Apache POI和EasyExcel 第三集：Apache POI的Excel大数据量写入（分为03版的xls、07版的xlsx、升级版SXSSF）

我的03跑了1.204秒，07跑了5.173秒，升级版跑了1.96秒，大家的会是多少呢？

    @Test
    public void testWrite03BigData() throws IOException {
        //记录开始时间
        long begin = System.currentTimeMillis();

        //创建一个SXSSFWorkbook
        Workbook workbook = new HSSFWorkbook();

        //创建一个sheet
        Sheet sheet = workbook.createSheet();

        //xls文件最大支持65536行
        for (int rowNum = 0; rowNum < 65536; rowNum++) {
            //创建一个行
            Row row = sheet.createRow(rowNum);
            for (int cellNum = 0; cellNum < 10; cellNum++) {
                //创建单元格
                Cell cell = row.createCell(cellNum);
                cell.setCellValue(cellNum);
            }
        }
        System.out.println("done");
        FileOutputStream out = new FileOutputStream(path + "bigdata03.xls");
        workbook.write(out);

        // 操作结束，关闭文件
        out.close();

        //记录结束时间
        long end = System.currentTimeMillis();
        System.out.println((double) (end - begin) / 1000);
    }

    @Test
    public void testWrite07BigData() throws IOException {
        //记录开始时间
        long begin = System.currentTimeMillis();

        //创建一个SXSSFWorkbook
        Workbook workbook = new XSSFWorkbook();

        //创建一个sheet
        Sheet sheet = workbook.createSheet();

        //xls文件最大支持65536行
        for (int rowNum = 0; rowNum < 65536; rowNum++) {
            //创建一个行
            Row row = sheet.createRow(rowNum);
            for (int cellNum = 0; cellNum < 10; cellNum++) {
                //创建单元格
                Cell cell = row.createCell(cellNum);
                cell.setCellValue(cellNum);
            }
        }
        System.out.println("done");
        FileOutputStream out = new FileOutputStream(path + "bigdata07.xlsx");
        workbook.write(out);

        // 操作结束，关闭文件
        out.close();

        //记录结束时间
        long end = System.currentTimeMillis();
        System.out.println((double) (end - begin) / 1000);
    }

    @Test
    public void testWrite07BigDataFast() throws IOException {
        //记录开始时间
        long begin = System.currentTimeMillis();

        //创建一个SXSSFWorkbook
        SXSSFWorkbook workbook = new SXSSFWorkbook();

        //创建一个sheet
        Sheet sheet = workbook.createSheet();

        //xls文件最大支持65536行
        for (int rowNum = 0; rowNum < 100000; rowNum++) {
            //创建一个行
            Row row = sheet.createRow(rowNum);
            for (int cellNum = 0; cellNum < 10; cellNum++) {

                //创建单元格
                Cell cell = row.createCell(cellNum);
                cell.setCellValue(cellNum);
            }
        }

        System.out.println("done");
        FileOutputStream out = new FileOutputStream(path + "bigdata07-fast.xlsx");
        workbook.write(out);

        // 操作结束，关闭文件
        out.close();

        //清除临时文件
        workbook.dispose();

        //记录结束时间
        long end = System.currentTimeMillis();
        System.out.println((double) (end - begin) / 1000);
    }