Java 集成Struts 2和hibernate的最佳方法
我打算集成hibernate和struts2。请告诉我哪种方法是最好的,我认为在Struts2中,没有官方插件来集成Hibernate框架。但是,您可以通过以下步骤解决问题:Java 集成Struts 2和hibernate的最佳方法,java,spring,hibernate,struts2,Java,Spring,Hibernate,Struts2,我打算集成hibernate和struts2。请告诉我哪种方法是最好的,我认为在Struts2中,没有官方插件来集成Hibernate框架。但是,您可以通过以下步骤解决问题: 注册自定义ServletContextListener 在ServletContextListener类中,初始化Hibernate会话并将其存储到servlet上下文中 在action类中,从servlet上下文获取Hibernate会话,并正常执行Hibernate任务 请告知我初始化hibernate会话功能的ser
package com.mkyong.customer.model;
import java.util.Date;
public class Customer implements java.io.Serializable {
private Long customerId;
private String name;
private String address;
private Date createdDate;
//getter and setter methods
}
hbm映射文件
<hibernate-mapping>
<class name="com.mkyong.customer.model.Customer"
table="customer" catalog="mkyong">
<id name="customerId" type="java.lang.Long">
<column name="CUSTOMER_ID" />
<generator class="identity" />
</id>
<property name="name" type="string">
<column name="NAME" length="45" not-null="true" />
</property>
<property name="address" type="string">
<column name="ADDRESS" not-null="true" />
</property>
<property name="createdDate" type="timestamp">
<column name="CREATED_DATE" length="19" not-null="true" />
</property>
</class>
</hibernate-mapping>
最后是动作课
ackage com.mkyong.customer.action;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.struts2.ServletActionContext;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import com.mkyong.customer.model.Customer;
import com.mkyong.listener.HibernateListener;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class CustomerAction extends ActionSupport
implements ModelDriven{
Customer customer = new Customer();
List<Customer> customerList = new ArrayList<Customer>();
public String execute() throws Exception {
return SUCCESS;
}
public Object getModel() {
return customer;
}
public List<Customer> getCustomerList() {
return customerList;
}
public void setCustomerList(List<Customer> customerList) {
this.customerList = customerList;
}
//save customer
public String addCustomer() throws Exception{
//get hibernate session from the servlet context
SessionFactory sessionFactory =
(SessionFactory) ServletActionContext.getServletContext()
.getAttribute(HibernateListener.KEY_NAME);
Session session = sessionFactory.openSession();
//save it
customer.setCreatedDate(new Date());
session.beginTransaction();
session.save(customer);
session.getTransaction().commit();
//reload the customer list
customerList = null;
customerList = session.createQuery("from Customer").list();
return SUCCESS;
}
//list all customers
public String listCustomer() throws Exception{
//get hibernate session from the servlet context
SessionFactory sessionFactory =
(SessionFactory) ServletActionContext.getServletContext()
.getAttribute(HibernateListener.KEY_NAME);
Session session = sessionFactory.openSession();
customerList = session.createQuery("from Customer").list();
return SUCCESS;
}
}
ackage com.mkyong.customer.action;
导入java.util.ArrayList;
导入java.util.Date;
导入java.util.List;
导入org.apache.struts2.ServletActionContext;
导入org.hibernate.Session;
导入org.hibernate.SessionFactory;
导入com.mkyong.customer.model.customer;
导入com.mkyong.listener.HibernateListener;
导入com.opensymphony.xwork2.ActionSupport;
导入com.opensymphony.xwork2.ModelDriven;
公共类CustomerAction扩展了ActionSupport
实现模型驱动{
客户=新客户();
List customerList=new ArrayList();
公共字符串execute()引发异常{
回归成功;
}
公共对象getModel(){
退货客户;
}
公共列表getCustomerList(){
返回客户列表;
}
public void setCustomerList(列表customerList){
this.customerList=customerList;
}
//拯救客户
公共字符串addCustomer()引发异常{
//从servlet上下文获取hibernate会话
SessionFactory SessionFactory=
(SessionFactory)ServletActionContext.getServletContext()
.getAttribute(HibernateListener.KEY\u名称);
Session Session=sessionFactory.openSession();
//省省吧
customer.setCreatedDate(新日期());
session.beginTransaction();
session.save(客户);
session.getTransaction().commit();
//重新加载客户列表
