校验文件是否是Excel文件

一、从excel里导入数据，首先是判断文件是否是一个excel文件

import java.io.InputStream;
import java.text.DecimalFormat;
import java.util.Objects;

import org.apache.poi.poifs.filesystem.FileMagic;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.springframework.web.multipart.MultipartFile;

public static boolean isExcelFile(InputStream inputStream) {
        boolean result = false;
        try {
            FileMagic fileMagic = FileMagic.valueOf(inputStream);
            if (Objects.equals(fileMagic, FileMagic.OLE2)
                || Objects.equals(fileMagic, FileMagic.OOXML)) {
                result = true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;

    }

pom  poi 至少是3。17

<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>

参考：https://blog.csdn.net/luoyanjiewade/article/details/85268966