在 Struts2 中，沒有官方的插件集成Hibernate框架。但是，可以通過以下步驟解決方法：

1. 註冊一個自定義的 ServletContextListener
2. 在 ServletContextListener 類, 初始化Hibernate會話，並將其存儲到servlet上下文。
3. 在動作類, 可以通過servlet上下文的Hibernate會話，並執行任務正常的Hibernate操作。

請參閱它們的關係：

Struts 2 <-- (Servlet Context) ---> Hibernate <-----> Database  

在本教程中，在Struts中2開發我們顯示了一個簡單的客戶模塊(添加和列表功能)，並使用 Hibernate 進行數據庫操作。使用上述部分機制集成(存儲和檢索在servlet上下文Hibernate的Session)。

1. 工程目錄結構

來看看這個完整的項目文件夾結構。

2. MySQL表結構腳本

創建一個客戶(customer)表。下面是SQL表腳本。

CREATE TABLE `customer` (
`customer_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(45) NOT NULL,
`address` varchar(255) NOT NULL,
`create_date` datetime NOT NULL,
PRIMARY KEY (`customer_id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

4. Hibernate 相關配置

Hibernate的模型和配置的東西。

Customer.java – 創建客戶表對應的一個類。

package com.yiibai.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

}

Customer.hbm.xml – Hibernate映射文件客戶表。

    <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.cfg.xml – Hibernate數據庫配置文件

5. Hibernate ServletContextListener

創建一個類 ServletContextListener, 並初始化Hibernate會話，並將其存儲到servlet上下文。

HibernateListener .java

package com.yiibai.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());
   }
}

}

在 web.xml 文件中註冊監聽器。

web.xml

6. Action

在動作類, 可以通過servlet上下文的Hibernate會話和執行正常的Hibernate任務。

CustomerAction.java

package com.yiibai.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.yiibai.customer.model.Customer;
import com.yiibai.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;

}    

}

7. JSP 頁面

JSP頁面用來添加和列出的客戶。

customer.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>

Struts 2 + Hibernate integration example

Add Customer

All Customers

<s:if test="customerList.size() > 0">

8. struts.xml

<action name="addCustomerAction" 
class="com.yiibai.customer.action.CustomerAction" method="addCustomer" >
   <result name="success">pages/customer.jsp</result>
</action>

<action name="listCustomerAction" 
class="com.yiibai.customer.action.CustomerAction" method="listCustomer" >
    <result name="success">pages/customer.jsp</result>
</action>        

9. 實例測試執行

訪問客戶模塊：http://localhost:8080/struts2hibernate/listCustomerAction.action

在名稱和地址字段填寫，點擊提交按鈕，插入的客戶的詳細信息會馬上列出結果。

參考

1. Struts2 + Hibernate使用「Full Hibernate Plugin"集成
2. ServletContextListener 文檔
3. Struts + Hibernate集成實例

代碼下載 - http://pan.baidu.com/s/1hqhQJ7A