J2EE for Intellij Idea Hibernate开发实例
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Hibernate 的自动建表技术，本例简单，只为通过自动建表技术体现HIbernate的运行原理以及配置过程。
一：新建一个Java web 应用
1.导入servlet的jar包和jsp-api的jar包。
2.将数据库连接器的jar包导入。
3.最后导入hibernate的jar包（可以通过idea自动下载）。官网下载
二：代码编写：
1》index.jsp
<%-- Created by IntelliJ IDEA. User: kekekekekeshi Date: 17-7-13 Time: 下午3:14 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html> <head> <title>注册</title> </head> <body> <form action="CustomerServlet" method="post" onsubmit="return save();"> <table align="center" border="0" cellpadding="3" cellspacing="1" width="500"> <tr> <td align="right">用 户 名：</td> <td><input id="username" name="username" type="text" class="box1"></td> </tr> <tr> <td align="right">密 码：</td> <td><input id="password" name="password" type="password" class="box1"></td> </tr> <tr> <td align="right">确认密码：</td> <td><input id="repassword" name="repassword" type="password" class="box1"></td> </tr> <tr> <td align="right">年 龄:</td> <td><input id="age" name="age" type="text" class="box1"></td> </tr> <tr> <td align="right">性 别：</td> <td> <input name="sex" type="radio" value="1" checked="checked">男 <input type="radio" name="sex" value="0">女 </td> </tr> <tr> <td align="right">描 述：</td> <td><textarea name="description" cols="30" rows="5"></textarea> </td> </tr> <tr> <td colspan="2" align="center" height="50"> <input type="submit" value="注册"> <input type="reset" value="重置"> </td> </tr> </table> </form> </body></html>2》result.jsp
<%-- Created by IntelliJ IDEA. User: kekekekekeshi Date: 17-7-13 Time: 下午4:46 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>信息</title></head><body> ${requestScope.info}</body></html>3》src/me/hibernate/util/HibernateUtil.java
package me.hibernate.util;import org.hibernate.HibernateException;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.boot.Metadata;import org.hibernate.boot.MetadataSources;import org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl;import org.hibernate.boot.registry.StandardServiceRegistry;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;/** * Created by kekekekekeshi on 17-7-13. */public class HibernateUtil { private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>(); private static SessionFactory sessionFactory = null; static { try{ StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() .configure() .build(); Metadata metadata = new MetadataSources(serviceRegistry) .getMetadataBuilder() .applyImplicitNamingStrategy(ImplicitNamingStrategyComponentPathImpl.INSTANCE) .build(); sessionFactory = metadata .getSessionFactoryBuilder() .build(); }catch (Exception e){ System.err.println("创建会话工厂失败！"); e.printStackTrace(); } } /* * 获取session * @return Session * @throws HibernateException * */ public static Session getSession()throws HibernateException{ Session session = (Session)threadLocal.get(); if(session==null||!session.isOpen()){ if(sessionFactory==null){ rebuildSessionFactory(); } session = (sessionFactory!=null)?sessionFactory.openSession():null; threadLocal.set(session); } return session; } /* * 重建工厂 * */ public static void rebuildSessionFactory(){ try{ StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() .configure() .build(); Metadata metadata = new MetadataSources(serviceRegistry) .getMetadataBuilder() .applyImplicitNamingStrategy(ImplicitNamingStrategyComponentPathImpl.INSTANCE) .build(); sessionFactory = metadata .getSessionFactoryBuilder() .build(); }catch (Exception e){ System.err.println("创建会话工厂失败！"); e.printStackTrace(); } } /* * 获取SessionFactory对象 * @return SessionFactory * */ public static SessionFactory getSessionFactory(){ return sessionFactory; } /* * 关闭session * * @throws HibernateException * */ public static void closeSession()throws HibernateException{ Session session = (Session)threadLocal.get(); threadLocal.set(null); if(session!=null){ session.close(); } }}4》src/me/hibernate/Customer.java
