项目问题总结 - 《Java 学习笔记》

错误要定义枚举类

实例：

    if (memberFeedback == null) {
      // TODO 这种定义错误枚举呀，放在home.enums.ErrorStatus，这个项目分包没分对，所有看起来怪怪的，算了
      // 已修正
      return WebResult.createFailedResult(ErrorStatus.MEMBER_FEEDBACK_ID_NULL.getCode(), ErrorStatus.MEMBER_FEEDBACK_ID_NULL.getMsg());
    }

/*
 * 警告：
 * 本源代码所有权归广州慧扬健康科技有限公司(下称“本公司”)所有，已采取保密措施加以保护。受《中华人民共和国刑法》、
 * 《反不正当竞争法》和《国家工商行政管理局关于禁止侵犯商业秘密行为的若干规定》等相关法律法规的保护。未经本公司书面
 * 许可，任何人披露、使用或者允许他人使用本源代码，必将受到相关法律的严厉惩罚。
 * Warning:
 * The ownership of this source code belongs to Guangzhou Wisefly Technology Co., Ltd.(hereinafter referred to as "the company"),
 * which is protected by the criminal law of the People's Republic of China, the anti unfair competition law and the
 * provisions of the State Administration for Industry and Commerce on prohibiting the infringement of business secrets, etc.
 * Without the written permission of the company, anyone who discloses, uses or allows others to use this source code
 * will be severely punished by the relevant laws.
 */
package cn.wisefly.group.enums;
/**
 * 用户中心错误响应报文枚举类
 */
public enum ErrorStatus {
  GET_ID_FAILED(-10001, "获取雪花全局ID失败"),
  DB_OPERATE_FAILED(-10002, "执行数据写入操作失败"),
  ACCOUNT_IS_NULL(-10003, "登录账号不允许为空"),
  TOKEN_IS_NULL(-10004, "登录令牌不允许为空"),
  DATA_NULL(-10005, "待操作的数据为空"),
  ACCOUNT_NOT_EXISIT(-10006, "账户不存在"),
  ACCOUNT_PWD_ERROR(-10007, "账户或密码错误"),
  RANDOM_IS_NULL(-10008, "登录随机数不允许为空"),
  REGISTER_FAILED(-10009, "注册失败"),
  ACCOUNT_REGISTERED(-10010, "账户已注册"),
  INVALID_TOKEN(-10011, "无效token，未能找到用户信息"),
  ACCESSTOKEN_IS_NULL(-10012, "token为空"),
  NAME_IS_NULL(-10013, "姓名不允许为空"),
  CALL_AUTHORITY_FAILED(-10014, "调用权限中心接口失败"),
  MOBILE_IS_NULL(-10015, "手机不允许为空"),
  PWD_ERROR_OUTPASE(-10016, "超过密码错误次数"),
  RIGHTS_INFO_MISMATCH(-10017, "权限与用户不匹配"),
  ACCOUNT_LGOIN_COUNT_FULL(-10018, "该账号可登录人数已满"),
  ACCOUNT_LOCK(-10019, "账户被锁定，操作失败"),
  PASSWORD_ERROR(-10020, "密码不符合规则"),
  ACCOUNT_NOT_EXIST(-10021, "账户不存在"),
  ACCOUNT_CONTAIN_SPECIAL_CHAR(-10022, "账户包含特殊字符串"),
  MEMBER_FEEDBACK_ID_NULL(-10023, "feedbackId不存在"),
  MEMBER_FEEDBACK_STATUS_FULL(-10024, "反馈处理已存在"),
  ;
  private int code;
  private String msg;
  ErrorStatus(int code, String msg) {
    this.code = code;
    this.msg = msg;
  }
  public int getCode() {
    return code;
  }
  public String getMsg() {
    return msg;
  }
}

判空

list != null && list.size() > 0 => .size()应该放到后面，否则.size()会空指针，注意顺序，判空要利用工具类
实例：

CollectionUtils.isNotEmpty(feedbackProcessingImageDTOList)

