利用阿里easyexcel 将excel文件批量导入数据库

 easyexcel是阿里开源的excel解析工具，相对比其他组建poi , jxl 它对内存溢出有很好的决绝方案！

1.  首先下载easyexcel的依赖包：

---

   com.alibaba
   easyexcel
   1.1.2-beta4

注解：如果在运行的时候还缺包加入这个包

   org.apache.poi
   poi
   3.17



   org.apache.poi
   poi-ooxml
   3.17

---

2. 读取Excel信息代码

import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.*;

/**
 * Excel处理工具
 * @Author: zhaiyh
 * @Date: 2019/6/25 21:11
 */
public class ExcelUtil {
    /**
     * 读取 Excel(多个 sheet)
     *
     * @param excel    文件
     * @param rowModel 实体类映射，继承 BaseRowModel 类
     * @return Excel 数据 list
     */
    public static ResultInfo readExcel(MultipartFile excel, BaseRowModel rowModel) {
        ExcelListener excelListener = new ExcelListener();
        ExcelReader reader = getReader(excel, excelListener);
        if (reader == null) {
            return null;
        }
        for (Sheet sheet : reader.getSheets()) {
            if (rowModel != null) {
                sheet.setClazz(rowModel.getClass());
            }
            reader.read(sheet);
        }
        return excelListener.getDatas();
    }

    /**
     * 读取某个 sheet 的 Excel
     *
     * @param excel    文件
     * @param rowModel 实体类映射，继承 BaseRowModel 类
     * @param sheetNo  sheet 的序号 从1开始
     * @return Excel 数据 list
     */
    public static ResultInfo readExcel(MultipartFile excel, BaseRowModel rowModel, int sheetNo) {
        return readExcel(excel, rowModel, sheetNo, 1);
    }

    /**
     * 读取某个 sheet 的 Excel
     *
     * @param excel       文件
     * @param rowModel    实体类映射，继承 BaseRowModel 类
     * @param sheetNo     sheet 的序号 从1开始
     * @param headLineNum 表头行数，默认为1
     * @return Excel 数据 list
     */
    public static ResultInfo readExcel(MultipartFile excel, BaseRowModel rowModel, int sheetNo,
                                         int headLineNum) {
        ExcelListener excelListener = new ExcelListener();
        ExcelReader reader = getReader(excel, excelListener);
        if (reader == null) {
            return null;
        }
        reader.read(new Sheet(sheetNo, headLineNum, rowModel.getClass()));
        return excelListener.getDatas();
    }

    /**
     * 导出文件时为Writer生成OutputStream
     */
    private static OutputStream getOutputStream(String fileName, HttpServletResponse response) {
        //创建本地文件
        String filePath = fileName + ".xlsx";
        File dbfFile = new File(filePath);
        try {
            if (!dbfFile.exists() || dbfFile.isDirectory()) {
                dbfFile.createNewFile();
            }
            fileName = new String(filePath.getBytes(), "ISO-8859-1");
            response.addHeader("Content-Disposition", "filename=" + fileName);
            return response.getOutputStream();
        } catch (IOException e) {
            throw new ExcelException("创建文件失败！");
        }
    }

    /**
     * 返回 ExcelReader
     *
     * @param excel         需要解析的 Excel 文件
     * @param excelListener new ExcelListener()
     */
    private static ExcelReader getReader(MultipartFile excel,
                                         ExcelListener excelListener) {
        String filename = excel.getOriginalFilename();
        if (filename == null || (!filename.toLowerCase().endsWith(".xls") && !filename.toLowerCase().endsWith(".xlsx"))) {
            throw new ExcelException("文件格式错误！");
        }
        InputStream inputStream;
        try {
            inputStream = new BufferedInputStream(excel.getInputStream());
            return new ExcelReader(inputStream, null, excelListener, false);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

3、将监听的信息进行处理

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.ijovo.billionbottle.util.BStringUtils;

import java.util.ArrayList;
import java.util.List;
/**
 * Excel文档导入监控
 * @Author: zhaiyh
 * @Date: 2019/6/25 21:11
 */
public class ExcelListener extends AnalysisEventListener {

    //自定义用于暂时存储data。
    //可以通过实例获取该值
    private List