本例以Windows, JDK1.8, MySQL5 为基础，来演示对Hibernate5中对SessionFactory的获取。

Hibernate V5.x 相对于V 4.x 在获取 SessionFactory 上面还是存到着一些不同之处。下面来演示怎样获取SessionFactory：

通过Properties来配置信息

将属性配置以Properties的方式来设置，可以通过Properties文件，也可以直接使用Properties对象。

HibernateProUtil.java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
package com.devnp.hibernate.core.util;

import java.util.Properties;

import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.model.naming.ImplicitNamingStrategyJpaCompliantImpl;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import com.devnp.hibernate.core.model.Student;

public class HibernateProUtil {

	private static SessionFactory sessionFactory = buildSessionFactory();

	private static SessionFactory buildSessionFactory() {
		Properties properties = new Properties();
	    properties.put("hibernate.dialect","org.hibernate.dialect.MySQL5InnoDBDialect"); //数据库方言
	    properties.put("hibernate.show_sql", "true");	//是否打印SQL
	    properties.put("hibernate.hbm2ddl.auto","update"); //执行跟新，及如果表不存在则会自动创建表
	    
	    properties.put("hibernate.connection.driver_class", "com.mysql.jdbc.Driver");
	    properties.put("hibernate.connection.password", "!qaz2wsx");
	    properties.put("hibernate.connection.url", "jdbc:mysql://localhost:3306/test");
	    properties.put("hibernate.connection.username", "root");

	    /*StandardServiceRegistryBuilder standardServiceRegistryBuilder = new StandardServiceRegistryBuilder();
	    standardServiceRegistryBuilder.applySettings(properties);

	    MetadataSources metadataSources = new MetadataSources(standardServiceRegistryBuilder.build());
	    metadataSources.addAnnotatedClass(Student.class);*/
	    
	    StandardServiceRegistry serviceRegistry= new StandardServiceRegistryBuilder().applySettings(properties).build();
	    
	    MetadataSources metadataSources = new MetadataSources(serviceRegistry);
	    metadataSources.addAnnotatedClass(Student.class);
	    
	    Metadata metadata = metadataSources.getMetadataBuilder().applyImplicitNamingStrategy(
	    		ImplicitNamingStrategyJpaCompliantImpl.INSTANCE).build();
	    
	    sessionFactory = metadata.getSessionFactoryBuilder().build();  
	    
	    return sessionFactory;
	}

	public static SessionFactory getSessionFactory() {
		return sessionFactory;
	}

	public static void shutdown() {
		// Close caches and connection pools
		getSessionFactory().close();
	}
}

通过XML来配置信息

将所有配置信息配置到hibernate.cfg.xml文件当中

hibernate.cfg.xml

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.bytecode.use_reflection_optimizer">false</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">!qaz2wsx</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <property name="show_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        <mapping class="com.devnp.hibernate.core.model.Student"/>
    </session-factory>
</hibernate-configuration>

HibernateXmlUtil.java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

package com.devnp.hibernate.core.util;

import java.util.EnumSet;

import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.model.naming.ImplicitNamingStrategyJpaCompliantImpl;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.hibernate.tool.schema.TargetType;

public class HibernateXmlUtil {

	private static SessionFactory sessionFactory = buildSessionFactory();

	private static SessionFactory buildSessionFactory() {
		
	    StandardServiceRegistry serviceRegistry= new StandardServiceRegistryBuilder().configure().build();
	    
	    Metadata metadata = new MetadataSources(serviceRegistry).getMetadataBuilder().applyImplicitNamingStrategy(
	    		ImplicitNamingStrategyJpaCompliantImpl.INSTANCE).build();  
	    
	    /*MetadataSources metadataSources = new MetadataSources(serviceRegistry);
	    
	    SchemaExport schemaExport = new SchemaExport();
	    
	    schemaExport.create(EnumSet.of(TargetType.DATABASE), metadataSources.buildMetadata());
	    
	    sessionFactory = metadataSources.buildMetadata().buildSessionFactory();*/
	    
	    sessionFactory = metadata.getSessionFactoryBuilder().build();  
	    
	    return sessionFactory;
	}

	public static SessionFactory getSessionFactory() {
		return sessionFactory;
	}

	public static void shutdown() {
		// Close caches and connection pools
		getSessionFactory().close();
	}
}

关于更多属性配置可以参考官方文档：

https://docs.jboss.org/hibernate/orm/5.0/manual/en-US/html/ch03.html