<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.4.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.4.0</version>
</dependency>
package com.xxx.utils;
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.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.xxx.entity.UserPo;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
public class QrCodeUtil {
private static final Log log = LogFactory.getLog(QrCodeUtil.class);
private static final QRCodeWriter QR_CODE_WRITER = new QRCodeWriter();
// 设置默认参数，可以根据需要进行修改
private static final int QRCOLOR = 0xFF000000; // 默认是黑色
private static final int BGWHITE = 0xFFFFFFFF; // 背景颜色
private static final int WIDTH = 180; // 二维码宽
private static final int HEIGHT = 180; // 二维码高
/**
* 生成二维码字节数组.
*/
public static byte[] generateQrCode(String text, String format, int width, int height) {
try (ByteArrayOutputStream os = new ByteArrayOutputStream()) {
BitMatrix bitMatrix = QR_CODE_WRITER.encode(text, BarcodeFormat.QR_CODE, width, height);
MatrixToImageWriter.writeToStream(bitMatrix, format, os);
return os.toByteArray();
} catch (WriterException e) {
throw new RuntimeException(String.format("fail to generate qr code:text[%s]", text), e);
} catch (IOException e) {
throw new RuntimeException(String.format("fail to writeToStream when generating qr code: text[%s]", text), e);
}
}
/**
* 保存二维码图片到文件系统.
*/
public static void generateQrCodeAndSave(String text, String format, int width, int height, String path) {
try {
BitMatrix bitMatrix = QR_CODE_WRITER.encode(text, BarcodeFormat.QR_CODE, width, height);
MatrixToImageWriter.writeToPath(bitMatrix, format, Paths.get(path));
} catch (WriterException e) {
throw new RuntimeException(String.format("fail to generate qr code:text[%s]", text), e);
} catch (IOException e) {
throw new RuntimeException(String.format("fail to writeToStream when generating qr code: text[%s]", text), e);
}
}
/**
* 用于设置QR二维码参数
* com.google.zxing.EncodeHintType：编码提示类型,枚举类型
* EncodeHintType.CHARACTER_SET：设置字符编码类型
* EncodeHintType.ERROR_CORRECTION：设置误差校正
* ErrorCorrectionLevel：误差校正等级，L = ~7% correction、M = ~15% correction、Q = ~25% correction、H = ~30% correction
* 不设置时，默认为 L 等级，等级不一样，生成的图案不同，但扫描的结果是一样的
* EncodeHintType.MARGIN：设置二维码边距，单位像素，值越小，二维码距离四周越近
* */
private static Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>() {
private static final long serialVersionUID = 1L;
{
put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 设置QR二维码的纠错级别（H为最高级别）具体级别信息
put(EncodeHintType.CHARACTER_SET, "utf-8");// 设置编码方式
put(EncodeHintType.MARGIN, 0);
}
};
public static BufferedImage createQr(UserPo po, Font font) throws WriterException{
String content = po.getExtend1();
String sampleCode = po.getExtend2();
String sampleName = po.getExtend3();
/**
* MultiFormatWriter:多格式写入，这是一个工厂类，里面重载了两个 encode 方法，用于写入条形码或二维码
* encode(String contents,BarcodeFormat format,int width, int height,Map<EncodeHintType,?> hints)
* contents:条形码/二维码内容
* format：编码类型，如 条形码，二维码 等
* width：码的宽度
* height：码的高度
* hints：码内容的编码类型
* BarcodeFormat：枚举该程序包已知的条形码格式，即创建何种码，如 1 维的条形码，2 维的二维码 等
* BitMatrix：位(比特)矩阵或叫2D矩阵，也就是需要的二维码
*/
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
/**参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度，设置参数
* BitMatrix 的 get(int x, int y) 获取比特矩阵内容，指定位置有值，则返回true，将其设置为前景色，否则设置为背景色
* BufferedImage 的 setRGB(int x, int y, int rgb) 方法设置图像像素
