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300
	private Integer width = 300;
	// 默认高为300
	private 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 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1
		qrCode.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 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 getHits() {
		return encodeHits;
	}

	public void setHits(Map hits) {
		this.encodeHits = hits;
	}

}

生成的图片二维码如图：