Java讀取excel工具類

import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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.*;
import java.text.SimpleDateFormat;
import java.util.Date;

public class ExcelUtil {
    private static final String EXCEL_XLS = "xls";
    private static final String EXCEL_XLSX = "xlsx";

    public static void main(String[] args) {
        // 讀取Excel文件
        File file = new File("F:/data.xlsx");
        try {
            // 創建輸入流，讀取Excel
            InputStream is = new FileInputStream(file.getAbsolutePath());
            Workbook wb = null;
            if(file.getName().endsWith(EXCEL_XLS)){     //Excel 2003
                wb = new HSSFWorkbook(is);
            }else if(file.getName().endsWith(EXCEL_XLSX)){    // Excel 2007/2010
                wb = new XSSFWorkbook(is);
            }
            // 獲取Sheet對象
            Sheet sheet = wb.getSheetAt(0);

            //寫入txt
            File writeName = new File("F:/20190130_001.txt"); // 相對路徑，如果沒有則要建立一個新的txt文件
            writeName.createNewFile(); // 創建新文件,有同名的文件的話直接覆蓋
            FileWriter writer = new FileWriter(writeName);
            BufferedWriter out = new BufferedWriter(writer);

            //行數
            int rowNumber = sheet.getLastRowNum();
            System.out.println(rowNumber);
            for (int i = 1; i < rowNumber; i++) {
                String msg="";
                Row row = sheet.getRow(i);
                // 列數
                for (int j = 0; j < row.getLastCellNum(); j++) {
                    Cell cell = row.getCell(j);
                    if(cell!=null){
//                        Object val=getValue(cell);//xls
                        Object val=getCellValue(cell);//xlsx
                        msg += val + "|";
                    }
                }
                if(i<1122){
                    msg += "fujiewx\r\n";
                }else{
                    msg += "linnanwx\r\n";
                }
                System.out.println(i);
                out.write(msg);
            }

            out.flush(); // 把緩存區內容壓入文件
            out.close();

            System.out.println("執行完畢！");
        }catch (Exception e){

        }
    }

    private static Object getValue(Cell cell) {
        Object obj = null;
        switch (cell.getCellTypeEnum()) {
            case BOOLEAN:
                obj = cell.getBooleanCellValue();
                break;
            case ERROR:
                obj = cell.getErrorCellValue();
                break;
            case NUMERIC:
                obj = cell.getNumericCellValue();
                break;
            case STRING:
                obj = cell.getStringCellValue();
                break;
            default:
                break;
        }
        return obj;
    }


    public static String getCellValue(Cell cell) {
        String cellValue = "";
        if (cell == null) {
            return cellValue;
        }
        // 判斷數據的類型
        switch (cell.getCellType()) {
            case Cell.CELL_TYPE_NUMERIC: // 數字
                //short s = cell.getCellStyle().getDataFormat();
                if (HSSFDateUtil.isCellDateFormatted(cell)) {// 處理日期格式、時間格式
                    SimpleDateFormat sdf = null;
                    // 驗證short值
                    if (cell.getCellStyle().getDataFormat() == 14) {
                        sdf = new SimpleDateFormat("yyyy/MM/dd");
                    } else if (cell.getCellStyle().getDataFormat() == 21) {
                        sdf = new SimpleDateFormat("HH:mm:ss");
                    } else if (cell.getCellStyle().getDataFormat() == 22) {
                        sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
                    } else {
                        throw new RuntimeException("日期格式錯誤!!!");
                    }
                    Date date = cell.getDateCellValue();
                    cellValue = sdf.format(date);
                } else if (cell.getCellStyle().getDataFormat() == 0) {//處理數值格式
                    cell.setCellType(Cell.CELL_TYPE_STRING);
                    cellValue = String.valueOf(cell.getRichStringCellValue().getString());
                }
                break;
            case Cell.CELL_TYPE_STRING: // 字符串
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BOOLEAN: // Boolean
                cellValue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA: // 公式
                cellValue = String.valueOf(cell.getCellFormula());
                break;
            case Cell.CELL_TYPE_BLANK: // 空值
                cellValue = null;
                break;
            case Cell.CELL_TYPE_ERROR: // 故障
                cellValue = "非法字符";
                break;
            default:
                cellValue = "未知類型";
                break;
        }
        return cellValue;
    }

}