pom.xml

<!--利用poi 讀取excel-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.16</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.16</version>
        </dependency>


        <!-- https://
 
mvnrepository.com/artifact/commons-io/commons-io -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>

ExcelUtils.java

package
 
 com.kakaluote.common.utils;

import org.apache.commons.io.IOUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.util.StringUtils;

 
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by 敲程式碼的卡卡羅特
 * on 2018/11/19 22:12.
 */
public class ExcelUtils {
    //思路是按照Workbook，Sheet，Row，Cell一層一層往下讀取。首先是初始化Workbook
    public static Workbook getReadWorkBookType(String filePath) throws Exception{
        //xls-2003, xlsx-2007
        FileInputStream is = null;

        try {
            is = new FileInputStream(filePath);
            if (filePath.toLowerCase().endsWith("xlsx")) {
                return new XSSFWorkbook(is);
            } else if (filePath.toLowerCase().endsWith("xls")) {
                return new HSSFWorkbook(is);
            } else {
                //  丟擲自定義的業務異常
            }
        } catch (IOException e) {
        } finally {
            IOUtils.closeQuietly(is);
        }
        return null;
    }

    public static List<String> readExcel(String sourceFilePath) throws Exception {
        Workbook workbook = null;

        try {
            workbook = getReadWorkBookType(sourceFilePath);
            List<String> contents = new ArrayList<>();

            //獲取第一個sheet
            Sheet sheet = workbook.getSheetAt(0);
            //第0行是表名，忽略，從第二行開始讀取
            System.out.println(sheet.getLastRowNum());
            for (int rowNum = 1; rowNum <= sheet.getLastRowNum(); rowNum++) {
                Row row = sheet.getRow(rowNum);
                Cell cell=null;
                short lastCellNum = row.getLastCellNum();
                for (int j=0;j<lastCellNum;j++){
                    cell = row.getCell(j);
                    System.out.println(getCellVal(cell).trim());
                }

                contents.add(getCellVal(cell).trim());
            }
            return contents;
        }catch (Exception e){
            System.out.println(e.getMessage());
        }
        return null;
    }
    /**
     * 獲取單元格的值
     *
     * @param cell
     * @return
     */
    //如果excel中的資料是數字，會發現java中對應的變成了科學計數法的，所以在獲取值的時候就要做一些特殊處理，這樣就能保證獲取的值是我想要的值。
    public static String getCellVal(Cell cell) {
        CellType cellType = cell.getCellTypeEnum();
        //System.out.println(cell.getStringCellValue());
        switch (cellType) {
            case NUMERIC:
                return cell.getNumericCellValue()+"";
            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 "";
        }
    }
    /**
     * 判斷是不是空白行  false表示是空白行，true表示不是空白行
     * @param row
     * @return
     */
    public static boolean isBlankLine(Row row){
        boolean flag=true;
        int i=0;
        if (row.getLastCellNum()==-1){
            flag=false;
            return flag;
        }
        for (int c = row.getFirstCellNum(); c < row.getLastCellNum(); c++) {
            Cell cell = row.getCell(c);
            if (cell == null || cell.getCellType() == Cell.CELL_TYPE_BLANK){
                i++;
                if (i==row.getLastCellNum()){
                    flag=false;
                    return flag;
                }

            }
        }
        return flag;
    }

    /**
     * 判斷指定的單元格是否是合併單元格
     *
     * @param sheet
     *            工作表
     * @param row
     *            行下標
     * @param column
     *            列下標
     * @return
     */
    public static boolean isMergedRegion(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if (row >= firstRow && row <= lastRow) {
                if (column >= firstColumn && column <= lastColumn) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 讀合併單元格值
     * @param sheet 表格
     * @param cell cell
     * @return value
     */
    public static String getMergedCellValue(Sheet sheet, Cell cell){
        int firstC;
        int lastC;
        int firstR;
        int lastR;
        String value = "";
        List<CellRangeAddress> listCombineCell = sheet.getMergedRegions();
        for (CellRangeAddress ca : listCombineCell) {
            // 獲得合併單元格的起始行, 結束行, 起始列, 結束列
            firstC = ca.getFirstColumn();
            lastC = ca.getLastColumn();
            firstR = ca.getFirstRow();
            lastR = ca.getLastRow();
            if (cell.getRowIndex() >= firstR && cell.getRowIndex() <= lastR) {
                if (cell.getColumnIndex() >= firstC && cell.getColumnIndex() <= lastC) {
                    // 獲取合併單元格左上角單元格值
                    Row fRow = sheet.getRow(firstR);
                    Cell fCell = fRow.getCell(firstC);
                    value = getCellVal(fCell);
                }
            }
        }
        return value;
    }
    
    public static void main(String[] arg){
//        String path = "C:\\Users\\Administrator\\Desktop\\1.xlsx";
//        try {
//            List<String> tenantIds = readExcel(path);
////            for (String s:tenantIds){
////                System.out.println(s);
////            }
//        } catch (Exception e) {
//
//        }
        String s="0.0";
        System.out.println("0.0".equals(s));


    }
}