Spring和Hibernate整合操作

Spring提供了對Hibernate整合支持，支持包spring-orm.jar，提供的主要組件如下：

 1.LocalSessionFactoryBean 

      在Spring容器中創建一個SessionFactory對象。

 2.HibernateTemplate

     類似於JdbcTemplate，封裝了session使用過程。

 3.OpenSessionInViesFilter

     提供了對Hibernate延遲加載的支持。

 4.HibernateTransactionManager

    例如DataSourceTransationManager，用於事務控制。

整合過程

1.引入struts，spring，hibernate開發包

2.添加struts.xml、hibernate.cfg.xml、applicationContext,xml

3.編寫實體類Subject.java

4.追加Subject映射描述信息

@Entity
@Table(name="SUBJECT")
public class Subject implements Serializable{

	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	@Column(name="ID")
	private Integer id;
	
	@Column(name="NAME")
	private String name;
	
	@Column(name="DIRECTION_ID")
	private Integer directionId;
。。。省略getset方法
}

5.在hibernate.cfg.xml追加<mapping class=""/>

	<session-factory>
		<property name="dialect">
			org.hibernate.dialect.MySQLDialect
		</property>
		<!-- 
		<property name="connection.url">
			jdbc:mysql://localhost:3306/ovls?useUnicode=true&amp;characterEncoding=utf8
		</property>
		<property name="connection.username">root</property>
		<property name="connection.password">1234</property>
		<property name="connection.driver_class">
			com.mysql.jdbc.Driver
		</property>
		 -->
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		
		<!-- 加載映射描述信息 -->
		<mapping class="cn.xdl.entity.Subject"/>

	</session-factory>

6.在applicationContext.xml中配置DataSource、SessionFactory和HibernaterTemplate對象（在spring配置文件配置自己的DataSource後hibernate.cfg.xml文件的配置可以註釋掉。）

 <bean id="dbcp" class="org.apache.commons.dbcp.BasicDataSource">
	<property name="username" value="root"></property>
	<property name="password" value="123456"></property>
	<property name="url" value="jdbc:mysql://localhost:3306/ovls?useUnicode=true&amp;characterEncoding=utf8"></property>
	<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
</bean>
	
<bean id="sessionFactory" 
	class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
	<property name="dataSource" ref="dbcp"></property>
	<property name="configLocations" value="classpath:hibernate.cfg.xml"></property>
</bean>
	
<bean id="template" class="org.springframework.orm.hibernate5.HibernateTemplate">
		<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<!-- Hibernate事務控制 --> 在**Action.java加上@Transactional使用
	<bean id="txManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	
	<tx:annotation-driven transaction-manager="txManager"/>

測試一下template對象的創建情況

mport org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.orm.hibernate5.HibernateTemplate;

import cn.xdl.entity.Subject;

public class TestHibernateTemplate {

	public static void main(String[] args) {
		String conf = "applicationContext.xml";
		ApplicationContext ac = 
			new ClassPathXmlApplicationContext(conf);
		HibernateTemplate template = 
			ac.getBean("template",HibernateTemplate.class);
		Subject subject = template.get(Subject.class, 1);
		System.out.println(subject.getId()+" "+subject.getName());
		
	}

}

7.編寫SubjectDao接口，並用HibernateSubjectDao實現。在applicationcontext.xml中開啓組件掃描。

import cn.xdl.entity.Subject;

public interface SubjectDao {
	
	public List<Subject> loadAll();
	
	public List<Subject> loadByDirection(int directionId);
	
	public Subject loadById(int id);
	
}

@Repository
public class HibernateSubjectDao implements SubjectDao{

	@Autowired
	private HibernateTemplate template;
	

	public List<Subject> loadAll() {
		List list = template.find("from Subject");
		return list;
	}


	public List<Subject> loadByDirection(int directionId) {
		String hql = "from Subject where directionId=?";
		Object[] params = {directionId};
		List list = template.find(hql,params);
		return list;
	}


	@Override
	public Subject loadById(int id) {
		Subject subject = template.load(Subject.class, id);
		return subject;
	}

}

<!--applicationContext.xml文件開啓掃描 掃描dao,service,action -->
	<context:component-scan base-package="cn.xdl"/>

測試Dao接口中的方法

public class TestHibernateTemplate {

	public static void main(String[] args) {
		String conf = "applicationContext.xml";
		ApplicationContext ac = 
			new ClassPathXmlApplicationContext(conf);

		SubjectDao subjectDao = 
			ac.getBean("hibernateSubjectDao",SubjectDao.class);
//		List<Subject> list = subjectDao.loadAll();
		List<Subject> list = subjectDao.loadByDirection(1);
		for(Subject subject:list){
			System.out.println(subject.getId()+" "+subject.getName());
		}
	}

}

8.開發struts2流程

       /subject/list.do -->Filter-->SubjecAction-->SubjectDao-->Result-->返回學科集合的JSON結果

9.在web.xml配置Filter

<filter> //解決延遲報錯問題
  	<filter-name>opensession</filter-name>
  	<filter-class>
  	org.springframework.orm.hibernate5.support.OpenSessionInViewFilter
  	</filter-class>
  </filter>
  
  <filter-mapping>
  	<filter-name>opensession</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <filter>
  	<filter-name>strutsmvc</filter-name>
  	<filter-class>
  	org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter
  	</filter-class>
  	<!-- 默認找src/struts.xml配置文件 -->
  </filter>
  
  <filter-mapping>
  	<filter-name>strutsmvc</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
  

10.編寫SubjectAction

import cn.xdl.dao.SubjectDao;
import cn.xdl.entity.Subject;

@Controller
@Namespace("/subject")
@ParentPackage("json-default")
@Transactional
public class SubjectAction {
	
	private List<Subject> subjects;//傳出值
	
	private int id;//接收請求參數
	private Subject subject;//傳出值

	@Autowired
	private SubjectDao subjectDao;
	
	@Action(value="list",results={
		@Result(name="success",type="json",params={"root","subjects"})
	})
	public String list(){
		subjects = subjectDao.loadAll();
		return "success";
	}
	
	@Action(value="load",results={
		@Result(name="success",type="json",params={"root","subject"})
	})
	public String load(){
		subject = subjectDao.loadById(id);
		return "success";
	}
	
。。。。省略getset方法

}

11.在struts.xml配置SubjectAction，註解的形式上面已經配置。

12.在struts.xml配置Result（註解形式已經配置），註解的形式上面已經配置，此處配多種請求方式

<constant name="struts.action.extension" value="do"/> //請求方式

13.在web.xml配置ContextLoaderListener實例化Spring容器

<!-- 創建Spring容器對象，給struts-spring-plugin.jar訪問 -->
  <context-param>
  	<param-name>contextConfigLocation</param-name>
  	<param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  
  <listener>
  	<listener-class>
  	org.springframework.web.context.ContextLoaderListener
  	</listener-class>
  </listener>

部署到Tomcat啓動，運行測試。