引入pom
<!--二维码依赖-->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.3</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.3</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.28</version>
<scope>provided</scope>
</dependency>
核心方法
private static final int QRCODE_SIZE = 320; // 二维码尺寸，宽度和高度均是320
private static final String FORMAT_TYPE = "PNG"; // 二维码图片类型
/**
* 获取二维码图片
*
* @param dataStr 二维码内容
* @param needLogo 是否需要添加logo
* @param bottomText 底部文字 为空则不显示
* @return
*/
@SneakyThrows
public static BufferedImage getQRCodeImage(String dataStr, boolean needLogo, String bottomText) {
if (dataStr == null) {
throw new RuntimeException("未包含任何信息");
}
HashMap<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); //定义内容字符集的编码
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); //定义纠错等级
hints.put(EncodeHintType.MARGIN, 1);
QRCodeWriter qrCodeWriter = new QRCodeWriter();
BitMatrix bitMatrix = qrCodeWriter.encode(dataStr, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.getHeight();
int tempHeight = height;
if (StringUtils.hasText(bottomText)) {
tempHeight = tempHeight + 12;
}
BufferedImage image = new BufferedImage(width, tempHeight, 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);
}
}
// 判断是否添加logo
if (needLogo) {
insertLogoImage(image);
}
// 判断是否添加底部文字
if (StringUtils.hasText(bottomText)) {
addFontImage(image, bottomText);
}
return image;
}
/**
* 插入logo图片
*
* @param source 二维码图片
* @throws Exception
*/
private static void insertLogoImage(BufferedImage source) throws Exception {
// 默认logo放于resource/static/目录下
ClassPathResource classPathResource = new ClassPathResource("static/xbk.jpg");
InputStream inputStream = classPathResource.getInputStream();
if (inputStream == null || inputStream.available() == 0) {
return;
}
Image src = ImageIO.read(inputStream);
int width = 30;
int height = 30;
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_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();
}
private static void addFontImage(BufferedImage source, String declareText) {
//生成image
int defineWidth = QRCODE_SIZE;
int defineHeight = 20;
BufferedImage textImage = new BufferedImage(defineWidth, defineHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) textImage.getGraphics();
//开启文字抗锯齿
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2.setBackground(Color.WHITE);
g2.clearRect(0, 0, defineWidth, defineHeight);
g2.setPaint(Color.BLACK);
FontRenderContext context = g2.getFontRenderContext();
//部署linux需要注意 linux无此字体会显示方块,传入null选择默认字体
Font font = new Font(null, Font.BOLD, 15);
g2.setFont(font);
LineMetrics lineMetrics = font.getLineMetrics(declareText, context);
FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font);
float offset = (defineWidth - fontMetrics.stringWidth(declareText)) / 2;
float y = (defineHeight + lineMetrics.getAscent() - lineMetrics.getDescent() - lineMetrics.getLeading()) / 2;
g2.drawString(declareText, (int) offset, (int) y);
Graphics2D graph = source.createGraphics();
//开启文字抗锯齿
graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
//添加image
int width = textImage.getWidth(null);
int height = textImage.getHeight(null);
Image src = textImage;
graph.drawImage(src, 0, QRCODE_SIZE - 8, width, height, Color.WHITE, null);
graph.dispose();
}
其中logo图片存放的路径为：resource/static/
调用
import lombok.SneakyThrows;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.util.HashMap;
import java.util.Map;
@Controller
@RequestMapping("/qrcode")
public class QrCodeController {
//1、生成带logo和底部文字得二维码
@SneakyThrows
@GetMapping("/getQrCode1")
public void getQrCode1(HttpServletResponse response) {
String content="test";
String bottomTxt="01";
ServletOutputStream os = response.getOutputStream();
BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,true,bottomTxt);
response.setContentType("image/png");
ImageIO.write(bufferedImage,"png",os);
}
//2、生成不带logo和带底部文字的二维码
@SneakyThrows
@GetMapping("/getQrCode2")
public void getQrCode2(HttpServletResponse response) {
String content="test";
ServletOutputStream os = response.getOutputStream();
BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,false,null);
response.setContentType("image/png");
ImageIO.write(bufferedImage,"png",os);
}
//3、生成默认带logo不带底部文字得二维码
@SneakyThrows
@GetMapping("/getQrCode3")
public void getQrCode3(HttpServletResponse response) {
String content="test";
ServletOutputStream os = response.getOutputStream();
BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,true,null);
response.setContentType("image/png");
ImageIO.write(bufferedImage,"png",os);
}
//3、生成不带logo带底部文字得二维码
@SneakyThrows
@GetMapping("/getQrCode4")
public void getQrCode4(HttpServletResponse response) {
String content="test";
String bottomTxt="01";
ServletOutputStream os = response.getOutputStream();
BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,false,bottomTxt);
response.setContentType("image/png");
ImageIO.write(bufferedImage,"png",os);
}
//5、生成不带logo带底部文字的二维码，返回base64
@SneakyThrows
@GetMapping("/getQrCode5")
@ResponseBody
public Object getQrCode5() {
String content="test";
String bottomTxt="01";
BufferedImage bufferedImage = QRCodeUtil.getQRCodeImage(content,false,bottomTxt);
ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流
ImageIO.write(bufferedImage, "png", baos);//写入流中
byte[] bytes = baos.toByteArray();//转换成字节
BASE64Encoder encoder = new BASE64Encoder();
String png_base64 = encoder.encodeBuffer(bytes).trim();//转换成base64串
png_base64 = png_base64.replaceAll("\n", "").replaceAll("\r", "");//删除 \r\n
String generateQrCode="data:image/jpg;base64," + png_base64;
Map<String,String> map = new HashMap<>();
map.put("generateQrCode",generateQrCode);
return map;
}
}
