spring boot使用zxing 二维码应用

1.在POM.XML文件添加引用ZXING

		
			com.google.zxing
			core
			3.3.0
		

		
			com.google.zxing
			javase
			3.3.0
		

2. 编写一个工具类QR,代码如下，直接贴上代码 

package com.myapp.util;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
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
 *  
 */
public class QrCodeUtil {

    //编码格式,采用utf-8
    private static final String UNICODE = "utf-8";
    //图片格式
    private static final String FORMAT = "JPG";
    //二维码宽度像素pixels数量
    private static final int QRCODE_WIDTH = 300;
    //二维码高度像素pixels数量
    private static final int QRCODE_HEIGHT = 300;
    //LOGO宽度像素pixels数量
    private static final int LOGO_WIDTH = 100;
    //LOGO高度像素pixels数量
    private static final int LOGO_HEIGHT = 100;

    //生成二维码图片
    //content 二维码内容
    //logoPath logo图片地址
    private static BufferedImage createImage(String content, String logoPath) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, UNICODE);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_WIDTH, QRCODE_HEIGHT,
                hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (logoPath == null || "".equals(logoPath)) {
            return image;
        }
        // 插入图片
        QrCodeUtil.insertImage(image, logoPath);
        return image;
    }

    //在图片上插入LOGO
    //source 二维码图片内容
    //logoPath LOGO图片地址
    private static void insertImage(BufferedImage source, String logoPath) throws Exception {
        File file = new File(logoPath);
        if (!file.exists()) {
            throw new Exception("logo file not found.");
        }
        Image src = ImageIO.read(new File(logoPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
            if (width > LOGO_WIDTH) {
                width = LOGO_WIDTH;
            }
            if (height > LOGO_HEIGHT) {
                height = LOGO_HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_WIDTH - width) / 2;
        int y = (QRCODE_HEIGHT - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    //生成带logo的二维码图片，保存到指定的路径
    // content 二维码内容
    // logoPath logo图片地址
    // destPath 生成图片的存储路径
    public static String save(String content, String logoPath, String destPath) throws Exception {
        BufferedImage image = QrCodeUtil.createImage(content, logoPath);
        File file = new File(destPath);
        String path = file.getAbsolutePath();
        File filePath = new File(path);
        if (!filePath.exists() && !filePath.isDirectory()) {
            filePath.mkdirs();
        }
        String fileName = file.getName();
        fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length())
                + "." + FORMAT.toLowerCase();
        System.out.println("destPath:"+destPath);
        ImageIO.write(image, FORMAT, new File(destPath));
        return fileName;
    }

    //生成二维码图片，直接输出到OutputStream
    /**
     * 
     * @param content  二维码内容
     * @param logoPath LOGO 路径
     * @param output 输出路径
     * @throws Exception
     */
    public static void encode(String content, String logoPath, OutputStream output)
            throws Exception {
        BufferedImage image = QrCodeUtil.createImage(content, logoPath);
        ImageIO.write(image, FORMAT, output);
    }

    //解析二维码图片，得到包含的内容
    public static String decode(String path) throws Exception {
        File file = new File(path);
        BufferedImage image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, UNICODE);
        result = new MultiFormatReader().decode(bitmap, hints);
        return result.getText();
    }
}

3.编写一个controller,直接贴上代码，为了应用程序打包以后，可以在windows和liunx上运行，建立将logo图片，以静态资源形式，存放，方便程序可移槙性。

package com.myapp.controller;

import java.io.OutputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.util.ClassUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.myapp.util.QrCodeUtil;

@RequestMapping("/barcode")
@Controller
public class QrCodeController {

	// 生成带logo的二维码到response
	@RequestMapping("/qrcode")
	public void qrcode(HttpServletRequest request, HttpServletResponse response) {
		String requestUrl = "http://www.baidu.com";
		try {
            //logo文件路径，如果没有把path设定为空值
			String path = ClassUtils.getDefaultClassLoader().getResource("static/logo.jpeg").getPath();

			OutputStream os = response.getOutputStream();
			QrCodeUtil.encode(requestUrl, path, os);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	// 生成不带logo的二维码到response
	@RequestMapping("/qrnologo")
	public void qrnologo(HttpServletRequest request, HttpServletResponse response) {
		String requestUrl = "http://www.baidu.com";
		try {
			OutputStream os = response.getOutputStream();
			QrCodeUtil.encode(requestUrl, null, os);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	// 把二维码保存成文件
	@RequestMapping("/qrsave")
	@ResponseBody
	public String qrsave() {
		String requestUrl = "http://www.baidu.com";
		try {
			QrCodeUtil.save(requestUrl, null, "/data/qrcode2.jpg");
			return "文件已保存";
		} catch (Exception e) {
			e.printStackTrace();
			return "文件保存失败" + e.getMessage();
		}

	}

	// 解析二维码中的文字
	@RequestMapping("/qrtext")
	@ResponseBody
	public String qrtext() {
		String url = "";
		try {
			url = QrCodeUtil.decode("/data/qrcode2.jpg");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return "解析到的url:" + url;
	}
}

 3.1  logo图片存放路径如下

4. 在前端页面调用，代码如下，请注意API访问的路径和函数地址

 5.启动应用程序，在浏览器中访问就行了呢