Spring+Hibernate泛型DAO的自动注入（例子）

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总体架构：

1.定义泛型DAO接口:

package com.integration.framework.dao;

import java.io.Serializable;
import java.util.List;

/**
 * @ClassName：IBaseGenericDAO
 * @Description：TODO(IBaseGenericDAO DAO层泛型接口，定义基本的DAO功能 )
 * @param <T>    实体类 
 * @param <PK>    主键类，必须实现Serializable接口	
 * @author zj
 * @date：Jul 9, 2012 1:32:07 PM
 * @version V1.0 
 */
public abstract interface IBaseGenericDAO<T, PK extends Serializable> {

	/**
	 * 按主键取记录 
	 * @param id 主键值   
	 * @return 记录实体对象，如果没有符合主键条件的记录，则返回null
	 */
	public abstract T get(PK id);

	/**
	 * 按主键取记录
	 * @param id 主键值
	 * @return 记录实体对象，如果没有符合主键条件的记录，则 throw DataAccessException   
	 */
	public abstract T load(PK id);

	/**
	 * 获取全部实体
	 * @return 返回一个list集合数据
	 */
	public abstract List<T> loadAll();

	/**
	 * 修改一个实体对象（UPDATE一条记录）
	 * @param entity 实体对象
	 */
	public abstract void update(T entity);

	/**
	 * 插入一个实体（在数据库INSERT一条记录）
	 * @param entity 实体对象   
	 */
	public abstract void save(T entity);

	/**
	 * 增加或更新实体
	 * @param entity 实体对象
	 */
	public abstract void saveOrUpdate(T entity);

	/**
	 * 删除指定的实体
	 * @param entity 实体对象
	 */
	public abstract void delete(T entity);

}

2.实现IBaseGenericDAO接口的Hibernate的实现类HibernateBaseGenericDAOImpl:

package com.integration.framework.dao.impl;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import org.springframework.stereotype.Repository;

import com.integration.framework.dao.IBaseGenericDAO;

/**
 * @ClassName：HibernateBaseGenericDAOImpl
 * @Description：TODO(HibernateBaseGenericDAOImpl DAO层泛型基类，实现了基本的DAO功能 利用了Spring的HibernateDaoSupport功能)
 * @param <T> 实体类 
 * @param <PK> 主键类，必须实现Serializable接口	
 * @author zj
 * @date：Jul 9, 2012 1:41:37 PM
 * @version V1.0
 */
@SuppressWarnings("all")
public class HibernateBaseGenericDAOImpl<T, PK extends Serializable> extends HibernateDaoSupport implements IBaseGenericDAO<T, PK>{

	private static Log logger = LogFactory.getLog(HibernateBaseGenericDAOImpl.class);
	
	private Class<T> entityClass;

	/**
	 * 构造方法，根据实例类自动获取实体类类型
	 */
	public HibernateBaseGenericDAOImpl() {
		this.entityClass = null;
        Class c = getClass();
        Type t = c.getGenericSuperclass();
        if (t instanceof ParameterizedType) {
            Type[] p = ((ParameterizedType) t).getActualTypeArguments();
            this.entityClass = (Class<T>) p[0];
        }
	}

	/*
	 * (non-Javadoc)
	 * @see com.integration.framework.dao.IBaseGenericDAO#delete(java.lang.Object)
	 */
	public void delete(T entity) {
		try{
			getHibernateTemplate().delete(entity);
		}catch(DataAccessException e){
			logger.error(e.getMessage(), e);
		}
	}

	/*
	 * (non-Javadoc)
	 * @see com.integration.framework.dao.IBaseGenericDAO#get(java.io.Serializable)
	 */
	public T get(PK id) {
		return (T) getHibernateTemplate().get(entityClass, id);
	}

	/*
	 * (non-Javadoc)
	 * @see com.integration.framework.dao.IBaseGenericDAO#load(java.io.Serializable)
	 */
	public T load(PK id) {
		return (T) getHibernateTemplate().load(entityClass, id);
	}

	/*
	 * (non-Javadoc)
	 * @see com.integration.framework.dao.IBaseGenericDAO#loadAll()
	 */
	public List<T> loadAll() {
		return getHibernateTemplate().loadAll(entityClass);
	}

	/*
	 * (non-Javadoc)
	 * @see com.integration.framework.dao.IBaseGenericDAO#save(java.lang.Object)
	 */
	public void save(T entity) {
		try{
			getHibernateTemplate().save(entity);
		}catch(DataAccessException e){
			logger.error(e.getMessage(), e);
		}
	}

	/*
	 * (non-Javadoc)
	 * @see com.integration.framework.dao.IBaseGenericDAO#saveOrUpdate(java.lang.Object)
	 */
	public void saveOrUpdate(T entity) {
		try{
			getHibernateTemplate().saveOrUpdate(entity);
		}catch(DataAccessException e){
			logger.error(e.getMessage(), e);
		}
	}

	/*
	 * (non-Javadoc)
	 * @see com.integration.framework.dao.IBaseGenericDAO#update(java.lang.Object)
	 */
	public void update(T entity) {
		try{
			getHibernateTemplate().update(entity);
		}catch(DataAccessException e){
			logger.error(e.getMessage(), e);
		}		
	}
}

3.定义Service泛型接口:

 package com.integration.framework.service;

import java.io.Serializable;
import java.util.List;

/**
 * @ClassName：IBaseGenericService
 * @Description：TODO(IBaseGenericService Service层泛型接口，定义基本的Service功能)
 * @param <T>    实体类 
 * @param <PK>    主键类，必须实现Serializable接口		
 * @author zhoujing
 * @date：Jul 9, 2012 2:48:56 PM
 * @version V1.0
 */
public interface IBaseGenericService<T, PK extends Serializable> {

