spingboot 实现导入excel数据生成二维码

摘要

这次分享给大家的是，如何将导入的excel数据，将某些字段生成base64位的二维码。

效果图

后台开发

1、pom.xml 相关jar引入

2、代码

@PostMapping("/importData")
@ResponseBody
public AjaxResult importData(MultipartFile file, boolean updateSupport, String code) throws Exception
{
    System.out.println(code);
    ExcelUtil<SqJcitem> util = new ExcelUtil<SqJcitem>(SqJcitem.class);
    List<SqJcitem> userList = util.importExcel(file.getInputStream());

    Date date= new Date();
    SimpleDateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd");
    String time=dateFormat.format(date);
    System.out.println("---"+time);
    for(int  i=0;i<userList.size();i++)
    {
        if(StringUtils.isNotBlank(userList.get(i).getCode()))
        {
            SqJcitem n=userList.get(i);
        List<SqJcitem>  sqjcitemList=  sqjcitemDao.listByCode(n.getCode());
        if(sqjcitemList.size()==0)
        {
            SqJcitem sqjcitem=new SqJcitem();
               sqjcitem.setCode(code+"-"+n.getCode()+"-"+n.getJcode()+"-"+time);
               sqjcitem.setItems(n.getItems());
               sqjcitem.setItemsname(n.getItemsname());
               sqjcitem.setMethodcode(n.getMethodcode());
               sqjcitem.setMethondname(n.getMethondname());
               sqjcitem.setFxitems(n.getFxitems());
               sqjcitem.setImg(QrCodeUtils.creatRrCode(sqjcitem.getCode(), 200,200));//生成base64的二维码
               sqjcitemDao.insert(sqjcitem);

        }
        }
    }


    return AjaxResult.success("");
}

工具类 QrCodeUtils

package com.stylefeng.guns.modular.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import sun.misc.BASE64Encoder;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Hashtable;

public class QrCodeUtils {
    public static String creatRrCode(String contents, int width, int height) {
        String binary = null;
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(
                    contents, BarcodeFormat.QR_CODE, width, height, hints);
            // 1、读取文件转换为字节数组
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            BufferedImage image = toBufferedImage(bitMatrix);
            //转换成png格式的IO流
            ImageIO.write(image, "png", out);
            byte[] bytes = out.toByteArray();

            // 2、将字节数组转为二进制
            BASE64Encoder encoder = new BASE64Encoder();
            binary = encoder.encodeBuffer(bytes).trim();
        } catch (WriterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return binary;
    }

    /**
     * image流数据处理
     *
     * @author ianly
     */
    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.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, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        return image;
    }


    public static void main(String[] args) {
        String binary = QrCodeUtils.creatRrCode("https://blog.csdn.net/ianly123", 200,200);
        System.out.println(binary);
    }
}