JavaExcel utility classes (compatible with XLS and XLSX)

“This is the 13th day of my participation in the First Challenge 2022. For details: First Challenge 2022

Recently used the import excel spreadsheet processing saved to the background database function! Org.apache. poi is used for processing

Sample code:

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;


/** * Created by LiYangYong on 2022/02/06 */
public class ExcelUtil {
    private final static String excel2003L =".xls";    //2003- Version of Excel
    private final static String excel2007U =".xlsx";   //2007+ version of Excel

    /** * Description: Get data from the IO stream and assemble it into List<List<Object>> Object *@param in,fileName
     * @return
     * @throws IOException
     */
    public static  List<List<Object>> getBankListByExcel(InputStream in, String fileName) throws Exception{
        List<List<Object>> list = null;

        // Create an Excel workbook
        Workbook work = getWorkbook(in,fileName);
        if(null == work){
            throw new Exception("Create Excel workbook empty!");
        }
        Sheet sheet = null;
        Row row = null;
        Cell cell = null;

        list = new ArrayList<List<Object>>();
        // Iterate over all the sheets in Excel
        for (int i = 0; i < work.getNumberOfSheets(); i++) {
            sheet = work.getSheetAt(i);
            if(sheet==null) {continue; }// Iterate over all lines in the current sheet
            for (int j = sheet.getFirstRowNum()+1; j < sheet.getLastRowNum()+1; j++) {
                row = sheet.getRow(j);
                if(row==null) {continue; }//  if(row==null||row.getFirstCellNum()==j){continue;}
                // Iterate over all columns
                List<Object> li = new ArrayList<Object>();
                for (inty = row.getFirstCellNum(); y < row.getLastCellNum(); y++) { cell = row.getCell(y); li.add(getCellValue(cell)); } list.add(li); }}return list;
    }

    /** * Description: ADAPTS to the uploaded file version * based on the file suffix@param inStr,fileName
     * @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("Parsed file format error ！！！！");
        }
        return wb;
    }

    /** * description: Format the values in the table *@param cell
     */
    public static Object getCellValue2(Cell cell){
        Object value = null;
        DecimalFormat df = new DecimalFormat("0");  // Format the number String character
        SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");  // Format the date
        DecimalFormat df2 = new DecimalFormat("0.00");  // Format the number

        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;
    }

    @SuppressWarnings("deprecation")
    public static String getCellValue(Cell cell) {
        if (cell == null)
            return "";
        if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
            return cell.getStringCellValue();
        } else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
            return String.valueOf(cell.getBooleanCellValue());
        } else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
            return cell.getCellFormula();
        } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
            short format = cell.getCellStyle().getDataFormat();
            System.out.println("format:"+format+";;;;; value:"+cell.getNumericCellValue());
            SimpleDateFormat sdf = null;
            if (format == 14 || format == 31 || format == 57 || format == 58| | -176<=format && format<=178) | | (182<=format && format<=196) | | (210<=format && format<=213) | | (208==format ) ) { / / date
                sdf = new SimpleDateFormat("yyyy-MM-dd");
            } else if (format == 20 || format == 32 || format==183| | -200<=format && format<=209)) {/ / time
                sdf = new SimpleDateFormat("HH:mm");
            } else { // It is not a date format
                return String.valueOf(cell.getNumericCellValue());
            }
            double value = cell.getNumericCellValue();
            Date date = DateUtil.getJavaDate(value);
            if(date==null || "".equals(date)){
                return "";
            }
            String result="";
            try {
                result = sdf.format(date);
            } catch (Exception e) {
                e.printStackTrace();
                return "";
            }
            return result;
        }
        return ""; }}Copy the code

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