二维码工具类QrCodeUtils

package com.chenb.test;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.OutputStream;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.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;//二维码工具类（使用ZXingjar包）public class QRCodeUtils {// 默认宽为300private Integer width = 300;// 默认高为300private Integer height = 300;// 默认二维码图片格式private String imageFormat = "png";// 默认二维码字符编码private String charType = "utf-8";// 默认二维码的容错级别private ErrorCorrectionLevel corretionLevel = ErrorCorrectionLevel.H;// 二维码与图片的边缘private Integer margin = 1;// 二维码参数private Map<EncodeHintType, Object> encodeHits = new HashMap<>();//main方法测试工具类public static void main(String[] args) {QRCodeUtils qrCode=new QRCodeUtils(300,300);//设置二维码的边缘为1qrCode.setMargin(1);//设置输出到桌面String path=System.getProperty("user.home")+File.separator+"Desktop"+File.separator+"test.png";//创建图片二维码qrCode.createQrImage("https://www.baidu.com/", path);//识别图片二维码的内容System.out.println(qrCode.decodeQrImage(new File(path)));//https://www.baidu.com/}public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType,ErrorCorrectionLevel corretionLevel, Integer margin) {if (width != null) {this.width = width;}if (height != null) {this.height = height;}if (imageFormat != null) {this.imageFormat = imageFormat;}if (charType != null) {this.charType = charType;}if (corretionLevel != null) {this.corretionLevel = corretionLevel;}if (margin != null) {this.margin = margin;}}public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType,ErrorCorrectionLevel corretionLevel) {this(width, height, imageFormat, charType, corretionLevel, null);}public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType, Integer margin) {this(width, height, imageFormat, charType, null, margin);}public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType) {this(width, height, imageFormat, charType, null, null);}public QRCodeUtils(Integer width, Integer height, String imageFormat) {this(width, height, imageFormat, null, null, null);}public QRCodeUtils(Integer width, Integer height) {this(width, height, null, null, null, null);}public QRCodeUtils() {}// 初始化二维码的参数private void initialParamers() {// 字符编码encodeHits.put(EncodeHintType.CHARACTER_SET, this.charType);// 容错等级 L、M、Q、H 其中 L 为最低, H 为最高encodeHits.put(EncodeHintType.ERROR_CORRECTION, this.corretionLevel);// 二维码与图片边距encodeHits.put(EncodeHintType.MARGIN, margin);}// 得到二维码图片public BufferedImage getBufferedImage(String content) {initialParamers();BufferedImage bufferedImage = null;try {BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width,this.height, this.encodeHits);bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix);} catch (WriterException e) {e.printStackTrace();return null;}return bufferedImage;}// 将二维码保存到输出流中public void writeToStream(String content, OutputStream os) {initialParamers();try {BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);MatrixToImageWriter.writeToStream(matrix, this.imageFormat, os);} catch (Exception e) {e.printStackTrace();}}// 将二维码图片保存为文件public void createQrImage(String content, File file) {initialParamers();try {BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);MatrixToImageWriter.writeToFile(matrix, this.imageFormat, file);} catch (Exception e) {e.printStackTrace();}}// 将二维码图片保存到指定路径public void createQrImage(String content, String path) {initialParamers();try {BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);MatrixToImageWriter.writeToPath(matrix, this.imageFormat, new File(path).toPath());} catch (Exception e) {e.printStackTrace();}}//识别图片二维码public String decodeQrImage(File file){String content=null;try {BufferedImage bufferedImage=ImageIO.read(new FileInputStream(file));LuminanceSource source=new BufferedImageLuminanceSource(bufferedImage);Binarizer binarizer=new HybridBinarizer(source);BinaryBitmap image=new BinaryBitmap(binarizer);Map<DecodeHintType,Object> decodeHits=new HashMap<>();decodeHits.put(DecodeHintType.CHARACTER_SET, this.charType);Result result=new MultiFormatReader().decode(image, decodeHits);content=result.getText();}catch (Exception e) {e.printStackTrace();}return content;}public Integer getWidth() {return width;}public void setWidth(Integer width) {this.width = width;}public Integer getHeight() {return height;}public void setHeight(Integer height) {this.height = height;}public String getImageFormat() {return imageFormat;}public void setImageFormat(String imageFormat) {this.imageFormat = imageFormat;}public String getCharType() {return charType;}public void setCharType(String charType) {this.charType = charType;}public ErrorCorrectionLevel getCorretionLevel() {return corretionLevel;}public void setCorretionLevel(ErrorCorrectionLevel corretionLevel) {this.corretionLevel = corretionLevel;}public Integer getMargin() {return margin;}public void setMargin(Integer margin) {this.margin = margin;}public Map<EncodeHintType, Object> getHits() {return encodeHits;}public void setHits(Map<EncodeHintType, Object> hits) {this.encodeHits = hits;}}

生成的图片二维码如图：