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);
    }
  }
}