POI 작업 excel 파일

public void exportExcel(String title, String[] headers,
			List<Object[]> dataset, OutputStream out, short[] width) {
		//  
		HSSFWorkbook workbook = new HSSFWorkbook();
		//  
		HSSFSheet sheet = workbook.createSheet(title);
		//  15 
		sheet.setDefaultColumnWidth((short) 15);
		//  
		HSSFCellStyle style = workbook.createCellStyle();
		//  
		style.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		//  
		HSSFFont font = workbook.createFont();
		font.setColor(HSSFColor.VIOLET.index);
		font.setFontHeightInPoints((short) 12);
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		//  
		style.setFont(font);
		//  
		HSSFCellStyle style2 = workbook.createCellStyle();
		style2.setFillForegroundColor(HSSFColor.WHITE.index);
		style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
		//  
		HSSFFont font2 = workbook.createFont();
		font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		//  
		style2.setFont(font2);

		//  
		HSSFRow row = sheet.createRow(0);
		for (short i = 0; i < headers.length; i++) {
			HSSFCell cell = row.createCell(i);
			cell.setCellStyle(style);
			HSSFRichTextString text = new HSSFRichTextString(headers[i]);
			cell.setCellValue(text);
		}

		for(int j=0;j<dataset.size();j++){
			row = sheet.createRow(j+1);
			
			for (short i = 0; i < dataset.get(j).length; i++) {
				HSSFCell cell = row.createCell(i);				
				cell.setCellStyle(style2);
				HSSFRichTextString richString = new HSSFRichTextString(
				String.valueOf( dataset.get(j)[i]).replace("null", ""));
//							HSSFFont font3 = workbook.createFont();
//							font3.setColor(HSSFColor.BLACK.index);
//							richString.applyFont(font3);
				cell.setCellValue(richString);
			}
		}
		
		if(width!=null){
			for(short i=0;i<width.length;i++){
				sheet.setColumnWidth(i,width[i]);
			}
		}
		try {
			workbook.write(out);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}