Java实现的生成二维码和解析二维码URL操作示例

<!-- 二维码依赖 start --><dependency>  <groupId>com.google.zxing</groupId>  <artifactId>javase</artifactId>  <version>3.0.0</version></dependency>

package com.xgt.util;import com.google.zxing.*;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 org.apache.commons.io.IOUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import sun.misc.BASE64Encoder;import javax.imageio.ImageIO;import java.awt.image.BufferedImage;import java.io.*;import java.nio.file.Path;import java.util.Hashtable;public class QRCodeUtil {  private static final Logger logger = LoggerFactory.getLogger(QRCodeUtil.class);  /**   * 创建二维码   * @param url   * @param fileName   * @return   * @throws IOException   */  public static String createQRCode(String url,String fileDirectory,String fileName) throws IOException {    int width = 500;    int height = 500;    String format = "png";    Hashtable hints = new Hashtable();    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);    hints.put(EncodeHintType.MARGIN, 2);    try {      BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints);      File fileDir = new File(fileDirectory);      FileToolUtil.judeDirExists(fileDir);      Path file = new File(fileDirectory,fileName+".png").toPath();//在D盘生成二维码图片      MatrixToImageWriter.writeToPath(bitMatrix, format, file);      BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);      ByteArrayOutputStream os = new ByteArrayOutputStream();//新建流。      ImageIO.write(image, format, os);//利用ImageIO类提供的write方法，将bi以png图片的数据模式写入流。      byte b[] = os.toByteArray();//从流中获取数据数组。      String str = new BASE64Encoder().encode(b);      IOUtils.closeQuietly(os);      return str;    } catch (Exception e) {      // TODO Auto-generated catch block      e.printStackTrace();    }finally {      //DeleteFileUtil.delete(fileDirectory);    }    return "NULL";  }  /**   * 解析出二维码的url   * 无用   * @param file   * @param fileDirectory   * @throws NotFoundException   */  public static void anlaysisQRCode(File file,String fileDirectory) throws NotFoundException {    MultiFormatReader formatReader=new MultiFormatReader();    BufferedImage image=null;    try {      image = ImageIO.read(file);    BinaryBitmap binaryBitmap =new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));    Hashtable hints=new Hashtable();    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");    Result result=formatReader.decode(binaryBitmap,hints);    logger.info("解析结果："+result.toString());    logger.info("解析格式:"+result.getBarcodeFormat());    } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }finally {      DeleteFileUtil.delete(fileDirectory);    }  }}