将数据库信息导入excel表格，以及excel导入数据库

数据导入excel表

导入excel表，需要添加jar包    jxl.jar      
百度网盘下载链接：https://pan.baidu.com/s/1vZVr-GzPWlIKgrr-SOnhSA 
提取码：2u0k

public static void data2Excel(List<Og> list) {
        try {
            // 创建可写入的Excel工作簿
            String fileName = "C:\\Users\\Administrator\\Desktop\\111.xlsx";
            File file = new File(fileName);
            if (!file.exists()) {
                file.createNewFile();
            }
            //以fileName为文件名来创建一个Workbook
            WritableWorkbook wwb = jxl.Workbook.createWorkbook(file);
            // 创建工作表
            WritableSheet ws = wwb.createSheet("Test Shee 1", 0);
            //要插入到的Excel表格的行号，默认从0开始
            Label labelId = new Label(0, 0, "编号(id)");
            Label labelOg = new Label(1, 0, "名称(og)");
            Label labelCount = new Label(2, 0, "数量(count)");
            ws.addCell(labelId);
            ws.addCell(labelOg);
            ws.addCell(labelCount);
            for (int i = 0; i < list.size(); i++) {
                Label id = new Label(0, i + 1, list.get(i).getId() + "");
                Label og = new Label(1, i + 1, list.get(i).getOg());
                Label count = new Label(2, i + 1, list.get(i).getCount() + "");
                ws.addCell(id);
                ws.addCell(og);
                ws.addCell(count);
            }
            //写进文档
            wwb.write();
            // 关闭Excel工作簿对象
            wwb.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

excel导入数据库

public static List<Og> excel2Data(String excelPath) throws Exception {
        try {
            excelPath = "C:\\Users\\Administrator\\Desktop\\111.xlsx";
            //String encoding = "GBK";
            File excel = new File(excelPath);
            String[] split = excel.getName().split("\\.");  //.是特殊字符，需要转义！！！！！
            Workbook wb = null;
            InputStream fis = new FileInputStream(excel);   //文件流对象
            //根据文件后缀（xls/xlsx）进行判断
            if ("xls".equals(split[1])) {
                wb = new HSSFWorkbook(fis);
            } else if ("xlsx".equals(split[1])) {
                wb = new XSSFWorkbook(fis);
            } else {
                throw new Exception("上传文件不是excel文件!");
            }
            //开始解析
            Sheet sheet = wb.getSheetAt(0);     //读取sheet 0
            int firstRowIndex = sheet.getFirstRowNum() + 1;   //第一行是列名，所以不读
            int lastRowIndex = sheet.getLastRowNum();
            List<Og> ogList = new ArrayList<>();
            String id = null;
            String ogString = null;
            String count = null;
            //属性字段行
            Row title = sheet.getRow(firstRowIndex - 1);
            for (int rIndex = firstRowIndex; rIndex <= lastRowIndex; rIndex++) {   //遍历行
                Row row = sheet.getRow(rIndex);
                if (row != null) {
                    Og og = new Og();
                    int firstCellIndex = title.getFirstCellNum();
                    int lastCellIndex = title.getLastCellNum();
                    for (int cIndex = firstCellIndex; cIndex < lastCellIndex; cIndex++) {   //遍历列
                        Cell cell = row.getCell(cIndex);
                        //获取空值的单元格
                        if (cell == null || "".equals(cell.toString().trim())) {
                            Integer rr = (rIndex + 1);
                            Integer cc = (cIndex + 1);
                            String ss = (char) (cc + 64) + "";
                            String asd = ss + rr;
                            throw new Exception("excel文件导入数据库失败:" + asd + " 单元格空值!");
                        } else {
                            switch (cIndex) {
                                case 0:
                                    id = cell.toString();
                                    break;
                                case 1:
                                    ogString = cell.toString();
                                    break;
                                case 2:
                                    count = cell.toString();
                                    break;
                                default:
                                    break;
                            }
                        }
                    }
                    int i1 = id.lastIndexOf(".");
                    String substring1 = id.substring(0, i1);
                    Integer aa1 = Integer.valueOf(substring1);
                    og.setId(aa1);
                    int i = count.lastIndexOf(".");
                    String substring = count.substring(0, i);
                    Integer aa = Integer.valueOf(substring);
                    og.setCount(aa);
                    og.setOg(ogString);
                    ogList.add(og);
                }
            }
            return ogList;
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception("excel文件导入数据库失败");
        }
    }

//从excel表获取的集合ogList，批量插入数据库
//从excel表获取的集合ogList，批量插入数据库