        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>

第二步實現(xiàn)測試類+測試

創(chuàng)建ReloadExcelTest .java文件
此時找到excel的文件路徑，寫文件全名：路徑+文件全名
例：String reloadPath=“D:\ExcelTest\test.xlsx”;
windows路徑之間加\\
測試

package tech.niua.admin.outputvalue.util.reloadexcel;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import tech.niua.admin.outputvalue.domain.OutputValue;
import java.io.IOException;
public class ReloadExcelTest {
    public static void readExcel(String reloadPath) throws IOException {
        //1.獲取工作簿
        XSSFWorkbook workbook = new XSSFWorkbook(reloadPath);
        //2.獲取工作表
        XSSFSheet sheet = workbook.getSheetAt(0);
        //獲取行
        //cell.setCellType(Cell.CELL_TYPE_STRING);    //將不同類型的數(shù)據(jù)類型轉為String
        int lastRowNum = sheet.getLastRowNum();
        for (int i = 1; i <= lastRowNum; i++) {
            OutputValue outputValueEntity = OutputValue.builder().build();
            Row rowValue = sheet.getRow(i);
            //獲取每一行中每一個單元格的數(shù)據(jù)的數(shù)據(jù)
            for (int j = 0; j < 4; j++) {
                DataFormatter formatter = new DataFormatter();
                String value = formatter.formatCellValue(rowValue.getCell(j));
                System.out.print(value+" ");
            }
            System.out.println();
        }
    }
}

注意：4.1.2版本的poi已經不在使用cell.setCellType(Cell.CELL_TYPE_STRING);這種對于讀取到數(shù)據(jù)設置為String類型的這種形式，將不再支持

改用為：

DataFormatter formatter = new DataFormatter();

String value = formatter.formatCellValue(rowValue.getCell(j));

此時value就是我們讀取到的值，可以做一個相應的轉換存儲到集合或者對象的形式接收

測試

    public static void main(String[] args) throws IOException {
        String reloadPath="D:\\ExcelTest\\test.xlsx";
        ReloadExcelTest.readExcel(reloadPath);
    }