customerList=null;
customerList=session.createQuery(“来自客户”).list();
回归成功;
}
//列出所有客户
公共字符串listCustomer()引发异常{
//从servlet上下文获取hibernate会话
SessionFactory SessionFactory=
(SessionFactory)ServletActionContext.getServletContext()
.getAttribute(HibernateListener.KEY\u名称);
Session Session=sessionFactory.openSession();
customerList=session.createQuery(“来自客户”).list();
回归成功;
}
}
伙计们,请发布更新后的代码,非常感谢,我在这方面感到骄傲 我对阅读这个标题感到困惑,因为它提到了Spring和Hibernate,但读完之后,我发现它是Struts2和Hibernate。以下是我对您的输入的快速思考 Struts2作为MVC框架用于web层,而Hibernate负责处理DB交互,尽管您始终可以使用这两种方法,并且可以在Struts2操作中注入Hibernate会话,但我不建议您使用这种方法。 我的建议是创建一个服务层,负责Struts2操作类和Hibernate层之间的交互,这将帮助您微调代码,并使您将来更容易进行任何代码更改或修改 Struts2中已经有一个插件,允许您在action类中注入Hibernate会话 但我仍然认为,不要将hibernate会话与Struts2操作混合使用,最好在两者之间放置一个服务层来实现这一点
另外,由于您已经用Spring标记了您的问题,所以我相信您也在应用程序中使用Spring,因此最好让Spring处理您与Hibernate的交互,此外,引入服务层将有助于高效地进行事务划分,并尽可能地进行微调。您不想在
ServletContext
中放置Hibernate会话。会话不是线程安全的,Hibernate的最佳实践是为每个请求创建并销毁会话
(或者EntityManager
,如果您使用JPA)
这可以使用拦截器来完成。正如Umesh所指出的,您应该倾向于使用服务层类(如DAO)直接与会话交互,而不是从action类中使用它。这为您提供了模型层和控制器层之间更明确的分离。请仅发布代码和配置的相关部分。这太多了…完整的例子在url上,请仔细阅读并根据您的设计转换它,即添加服务层,以便我能够完全理解它,谢谢您使用Struts 2的servlet过滤器?如果是这样,过滤器是拦截器的替代品。最大的区别(AIUI)是拦截器将围绕操作包装会话,而过滤器将围绕整个请求包装会话,包括呈现阶段。如果您的模型只包含DTO,而不包含实体,那么您只需要操作中的会话,但是如果您希望您的模型包含实体,如果您想避免可怕的LazyInitializationException
@Steven.,您将需要整个请求过程中的会话。完整的示例位于url mkyong.com/struts2/struts-2-hibernate-integration-example,请仔细阅读,并根据添加服务层的设计进行转换,以便我能理解它完全,Thanks@TomAnderson:拦截器会将其环绕在渲染器上
package com.mkyong.listener;
import java.net.URL;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateListener implements ServletContextListener{
private Configuration config;
private SessionFactory factory;
private String path = "/hibernate.cfg.xml";
private static Class clazz = HibernateListener.class;
public static final String KEY_NAME = clazz.getName();
public void contextDestroyed(ServletContextEvent event) {
//
}
public void contextInitialized(ServletContextEvent event) {
try {
URL url = HibernateListener.class.getResource(path);
config = new Configuration().configure(url);
factory = config.buildSessionFactory();
//save the Hibernate session factory into serlvet context
event.getServletContext().setAttribute(KEY_NAME, factory);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
ackage com.mkyong.customer.action;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.struts2.ServletActionContext;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import com.mkyong.customer.model.Customer;
import com.mkyong.listener.HibernateListener;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class CustomerAction extends ActionSupport
implements ModelDriven{
Customer customer = new Customer();
List<Customer> customerList = new ArrayList<Customer>();
public String execute() throws Exception {
return SUCCESS;
}
public Object getModel() {
return customer;
}
public List<Customer> getCustomerList() {
return customerList;
}
public void setCustomerList(List<Customer> customerList) {
this.customerList = customerList;
}
//save customer
public String addCustomer() throws Exception{
//get hibernate session from the servlet context
SessionFactory sessionFactory =
(SessionFactory) ServletActionContext.getServletContext()
.getAttribute(HibernateListener.KEY_NAME);
Session session = sessionFactory.openSession();
//save it
customer.setCreatedDate(new Date());
session.beginTransaction();
session.save(customer);
session.getTransaction().commit();
//reload the customer list
customerList = null;
customerList = session.createQuery("from Customer").list();
return SUCCESS;
}
//list all customers
public String listCustomer() throws Exception{
//get hibernate session from the servlet context
SessionFactory sessionFactory =
(SessionFactory) ServletActionContext.getServletContext()
.getAttribute(HibernateListener.KEY_NAME);
Session session = sessionFactory.openSession();
customerList = session.createQuery("from Customer").list();
return SUCCESS;
}
}