Spring-Data-Jpa AuditingEntityListener @CreatedDate @LastModifiedDate 用法

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import org.hibernate.validator.constraints.NotBlank;
import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.annotation.LastModifiedDate;
import org.springframework.data.jpa.domain.support.AuditingEntityListener;

import javax.persistence.*;
import java.util.Date;

/**
*
*/
@Entity
@Table(name = "notes")
@EntityListeners(AuditingEntityListener.class)
@JsonIgnoreProperties(value = {"createdAt", "updatedAt"},
allowGetters = true)
public class Note {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

@NotBlank
private String title;

@NotBlank
private String content;

@Column(nullable = false, updatable = false)
@Temporal(TemporalType.TIMESTAMP)
@CreatedDate
private Date createdAt;

@Column(nullable = false)
@Temporal(TemporalType.TIMESTAMP)
@LastModifiedDate
private Date updatedAt;

public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getContent() {
return content;
}

public void setContent(String content) {
this.content = content;
}

public Date getCreatedAt() {
return createdAt;
}

public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}

public Date getUpdatedAt() {
return updatedAt;
}

public void setUpdatedAt(Date updatedAt) {
this.updatedAt = updatedAt;
}

}

如上示例代码，@EntityListeners(AuditingEntityListener.class) 是用于监听实体类添加或者删除操作的。@JsonIgnoreProperties(value = {"createdAt", "updatedAt"},
allowGetters = true) 这个注解是用于在除了在获取createAt,updateAt属性时进行操作，其他创建和更新操作都由jpa完成@Column(nullable = false, updatable = false) 其中updatable = false表示不进行更新操作@CreatedDate 表示该字为创建时间字段，在这个实体被insert时，设置值；@LastModifiedDate同理