共计 6617 个字符，预计需要花费 17 分钟才能阅读完成。
引入 Google Zxing jar 包
<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>工具类
package com.sunlands.feo.school.candlestick.utils;
import com.google.zxing.*;
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;
import org.springframework.stereotype.Component;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
/**
* @author dongxie
*/
@Component
public class QrCodeUtils {
private static final String CHARSET = "UTF-8";
private static final String FORMAT_NAME = "JPG";
/**
* 二维码尺寸
*/
private static final int QRCODE_SIZE = 300;
/**
* LOGO 宽度
*/
private static final int WIDTH = 60;
/**
* LOGO 高度
*/
private static final int HEIGHT = 60;
/**
* 创立二维码图片
*
* @param content 内容
* @param logoPath logo
* @param isCompress 是否压缩 Logo
* @return 返回二维码图片
* @throws WriterException e
* @throws IOException BufferedImage
*/
public static BufferedImage createImage(String content, String logoPath, boolean isCompress) throws WriterException, IOException {Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, 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
QrCodeUtils.insertImage(image, logoPath, isCompress);
return image;
}
/**
* 增加 Logo
*
* @param source 二维码图片
* @param logoPath Logo
* @param isCompress 是否压缩 Logo
* @throws IOException void
*/
private static void insertImage(BufferedImage source, String logoPath, boolean isCompress) throws IOException {File file = new File(logoPath);
if (!file.exists()) {return;}
Image src = ImageIO.read(new File(logoPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
// 压缩 LOGO
if (isCompress) {if (width > WIDTH) {width = WIDTH;}
if (height > HEIGHT) {height = HEIGHT;}
Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
// 绘制放大后的图
g.drawImage(image, 0, 0, null);
g.dispose();
src = image;
}
// 插入 LOGO
Graphics2D graph = source.createGraphics();
int x = (QRCODE_SIZE - width) / 2;
int y = (QRCODE_SIZE - 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
*
* @param content 二维码内容
* @param logoPath Logo
* @param destPath 二维码输入门路
* @param isCompress 是否压缩 Logo
* @throws Exception void
*/
public static void create(String content, String logoPath, String destPath, boolean isCompress) throws Exception {BufferedImage image = QrCodeUtils.createImage(content, logoPath, isCompress);
mkdirs(destPath);
ImageIO.write(image, FORMAT_NAME, new File(destPath));
}
/**
* 生成不带 Logo 的二维码
*
* @param content 二维码内容
* @param destPath 二维码输入门路
*/
public static void create(String content, String destPath) throws Exception {QrCodeUtils.create(content, null, destPath, false);
}
/**
* 生成带 Logo 的二维码，并输入到指定的输入流
*
* @param content 二维码内容
* @param logoPath Logo
* @param output 输入流
* @param isCompress 是否压缩 Logo
*/
public static void create(String content, String logoPath, OutputStream output, boolean isCompress) throws Exception {BufferedImage image = QrCodeUtils.createImage(content, logoPath, isCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
/**
* 生成不带 Logo 的二维码，并输入到指定的输入流
*
* @param content 二维码内容
* @param output 输入流
* @throws Exception void
*/
public static void create(String content, OutputStream output) throws Exception {QrCodeUtils.create(content, null, output, false);
}
/**
* 二维码解析
*
* @param file 二维码
* @return 返回解析失去的二维码内容
* @throws Exception String
*/
public static String parse(File file) throws Exception {
BufferedImage image;
image = ImageIO.read(file);
if (image == null) {return null;}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();}
/**
* 二维码解析
*
* @param path 二维码存储地位
* @return 返回解析失去的二维码内容
* @throws Exception String
*/
public static String parse(String path) throws Exception {return QrCodeUtils.parse(new File(path));
}
/**
* 判断门路是否存在，如果不存在则创立
*
* @param dir 目录
*/
public static void mkdirs(String dir) {if (dir != null && !"".equals(dir)) {File file = new File(dir);
if (!file.isDirectory()) {file.mkdirs();
}
}
}
}应用
package com.jiafly.blueberry.controller;
import com.jiafly.blueberry.common.utils.QrCodeUtils;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
/**
* 二维码
*
* @author dongxie
*/
@RestController
@RequestMapping(path = "/qrcode")
public class QrCodeController {@GetMapping(path = "/create")
public void image(HttpServletResponse response, @RequestParam("content") String content) {
try {BufferedImage bufferedImage = QrCodeUtils.createImage(content, null, false);
responseImage(response, bufferedImage);
} catch (Exception e) {
// 异样自行处理，应用程序切忌间接打印堆栈日志，难定位
e.printStackTrace();}
}
/**
* 设置 可通过 postman 或者浏览器间接浏览
*
* @param response response
* @param bufferedImage bufferedImage
* @throws Exception e
*/
public void responseImage(HttpServletResponse response, BufferedImage bufferedImage) throws Exception {ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ImageOutputStream imageOutput = ImageIO.createImageOutputStream(byteArrayOutputStream);
ImageIO.write(bufferedImage, "jpeg", imageOutput);
InputStream inputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
OutputStream outputStream = response.getOutputStream();
response.setContentType("image/jpeg");
response.setCharacterEncoding("UTF-8");
IOUtils.copy(inputStream, outputStream);
outputStream.flush();}
}
正文完
