类型Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);// 生成矩阵Path path = FileSystems.getDefault().getPath(filePath, fileName);File file = new File(filePath + fileName);MatrixToImageWriter.writeToFile(bitMatrix, format, file);// 输出图像System.out.println("图片文件已经生成.请于D盘查找");}/** * 解析图像 */public static void testDecode() {String filePath = "D://text.png";BufferedImage image;try {image = ImageIO.read(new File(filePath));LuminanceSource source = new BufferedImageLuminanceSource(image);Binarizer binarizer = new HybridBinarizer(source);BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");Result result = new MultiFormatReader().decode(binaryBitmap, hints);// 对图像进行解码JSONObject content = JSONObject.fromObject(result.getText());System.out.println("图片中内容：  ");System.out.println("author:" + content.getString("author"));System.out.println("url：  " + content.getString("url"));System.out.println("图片中格式：  ");System.out.println("encode： " + result.getBarcodeFormat());} catch (IOException e) {e.printStackTrace();} catch (NotFoundException e) {e.printStackTrace();}}public static BufferedImage createQRCode(final String url) throws WriterException, IOException {BufferedImage image = null;// 二维码图片输出流MultiFormatWriter multiFormatWriter = new MultiFormatWriter();HashMap<EncodeHintType, Comparable> hints = new HashMap<EncodeHintType, Comparable>();// 设置编码方式hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");// 设置QR二维码的纠错级别（H为最高级别）具体级别信息hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);BitMatrix bitMatrix = multiFormatWriter.encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);bitMatrix = updateBit(bitMatrix, 10);image = MatrixToImageWriter.toBufferedImage(bitMatrix);return image;}/** * 自定义白边边框宽度 * * @param matrix * @param margin * @return */private static BitMatrix updateBit(final BitMatrix matrix, final int margin) {int tempM = margin * 2;// 获取二维码图案的属性int[] rec = matrix.getEnclosingRectangle();int resWidth = rec[2] + tempM;int resHeight = rec[3] + tempM;// 按照自定义边框生成新的BitMatrixBitMatrix resMatrix = new BitMatrix(resWidth, resHeight);resMatrix.clear();// 循环，将二维码图案绘制到新的bitMatrix中for (int i = margin; i < resWidth - margin; i++) {for (int j = margin; j < resHeight - margin; j++) {if (matrix.get(i - margin + rec[0], j - margin + rec[1])) {resMatrix.set(i, j);}}}return resMatrix;}}

直接运行即可看到效果，其中createQRCode是用于直接将生成的二维码以流的形式在页面上输出，调用方法如下：

/**     * 根据URL生成二维码     * @param model     * @param request     * @param response     * @throws MaHuaServiceHandleException     */    @RequestMapping("/getQRCode")    public void getQRCode(final @RequestAttribute(ReqBean.NAME) ReqBean reqBean,HttpServletRequest request, HttpServletResponse response){        String url = "http://www.baidu.com";        //二维码图片输出流        OutputStream out = null;        try{            response.setContentType("image/jpeg;charset=UTF-8");            BufferedImage image = QRCodeUtil.createQRCode(url);            //实例化输出流对象            out = response.getOutputStream();            //画图            ImageIO.write(image, "png", response.getOutputStream());            out.flush();            out.close();        }catch (Exception e){            e.printStackTrace();        }finally {            try{                if (null != response.getOutputStream()) {                    response.getOutputStream().close();                }                if (null != out) {                    out.close();                }            }catch(Exception e){                e.printStackTrace();            }        }    }

 在页面上调用此方法：

 <div style="height:100%;width:100%"><img style="width:100%" id="QRCode" src="./activity/getQRCode.do?" /></div>  

  这样生成的二维码则会再这个div的地方显示出来