poi方式的EXcel文件導入導出03版xls,07版xlsx

首先導入需要的依賴

		//03xls
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.9</version>
       
		//07xlsx
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.9</version>
        </dependency>  

  /**
     * 優點：寫入快
     * 缺點：最多隻能寫65536行
     * @throws IOException
     */
    @Test
    public void testWrite03xls() throws IOException {

        //創建workbook
        Workbook wb = new HSSFWorkbook();

        //創建sheet
        Sheet sheet = wb.createSheet("new sheet");

        //創建row
        for (int rowNum = 0; rowNum < 65536; rowNum++) {
            Row row = sheet.createRow(rowNum);
            //創建cell
            for (int cellNum = 0; cellNum < 10; cellNum++) {
                Cell cell = row.createCell(cellNum);
        	  //傳入值
                cell.setCellValue("我是寫入的值");
            }
        }
        //將內存中的workbook寫入磁盤
        OutputStream out = new
        FileOutputStream("D:/poi/text01.xls");
        wb.write(out);
        
        //關閉文件
        out.close();
    }  

 /**
     * 優點：可以寫入更多的數據（大於65526行）
     * 缺點：寫入慢、會遇到OOM
     * @throws IOException
     */
    @Test
    public void testWrite07XSSF() throws IOException {
        //創建workbook
        Workbook wb = new XSSFWorkbook();

        //創建sheet
        Sheet sheet = wb.createSheet("sheet1");

        //創建row
        for (int rowNum = 0; rowNum < 65536; rowNum++) {
            Row row = sheet.createRow(rowNum);
            //創建cell
            for (int cellNum = 0; cellNum < 10; cellNum++) {
                Cell cell = row.createCell(cellNum);
                cell.setCellValue("我是寫入的值");
            }

        }
        //將內存中的workbook寫入磁盤
        OutputStream out = new FileOutputStream("D:/poi/text02.xlsx");
        wb.write(out);

        //關閉文件
        out.close();
    }

    /**
     * 優點：寫入速度快、可以寫大數據量
     * @throws IOException
     */
    @Test
    public void testWrite07SXSSF() throws IOException {
        //創建workbook
        Workbook wb = new SXSSFWorkbook();

        //創建sheet
        Sheet sheet = wb.createSheet("sheet1");

        //創建row
        for (int rowNum = 0; rowNum < 65536; rowNum++) {
            Row row = sheet.createRow(rowNum);
            //創建cell
            for (int cellNum = 0; cellNum < 10; cellNum++) {
                Cell cell = row.createCell(cellNum);
               cell.setCellValue("我是寫入的值");
            }

        }
        //將內存中的workbook寫入磁盤
        OutputStream out = new FileOutputStream("D:/poi/text03.xlsx");
        wb.write(out);
        //關閉文件
        out.close();
        //清除臨時文件
        ((SXSSFWorkbook)wb).dispose();
    }