java 導入Excel

import com.alibaba.fastjson.JSON;
import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
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;

import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class InEcxelUtils {
    private static final Logger logger = Logger.getLogger(InEcxelUtils.class);

    private final static String excel2003L = ".xls";    //2003- 版本的excel
    private final static String excel2007U = ".xlsx";   //2007+ 版本的excel

    /**
     * 將流中的Excel數據轉成List<Map>
     *
     * @param in
     *            輸入流
     * @param fileName
     *            文件名（判斷Excel版本）
     * @param
     *
     * @return
     * @throws Exception
     */
    public static List<Map<String, Object>> parseExcel(InputStream in, String fileName) throws Exception {
        // 根據文件名來創建Excel工作薄
        Workbook work = getWorkbook(in, fileName);
        if (null == work) {
            throw new Exception("創建Excel工作薄爲空！");
        }
        Sheet sheet = null;
        Row row = null;
        Cell cell = null;
        // 返回數據
        List<Map<String, Object>> ls = new ArrayList<Map<String, Object>>();

        // 遍歷Excel中所有的sheet
        for (int i = 0; i < work.getNumberOfSheets(); i++) {
            sheet = work.getSheetAt(i);
            if (sheet == null)
                continue;

            // 取第一行標題
            row = sheet.getRow(0);
            String title[] = null;
            if (row != null) {
                title = new String[row.getLastCellNum()];

                for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
                    cell = row.getCell(y);
                    title[y] = (String) getCellValue(cell);
                }

            } else
                continue;
            logger.info(JSON.toJSONString(title));

            // 遍歷當前sheet中的所有行
            for (int j = 1; j < sheet.getLastRowNum() + 1; j++) {
                row = sheet.getRow(j);
                Map<String, Object> m = new HashMap<String, Object>();
                // 遍歷所有的列
                for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
                    cell = row.getCell(y);
                    String key = title[y];
                    m.put(key, getCellValue(cell));
                }
                ls.add(m);
            }

        }
        work.close();
        return ls;
    }

    /**
     * 描述：根據文件後綴，自適應上傳文件的版本
     *
     * @param inStr
     *            ,fileName
     * @return
     * @throws Exception
     */
    public static Workbook getWorkbook(InputStream inStr, String fileName) throws Exception {
        Workbook wb = null;
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        if (excel2003L.equals(fileType)) {
            wb = new HSSFWorkbook(inStr); // 2003-
        } else if (excel2007U.equals(fileType)) {
            wb = new XSSFWorkbook(inStr); // 2007+
        } else {
            throw new Exception("解析的文件格式有誤！");
        }
        return wb;
    }

    /**
     * 描述：對錶格中數值進行格式化
     *
     * @param cell
     * @return
     */
    public static Object getCellValue(Cell cell) {
        Object value = null;
        DecimalFormat df = new DecimalFormat("0"); // 格式化number String字符
        SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd"); // 日期格式化
        DecimalFormat df2 = new DecimalFormat("0"); // 格式化數字

        switch (cell.getCellType()) {
            case Cell.CELL_TYPE_STRING:
                value = cell.getRichStringCellValue().getString();
                break;
            case Cell.CELL_TYPE_NUMERIC:
                if ("General".equals(cell.getCellStyle().getDataFormatString())) {
                    value = df.format(cell.getNumericCellValue());
                } else if ("m/d/yy".equals(cell.getCellStyle().getDataFormatString())) {
                    value = sdf.format(cell.getDateCellValue());
                } else {
                    value = df2.format(cell.getNumericCellValue());
                }
                break;
            case Cell.CELL_TYPE_BOOLEAN:
                value = cell.getBooleanCellValue();
                break;
            case Cell.CELL_TYPE_BLANK:
                value = "";
                break;
            default:
                break;
        }
        return value;
    }


}

maven倉庫

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.16</version>
</dependency>