Java POI组件实现导入

1. 导入依赖

    
    
      org.apache.poi
      poi
      3.17
    

2. 实体类

package com.ssm.bean;
 
 
import org.springframework.format.annotation.DateTimeFormat;
 
import java.util.Date;
 
public class Users {
 
    private Long uid;
    private String uno;
    private String uname;
    private String password;
    private String sex;
    private Integer age;
    @DateTimeFormat(pattern="yyyy-MM-dd")
    private Date birthday;
    private String phone;
    private String address;
    private Long type;
    private String uhead;
 
    public Users() {
    }
 
   //实现Constructor、getter、setter、toString()
}

3. 业务层使用POI组件导入

//导入用户
    @RequestMapping("/improt")
    public String ImportUSer(@RequestParam("importFile") MultipartFile importFile, HttpServletRequest request){
        System.out.println("导入操作！");
        //使用MD5加密
        System.out.println("文件是否为空：" + importFile.isEmpty());
        System.out.println("文件原名：" + importFile.getOriginalFilename());
        //使用UUID，以免文件名重复
        UUID uuid = UUID.randomUUID();
        //新的文件名
        String newFileName = uuid.toString() + ".xlsx";
        System.out.println("新的文件名：" + newFileName);
        //获取application对象
        ServletContext application = request.getServletContext();
        //获取服务器真实路径
        String realPath = application.getRealPath("/files/imp");
        System.out.println("服务器真实路径：" + realPath);
        File newFolder = creatNewFolder(realPath);
        //内存中的文件
        File file = new File(newFolder, newFileName);
        //获取文件的绝对路径
        String absolutePath = file.getAbsolutePath();
        System.out.println("绝对路径：" + absolutePath);
        try {
            //上传到绝对路径，写到硬盘
            importFile.transferTo(new File(absolutePath));
        } catch (IOException e) {
            System.out.println("IOException");
        }

        System.out.println("开始导入数据-----------------");
        try {
            //读文件到内存
            FileInputStream fis = new FileInputStream(new File(absolutePath));
            //获取工作簿对象
            HSSFWorkbook workbook = new HSSFWorkbook(fis);
            //获取第一个sheet
            HSSFSheet sheet = workbook.getSheetAt(0);
            //遍历每一行（除去第一行）
            List users = new ArrayList<>();
            for(int i = 1; i <= sheet.getLastRowNum(); i++){
                HSSFRow row = sheet.getRow(i);
                if(row==null){
                    continue;
                }
                Users u = new Users();
                //遍历每一行的每个单元格
                for(int j = 0; j < row.getLastCellNum(); j++){
                    //每个单元格
                    HSSFCell cell = row.getCell(j);
                    //单元格的类型
                    CellType cellTypeEnum = cell.getCellTypeEnum();
                    Object cellValue = null;
                    System.out.println("类型：" + j + ":" + cellTypeEnum);
                    //String类型
                    if(CellType.STRING.equals(cellTypeEnum)){
                        cellValue = cell.getStringCellValue();
                    }
                    //数字类型
                    if(CellType.NUMERIC.equals(cellTypeEnum)){
                        cellValue = cell.getNumericCellValue();
                    }
                    if(cellValue == null){
                        cellValue = "";
                    }
                    //将单元格中的值装到对象中
                    switch (j){
                        case 0:
                            u.setUno((String)cellValue);
                            System.out.println("++++++++0:" + cellValue);
                            break;
                        case 1:
                            u.setUname((String)cellValue);
                            System.out.println("++++++++1:" + cellValue);
                            break;
                        case 2:
                            String password = MD5Util.MD5Encode((String) cellValue, "UTF-8");
                            u.setPassword(password);
                            System.out.println("++++++++2:" + cellValue);
                            break;
                        case 3:
                            u.setSex((String)cellValue);
                            System.out.println("++++++++3:" + cellValue);
                            break;
                        case 4:
                            u.setAge( Integer.parseInt(new java.text.DecimalFormat("0").format(cellValue)));
                            System.out.println("++++++++4:" + cellValue);
                            break;
                        case 5:
                            u.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse((String)cellValue));
                            System.out.println("++++++++5:" + cellValue);
                            break;
                        case 6:
                            //数据过大，转成String会变成科学记数法
                            String phone = new BigDecimal((Double) cellValue).toString();
                            u.setPhone(phone);
                            System.out.println("++++++++6:" + phone);
                            break;
                        case 7:
                            u.setAddress((String)cellValue);
                            System.out.println("++++++++7:" + cellValue);
                            break;
                        case 8:
                            switch ((String)cellValue){
                                case "管理员":
                                    u.setType(1L);
                                case "经理":
                                    u.setType(2L);
                                case "普通用户":
                                    u.setType(3L);
                            }
                            System.out.println("++++++++8:" + cellValue);
                            break;
                        case 9:
                            u.setUhead((String)cellValue);
                            System.out.println("++++++++9:" + cellValue);
                            break;
                        default:
                            break;
                    }
                }
                users.add(u);
            }
            System.out.println("导入完毕-----------------");
            for (Users user : users) {
                System.out.println(user);
                //增加到数据库
                userService.addUser(user);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("IOException");
        } catch (ParseException e) {
            System.out.println("ParseException");
        }
        System.out.println("导入操作完成！");
        //转到首页
        return "redirect:list";
    }

4. 测试数据截图

5. 测试数据见附件

https://download.csdn.net/download/dmxexcalibur/11197487