发布于 2016-07-11 08:48:28 | 71 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Java函数式编程，程序狗速度看过来！

Java程序设计语言

java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言，是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台（即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se)）的总称。

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这篇文章主要介绍了java扩展Hibernate注解支持java8新时间类型,需要的朋友可以参考下

扩展Hibernate注解@CreationTimestamp，@UpdateTimestamp支持Java8新的时间类型
Hibernate version: 4.3.5.Final

package com.hibernate.annotation;

import org.hibernate.HibernateException;
import org.hibernate.tuple.AnnotationValueGeneration;
import org.hibernate.tuple.ValueGenerator;

import java.lang.annotation.Annotation;
import java.sql.Time;
import java.sql.Timestamp;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.Calendar;
import java.util.Date;

/**
 * Created with IntelliJ IDEA.
 * User: ZhongGang
 * Date: 14-4-16
 * Time: 上午11:40
 * <p/>
 * 支持Java8新的时间包
 *
 * @see java.time.LocalDateTime
 * @see java.time.LocalDate
 * @see java.time.LocalTime
 */
public abstract class AbstractTimeGeneration<A extends Annotation> implements AnnotationValueGeneration<A> {
    protected ValueGenerator<?> generator;

    @Override
    public void initialize(A annotation, Class<?> propertyType) {
        if (LocalDateTime.class.isAssignableFrom(propertyType)) {
            generator = (session, owner) -> LocalDateTime.now();
        } else if (LocalDate.class.isAssignableFrom(propertyType)) {
            generator = (session, owner) -> LocalDate.now();
        } else if (LocalTime.class.isAssignableFrom(propertyType)) {
            generator = (session, owner) -> LocalTime.now();
        } else if (java.sql.Date.class.isAssignableFrom(propertyType)) {
            generator = (session, owner) -> new java.sql.Date(new Date().getTime());
        } else if (Time.class.isAssignableFrom(propertyType)) {
            generator = (session, owner) -> new Time(new Date().getTime());
        } else if (Timestamp.class.isAssignableFrom(propertyType)) {
            generator = (session, owner) -> new Timestamp(new Date().getTime());
        } else if (Date.class.isAssignableFrom(propertyType)) {
            generator = (session, owner) -> new Date();
        } else if (Calendar.class.isAssignableFrom(propertyType)) {
            generator = (session, owner) -> {
                Calendar calendar = Calendar.getInstance();
                calendar.setTime(new Date());
                return calendar;
            };
        } else {
            throw new HibernateException("Unsupported property type for generator annotation " + annotation.getClass().getSimpleName());
        }
    }

    @Override
    public ValueGenerator<?> getValueGenerator() {
        return generator;
    }

    @Override
    public boolean referenceColumnInSql() {
        return false;
    }

    @Override
    public String getDatabaseGeneratedReferencedColumnValue() {
        return null;
    }
}