EasyExcel 读写 excel easyexcel

官网： https://github.com/alibaba/easyexcel

参考：https://blog.csdn.net/jiangjiandecsd/article/details/81115622

https://blog.csdn.net/jianggujin/article/details/80200400

推荐:

https://www.jianshu.com/p/3a64ade57bf2

EasyExcel教程:

https://blog.csdn.net/sinat_32366329/article/details/103109058?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase

EasyExcel 读取excel: (noModel)

    /* 解析监听器，
     * 每解析一行会回调invoke()方法。
     * 整个excel解析结束会执行doAfterAllAnalysed()方法
     * 下面只是我写的一个样例而已，可以根据自己的逻辑修改该类。
     */
    public class ExcelListener extends AnalysisEventListener {

        //自定义用于暂时存储data。
        //可以通过实例获取该值
        private List<Object> datas = new ArrayList<Object>();
        public void invoke(Object object, AnalysisContext context)
        {
            System.err.println(JSONValue.toJSONString(context));
            System.out.println("当前行："+context.getCurrentRowNum());
            System.out.println(object);
            datas.add(object);//数据存储到list，供批量处理，或后续自己业务逻辑处理。
            doSomething(object);//根据自己业务做处理
        }
        private void doSomething(Object object) {
            //1、入库调用接口
        }
        public void doAfterAllAnalysed(AnalysisContext context) {
            // datas.clear();//解析结束销毁不用的资源
        }
        public List<Object> getDatas() {
            return datas;
        }
        public void setDatas(List<Object> datas) {
            this.datas = datas;
        }
    }


    /**
     * test read excel with easyexcel
     * @throws FileNotFoundException
     */
    @Test
    public void testReadExcelNoModel() throws FileNotFoundException {
//        InputStream inputStream = getInputStream("loan1.xls");
        FileInputStream inputStream = new FileInputStream("C:\Users\lenove\Desktop\seatest.xlsx");
        ExcelReader excelReader =null;
        try {
            // 解析每行结果在listener中处理
            ExcelListener listener = new ExcelListener();
/**   #######      方式一  return  List<List>     ######
//           # EasyExcelFactory.readBySax(inputStream, new Sheet(1,0),listener);
//            ExcelReader excelReader = new ExcelReader(inputStream, ExcelTypeEnum.XLSX,null, listener);
//            excelReader.read(new Sheet(1,0));
//            List<Object> datas = listener.getDatas();
//            System.err.println(datas);
 **/

//########    方式2        return   List<Map>#######
            excelReader = EasyExcel.read(inputStream,listener).headRowNumber(0).build();
            ReadSheet readSheet = EasyExcel.readSheet(0).build();
            excelReader.read(readSheet);
            System.err.println(JSONValue.toJSONString(listener.getDatas()));
        } catch (Exception e)
        {
            System.err.println("exception is "+e);
        } finally
        {
            try
            {
                   if (excelReader != null) {
                    // 这里千万别忘记关闭，读的时候会创建临时文件，到时磁盘会崩的
                    excelReader.finish();}
                    inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }