寫的比較簡單，可以直接用，拿去按自己專案需求稍微修改下就可以了。直接上程式碼吧，

package com;

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.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

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

/**
 * 2 * @Author: ponyWang
 * 3 * @Date: 2018/6/12 11:56
 * 4
 */
public class ExcelUpload {
    public List<Map> excelUpload(File file) throws IOException {
        InputStreamReader reader = new InputStreamReader(
                new FileInputStream(file));
        Workbook workbook = null;
        try {
            workbook = new HSSFWorkbook(new FileInputStream(file));//2003版本
        } catch (Exception ex) {
            workbook = new XSSFWorkbook(new FileInputStream(file));//2007版本
        }
        Sheet sheet =workbook.getSheetAt(0); //暫時只做了第一頁
        int rowNum = sheet.getLastRowNum();//總行數
        Row row = sheet.getRow(0);//第一列
        Short cloumns = row.getLastCellNum();
        int cloumnNum = cloumns;//總列數

        List<String> header = new ArrayList();//表頭資料
        for (int i = 0 ; i < cloumnNum ; i++){
            Cell cell = row.getCell(i);
            if (cell == null){
                //return "第"+i+1+"行表頭不能為空";
                System.out.println("第"+i+1+"行表頭不能為空");
            }
            header.add(cell.getStringCellValue());
        }
        List result = new ArrayList();
        DecimalFormat decimalFormat = new DecimalFormat("#0.00");
        //迴圈讀取表格內容
        for (int j = 1 ;j <= rowNum ; j++){
            List currentRowList = new ArrayList();
            Row  currentRow = sheet.getRow(j);
            Map rowMap = new HashMap();
            for (int k = 0 ; k < cloumnNum ; k++){
                String key = header.get(k);
                if (currentRow == null){
                    break;
                }
                Cell cell = currentRow.getCell(k);
                if(cell != null){
                    String cellValue = "";
                    // 以下是判斷資料的型別
                    switch (cell.getCellType())
                    {
                        case HSSFCell.CELL_TYPE_NUMERIC: // 數字
                            cellValue = decimalFormat.format(cell.getNumericCellValue());

                            double numericCellValue = cell.getNumericCellValue();
                            long inVal = Math.round(numericCellValue);
                            if (numericCellValue - inVal == 0) {
                                cellValue = inVal+"";
                            }
                            break;

                        case HSSFCell.CELL_TYPE_STRING: // 字串
                            cellValue = cell.getStringCellValue();
                            break;

                        case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
                            cellValue = cell.getBooleanCellValue() + "";
                            break;

                        case HSSFCell.CELL_TYPE_FORMULA: // 公式
                            cellValue = cell.getCellFormula() + "";
                            break;

                        case HSSFCell.CELL_TYPE_BLANK: // 空值
                            cellValue = "";
                            break;

                        case HSSFCell.CELL_TYPE_ERROR: // 故障
                            cellValue = "非法字元";
                            break;

                        default:
                            cellValue = "未知型別";
                            break;
                    }

                    rowMap.put(key,cellValue);
                }
            }
            if(rowMap.size() != 0){
                currentRowList.add(rowMap);
                result.add(currentRowList);
            }
        }
        return result;
    }


    public static void main(String[] args) throws IOException {
        File  file = new File("C:\\Users\\Singing\\Desktop\\2017-04-16.xlsx");
        ExcelUpload instance = new ExcelUpload();
        List result= instance.excelUpload(file);
        System.out.println(result);
    }
}
 

maven依賴

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.10-FINAL</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.10-FINAL</version>
        </dependency>
 

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修改了一下，解決了整形匯入會變浮點型的問題