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package QrCodeUtil;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Hashtable;
import javax.imageio.ImageIO;
import com.alibaba.druid.util.StringUtils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 生成二维码
*/
public class QrCodeUtil {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
private static final int margin = 0;
private static final int LogoPart = 4;
public static void main(String[] args) throws WriterException {
//二维码内容
String content = "IT技术分享社区，一个有态度的互联网社区交流平台";
String logoPath = "D:\\logo.png"; // 二维码中间的logo信息 非必须
String format = "jpg";
int width = 120; // 二维码宽度
int height = 120;// 二维码高度
// 设置二维码矩阵的信息
BitMatrix bitMatrix = setBitMatrix(content, width, height);
// 设置输出流
OutputStream outStream = null;
String path = "d:/Code" + new Date().getTime() + ".png";//设置二维码的文件名
try {
outStream = new FileOutputStream(new File(path));
// 目前 针对容错等级为H reduceWhiteArea 二维码空白区域的大小 根据实际情况设置，如果二维码内容长度不固定的话 需要自己根据实际情况计算reduceWhiteArea的大小
writeToFile(bitMatrix, format, outStream, logoPath, 5);
outStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 设置生成二维码矩阵信息
* @param content 二维码图片内容
* @param width 二维码图片宽度
* @param height 二维码图片高度
* @throws WriterException
*/
private static BitMatrix setBitMatrix(String content, int width, int height) throws WriterException {
BitMatrix bitMatrix = null;
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); // 指定编码方式,避免中文乱码
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 指定纠错等级 如果二维码里面的内容比较多的话推荐使用H 容错率30%， 这样可以避免一些扫描不出来的问题
hints.put(EncodeHintType.MARGIN, margin); // 指定二维码四周白色区域大小 官方的这个方法目前没有没有作用默认设置为0
bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
return bitMatrix;
}
/**
* @param matrix
* @param format
* @param outStream
* @param logoPath logo图片
* @param reduceWhiteArea 二维码空白区域设置
* @throws IOException
*/
private static void writeToFile(BitMatrix matrix, String format, OutputStream outStream, String logoPath, int reduceWhiteArea) throws IOException {
BufferedImage image = toBufferedImage(matrix, reduceWhiteArea);
// 如果设置了二维码里面的logo 加入LOGO水印
if (!StringUtils.isEmpty(logoPath)) {
image = addLogo(image, logoPath);
}
ImageIO.write(image, format, outStream);
}
/**
*
* @param matrix
* @param reduceWhiteArea
* @return
*/
private static BufferedImage toBufferedImage(BitMatrix matrix, int reduceWhiteArea) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width - 2 * reduceWhiteArea, height - 2 * reduceWhiteArea, BufferedImage.TYPE_3BYTE_BGR);
for (int x = reduceWhiteArea; x < width - reduceWhiteArea; x++) {
for (int y = reduceWhiteArea; y < height - reduceWhiteArea; y++) {
image.setRGB(x - reduceWhiteArea, y - reduceWhiteArea, matrix.get(x, y) ? BLACK : WHITE);
}
}
return image;
}
/**
* 给二维码图片中绘制logo信息 非必须
* @param image 二维码图片
* @param logoPath logo图片路径
*/
private static BufferedImage addLogo(BufferedImage image, String logoPath) throws IOException {
Graphics2D g = image.createGraphics();
BufferedImage logoImage = ImageIO.read(new File(logoPath));
// 计算logo图片大小,可适应长方形图片,根据较短边生成正方形
int width = image.getWidth() < image.getHeight() ? image.getWidth() / LogoPart : image.getHeight() / LogoPart;
int height = width;
// 计算logo图片放置位置
int x = (image.getWidth() - width) / 2;
int y = (image.getHeight() - height) / 2;
// 在二维码图片上绘制中间的logo
g.drawImage(logoImage, x, y, width, height, null);
// 绘制logo边框,可选
g.setStroke(new BasicStroke(2)); // 画笔粗细
g.setColor(Color.WHITE); // 边框颜色
g.drawRect(x, y, width, height); // 矩形边框
logoImage.flush();
g.dispose();
return image;
}
}
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