eclipse配置hibernate

hibernate相对于spring配置还是略显繁琐的：
对于Eclipse要求:
                           EclipseEE
数据库，我选用的是
                           mysql

新件项目：需要建成：dynamic web project

在WEB-INF/lib下需要的jar包:


整个项目的目录结构:



源码：
HelloWorld.java

package com.yy.hello;

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

import persistence.*;

public class HelloWorld {
	public static void main(String[] args) {
		Session session = HibernateUtil.getSessionFactory().openSession();
		Transaction tx = session.beginTransaction();
		
		Message message = new Message("Hello World");
		Long msgId = (Long) session.save(message);
		
		tx.commit();
		session.close();
		
		HibernateUtil.shutdown();
	}
}

Message.java

package com.yy.hello;

public class Message {
	private Long id;
	private String text;
	private Message nextMessage;

	public Message(){}
	
	public Message(String text) {
		this.text = text;
	}

	public Long getId() {
		return id;
	}

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

	public String getText() {
		return text;
	}

	public void setText(String text) {
		this.text = text;
	}

	public Message getNextMessage() {
		return nextMessage;
	}

	public void setNextMessage(Message nextMessage) {
		this.nextMessage = nextMessage;
	}

}

Message.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC  
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"  
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping>
	<class name="com.yy.hello.Message" table="MESSAGES" >
		<id 
			name="id"
			column="MESSAGE_ID">
			<generator class="increment"></generator>	
		</id>
		
		<property name="text" column="MESSAGE_TEXT"></property>
		
		<many-to-one 
			name="nextMessage"
			cascade="all"
			column="NEXT_MESSAGE_ID"
			foreign-key="FK_NEXT_MESSAGE" />

	</class>
</hibernate-mapping>         

HibernateUtil.java

package persistence;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;



public class HibernateUtil {
	
	private static SessionFactory sessionFactory;
	
	static{
		try{
			sessionFactory = new Configuration()
									.configure()
									.buildSessionFactory();
		} catch (Throwable ex) {
			throw new ExceptionInInitializerError(ex);
		}
	}
	
	public static SessionFactory getSessionFactory(){
		return sessionFactory;
	}
	
	public static void shutdown(){
		getSessionFactory().close();
	}
}

hibernate.cfg.xml

<!DOCTYPE hibernate-configuration SYSTEM   
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory>
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_text</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">root</property>
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
		<!-- 让hibernate自动生成表 -->
		<property name="hibernate.hbm2ddl.auto">create</property>
		
		<!-- use the C3P0 connection pool provider -->
		<property name="hibernate.c3p0.min_size">5</property>
		<property name="hibernate.c3p0.max_size">20</property>
		<property name="hibernate.c3p0.timeout">300</property>
		<property name="hibernate.c3p0.max_statements">50</property>
		<property name="hibernate.c3p0.idle_test_period">3000</property>
		
		<!-- show and print nice SQL on stdout -->
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		
		<!-- List of XML mapping files -->
		<mapping resource="com/yy/hello/Message.hbm.xml" />
	</session-factory>
</hibernate-configuration>       

log4j.properties

log4j.rootLogger=DEBUG,stdout,R

log4j.logger.org=ERROR, A1

log4j.logger.com.gc.action=DEBUG,A2

log4j.appender.A1=org.apache.log4j.RollingFileAppender
log4j.appender.A1.File=org.log
log4j.appender.A1.MaxFileSize=500KB
log4j.appender.A1.MaxBackupIndex=50
log4j.appender.A1.Append=true
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d{ISO8601} - [%p] [%C{1}] - %m%n


log4j.appender.A2=org.apache.log4j.RollingFileAppender
log4j.appender.A2.File=gc.log
log4j.appender.A2.MaxFileSize=500KB
log4j.appender.A2.MaxBackupIndex=50
log4j.appender.A2.Append=true
log4j.appender.A2.layout=org.apache.log4j.PatternLayout
log4j.appender.A2.layout.ConversionPattern=%d{ISO8601} - [%p] [%C{1}] - %m%n

#--------------------stdout--------------------------------
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} %c - %m%n

#--------------------R--------------------------------
#log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
#this log file will be stored in web server's /bin directory,modify to your path which want to store.
log4j.appender.R.File=gf.log
#log4j.appender.R.datePattern='.'yyyy-MM-dd-HH-mm
log4j.appender.R.datePattern='.'yyyy-MM-dd
log4j.appender.R.append=true
## Keep one backup file
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} %c - %m%n
#[%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

注意事项：
hibernate.cfg.xml放在源代码目录中，但是处在任何包之外的。
log4j.properties是放在WEB-INF/classes文件夹下的。
编译的时候，编译HelloWorld.java文件，用Java Application运行。
你需要在mysql中先建立好数据库（但在此不需要预先建立好表）。

至此，登录mysql，便可以发现表已经自动声称，并已经存入了数据。


补充：
将上面的改为注解，在此我将需要修改，并且改后的源文件贴出，读者可自行比较其中的不同之处：
Message.java

package com.yy.hello;

import javax.persistence.*;

@Entity
@Table(name = "TAB_AN")
public class Message {
	
	@Id
	@GeneratedValue
	@Column(name = "MESSAGE_ID")
	private Long id;
	
	@Column(name = "MESSAGE_TEXT")
	private String text;
	
	@ManyToOne(cascade = CascadeType.ALL)
	@JoinColumn(name = "NEXT_TAB_AN")
	private Message nextMessage;

	public Message(){}
	
	public Message(String text) {
		this.text = text;
	}

	public Long getId() {
		return id;
	}

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

	public String getText() {
		return text;
	}

	public void setText(String text) {
		this.text = text;
	}

	public Message getNextMessage() {
		return nextMessage;
	}

	public void setNextMessage(Message nextMessage) {
		this.nextMessage = nextMessage;
	}

}

hibernate.cfg.xml

<!DOCTYPE hibernate-configuration SYSTEM   
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory>
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/HBDB</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">root</property>
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
		<!-- 让hibernate自动生成表 -->
		<property name="hibernate.hbm2ddl.auto">create</property>
		
		<!-- use the C3P0 connection pool provider -->
		<property name="hibernate.c3p0.min_size">5</property>
		<property name="hibernate.c3p0.max_size">20</property>
		<property name="hibernate.c3p0.timeout">300</property>
		<property name="hibernate.c3p0.max_statements">50</property>
		<property name="hibernate.c3p0.idle_test_period">3000</property>
		
		<!-- show and print nice SQL on stdout -->
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		
		<!-- List of XML mapping files -->
		<mapping class="com.yy.hello.Message" />
			<mapping package="com/yy/hello" />
	</session-factory>
</hibernate-configuration>       

还需要手动删除Message.hbm.xml文件，不需要导入新的包，编译，运行，在数据库里面会发现已经有了新的TAB_AN。