62 lines
2.3 KiB
Java
62 lines
2.3 KiB
Java
package com.utils;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.EncodeHintType;
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import com.google.zxing.client.j2se.MatrixToImageWriter;
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import com.google.zxing.common.BitMatrix;
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import com.google.zxing.qrcode.QRCodeWriter;
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import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
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import org.apache.commons.codec.binary.Base64;
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import org.springframework.stereotype.Component;
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import org.springframework.util.StringUtils;
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import javax.imageio.ImageIO;
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import javax.servlet.ServletOutputStream;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.HashMap;
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/**
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* @description:
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* @author: Administrator
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* @date: 2019-03-18 10:40
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*/
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@Component
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public class QRCodeUtil {
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public static String crateQRCode(String content, int width, int height) throws IOException {
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String resultImage = "";
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if (!StringUtils.isEmpty(content)) {
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ServletOutputStream stream = null;
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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@SuppressWarnings("rawtypes")
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HashMap<EncodeHintType, Comparable> hints = new HashMap<>();
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hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 指定字符编码为“utf-8”
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hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 指定二维码的纠错等级为中级
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hints.put(EncodeHintType.MARGIN, 2); // 设置图片的边距
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try {
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QRCodeWriter writer = new QRCodeWriter();
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BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
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BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
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ImageIO.write(bufferedImage, "png", os);
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/**
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* 原生转码前面没有 data:image/png;base64 这些字段，返回给前端是无法被解析，可以让前端加，也可以在下面加上
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*/
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return CrmebUtil.getBase64Image(Base64.encodeBase64String(os.toByteArray()));
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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if (stream != null) {
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stream.flush();
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stream.close();
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}
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}
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}
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return null;
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}
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} |