POI3.5_HSSF_和XSSF_Excel操作快速入门

最基本的操作：

public static void main(String[] args) throws Exception {
		//创建excel
		Workbook wb = new HSSFWorkbook();
		//创建sheet
		Sheet sheet = wb.createSheet("iloveyou");
		//创建行
		Row row = sheet.createRow(0);
		//创建单元格
		Cell cell =  row.createCell(0);
		//填充元素
		cell.setCellValue("I Love You!");
		//输出流
		FileOutputStream out = new FileOutputStream("iloveyou.xls");
		//写出
		wb.write(out);
		//关闭流
		out.close();
	}

public class PoiTest1 {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		//创建excel文件
		Workbook wb = new HSSFWorkbook();
		
		CreationHelper createHelper = wb.getCreationHelper();
		
		Sheet sheet = wb.createSheet("dateSheet");
		
		Row row = sheet.createRow(0);
		
		Cell cell = row.createCell(0);
		
		cell.setCellValue(new Date());
		
		CellStyle cellStyle = wb.createCellStyle();
		cellStyle.setDataFormat(createHelper.createDataFormat().getFormat("m/d/yy h:mm"));
		
		cell = row.createCell(1);
		
		cell.setCellValue(new Date());
		
		cell.setCellStyle(cellStyle);
		
		//使用java.util.Calendar来设置单元格格式
		cell = row.createCell(2);
		cell.setCellValue(Calendar.getInstance());
		cell.setCellStyle(cellStyle);
		
		FileOutputStream fileOut = new FileOutputStream("workbook.xls");
		wb.write(fileOut);
		fileOut.close();	
	}

}

public class PoiTest7 {
	public static void main(String[] args) throws Exception {
		Workbook wb = new XSSFWorkbook();
		Sheet sheet = wb.createSheet("new sheet");
		
		Row row = sheet.createRow((short)1);
		
		CellStyle style = wb.createCellStyle();
		
		style.setFillBackgroundColor(IndexedColors.YELLOW.getIndex());
		style.setFillPattern(CellStyle.BIG_SPOTS);
		
		Cell cell = row.createCell((short)1);
		cell.setCellValue("X");
		cell.setCellStyle(style);
		
		style = wb.createCellStyle();
		
		style.setFillBackgroundColor(IndexedColors.ORANGE.getIndex());
		style.setFillPattern(CellStyle.SOLID_FOREGROUND);
		cell = row.createCell((short)2);
		cell.setCellValue("X");
		cell.setCellStyle(style);
		
		FileOutputStream fileOut = new FileOutputStream("style2.xlsx");
		wb.write(fileOut);
		fileOut.close();
		
	}
}

通过4天学习，基本了解了POI的读取和写出操作，具体功能可以在实际应用时使用更多的格式。