package poi;import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;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.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;public class FoundUnreadRecord {public static void main(String[] args) throws IOException {int rowNum = 1;createExcel_Reference(rowNum);createExcel_WithTips(rowNum);rowNum = 0;createExcel_Reference(rowNum);createExcel_WithTips(rowNum);}private static void createExcel_Reference(int rowNum) throws FileNotFoundException,IOException {String fileName = "UnreadRecordTips_Reference"+rowNum+".xlsx";XSSFWorkbook wb = new XSSFWorkbook();        Sheet sheet = wb.createSheet("UnreadRecordTips");for (int i = 0; i <= rowNum; i++) {Row row = sheet.createRow(i);Cell cell = row.createCell(0);cell.setCellValue("test" + i);}write(fileName, wb);}private static void createExcel_WithTips(int rowNum) throws FileNotFoundException,IOException {String fileName = "UnreadRecordTips"+rowNum+".xlsx";;XSSFWorkbook wb = new XSSFWorkbook();Sheet sheet = wb.createSheet("UnreadRecordTips");for (int i = 0; i <= rowNum; i++) {Row row = sheet.createRow(i);Cell cell = row.createCell(0);cell.setCellValue("test" + i);sheet.addMergedRegion(new CellRangeAddress(0, rowNum, 0, 0));}write(fileName, wb);}private static void write(String fileName, XSSFWorkbook wb)throws FileNotFoundException, IOException {OutputStream stream = new FileOutputStream(fileName);wb.write(stream);stream.close();}
}

package poi;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;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.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;public class MergedRegionReadHiddenValue {private static final String sheetName="mergedRegion";public static void main(String[] args) throws IOException {Workbook wb;wb=new HSSFWorkbook();String fileName="mergedRegion.xls";createExcelWithMergedRegion(wb,fileName);InputStream s=new FileInputStream(fileName);wb=new HSSFWorkbook(s);travelSheet(wb, sheetName);s.close();System.out.println("xls End.=========================xlsx Begin");wb=new XSSFWorkbook();fileName="mergedRegion.xlsx";createExcelWithMergedRegion(wb,fileName);s=new FileInputStream(fileName);wb=new XSSFWorkbook(s);travelSheet(wb, sheetName);s.close();}private static void createExcelWithMergedRegion(Workbook wb,String fileName)throws FileNotFoundException, IOException {Sheet sheet=wb.createSheet(sheetName);int lastRowNum=2;for (int i=0;i<=lastRowNum;i++) {createRowFillValue(sheet,i);}sheet.addMergedRegion(new CellRangeAddress(0, lastRowNum, 0, 0));write(wb, fileName);}private static void travelSheet(Workbook wb, String sheetName) {Sheet sheet;sheet=wb.getSheet(sheetName);for (Row row : sheet) {System.out.println(row.getCell(0).getStringCellValue());}}private static void write(Workbook wb, String fileName)throws FileNotFoundException, IOException {OutputStream stream=new FileOutputStream(fileName);wb.write(stream);stream.close();}private static void createRowFillValue(Sheet sheet,int rowIdx) {Row row=sheet.createRow(rowIdx);Cell cell=row.createCell(0);cell.setCellValue("CellValue,"+rowIdx+",0");;}}

CellValue,0,0
CellValue,1,0
CellValue,2,0
xls End.=========================xlsx Begin
CellValue,0,0
CellValue,1,0
CellValue,2,0