这些天我经历了hibernate然后我正在尝试开发一个应用程序来集成struts2 + Hibernate + Spring ..我有两种初始化hibernate会话工厂的方法..当我们为struts2加载过滤器调度程序时那个时候我们应该加载hibernate sessionfactory，例如如下所示..
... Web.xml中
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<filter>
<filter-name>controller</filter-name>
<filter-class>mypack.Struts2Dispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>controller</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping></web-app>
Struts2Dispatcher文件..
import javax.servlet.*;
import org.apache.struts2.dispatcher.FilterDispatcher;
import org.hibernate.HibernateException;
public class Struts2Dispatcher extends FilterDispatcher
{
@Override
public void init(FilterConfig filterConfig) throws ServletException
{
super.init(filterConfig);
try
{
HibernateUtil.createSessionFactory();
System.out.print("-------application initializing successfully-----");
}
catch (HibernateException e)
{
throw new ServletException(e);
}
}
}
和hibernate util ..
package mypack;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.Session;
public class HibernateUtil
{
private static SessionFactory sessionFactory;
public static void createSessionFactory()
{
sessionFactory = new Configuration().configure().buildSessionFactory();
}
public static Session getSession()
{
return sessionFactory.openSession();
}
}
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="connection.username">system</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
<property name="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="connection.password">manager</property>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="show_sql">true</property>
<mapping resource="Employee.hbm.xml"/>
</session-factory>
</hibernate-configuration>
映射文件..
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="mypack.Employee">
<id name="eid" column="emp_id" type="int">
<generator class="increment"/></id>
<property name="name" column="emp_name"/>
<property name="job"/>
<property name="salary" type="int"/>
</class>
</hibernate-mapping>
应用程序context.xml文件
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
<bean id="MyIOCObject" class="mypack.LoginAction"/>
</beans>
struts.xml文件..
<struts>
<package name="pack" extends="struts-default">
<action name="login" class="MyIOCObject" method="insert">
<result name="success">/welcome.jsp</result>
<result name="failure">/relogin.jsp</result>
</action>
</package>
</struts>
登录Action java类
package mypack;
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
public class LoginAction
{
private String name,job;
private int salary;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String insert()
{
try
{
Session ses=HibernateUtil.getSession();
Employee emp=new Employee(name,job,salary);
Transaction tx=ses.beginTransaction();
ses.save(emp);
tx.commit();
ses.close();
return "success";
}catch(Exception e)
{
System.out.println(e);
return "failure";
}
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public int getSalary() {
return salary;
}
public void setSalary(int salary) {
this.salary = salary;
}
}
主要员工pojo
package mypack;
public class Employee
{
private int eid,salary;
private String name,job;
public Employee()
{
super();
}
public Employee(String name, String job,int salary)
{
super();
this.salary = salary;
this.name = name;
this.job = job;
}
public int getEid() {
return eid;
}
public void setEid(int eid) {
this.eid = eid;
}
public int getSalary() {
return salary;
}
public void setSalary(int salary) {
this.salary = salary;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
}
主要的测试程序..
package mypack;
import java.util.Scanner;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;
public class TestProgram
{
public static void main(String[] args)
{
try
{
Configuration cfg=new Configuration();
cfg.configure();
SessionFactory sesfac=cfg.buildSessionFactory();
Session ses=sesfac.openSession();
System.out.println("Session created , fetching objects...");
Scanner in=new Scanner(System.in);
System.out.println("Enter Employee id :- ");
int id=in.nextInt();
Employee e=(Employee)ses.load(Employee.class,id);
System.out.println("Following Object is fetched");
System.out.println(e.getEid()+"\t"+e.getName()+"\t"+e.getSalary()+"\t"+e.getJob());
ses.close();
}catch (Exception e)
{
System.out.println(e);
}
}
}
我正在讨论的另一种方法是在链接another approach to integagrate 现在请告诉我哪种方法最好，还有其他方法比这两种方法更好吗？
请发布更新的代码，以便我能掌握这个概念，请指教.. !!
答案 0 :(得分：1)
这对我有用（使用Struts2，JPA / Hibernate和Guice）：
EntityManagerFactory中创建并销毁SessionFactory或ServletContextListener;不要继承Struts2过滤器来执行此操作（另外，请考虑使用较新的StrutsPrepareAndExecuteFilter而不是较旧的，已弃用的FilterDispatcher）EntityManager或Session，以便每个请求都有自己的工作单元;这是一种最佳实践，因为这些工作单元不是线程安全的，不应跨请求共享最后，在尝试将它们全部打开之前，您可能希望先了解一下Struts2，Hibernate和Spring。