在Spring JPA中，在实体bean的属性上加注解@CreatedDate、@CreatedBy、@LastModifiedDate、@LastModifiedBy，可以再实体插入数据库时进行设置值，这样以来，在对普通实体类的添加、修改操作时，就不用关心创建时间、更新时间这些信息了。本文以SpringBoot为例


1、引入依赖 

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>


2、实体bean

注意：

2.1、@MappedSuperclass需要添加，因为一般这种domain类都是需要被继承的，为了在子类对象中能取到父类对象的属性，所以必须得加上；

2.3、@EntityListeners(AuditingEntityListener.class)：需要开启domain对象的监听，否则无法监测到对象的修改

BaseEntity.java

package com.imddy.layuiadmin.common;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;
import lombok.Data;
import org.springframework.data.annotation.CreatedBy;
import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.annotation.LastModifiedBy;
import org.springframework.data.annotation.LastModifiedDate;
import org.springframework.data.jpa.domain.support.AuditingEntityListener;

import javax.persistence.Column;
import javax.persistence.EntityListeners;
import javax.persistence.MappedSuperclass;
import java.io.Serializable;
import java.time.LocalDateTime;

@Data
@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
public abstract class BaseEntity implements Serializable {
    private static final long serialVersionUID = 1L;

    @CreatedBy
    @Column(name = "create_by", nullable = false, updatable = false)
    @JsonIgnore
    private String createBy;

    @CreatedDate
    @Column(name = "create_time", nullable = false, updatable = false)
    @JsonIgnore
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    private LocalDateTime createTime;

    @LastModifiedBy
    @Column(name = "update_by", nullable = false)
    @JsonIgnore
    private String updateBy;

    @LastModifiedDate
    @Column(name = "update_time", nullable = false)
    @JsonIgnore
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    private LocalDateTime updateTime;
}


3、实现AuditorAware接口

ShiroAuditorAware.java

package com.imddy.layuiadmin.auditoraware;

import org.apache.shiro.SecurityUtils;
import org.springframework.data.domain.AuditorAware;
import org.springframework.stereotype.Component;

import java.util.Optional;

@Component
public class ShiroAuditorAware implements AuditorAware<String> {

    @Override
    public Optional<String> getCurrentAuditor() {
        //返回会话中或者指定的用户名
        //自己去处理获取用户名
        //return Optional.of((String) SecurityUtils.getSubject().getPrincipal());
        return Optional.of("用户名");
        /** 用于审计的用户的名称 */
    }

}


4、启用JPA Audit注解@EnableJpaAuditing（xxxApplication.java也就是项目的启动类中）

EnableJpaAuditingConfig.java

package com.imddy.layuiadmin.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;

@Configuration
@EnableJpaAuditing(auditorAwareRef="shiroAuditorAware")
public class EnableJpaAuditingConfig {

}

//1、这种是全部开启

//@EnableJpaAuditing

//2、这种是指定开启

//@EnableJpaAuditing(auditorAwareRef="shiroAuditorAware")