一，用框架生成增删改查模块 

二，在实体类entity 需要导入导出的字段上加上注解@Excel

三，在controller类上继承jeecgboot通用controller     

JeecgController

并且在JeecgController里增加导出模板的方法

/**
     * 导出excel空模板
     *
     * @param request
     */
    protected ModelAndView exportTemplateXls(HttpServletRequest request, T object, Class<T> clazz, String title) {
        // Step.1 组装查询条件
        LoginUser sysUser = (LoginUser) SecurityUtils.getSubject().getPrincipal();

        // Step.2 获取空模板
        List<T> exportList = new ArrayList<T>();

        // Step.3 AutoPoi 导出Excel
        ModelAndView mv = new ModelAndView(new JeecgEntityExcelView());
        //此处设置的filename无效 ,前端会重更新设置一下
        mv.addObject(NormalExcelConstants.FILE_NAME, title);
        mv.addObject(NormalExcelConstants.CLASS, clazz);
        //update-begin--Author:liusq  Date:20210126 for：图片导出报错，ImageBasePath未设置--------------------
        ExportParams exportParams=new ExportParams(title + "电价配置导入模板表", "导出人:" + sysUser.getRealname(), title);
        exportParams.setImageBasePath(jeecgBaseConfig.getPath().getUpload());
        //update-end--Author:liusq  Date:20210126 for：图片导出报错，ImageBasePath未设置----------------------
        mv.addObject(NormalExcelConstants.PARAMS,exportParams);
        mv.addObject(NormalExcelConstants.DATA_LIST, exportList);
        return mv;
    }

四，在Controller实现导入导出的接口  把POJO替换成加了@Excel的entity实体类

    /**
     * 导出excel
     *
     * @param request
     * @param 
     */

    @RequestMapping(value = "/exportXls")
    @ApiOperation("导出excel")
    public ModelAndView exportXls(HttpServletRequest request, POJO pojo) {
        return super.exportXls(request, POJO , POJO.class, "表的名字");
    }

    /**
     * 导出excel模板
     *
     * @param request
     * @param tbElectrovalence
     */
    @RequestMapping(value = "/exportTemplateXls")
    @ApiOperation("导出excel模板")
    public ModelAndView exportTemplateXls(HttpServletRequest request, POJO pojo) {
        return super.exportTemplateXls(request, POJO , POJO.class, "表的名字");
    }



    /**
     * 通过excel导入数据
     *
     * @param request
     * @param response
     * @return
     */

    @RequestMapping(value = "/importExcel", method = RequestMethod.POST)
    @ApiOperation("通过excel导入数据")
    public Result<?> importExcel(HttpServletRequest request, HttpServletResponse response) {
        return super.importExcel(request, response, POJO.class);
    }

五，测试导入导出成功