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_Interceptor

<?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.UserManager" 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">200</property>
        <!-- 指定连接池里最小连接数 -->
        <property name="hibernate.c3p0.min_size">2</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>
        <!-- 指定根据当前线程来界定上下文相关Session -->
        <property name="hibernate.current_session_context_class">thread</property>
        <!-- 罗列所有持久化类的类名 -->
        <mapping class="org.crazyit.app.domain.User"/>
    </session-factory>
</hibernate-configuration>

package lee;

import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.service.*;
import org.hibernate.boot.registry.*;

import java.util.*;

import org.crazyit.app.domain.*;
import org.crazyit.common.hibernate.interceptor.MyInterceptor;

/**
 * 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 UserManager
{
    static Configuration cfg = new Configuration()
        // 加载hibernate.cfg.xml配置文件
        .configure()
        // 设置启用全局拦截器
        .setInterceptor(new MyInterceptor());
    // 以Configuration实例创建SessionFactory实例
    static ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
        .applySettings(cfg.getProperties()).build();
    static SessionFactory sf = cfg.buildSessionFactory(serviceRegistry);
    public static void main(String[] args)
    {
        UserManager mgr = new UserManager();
        mgr.testUser();
        sf.close();
    }
    private void testUser()
    {
        Session session = sf.getCurrentSession();
        Transaction tx = session.beginTransaction();
        // 创建一个User对象
        User u1 = new User();
        u1.setName("crazyit.org");
        u1.setAge(30);
        u1.setNationality("china");
        session.save(u1);
        User u = (User)session.load(User.class , 1);
        u.setName("疯狂Java联盟");
        tx.commit();
    }
}

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="user_inf")

public class User
{
    @Id @Column(name="user_id")
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;
    private String name;
    private int age;
    private String nationality;

    // 无参数的构造器
    public User()
    {
    }
    // 初始化全部成员变量的构造器
    public User(Integer id , String name , int age , String nationality)
    {
        this.id = id;
        this.name = name;
        this.age = age;
        this.nationality = nationality;
    }

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

    // name的setter和getter方法
    public void setName(String name)
    {
        this.name = name;
    }
    public String getName()
    {
        return this.name;
    }

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

    // nationality的setter和getter方法
    public void setNationality(String nationality)
    {
        this.nationality = nationality;
    }
    public String getNationality()
    {
        return this.nationality;
    }

}

package org.crazyit.common.hibernate.interceptor;

import java.util.*;
import java.io.*;

import org.hibernate.*;
import org.hibernate.type.Type;

/**
 * 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
 */
// 通常采用采用继承EmptyInterceptor来实现拦截器
public class MyInterceptor extends EmptyInterceptor
{
    // 记录修改次数
    private int updates;
    // 记录创建次数
    private int creates;

    // 当删除实体时，onDelete()方法将被调用
    public void onDelete(Object entity , Serializable id ,
        Object[] state , String[] propertyNames , Type[] types)
    {
        // do nothing
    }

    // 当把持久化实体的状态同步到数据库时，onFlushDirty()方法被调用
    public boolean onFlushDirty(Object entity , Serializable id ,
        Object[] currentState, Object[] previousState,
        String[] propertyNames, Type[] types)
    {
        // 每同步一次，修改的累加器加1
        updates++;
        for ( int i = 0; i < propertyNames.length; i++ )
        {
            if ( "lastUpdateTimestamp".equals( propertyNames[i] ) )
            {
                currentState[i] = new Date();
                return true;
            }
        }
        return false;
    }

    // 当加载持久化实体时，onLoad()方法被调用
    public boolean onLoad(Object entity , Serializable id ,
        Object[] state,String[] propertyNames,Type[] types)
    {
        for ( int i = 0; i < propertyNames.length ; i++ )
        {
            if ( "name".equals( propertyNames[i] ) )
            {
                // 输出被装载实体的name属性值
                System.out.println( state[i] );
                return true;
            }
        }
        return false;
    }

    // 保存持久化实例时候，调用该方法
    public boolean onSave(Object entity , Serializable id ,
        Object[] state,String[] propertyNames,Type[] types)
    {
        creates++;
        for ( int i = 0; i < propertyNames.length; i++ )
        {
            if ("createTimestamp".equals( propertyNames[i]))
            {
                state[i] = new Date();
                return true;
            }
        }
        return false;
    }

    // 持久化所做修改同步完成后，调用postFlush()方法
    public void postFlush(Iterator entities)
    {
        System.out.println("创建的次数： "
            + creates + ", 更新的次数： " + updates);
    }

    // 在同步持久化所做修改之前，调用preFlush方法
    public void preFlush(Iterator entities)
    {
        // do nothing
    }

    // 事务提交之前触发该方法
    public void beforeTransactionCompletion(Transaction tx)
    {
        System.out.println("事务即将结束");
    }

    // 事务提交之后触发该方法
    public void afterTransactionCompletion(Transaction tx)
    {
        System.out.println("事务已经结束");
    }
}