1. 优化ResultBean，统一响应结构

public enum BaseEnum {

  /**
   * 枚举类 不要在代码中出现魔法值
   */

  SUCCESS("请求成功!", 200),
  FAIL("请求失败!", 400);

  private String msg;
  private int code;

  BaseEnum(String msg, int code) {

    this.msg = msg;
    this.code = code;
  }

  public String getMsg() {
    return msg;
  }

  public int getCode() {
    return code;
  }

}


@Data
public class ResultBean<T> implements Serializable {

  private int code;
  private String msg;
  private Boolean resultFlag;

  private T data;

  public static <T> ResultBean successResult(T value) {

    ResultBean resultBean = new ResultBean();
    resultBean.setCode(BaseEnum.SUCCESS.getCode());
    resultBean.setMsg(BaseEnum.SUCCESS.getMsg());
    resultBean.setResultFlag(true);
    resultBean.setData(value);

    return resultBean;
  }

  public static ResultBean errorResult() {

    ResultBean resultBean = new ResultBean();
    resultBean.setCode(BaseEnum.FAIL.getCode());
    resultBean.setMsg(BaseEnum.FAIL.getMsg());
    resultBean.setResultFlag(false);
    return resultBean;
  }

  public static ResultBean errorJson(String msg) {

    ResultBean resultBean = new ResultBean();
    resultBean.setCode(BaseEnum.FAIL.getCode());
    resultBean.setMsg(msg);
    resultBean.setResultFlag(false);
    return resultBean;
  }

  public static ResultBean errorJson(String msg, Integer code) {

    ResultBean resultBean = new ResultBean();
    resultBean.setCode(code);
    resultBean.setMsg(msg);
    resultBean.setResultFlag(false);

    return resultBean;
  }

}

2. 改写controller，响应改成统一的响应bean

 @GetMapping("/allUser")
  public ResultBean getAllUser() {

    List<UserEntity> allUsers = userService.getAllUsers();

    return ResultBean.successResult(allUsers);
  }

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3. 分页插件

@Configuration
@EnableTransactionManagement
@MapperScan("com.chins.springboot.core.dao")
public class MybatisPlusConfig {

  @Bean
  PaginationInterceptor paginationInterceptor() {
    return new PaginationInterceptor();
  }
}

  @Override
  public IPage<UserEntity> getAllUsersPage(BasePage basePage) {

    Page<UserEntity> userEntityPage = new Page<>(basePage.getCurrentPage(), basePage.getPageSize());
    IPage<UserEntity> userEntityIPage = userMapper.selectPage(userEntityPage, null);

    return userEntityIPage;
  }

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