自动将日期存入数据库

我想将文章存储在我的表中，我希望自动生成发布日期并将其存储在数据库中。publishedDate每当我添加文章时，我的文章表中的列都会显示 NULL。我想自动插入日期，我该怎么做？我的实体类和 JSP 文件中有以下代码

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

pageEncoding="ISO-8859-1"%>

<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%@page import="java.util.Date" %>

<jsp:useBean id="now" class="java.util.Date" />

<c:url value="/admin/article/save" var="url"></c:url>

<form:form class="form-horizontal" action="${url}" modelAttribute="article"

method="POST" enctype="multipart/form-data" style="margin-top:5rem;" >

<form:hidden path="articleViews" value="${article.articleViews}" />

<form:hidden path="publishedDate" id="publishedDate" value="${now}" />

<form:hidden path="articleId" value="${article.articleId}" />

import java.io.Serializable;

import java.util.Comparator;

import java.util.Date;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.Table;

import javax.persistence.Transient;

import org.hibernate.annotations.Generated;

import org.hibernate.annotations.GenerationTime;

import org.springframework.web.multipart.MultipartFile;

@Entity

@Table

public class Article implements Serializable,Comparator<Article>{

/**

private static final long serialVersionUID = -4756552789390263788L;

@Id

@GeneratedValue(strategy = GenerationType.AUTO)

private Long articleId;

private String articleHeading;

@Column(columnDefinition = "TEXT")

private String articleIntroduction;

@Column(columnDefinition = "TEXT")

private String articleDescription;

@Column(columnDefinition = "TEXT")

private String articleSummary;

@Transient

private MultipartFile aImage;

private String articleCategory;

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