Excel 도구 클래스 POIExcelUtil

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class POIExcelUtil {
	public static void readXls() throws IOException {
		InputStream is = new FileInputStream("D:\\excel\\xls_test2.xls");
		HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);

		//  Sheet
		for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
			HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
			if (hssfSheet == null) {
				continue;
			}

			//  Row
			for (int rowNum = 0; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
				HSSFRow hssfRow = hssfSheet.getRow(rowNum);
				if (hssfRow == null) {
					continue;
				}

				//  Cell
				for (int cellNum = 0; cellNum <= hssfRow.getLastCellNum(); cellNum++) {
					HSSFCell hssfCell = hssfRow.getCell(cellNum);
					if (hssfCell == null) {
						continue;
					}

					System.out.print("    " + getValue(hssfCell));
				}
				System.out.println();
			}
		}
	}

	public static String getValue(HSSFCell hssfCell) {
		if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) {
			return String.valueOf(hssfCell.getBooleanCellValue());
		} else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) {
			return String.valueOf(hssfCell.getNumericCellValue());
		} else {
			return String.valueOf(hssfCell.getStringCellValue());
		}
	}
	
	//xlsx
	public static void readXlsx() throws IOException{  
	    String fileName = "D:\\excel\\xlsx_test.xlsx";  
	    XSSFWorkbook xssfWorkbook = new XSSFWorkbook( fileName);  
	      
	    //  Sheet  
	    for(int numSheet = 0; numSheet < xssfWorkbook.getNumberOfSheets(); numSheet++){  
	      XSSFSheet xssfSheet = xssfWorkbook.getSheetAt( numSheet);  
	      if(xssfSheet == null){  
	        continue;  
	      }  
	        
	      //  Row   
	      for(int rowNum = 0; rowNum <= xssfSheet.getLastRowNum(); rowNum++ ){  
	        XSSFRow xssfRow = xssfSheet.getRow( rowNum);  
	        if(xssfRow == null){  
	          continue;  
	        }  
	          
	        //  Cell     
	        for(int cellNum = 0; cellNum <= xssfRow.getLastCellNum(); cellNum++){  
	          XSSFCell xssfCell = xssfRow.getCell( cellNum);  
	          if(xssfCell == null){  
	            continue;  
	          }  
	          System.out.print("   "+getsValue(xssfCell));  
	        }  
	        System.out.println();  
	      }  
	    }  
	  }  
	public static String getsValue(XSSFCell xssfCell){  
	    if(xssfCell.getCellType() == xssfCell.CELL_TYPE_BOOLEAN){  
	      return String.valueOf( xssfCell.getBooleanCellValue());  
	    }else if(xssfCell.getCellType() == xssfCell.CELL_TYPE_NUMERIC){  
	      return String.valueOf( xssfCell.getNumericCellValue());  
	    }else{  
	      return String.valueOf( xssfCell.getStringCellValue());  
	    }  
	  }  
	
}