Java二维码生成代码

首先引入Jar包：

    com.google.zxing
    core
    3.2.1


    com.google.zxing
    javase
    3.2.1

然后开始撸代码

package com.zxtg.zshop.common;

import java.awt.BasicStroke;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class MatrixToImageWriterEx {
	
	private static final MatrixToLogoImageConfig DEFAULT_CONFIG = new MatrixToLogoImageConfig();
	
	/**
	 * 根据内容生成二维码数据
	 * @param content 二维码文字内容[为了信息安全性，一般都要先进行数据加密]
	 * @param width 二维码照片宽度
	 * @param height 二维码照片高度
	 * @return
	 */
	public static BitMatrix createQRCode(String content, int width, int height){
		Hashtable hints = new Hashtable();   
		//设置字符编码
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  
        // 指定纠错等级
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        BitMatrix matrix = null;  
        try {  
            matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints); 
        } catch (WriterException e) {  
            e.printStackTrace();  
        }
        return matrix;
	}
	
	/**
	 * 写入二维码、以及将照片logo写入二维码中
	 * @param matrix 要写入的二维码
	 * @param format 二维码照片格式
	 * @param imagePath 二维码照片保存路径
	 * @param logoPath logo路径
	 * @throws IOException
	 */
	public static void writeToFile(BitMatrix matrix, String format, String imagePath, String logoPath) throws IOException {
		MatrixToImageWriter.writeToFile(matrix, format, new File(imagePath), new MatrixToImageConfig());
		
		//添加logo图片, 此处一定需要重新进行读取，而不能直接使用二维码的BufferedImage 对象
		BufferedImage img = ImageIO.read(new File(imagePath));
		MatrixToImageWriterEx.overlapImage(img, format, imagePath, logoPath, DEFAULT_CONFIG);
	}
	/**
	 * 写入二维码、以及将照片logo写入二维码中
	 * @param matrix 要写入的二维码
	 * @param format 二维码照片格式
	 * @param imagePath 二维码照片保存路径
	 * @param logoPath logo路径
	 * @param logoConfig logo配置对象
	 * @throws IOException
	 */
	public static void writeToFile(BitMatrix matrix, String format, String imagePath, String logoPath, MatrixToLogoImageConfig logoConfig) throws IOException {
		MatrixToImageWriter.writeToFile(matrix, format, new File(imagePath), new MatrixToImageConfig());
		
		//添加logo图片, 此处一定需要重新进行读取，而不能直接使用二维码的BufferedImage 对象
		BufferedImage img = ImageIO.read(new File(imagePath));
		MatrixToImageWriterEx.overlapImage(img, format, imagePath, logoPath, logoConfig);
	}

	/**
	 * 将照片logo添加到二维码中间
	 * @param image 生成的二维码照片对象
	 * @param imagePath 照片保存路径
	 * @param logoPath logo照片路径
	 * @param formate 照片格式
	 */
	public static void overlapImage(BufferedImage image, String formate, String imagePath, String logoPath, MatrixToLogoImageConfig logoConfig) {
		try {
			BufferedImage logo = ImageIO.read(new File(logoPath));
			Graphics2D g = image.createGraphics();
			//考虑到logo照片贴到二维码中，建议大小不要超过二维码的1/5;
			int width = image.getWidth() / logoConfig.getLogoPart();
			int height = image.getHeight() / logoConfig.getLogoPart();
			//logo起始位置，此目的是为logo居中显示
			int x = (image.getWidth() - width) / 2;
			int y = (image.getHeight() - height) / 2;
			//绘制图
			g.drawImage(logo, x, y, width, height, null);
			
			//给logo画边框
			//构造一个具有指定线条宽度以及 cap 和 join 风格的默认值的实心 BasicStroke
			g.setStroke(new BasicStroke(logoConfig.getBorder()));
			g.setColor(logoConfig.getBorderColor());
			g.drawRect(x, y, width, height);
			
			g.dispose();
			//写入logo照片到二维码
			ImageIO.write(image, formate, new File(imagePath));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
}

最后我们调用QrcodeGenerator.encode方法一下：

package com.zxtg.zshop.util;

import java.awt.Color;
import java.awt.image.BufferedImage;

import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.zxtg.zshop.common.MatrixToImageWriterEx;

public class QrcodeGenerator {
	
	public static BufferedImage encode(String content, int width, int height) {
		try {
			BitMatrix matrix = MatrixToImageWriterEx.createQRCode(content, width, height);
			BufferedImage image = MatrixToImageWriter.toBufferedImage(matrix);
			return image;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	} 
}