百万数据17秒生成EXCEL表格

 在pom.xml中增加jar包支持

         <!--excel数据表格导出 statrt -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>3.17</version>
        </dependency>
        <!-- 获取数据转换的时候用到 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-collections4</artifactId>
            <version>4.1</version>
        </dependency>
        <!--excel数据表格导出 end -->

 生成Excel表格数据工具类

public class ExcelBigUtil {

    public static void main(String[] args) {
        List<String[]> arrayList = new ArrayList<>();
        String[] arry1 = {"小明1", "小明2", "小明3", "小明4", "小明5", "小明6", "小明7", "小明8"};
        String[] arry2 = {"第二条数据1", "第二条数据2", "第二条数据3", "第二条数据4", "第二条数据5", "第二条数据6", "第二条数据7", "第二条数据8"};
        String[] arry3 = {"第三条数据1", "第三条数据2", "第三条数据3", "第三条数据4", "第三条数据5", "第三条数据6", "第三条数据7", "第三条数据8"};
        String[] arry4 = {"第四条数据1", "第四条数据2", "第四条数据3", "第四条数据4", "第四条数据5", "第四条数据6", "第四条数据7", "第四条数据8"};
        String[] arry5 = {"第五条数据1", "第五条数据2", "第五条数据3", "第五条数据4", "第五条数据5", "第五条数据6", "第五条数据7", "第五条数据8"};

        for (int i = 0; i < 200000; i++) { //100万数据17秒生成
            arrayList.add(arry1);
            arrayList.add(arry2);
            arrayList.add(arry3);
            arrayList.add(arry4);
            arrayList.add(arry5);
        }

        System.out.println("=======size:" + arrayList.size());
        String fieldArray[] = {"标题1", "标题2", "标题3", "标题4", "标题5", "标题6", "标题7", "标题8"};
        try {
            System.out.println("----start------" + DateUtil.getNowDate());//Mon Apr 27 16:32:10 CST 2020
            //在D盘建立Excel表格：excel2010.xlsx
            exportBigExcel(fieldArray, arrayList, "D:\\excel2010.xlsx");//Mon Apr 27 16:32:27 CST 2020
            System.out.println("----end------" + DateUtil.getNowDate());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 导出大量数据到EXCEL表格
     * 支持：（Excel 2007）
     * @param fieldArray 表格头标题字段
     * @param listArray  表格数据数组
     * @param filePath   excel文件的路径
     * @throws IOException
     */
    public static void exportBigExcel(String[] fieldArray, List<String[]> listArray, String filePath) throws IOException, InvalidFormatException {
        XSSFWorkbook workbook1 = new XSSFWorkbook(new FileInputStream(filePath));
        SXSSFWorkbook sxssfWorkbook = new SXSSFWorkbook(workbook1, 100);
        Sheet first = sxssfWorkbook.getSheetAt(0);
        //创建第一行的值
        Row row = first.createRow(0);
        for (int i = 0; i < fieldArray.length; i++) {
            row.createCell(i).setCellValue(fieldArray[i]);
        }
        //从数据库取数据填充到Excel
        for (int i = 1; i < listArray.size() + 1; i++) {//从第二行开始计算数据
            String[] rowArray = listArray.get(i - 1);
            Row rowTemp = first.createRow(i);
            for (int j = 0; j < fieldArray.length; j++) {
                rowTemp.createCell(j).setCellValue(rowArray[j]);
            }
        }
        FileOutputStream out = new FileOutputStream(filePath);
        sxssfWorkbook.write(out);
        out.close();
    }
}

 

来源：oschina

链接：https://my.oschina.net/u/3204029/blog/4257219