ExcelUtils

本ExcelUtils工具类是用poi写的，仅用于线下从excel文件中读取数据。如果生产环境要用的话，建议切换到阿里的easyexcel。

引入poi.jar：

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.1</version>
</dependency>

ExcelUtils：

import java.io.FileInputStream;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelUtils {
    public static void readExcel(String sourceFilePath) {
        Workbook workbook = null;
        StringBuilder sb = new StringBuilder();
        try {
            workbook = getReadWorkBookType(sourceFilePath);
            //获取第一个sheet
            Sheet sheet = workbook.getSheetAt(0);
            //第一行是表头，从第二行开始读取
            for (int rowNum = 1; rowNum <= sheet.getLastRowNum(); rowNum++) {
                Row row = sheet.getRow(rowNum);
                Cell cell = row.getCell(0);
                sb.append(getCellStringVal(cell).trim());
            }
        } finally {
            IOUtils.closeQuietly(workbook);
        }
        System.out.println(sb.toString());
    }

    private static String getCellStringVal(Cell cell) {
        CellType cellType = cell.getCellTypeEnum();
        switch (cellType) {
            case NUMERIC:
                return cell.getStringCellValue();
            case STRING:
                return cell.getStringCellValue();
            case BOOLEAN:
                return String.valueOf(cell.getBooleanCellValue());
            case FORMULA:
                return cell.getCellFormula();
            case BLANK:
                return "";
            case ERROR:
                return String.valueOf(cell.getErrorCellValue());
            default:
                return StringUtils.EMPTY;
        }
    }

    private static Workbook getReadWorkBookType(String filePath) {
        FileInputStream is = null;
        try {
            is = new FileInputStream(filePath);
            if (filePath.toLowerCase().endsWith("xlsx")) {
                return new XSSFWorkbook(is);
            } else {
                return new HSSFWorkbook(is);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            IOUtils.closeQuietly(is);
        }
        return null;
    }

    public static void main(String[] args) {
        readExcel("/Users/koushengrui/Desktop/ksPhotoId.xlsx");
    }
}