package me.hibernate;/** * Created by kekekekekeshi on 17-7-13. */public class Customer { private Integer id; private String username; private String password; private boolean sex; private Integer age; private String description; public void setSex(boolean sex) { this.sex = sex; } public void setDescription(String description) { this.description = description; } public void setAge(Integer age) { this.age = age; } public void setPassword(String password) { this.password = password; } public void setUsername(String username) { this.username = username; } public void setId(Integer id) { this.id = id; } public String getDescription() { return description; } public Integer getAge() { return age; } public String getPassword() { return password; } public String getUsername() { return username; } public Integer getId() { return id; } public boolean getSex(){ return sex; }}5》src/me/hibernate/Customer.hbm.xml
<?xml version="1.0" encoding="UTF-8" ?><hibernate-mapping xmlns="http://www.hibernate.org/xsd/hibernate-mapping"> <class name="me.hibernate.Customer" table="tb_customer"> <id name="id"> <generator class="native"/> </id> <property name="username" length="50" not-null="true"/> <property name="password" length="50" not-null="true"/> <property name="age"/> <property name="sex"/> <property name="description"/> </class></hibernate-mapping>6》src/hibernate.cfg.xmll
<?xml version="1.0" encoding="UTF-8" ?><hibernate-configuration> <session-factory> <property name="hibernate.hbm2ddl.auto">create</property> <mapping resource="me/hibernate/Customer.hbm.xml"/> </session-factory></hibernate-configuration>7》src/me/hibernate/dialect/MySQLDialect.java
package me.hibernate.dialect;/** * Created by kekekekekeshi on 17-7-13. */public class MySQLDialect extends org.hibernate.dialect.MySQLDialect { @Override public String getTableTypeString() { return "ENGINE=MyISAM"; }}之所以去重写Dialect是因为jar包可能老了点，而数据库新了，造成了新数据库建表时需要ENGINE而hibernate却给出了个TYPE，会造成建表不成功。
8》src/hibernate.properties
#指定数据库使用的驱动类hibernate.connection.driver_class = com.mysql.jdbc.Driver#指定数据库连接串hibernate.connection.url = jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=true#指定数据库连接的用户名hibernate.connection.username = root#指定数据库连接的密码hibernate.connection.password = SQL_KEY#指定数据库使用的方言hibernate.dialect = me.hibernate.dialect.MySQLDialect#指定是否打印SQL语句hibernate.show_sql=true9》src/me/servlet/CustomerServlet.java
package me.servlet;import me.hibernate.Customer;import me.hibernate.util.*;import org.hibernate.Hibernate;import org.hibernate.Session;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/** * Created by kekekekekeshi on 17-7-13. */@WebServlet(name = "CustomerServlet")public class CustomerServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html"); String username = request.getParameter("username"); String password = request.getParameter("password"); String sex = request.getParameter("sex"); String age = request.getParameter("age"); String description = request.getParameter("description"); System.out.println(username+','+password+','+sex+','+age+','+description+'.'); if(username!=null&&password!=null){ Customer customer = new Customer(); customer.setUsername(username); customer.setPassword(password); if(sex!=null){ customer.setSex(sex.equals('1')?true:false); } customer.setAge(Integer.parseInt(age)); customer.setDescription(description); saveCustomer(customer); request.setAttribute("info","恭喜，注册成功！"); } request.getRequestDispatcher("result.jsp").forward(request,response); } private void saveCustomer(Customer customer) { Session session = null; try{ session = HibernateUtil.getSession(); session.beginTransaction(); session.save(customer); session.getTransaction().commit(); }catch (Exception e){ e.printStackTrace(); session.getTransaction().rollback(); }finally { HibernateUtil.closeSession(); } } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { }}10》配置web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <welcome-file-list> <welcome-file>/index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>CustomerServlet</servlet-name> <servlet-class>me.servlet.CustomerServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>CustomerServlet</servlet-name> <url-pattern>/CustomerServlet</url-pattern> </servlet-mapping></web-app>三：看看运行结果：
1.
2.
3.
ok！成功了！
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