怎样利用Hibernate开发Blog实例分析
开发工具采用MYECLIPS3.6，首先是建立项目，导入STRUTS+HIBERNATE包，然后配置SRC跟目录下的Hibernate.cfg.xml.我采用的是MYSQL数据库，所以配置如下：
<!-- properties -->
root
jdbc:mysql://localhost:3306/tonnyblog
net.sf.hibernate.dialect.MySQLDialect
org.gjt.mm.mysql.Driver
<!-- mapping files -->
mapping为JAVABEAN所对应的映射。
下面我们继续HIBERNATE程序的下步编写：
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;
/** * Description of the Class * *
@author tonny * @created
2004年2月6日
*/public class HibernateUtil
{
private final static SessionFactory sessionFactory;
static
{
try
{
sessionFactory =
new Configuration().configure().buildSessionFactory();
}
catch (HibernateException ex)
{
throw new RuntimeException(
"Exception building SessionFactory:
" + ex.getMessage(),ex);
}
}
private HibernateUtil(){ }
/** * Description of the Field
*/
private final static ThreadLocal
session = new ThreadLocal();
/** * Description of the Method
* * @return
Description of the Return Value *
@exception HibernateException
Description of the Exception */
public static Session currentSession()
throws HibernateException
{
Session s = (Session) session.get();
if (s == null)
{
s = sessionFactory.openSession();
session.set(s);
} return s;
}
/** * Description of the Method
* * @exception HibernateException
Description of the Exception */
public static void closeSession()
throws HibernateException {
Session s = (Session) session.get();
session.set(null);
if (s != null)
{
s.close();
}
}
public static void init()
{
}
}
创建sessionFactory
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.PlugIn;
import org.apache.struts.config.ModuleConfig;
import com.tonny.blog.dao.hibernate.HibernateUtil;
public class HibernatePlugin
implements org.apache.struts.action.PlugIn
{
public void init(ActionServlet servlet,
ModuleConfig config)
{
HibernateUtil.init();
}
public void destroy()
{
try
{
HibernateUtil.closeSession();
}
catch(HibernateException hex)
{
hex.printStackTrace();
}
}
}
以上为HIBERNATE基本配置，对数据库操作采用DAO模式，增加配置如下：
import com.tonny.blog.dao.hibernate.*;
public class DAOFactory
{
private static DAOFactory instance;
public synchronized static DAOFactory getInstance()
{
if
(instance == null)
{
instance = new DAOFactory();
}
return instance;
}
private DAOFactory()
{
}
public ItemDAO getItemDAO()
{
return new ItemDAOHibernate();
}
public ReviewDAO getReviewDAO()
{
return new ReviewDAOHibernate();
}
public UserDAO getUserDAO()
{
return new UserDAOHibernate();
}
}
struts.xml增加配置：
debug="3" locale="true"
nocache="true"
processorClass=
"com.tonny.blog.struts.controller.IndexRequestProcessor"/>
"com.tonny.blog.struts.plugin.HibernatePlugin"/>
value="0"/>
value="false"/>
value="/WEB-INF/title-def.xml"/>
下面我们定义服务层：
public class ServiceFactory
{
private static ServiceFactory instance;
public synchronized static ServiceFactory getInstance()
{
if (instance == null)
{
instance = new ServiceFactory();
}
return instance;
}
private ServiceFactory()
{
}
public
IService getService()
{
return new ServiceImp();
}
}
import com.tonny.blog.struts.form.*;
import com.tonny.blog.view.*;
import com.tonny.blog.bean.*;
import java.util.*;
import javax.servlet.http.*;
public interface IService
{
public UserContainer login(UserForm userForm);
public boolean logout(UserContainer userContainer);
public boolean addBlog(BlogForm blogForm,String filePath);
public boolean removeBlog(Long id);
public boolean addReview(Long topicId,ReviewForm reviewForm);
public boolean updateBlog(Long id,String conten,String topic);
public boolean removeReview(Long id);
public List getItems();
public ItemView getItem(Long id);
public ItemView getEditItem(Long id);
public List search(SearchForm searchForm);
/** * @param id * @param userForm */
public boolean addUser(UserForm userForm);
}
import com.tonny.blog.struts.form.*;
import com.tonny.blog.view.*;
import com.tonny.blog.dao.*;
import com.tonny.blog.bean.*;
import java.util.*;import javax.servlet.http.*;
import com.tonny.blog.struts.util.FileUpload;
public class ServiceImp implements IService
{
public UserContainer login(UserForm userForm)
{
UserDAO userDAO=DAOFactory.getInstance().getUserDAO();
User user=userDAO.loadUser(userForm.getName());
if(user==null)return new UserContainer("",false);
if(!user.getPassword().equals(userForm.getPassword()))
return new UserContainer("",false);
return new UserContainer(userForm.getName(),true);
}
public boolean logout(UserContainer userContainer)
{
userContainer.setLogin(false);
userContainer.setName("");
return true;
}
public boolean addBlog(BlogForm blogForm,String path)
{
ItemDAO itemDAO=DAOFactory.getInstance().getItemDAO();
Item item=new Item(blogForm.getTopic(),
blogForm.getContent(),
FileUpload.upload(blogForm.getFile(),path),new Date());
itemDAO.addItem(item);
return true;
}
public boolean removeBlog(Long id)
{
ReviewDAO reviewDAO=DAOFactory.getInstance(
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