Apache POI导出Excel

// keep 100 rows in memory, exceeding rows will be flushed to disk

 // SXSSFWorkbook.DEFAULT_WINDOW_SIZE == 100

//SXSSFWorkbook 不支持Excel 2003版本

SXSSFWorkbook workBook = new SXSSFWorkbook(SXSSFWorkbook.DEFAULT_WINDOW_SIZE);

Row row = null;

Cell cell = null;

Sheet sheet = wb.createSheet();

long start = System.currentTimeMillis();

for(int i = 0;i < 1000000;i++){

    //亲自测试excel中的一个sheet可以存放下100万条数据，若是数据量更大能够考虑使用多个sheet

    row = sheet.createRow(i);

    cell = row.createCell(0);

    cell.setCellValue("a" + i);

    //System.out.println(i);

}

FileOutputStream out = new FileOutputStream("E:\\a.xlsx");

wb.write(out);

out.close();

// dispose of temporary files backing this workbook on disk

wb.dispose();

//花费2秒左右时间,固然我每行只建立了一个单元格，建立多个单元格时间可能会增长

System.out.println("花费:" + (System.currentTimeMillis() - start) + "毫秒");