POI 设置

　　

              FileOutputStream fos = new FileOutputStream("D:\15.xls");

HSSFWorkbook wb = new HSSFWorkbook();

/**
 * ========================================================
 *                          设置cell宽度
 *  通过sheet 对象，setColumnWidth设置cell的宽度
 * ========================================================
 */
HSSFSheet sheet = wb.createSheet("sheet1");
// api 段信息 Set the width (in units of 1/256th of a character width)
sheet.setColumnWidth(0, 20 * 256);

/**
 * ========================================================
 *                          设置行高度
 *  通过row 对象设置行高
 * ========================================================
 */
HSSFRow row = sheet.createRow(0);
//heightInPoints 设置的值永远是height属性值的20倍
row.setHeightInPoints(20);

HSSFRow row1 = sheet.createRow(5);
// Set the row's height or set to ff (-1) for undefined/default-height.
// Set the height in "twips" or
// 1/20th of a point.
row1.setHeight((short) (25 * 20));

HSSFCell cell = row.createCell(0);

cell.setCellValue("a1b2c3d4e5f6g7h8i9");

//设置默认宽度、高度值
HSSFSheet sheet2 =  wb.createSheet("sheet2");

sheet2.setDefaultColumnWidth(20);
sheet2.setDefaultRowHeightInPoints(20);

              //格式化单元格日期信息
HSSFDataFormat dataFormat =  wb.createDataFormat();
short dataformat = dataFormat.getFormat("yyyy-mm-dd HH:MM");
HSSFCellStyle style = wb.createCellStyle();


style.setDataFormat(dataformat);


HSSFCell cell2 = sheet2.createRow(0).createCell(0);

cell2.setCellValue(new Date());

cell2.setCellStyle(style);

wb.write(fos);

fos.close();