* x：像素位置的横坐标，即列
* y：像素位置的纵坐标，即行
* rgb：像素的值，采用 16 进制,如 0xFFFFFF 白色
*/
BitMatrix bm = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints);
// 创建一个图片缓冲区存放二维码图片
BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
// 开始利用二维码数据创建Bitmap图片，分别设为黑（0xFFFFFFFF）白（0xFF000000）两色
for (int x = 0; x < WIDTH; x++) {
for (int y = 0; y < HEIGHT; y++) {
image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
}
}
int height = image.getHeight();
// ------------------------------------------自定义文本描述-------------------------------------------------
if (!StringUtils.isEmpty(sampleCode)) {
// 1、在内存创建图片缓冲区 这里设置画板的宽高和类型
BufferedImage outImage = new BufferedImage(500, 180, BufferedImage.TYPE_4BYTE_ABGR);
// 2、创建画布，获取图像对象
Graphics2D outg = outImage.createGraphics();
// 3、抗锯齿，防止模糊
RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
rh.put(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
rh.put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);
outg.setRenderingHints(rh);
// 4、在画布上画上二维码 X轴Y轴，宽度高度（X轴贴最右侧 500 - WIDTH）
outg.drawImage(image, 500 - WIDTH, 0, image.getWidth(), image.getHeight(), null);
// 设置文字颜色为黑色
outg.setColor(Color.BLACK);
// 字体、字型、字号
outg.setFont(font);
// 获取字体宽度
int codeWidth = outg.getFontMetrics().stringWidth(sampleCode);
int nameWidth = outg.getFontMetrics().stringWidth(sampleName);
// drawString(文字信息、x轴、y轴)方法根据参数设置文字的坐标轴 ，根据需要来进行调整
outg.drawString("样品编号: " + sampleCode, 20, 30);
outg.drawString("样品名称: " + sampleName, 20, 60);
outg.drawString("样品状态: □收样完好 □待检", 20, 90);
outg.drawString("□在检 □已检 □留样", 20, 120);
// 例： outg.drawString(depatmentName, 65 - strWidth / 2, height + (outImage.getHeight() - height) / 2 - h3); 根据需求自行计算需要的宽高
outg.dispose();
outImage.flush();
image = outImage;
}
image.flush();
return image;
}
public static void drawLogoQRCode() {
UserPo po = new UserPo();
po.setUserId(UUID.randomUUID().toString());
po.setExtend1(po.getUserId());
po.setExtend2("ZS001");
po.setExtend3("张三");
FileOutputStream fileOutputStream = null;
try {
// 保存路径输出流，将图片输出到指定路径
fileOutputStream = new FileOutputStream("D:" + File.separator + "var" + File.separator + po.getUserId() + ".png");
Font fontChinese = new Font("黑体", Font.PLAIN, 18);
BufferedImage image = createQr(po, fontChinese);
boolean createQRCode = ImageIO.write(image, "png", fileOutputStream);
} catch (WriterException | IOException e) {
log.error("二维码写入IO流异常", e);
} finally {
try {
if (null != fileOutputStream){
fileOutputStream.flush();
fileOutputStream.close();
}
} catch (IOException ioe){
log.error("二维码关流异常", ioe);
}
}
}
private static final String QR_CODE_IMAGE_PATH = "D:\\var\\hello world.png";
public static void test1() throws Exception {
// QrCodeUtil.generateQrCodeAndSave("hello world", "png", 350, 350, QR_CODE_IMAGE_PATH);
byte[] b = QrCodeUtil.generateQrCode("29B09FCD-65DC-4FCD-A4A4-6E79E7A2F56C", "png", 350, 350);
ByteArrayInputStream stream = new ByteArrayInputStream(b);
BufferedImage img = ImageIO.read(stream);
try {
File file = new File("D:\\var\\hello world.png");
ImageIO.write(img, "png", file);
} catch (IOException e) {
e.printStackTrace();
} finally {
stream.close();
}
}
public static void test2() throws Exception {
QrCodeUtil.generateQrCodeAndSave("hello world", "png", 350, 350, QR_CODE_IMAGE_PATH);
}
public static void main(String[] args) throws Exception {
// test1();
// test2();
drawLogoQRCode();
}
}
二维码.png
