java生成二维码以及链接邀请


<img src="/cn-user/inviter-code-image.html?width=130&inviterCode=<s:property value="inviterURL"/>">

导包：

   <dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId></dependency>

使用教程：

    public String inviterCodeImage() {try {if (width <= 0) {width = 200;}var response = ServletActionContext.getResponse();///cn-user/inviter-code-image.html?width=130&inviterCode=https://www.medchemexpress.cn/integral-invitation-code-form.html?inviter-code=847231841027573182527186725995//inviterCode为二维码扫描内容 width为宽度byte[] bs = ImageUtils.createQRCodeImage(inviterCode, width);response.setHeader("Cache-Control", "no-store");response.setContentType("image/png");response.setContentLength(bs.length);response.getOutputStream().write(bs);} catch (Exception e) {e.printStackTrace();}return null;}

工具类：

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import lombok.extern.slf4j.Slf4j;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.HashMap;
import java.util.Map;@Slf4j
public class ImageUtils {public static final String FORMAT_JPG = "jpg";public static final String FORMAT_PDF = "pdf";public static final String FORMAT_PNG = "png";public static final String FORMAT_GIF = "gif";public static final String FORMAT_BMP = "bmp";private ImageUtils() {}/*** 图片压缩* @param maxWidth* @param maxHeight* @param bytes* @return*/public static byte[] thumbnail(int maxWidth, int maxHeight, byte[] bytes) {var imageBuffer = new ByteArrayInputStream(bytes);BufferedImage srcImage;try {srcImage = ImageIO.read(imageBuffer);} catch (Exception ignore) {return null; // impossible}int srcWidth = srcImage.getWidth();int srcHeight = srcImage.getHeight();int thumbnailWidth = maxWidth;int thumbnailHeight = maxHeight;if (srcWidth >= srcHeight) {thumbnailHeight = thumbnailWidth * srcHeight / srcWidth;} else {thumbnailWidth = thumbnailHeight * srcWidth / srcHeight;}var thumbnailImage = new BufferedImage(thumbnailWidth, thumbnailHeight, BufferedImage.TYPE_INT_RGB);var thumbnailGraphics = thumbnailImage.createGraphics();try {var scaledImage = srcImage.getScaledInstance(thumbnailWidth, thumbnailHeight, Image.SCALE_SMOOTH);thumbnailGraphics.drawImage(scaledImage, 0, 0, thumbnailWidth, thumbnailHeight, null);} finally {thumbnailGraphics.dispose();}try (var outBuffer = new ByteArrayOutputStream()) {ImageIO.write(thumbnailImage, "png", outBuffer);return outBuffer.toByteArray();} catch (Exception ignore) {return null; // impossible}}/*** 获取图片后缀* @param bytes* @param defaultFormat* @return*/public static String getImageFormatName(byte[] bytes, String defaultFormat) {try {var imageStream = ImageIO.createImageInputStream(new ByteArrayInputStream(bytes));var readerIterator = ImageIO.getImageReaders(imageStream);if (readerIterator.hasNext()) {var reader = readerIterator.next();var format = reader.getFormatName().toLowerCase();// 文件格式名参考 PNGImageReaderSpi，大体可用，只是 JPG 搞特殊，额外处理一下if ("jpeg".equals(format)) {format = FORMAT_JPG;}return format;}} catch (Exception ignore) {}return defaultFormat;}/*** 创建二维码图片* @param text* @param width* @return*/public static byte[] createQRCodeImage(String text, int width) {var hints = new HashMap<EncodeHintType, Object>();hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);hints.put(EncodeHintType.MARGIN, 0);return createQRCodeImage(text, width, hints);}/*** 创建二维码图片* @param text* @param width* @param 二维码图片微调参数* @return*/public static byte[] createQRCodeImage(String text, int width, Map<EncodeHintType, Object> hints) {try {var writer = new QRCodeWriter();@SuppressWarnings("SuspiciousNameCombination")var matrix = writer.encode(text, BarcodeFormat.QR_CODE, width, width, hints);var buffer = new ByteArrayOutputStream();MatrixToImageWriter.writeToStream(matrix, "PNG", buffer);return buffer.toByteArray();} catch (Exception e) {log.error("create qrcode image", e);return new byte[0];}}
}

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