吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记：Hibernate组件作为Map的索引

<?xml version="1.0" encoding="GBK"?>
<project name="hibernate" basedir="." default="">
    <property name="src" value="src"/>
    <property name="dest" value="classes"/>

    <path id="classpath">
        <fileset dir="../../lib">
            <include name="**/*.jar"/>
        </fileset>
        <pathelement path="${dest}"/>
    </path>

    <target name="compile" description="Compile all source code">
        <delete dir="${dest}"/>
        <mkdir dir="${dest}"/>
        <copy todir="${dest}">
            <fileset dir="${src}">
                <exclude name="**/*.java"/>
            </fileset>        
        </copy>
        <javac destdir="${dest}" debug="true" includeantruntime="yes"
            deprecation="false" optimize="false" failonerror="true">
            <src path="${src}"/>
            <classpath refid="classpath"/>
            <compilerarg value="-Xlint:deprecation"/>
        </javac>
    </target>

    <target name="run" description="Run the main class" depends="compile">
        <java classname="lee.PersonManager" fork="yes" failonerror="true">
            <classpath refid="classpath"/>
        </java>
    </target>

</project>

<?xml version="1.0" encoding="GBK"?>
<!-- 指定Hibernate配置文件的DTD信息 -->
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<!-- hibernate-configuration是配置文件的根元素 -->
<hibernate-configuration>
    <session-factory>
        <!-- 指定连接数据库所用的驱动 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <!-- 指定连接数据库的url，其中hibernate是本应用连接的数据库名 -->
        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
        <!-- 指定连接数据库的用户名 -->
        <property name="connection.username">root</property>
        <!-- 指定连接数据库的密码 -->
        <property name="connection.password">32147</property>
        <!-- 指定连接池里最大连接数 -->
        <property name="hibernate.c3p0.max_size">20</property>
        <!-- 指定连接池里最小连接数 -->
        <property name="hibernate.c3p0.min_size">1</property>
        <!-- 指定连接池里连接的超时时长 -->
        <property name="hibernate.c3p0.timeout">5000</property>
        <!-- 指定连接池里最大缓存多少个Statement对象 -->
        <property name="hibernate.c3p0.max_statements">100</property>
        <property name="hibernate.c3p0.idle_test_period">3000</property>
        <property name="hibernate.c3p0.acquire_increment">2</property>
        <property name="hibernate.c3p0.validate">true</property>
        <!-- 指定数据库方言 -->
        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <!-- 根据需要自动创建数据库 -->
        <property name="hbm2ddl.auto">update</property>
        <!-- 显示Hibernate持久化操作所生成的SQL -->
        <property name="show_sql">true</property>
        <!-- 将SQL脚本进行格式化后再输出 -->
        <property name="hibernate.format_sql">true</property>
        <!-- 罗列所有持久化类的类名 -->
        <mapping class="org.crazyit.app.domain.Person"/>
    </session-factory>
</hibernate-configuration>

package org.crazyit.app.domain;

import java.util.*;
import javax.persistence.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
@Entity
@Table(name="person_inf")
public class Person
{
    // 标识属性
    @Id @Column(name="person_id")
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;
    private int age;
    // 集合属性nickPower
    @ElementCollection(targetClass=Integer.class)
    @CollectionTable(name="nick_power_inf", joinColumns
        =@JoinColumn(name="person_id" , nullable=false))
    @Column(name="nick_power" , nullable=false)
    // 指定Map key的类型
    @MapKeyClass(Name.class)
    private Map<Name , Integer> nickPower
        = new HashMap<Name , Integer>();

    // id的setter和getter方法
    public void setId(Integer id)
    {
        this.id = id;
    }
    public Integer getId()
    {
        return this.id;
    }

    // age的setter和getter方法
    public void setAge(int age)
    {
        this.age = age;
    }
    public int getAge()
    {
        return this.age;
    }

    // nickPower的setter和getter方法
    public void setNickPower(Map<Name , Integer> nickPower)
    {
        this.nickPower = nickPower;
    }
    public Map<Name , Integer> getNickPower()
    {
        return this.nickPower;
    }
}

package org.crazyit.app.domain;

import javax.persistence.*;
import org.hibernate.annotations.Parent;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
@Embeddable
public class Name
{
    // 定义first成员变量
    @Column(name="person_firstname")
    private String first;
    // 定义last成员变量
    @Column(name="person_lastname")
    private String last;
    // 引用拥有该Name的Person对象
    @Parent
    private Person owner;

    // 无参数的构造器
    public Name()
    {
    }
    // 初始化全部成员变量的构造器
    public Name(String first , String last)
    {
        this.first = first;
        this.last = last;
    }

    // first的setter和getter方法
    public void setFirst(String first)
    {
        this.first = first;
    }
    public String getFirst()
    {
        return this.first;
    }

    // last的setter和getter方法
    public void setLast(String last)
    {
        this.last = last;
    }
    public String getLast()
    {
        return this.last;
    }

    // owner的setter和getter方法
    public void setOwner(Person owner)
    {
        this.owner = owner;
    }
    public Person getOwner()
    {
        return this.owner;
    }
    // 重写equals()方法，根据first、last进行判断
    public boolean equals(Object obj)
    {
        if (this == obj)
        {
            return true;
        }
        if (obj != null && obj.getClass() == Name.class)
        {
            Name target = (Name)obj;
            return target.getFirst().equals(getFirst())
                && target.getLast().equals(getLast());
        }
        return false;
    }
    // 重写hashCode方法，根据first、last计算hashCode值
    public int hashCode()
    {
        return getFirst().hashCode() * 31
            + getLast().hashCode();
    }
}

package lee;

import org.hibernate.Transaction;
import org.hibernate.Session;

import java.util.*;

import org.crazyit.app.domain.*;

/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class PersonManager
{
	public static void main(String[] args)
	{
		PersonManager mgr = new PersonManager();
		mgr.createAndStorePerson();
		HibernateUtil.sessionFactory.close();
	}
	private void createAndStorePerson()
	{
		Session session = HibernateUtil.currentSession();
		Transaction tx = session.beginTransaction();
		// 创建Person对象
		Person person = new Person();
		person.setAge(21);
		// 向Map集合里放入Name对象
		person.getNickPower().put(new Name("Wawa" , "Wawa") , 92);
		person.getNickPower().put(new Name("crazyit.org" , "疯狂Java联盟") , 96);
		session.save(person);
		tx.commit();
		HibernateUtil.closeSession();
	}
}

　　

package lee;

import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.service.*;
import org.hibernate.boot.registry.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class HibernateUtil
{
    public static final SessionFactory sessionFactory;

    static
    {
        try
        {
            // 使用默认的hibernate.cfg.xml配置文件创建Configuration实例
            Configuration cfg = new Configuration()
                .configure();
            // 以Configuration实例来创建SessionFactory实例
            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
                .applySettings(cfg.getProperties()).build();
            sessionFactory = cfg.buildSessionFactory(serviceRegistry);
        }
        catch (Throwable ex)
        {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    // ThreadLocal可以隔离多个线程的数据共享，因此不再需要对线程同步
    public static final ThreadLocal<Session> session
        = new ThreadLocal<Session>();

    public static Session currentSession()
        throws HibernateException
    {
        Session s = session.get();
        // 如果该线程还没有Session,则创建一个新的Session
        if (s == null)
        {
            s = sessionFactory.openSession();
            // 将获得的Session变量存储在ThreadLocal变量session里
            session.set(s);
        }
        return s;
    }

    public static void closeSession()
        throws HibernateException
    {
        Session s = session.get();
        if (s != null)
            s.close();
        session.set(null);
    }
}