jpa Auditor 自動賦值與自定義 @CreatedBy @LastModifiedBy @CreatedDate @LastModifiedDate

 

在spring jpa audit 中,在字段或者方法上使用註解@CreatedDate@CreatedBy@LastModifiedDate@LastModifiedBy,當進行實體插入或者更新能夠自動賦值java

  • @CreatedDate 建立時間mysql

  • @CreatedBy 建立人web

  • @LastModifiedDate 更新時間spring

  • @LastModifiedBy 更新人sql

使用:mongodb

1.定義實體類,並使用註解標註字段數據庫

import lombok.Data;
import org.springframework.data.annotation.*;
import org.springframework.data.mongodb.core.mapping.Field;

import java.time.LocalDateTime;

@Data
public class BaseEntity {
  @Id private String id;
  @Field @CreatedBy private String createUserId;

  @Field @LastModifiedBy private String updateUserId;

  @Field @CreatedDate private LocalDateTime createTime; // 建立時間

  @Field @LastModifiedDate private LocalDateTime updateTime; // 修改時間
}

2.添加 AuditorAware配置,設置默認用戶app

@Configuration
@EnableMongoAuditing(auditorAwareRef = "jpaAuditorAware")//使用mongo,也能夠使用其餘,如jpa(mysql)
public class JpaAuditorAware implements AuditorAware<String> {
  @Override
  public String getCurrentAuditor() {
    return "system";
  }
}

這裏是直接設置了一個默認值,正常來講,應該使用springsecurity或者shiro,從請求token中獲取當前登陸用戶,如:dom

public final class SecurityUtils {

  private SecurityUtils() {}

  /**
   * 根據 Authorization 獲取當前登陸的用戶
   *
   * @return 返回用戶id
   */
  public static String getCurrentUserId() {
    SecurityContext securityContext = SecurityContextHolder.getContext();
    Authentication authentication = securityContext.getAuthentication();
    String userId = null;
    if (authentication != null) {
      if (authentication.getPrincipal() instanceof UserDetails) {
        UserDetails springSecurityUser = (UserDetails) authentication.getPrincipal();
        userId = springSecurityUser.getUsername();
      } else if (authentication.getPrincipal() instanceof String) {
        userId = (String) authentication.getPrincipal();
      }
    }
    return userId;
  }
}

//設置Auditor
@Component
public class SpringSecurityAuditorAware implements AuditorAware<String> {

  @Override
  public String getCurrentAuditor() {
    String userId= SecurityUtils.getCurrentUserId();
    return userId;
  }
}

3.新建 User類,繼承BaseEntityide

@Data
@Document(collection = "stu")
public class Stu extends BaseEntity 
{ String name; String clazz; }

4.UserRepository 繼承MongoRepository,鏈接mongo數據庫

測試:

@RequestMapping("/user")
  public User saveUser(String name) {
    User user = new User();
    user.setName(name);
    return userRepo.save(user);
  }

 

發現4個字段都自動賦值了。

可是有個問題,有些場景是這樣的:

    User user = new User();
    user.setName(name);
    user.setCreateUserId("hahaha");//手動設置userId

等執行完數據庫插入後,發現createUserId的值不是hahaha,仍是上面默認的system 

 

解決方法:實現Auditable接口,經過重載來自定義這些方法

@Data
public class Base extends BaseEntity implements Auditable<String, String> { 

  @Override
  public String getCreatedBy() {
    return this.getCreateUserId();
  }

  @Override
  public void setCreatedBy(String s) {
    //若是已經設置了createUserId,則取當前設置的;不然,使用當前登陸的用戶id(即參數s)   下同。
    String createUserId = !StringUtils.isEmpty(getCreateUserId()) ? getCreateUserId() : s; setCreateUserId(createUserId);
  }

  @Override
  public DateTime getCreatedDate() {
    return new DateTime(
        this.getCreateTime().atZone(ZoneId.systemDefault()).toInstant().toEpochMilli());
  }

  @Override
  public void setCreatedDate(DateTime dateTime) {
    setCreateTime(
        Instant.ofEpochMilli(dateTime.getMillis())
            .atZone(ZoneId.systemDefault())
            .toLocalDateTime());
  }

  @Override
  public String getLastModifiedBy() {
    return this.getUpdateUserId();
  }

  @Override
  public void setLastModifiedBy(String s) {
    String createUserId = !StringUtils.isEmpty(getUpdateUserId()) ? getUpdateUserId() : s;
    setUpdateUserId(createUserId);
  }

  @Override
  public DateTime getLastModifiedDate() {
    return new DateTime(
        this.getUpdateTime().atZone(ZoneId.systemDefault()).toInstant().toEpochMilli());
  }

  @Override
  public void setLastModifiedDate(DateTime dateTime) {
    setUpdateTime(
        Instant.ofEpochMilli(dateTime.getMillis())
            .atZone(ZoneId.systemDefault())
            .toLocalDateTime());
  }

  @Override
  public boolean isNew() {
    return this.getId() == null;
  }
}

 

測試:新建實體類stu,繼承Base

@Data
@Document(collection = "stu")
public class Stu extends Base {
  String name;
  String clazz;
}

web rest類:

@RequestMapping("/stu")
  public String saveStu(String name) throws JsonProcessingException {
    Stu stu = new Stu();
    stu.setName(name);
    stu.setClazz(random.nextInt() + "");
    stu.setCreateUserId(name);//自定義createUserId
    stu = stuRepo.save(stu);
    return om.writeValueAsString(stu);
  }

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