常量定义枚举类

实例：

    //更改反馈状态 TODO 定义常量枚举，不要直接用 1
    // 已修正
    memberFeedback.setStatus(FeedbackCode.FEEDBACK_PROCESSED);

package cn.wisefly.common.constant;
/**
 * 反馈状态码
 *
 * @author ：0391
 * @date ：Created in 2021-08-26
 */
public class FeedbackCode {
  /**
   * 反馈未处理
   */
  public static final int FEEDBACK_NOT_PROCESSED = 0;
  /**
   * 反馈已回复
   */
  public static final int FEEDBACK_PROCESSED = 1;
}

model类中已经自动生成了常量，不需要直接使用字符串

实例：

    // TODO 这里就不要用直接用字符串啦，你会发现 TMemberFeedback 这个类里面，已经生成了静态常量给你用了
    // 已修正
    if (param.getPhoneNumber() != null) {
      queryWrapper.like(TMemberFeedback.FIELD_PHONE_NUMBER, param.getPhoneNumber());
    }

package cn.wisefly.advice.model;
import cn.wisefly.framework.common.dto.helper.LongJsonDeserializer;
import cn.wisefly.framework.common.dto.helper.LongJsonSerializer;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import java.util.Date;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
 * 用户反馈表
 *
 * @author admin
 * @date 2021-08-13 10:46:40.000
 **/
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
@ApiModel(value = "用户反馈表")
public class TMemberFeedback {
  public static final String FIELD_ID = "id";
  public static final String FIELD_MEMBER_ID = "member_id";
  public static final String FIELD_MEMBER_NAME = "member_name";
  public static final String FIELD_PHONE_NUMBER = "phone_number";
  public static final String FIELD_TYPE = "type";
  public static final String FIELD_SUBMIT_DATE = "submit_date";
  public static final String FIELD_TITLE = "title";
  public static final String FIELD_CONTENT = "content";
  public static final String FIELD_STATUS = "status";
  public static final String FIELD_CREATE_USER_ID = "create_user_id";
  public static final String FIELD_CREATE_USER_NAME = "create_user_name";
  public static final String FIELD_CREATE_TIME = "create_time";
  public static final String FIELD_LAST_USER_ID = "last_user_id";
  public static final String FIELD_LAST_USER_NAME = "last_user_name";
  public static final String FIELD_LAST_TIME = "last_time";
  public static final String FIELD_DELETE_FLAG = "delete_flag";
  /**
   * 主键
   */
  @ApiModelProperty(value = "主键")
  @JsonSerialize(using = LongJsonSerializer.class)
  @JsonDeserialize(using = LongJsonDeserializer.class)
  private Long id;
  /**
   * 用户id
   */
  @ApiModelProperty(value = "用户id")
  private Long memberId;
  /**
   * 用户匿名后的姓名
   */
  @ApiModelProperty(value = "用户匿名后的姓名")
  private String memberName;
  /**
   * 手机号
   */
  @ApiModelProperty(value = "手机号")
  private Long phoneNumber;
  /**
   * 反馈类型
   */
  @ApiModelProperty(value = "反馈类型")
  private Integer type;
  /**
   * 提交日期
   */
  @ApiModelProperty(value = "提交日期")
  private Date submitDate;
  /**
   * 标题
   */
  private String title;
  /**
   * 内容
   */
  @ApiModelProperty(value = "内容")
  private String content;
  /**
   * 状态
   */
  @ApiModelProperty(value = "状态")
  private Integer status;
  /**
   * 创建人
   */
  @ApiModelProperty(value = "创建人", hidden = true)
  @JsonSerialize(using = LongJsonSerializer.class)
  @JsonDeserialize(using = LongJsonDeserializer.class)
  private Long createUserId;
  /**
   * 创建人姓名
   */
  @ApiModelProperty(value = "创建人姓名", hidden = true)
  private String createUserName;
  /**
   * 创建时间
   */
  @ApiModelProperty(value = "创建时间", hidden = true)
  private Date createTime;
  /**
   * 最后修改人
   */
  @ApiModelProperty(value = "最后修改人", hidden = true)
  @JsonSerialize(using = LongJsonSerializer.class)
  @JsonDeserialize(using = LongJsonDeserializer.class)
  private Long lastUserId;
  /**
   * 最后修改人
   */
  @ApiModelProperty(value = "最后修改人", hidden = true)
  private String lastUserName;
  /**
   * 最后修改时间
   */
  @ApiModelProperty(value = "最后修改时间", hidden = true)
  private Date lastTime;
  /**
   * 是否删除(1是,0否)
   */
  @ApiModelProperty(value = "是否删除(1是,0否)", hidden = true)
  private Integer deleteFlag;
}

Mybatis语法
日期类 Calendar

实例：

Calendar calendar = Calendar.getInstance();
//设置日期为昨天
calendar.add(Calendar.DATE, -1);
//设置为0h 0min 0s
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);

7.IDE 的 text file encoding 设置为 UTF-8; IDE 中文件的换行符使用 Unix 格式，不要使用 Windows 格式