抽取方法:生成二维码;下载excel文件

liuxm

2024-05-21 a816065c4c3bdbd353f5ad3020bb2848c6c55af0

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package com.dy.pmsGlobal.util;
 
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.converters.Converter;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.dy.common.util.QrCodeGenerator;
import com.google.zxing.WriterException;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.ClassPathResource;
 
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
@Slf4j
public class QrCodeUtil {
    private static final ConcurrentHashMap<String, File> logoCache = new ConcurrentHashMap<>();
    private static final String LOGO_PATH = "/images/logo.png";
 
 
    /**
     * 生成带Logo的二维码图片字节数组。
     * @param code 二维码内容
     * @return 二维码图片的字节数组
     * @throws IOException IO异常
     * @throws WriterException 二维码生成异常
     */
    public static byte[] genQrCode(String code) throws IOException, WriterException {
        File logoFile = logoCache.computeIfAbsent(LOGO_PATH, key -> {
            try {
                ClassPathResource resource = new ClassPathResource(key);
                return resource.getFile();
            } catch (IOException e) {
                throw new RuntimeException("加载Logo图片失败", e);
            }
        });
 
        BufferedImage qrCodeImage = QrCodeGenerator.toBufferedImage(QrCodeGenerator.createBitMatrix(code, QrCodeConstant.MarkQrCodeWidth, QrCodeConstant.MarkQrCodeHeight));
        if (logoFile != null) {
            qrCodeImage = QrCodeGenerator.addQrCodeLogo(qrCodeImage, logoFile);
        }
        return QrCodeGenerator.bufferedImageToByteArray(qrCodeImage, "JPEG");
    }
 
    public static void downloadExcel(HttpServletResponse response, String fileName, String sheetName, List<Converter> list){
        if(CollectionUtils.isEmpty(list)){
            return;
        }
        try{
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            response.setCharacterEncoding("utf-8");
            fileName = URLEncoder.encode(fileName, "UTF-8").replaceAll("\\+", "%20");
            response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
            EasyExcel.write(response.getOutputStream(), list.get(0).getClass()).sheet(sheetName).doWrite(list);
            EasyExcel.write(response.getOutputStream(), Converter.class).sheet(sheetName).doWrite(list);
        }catch (Exception e){
            log.error("导出产品信息异常", e);
        }
    }
}