hibernate小小demo
开发流程：
1 下载并安装Hibernate
2 Hibernate配置文件详解 配置与MySQL数据库的链接与映射文件User.hbm.xml
3 生成映射文件User.hbm.xml
4 编写持久化类User.java
5 编写辅助类HibernateSessionFactory.java 负责取得和关闭Hibernate的Session对象
6 编写DAO类UserDAO.java 编写根据用户名取得用户对象的getUser()
7 编写Service类UserService.java 编写valid()函数 调用UserDAO.java的getUser()函数执行函数验证
下载并安装Hibernate
hibernate-3.0.zip
hibernate.cfg.xml配置文件:
<?xml version='1.0' encoding='UTF-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <!-- Generated by MyEclipse Hibernate Tools. --> <hibernate-configuration> <session-factory> <property name="myeclipse.connection.profile"> JDBC for MySQL </property> <property name="connection.url"> jdbc:mysql://localhost:3306/demo </property> <property name="connection.username">root</property> <property name="connection.password">root</property> <property name="connection.driver_class"> org.gjt.mm.mysql.Driver </property> <property name="dialect"> org.hibernate.dialect.MySQLDialect </property> <mapping resource="com/demo/hibernate/beans/User.hbm.xml" /> </session-factory> </hibernate-configuration>
3. User.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" > <!-- DO NOT EDIT: This is a generated file that is synchronized --> <!-- by MyEclipse Hibernate tool integration. --> <!-- Created Tue Aug 14 18:57:22 CST 2007 --> <hibernate-mapping package="com.demo.hibernate.beans"> <class name="User" table="user"> <id name="id" column="ID" type="integer"> <generator class="native"/> </id> <property name="username" column="username" type="string" /> <property name="password" column="password" type="string" /> <property name="email" column="email" type="string" /> </class> </hibernate-mapping>
4.User.java:
package com.demo.hibernate.beans;
public class User {
private java.lang.Integer id;
private java.lang.String username;
private java.lang.String password;
private java.lang.String email;
public java.lang.String getEmail() {
return email;
}
public void setEmail(java.lang.String email) {
this.email = email;
}
public java.lang.Integer getId() {
return id;
}
public void setId(java.lang.Integer id) {
this.id = id;
}
public java.lang.String getPassword() {
return password;
}
public void setPassword(java.lang.String password) {
this.password = password;
}
public java.lang.String getUsername() {
return username;
}
public void setUsername(java.lang.String username) {
this.username = username;
}
}
5.HibernateSessionFactory.java
package com.demo.hibernate.util;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;
/**
* Configures and provides access to Hibernate sessions, tied to the
* current thread of execution. Follows the Thread Local Session
* pattern, see {@link http://hibernate.org/42.html}.
*/
public class HibernateSessionFactory {
/**
* Location of hibernate.cfg.xml file.
* NOTICE: Location should be on the classpath as Hibernate uses
* #resourceAsStream style lookup for its configuration file. That
* is place the config file in a Java package - the default location
* is the default Java package.
* Examples:
* CONFIG_FILE_LOCATION = "/hibernate.conf.xml".
* CONFIG_FILE_LOCATION = "/com/foo/bar/myhiberstuff.conf.xml".
*/
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
/** Holds a single instance of Session */
private static final ThreadLocal threadLocal = new ThreadLocal();
/** The single instance of hibernate configuration */
private static final Configuration cfg = new Configuration();
/** The single instance of hibernate SessionFactory */
private static org.hibernate.SessionFactory sessionFactory;
/**
* Returns the ThreadLocal Session instance. Lazy initialize
* the SessionFactory if needed.
*
* @return Session
* @throws HibernateException
*/
public static Session currentSession() throws HibernateException {
Session session = (Session) threadLocal.get();
if (session == null) {
if (sessionFactory == null) {
try {
cfg.configure(CONFIG_FILE_LOCATION);
sessionFactory = cfg.buildSessionFactory();
}
catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
session = sessionFactory.openSession();
threadLocal.set(session);
}
return session;
}
/**
* Close the single hibernate session instance.
*
* @throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close();
}
}
/**
* Default constructor.
*/
private HibernateSessionFactory() {
}
}
6.UserDAO.java
package com.demo.hibernate.dao;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.demo.hibernate.beans.User;
import com.demo.hibernate.util.HibernateSessionFactory;
public class UserDAO {
public User getUser(String username) throws HibernateException {
Session session = null;
Transaction tx = null;
User user = null;
try {
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
Query query = session.createQuery("from User where username=?");
query.setString(0, username.trim());
user = (User)query.uniqueResult();
query = null;
tx.commit ();
}catch(HibernateException e){
throw e;
}finally{
if (tx!=null) {
tx.rollback();
}
HibernateSessionFactory.closeSession();
}
return user;
}
}
7.UserService.java
package com.demo.hibernate.service;
import com.demo.hibernate.beans.User;
import com.demo.hibernate.dao.UserDAO;
public class UserService {
public boolean valid(String username, String password) {
UserDAO test = new UserDAO();
User user = test.getUser("admin");
if(user.getPassword().equals(password)) {
return true;
} else {
return false;
}
}
public static void main(String[] args) {
UserService service = new UserService();
boolean login = service.valid("admin", "admin");
System.out.println("验证结果："+login);
}
}