excel导入导出

在实际项目开发中经常需要使用excel导入数据或导出数据到excel中，使用POI做开发有点麻烦，推荐大家一个特别好用的excel导入导出的组件，超级好用，gitee地址：https://gitee.com/wuwenze/ExcelKit

搭建步骤

首先导入依赖

<dependency>
    <groupId>com.wuwenze</groupId>
    <artifactId>ExcelKit</artifactId>
    <version>2.0.72</version>
    <exclusions>
        <exclusion>
            <artifactId>xml-apis</artifactId>
            <groupId>xml-apis</groupId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>xml-apis</groupId>
    <artifactId>xml-apis</artifactId>
    <version>1.4.01</version>
</dependency>

特别说明：如果只是导入Excelkit包的话，可能xml-apis包版本太低而报错，所以从新高版本的xml-apis可以解决

创建实体类，配置exle与实体之间的映射关系

@Data
@Excel(value = "用户信息")
@AllArgsConstructor
@NoArgsConstructor
public class User {

    @ExcelField(value = "编号", width = 30)
    private Long userId;

    @ExcelField(value = "用户名",required = true)
    private String username;

    @ExcelField(value = "密码", required = true, maxLength = 32)
    private String password;

    @ExcelField(value = "邮箱",required = true, maxLength = 32 )
    private String email;
}

一行代码构建excel导入模板，创建controller类

@RestController
@Slf4j
public class ExcelController {

  /**
   * 下载excel模板
   *
   * @param response
   */
  @RequestMapping(value = "/downTemplate", method = RequestMethod.GET)
  public void downTemplate(HttpServletResponse response) {
    List<User> userList = new ArrayList<>();

    ExcelKit.$Export(User.class, response).downXlsx(userList, true);
  }
}

通过excel导入模板数据

  @RequestMapping(value = "/importUser", method = RequestMethod.POST)
  public ResponseEntity<?> importUser(@RequestParam MultipartFile file) throws IOException {

    List<User> successList = Lists.newArrayList();
    List<Map<String, Object>> errorList = Lists.newArrayList();

    ExcelKit.$Import(User.class)
        .readXlsx(
            file.getInputStream(),
            new ExcelReadHandler<User>() {

              @Override
              public void onSuccess(int sheetIndex, int rowIndex, User entity) {
                successList.add(entity); // 单行读取成功，加入入库队列。
              }

              @Override
              public void one rror(int sheetIndex, int rowIndex, List<ExcelErrorField> errorFields) {
                // 读取数据失败，记录了当前行所有失败的数据

                Map<String, Object> errorMap = new HashMap<>();
                errorMap.put("sheetIndex", sheetIndex);
                errorMap.put("rowIndex", rowIndex);
                errorMap.put("errorFields", errorFields);

                errorList.add(errorMap);
              }
            });

    // TODO: 执行successList的入库操作。

    HashMap<String, Object> resultMap = new HashMap<>();
    resultMap.put("data", successList);
    resultMap.put("haveError", !CollectionUtil.isEmpty(errorList));
    resultMap.put("error", errorList);
    return ResponseEntity.ok(resultMap);
  }