	/**
	 * 按主键取记录 
	 * @param id 主键值   
	 * @return 记录实体对象，如果没有符合主键条件的记录，则返回null
	 */
	public abstract T get(PK id);

	/**
	 * 按主键取记录
	 * @param id 主键值
	 * @return 记录实体对象，如果没有符合主键条件的记录，则 throw DataAccessException   
	 */
	public abstract T load(PK id);

	/**
	 * 获取全部实体
	 * @return 返回一个list集合数据
	 */
	public abstract List<T> loadAll();

	/**
	 * 修改一个实体对象（UPDATE一条记录）
	 * @param entity 实体对象
	 */
	public abstract void update(T entity);

	/**
	 * 插入一个实体（在数据库INSERT一条记录）
	 * @param entity 实体对象   
	 */
	public abstract void save(T entity);

	/**
	 * 增加或更新实体
	 * @param entity 实体对象
	 */
	public abstract void saveOrUpdate(T entity);

	/**
	 * 删除指定的实体
	 * @param entity 实体对象
	 */
	public abstract void delete(T entity);
}

4.实现Service：

package com.integration.framework.service.impl;

import java.io.Serializable;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.integration.framework.dao.IBaseGenericDAO;
import com.integration.framework.service.IBaseGenericService;

/**
 * @ClassName：BaseGenericServiceImpl
 * @Description：TODO(这里用一句话描述这个类的作用)	
 * @author zhoujing
 * @date：Jul 9, 2012 5:16:46 PM
 * @version V1.0
 */
@Service
@SuppressWarnings("all")
public class BaseGenericServiceImpl<T, PK extends Serializable> implements IBaseGenericService<T, PK> {

	@Autowired
	private IBaseGenericDAO dao;
	
	public void delete(T entity) {
		dao.delete(entity);
	}

	public T get(PK id) {
		return (T)dao.get(id);
	}

	public T load(PK id) {
		return (T) dao.load(id);
	}

	public List<T> loadAll() {
		return dao.loadAll();
	}

	public void save(T entity) {
		dao.save(entity);
	}

	public void saveOrUpdate(T entity) {
		dao.saveOrUpdate(entity);
	}

	public void update(T entity) {
		dao.update(entity);
	}

}

5.配置applicationContext:

 <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
    		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
			http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
			http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
			http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"
			default-autowire="byName" default-lazy-init="false">
			
	<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath:/db/jdbc.properties</value>
			</list>
		</property>
	</bean>
	
	<!-- c3p0 数据源 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass" value="${jdbc.driverClassName}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="minPoolSize" value="${c3p0.minPoolSize}"/>
        <property name="maxPoolSize" value="${c3p0.maxPoolSize}"/>
        <property name="initialPoolSize" value="${c3p0.initialPoolSize}"/>
        <property name="maxIdleTime" value="${c3p0.maxIdleTime}"/>
        <property name="acquireIncrement" value="${c3p0.acquireIncrement}"/>
        <property name="testConnectionOnCheckin" value="${c3p0.testConnectionOnCheckin}"/>
        <property name="acquireRetryAttempts" value="${c3p0.acquireRetryAttempts}"/>
        <property name="acquireRetryDelay" value="${c3p0.acquireRetryDelay}"/>
        <property name="breakAfterAcquireFailure" value="${c3p0.breakAfterAcquireFailure}"/>
        <property name="idleConnectionTestPeriod" value="${c3p0.idleConnectionTestPeriod}"/>
        <property name="automaticTestTable" value="${c3p0.automaticTestTable}"/>
	</bean>	
	
	<!-- 配置sessionFactory -->
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">${hibernate.dialect}</prop>
				<prop key="hibernate.show_sql">true</prop>
				<prop key="hibernate.generate_statistics">true</prop>
                <prop key="hibernate.connection.release_mode">auto</prop>
                <prop key="hibernate.autoReconnect">true</prop>
                
                <prop key="query.substitutions">true 1, false 0, yes '1', no '1'</prop>

				<prop key="hibernate.jdbc.fetch_size">50</prop>
				<prop key="hibernate.jdbc.batch_size">25</prop>
				<prop key="hibernate.jdbc.use_scrollable_resultset">true</prop>
				<prop key="hibernate.cache.use_query_cache">true</prop>
				<prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop>
			</props>
		</property>
		<property name="packagesToScan">
			<list>
				<value>com.integration</value>
			</list>
		</property>
	</bean>

	<!-- 事务管理 -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>

	<tx:advice id="txAdvice" transaction-manager="transactionManager" >
		<tx:attributes >
		   	<tx:method name="get*" read-only="true" />
			<tx:method name="load*" read-only="true" />
			<tx:method name="query*" read-only="true" />
			<!-- other methods use the default transaction settings (see below) -->
			<tx:method name="*" rollback-for="Exception" />
		</tx:attributes >
	</tx:advice>
	
	<context:component-scan base-package="com.integration" />
	
	<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
</beans>

6.web.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<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">

	<display-name>Integration</display-name>
	<!-- 指定spring配置文件的位置 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:/context/applicationContext*.xml</param-value>
	</context-param>
	
	<!-- ============log4j begin=========-->
	<!--for Spring-loading-->
	<context-param>
		<param-name>log4jConfigLocation</param-name>
		<param-value>classpath:/log4j.properties</param-value>
	</context-param>
	<listener>
		<listener-class>
			org.springframework.web.util.Log4jConfigListener
		</listener-class>
	</listener>
	<!-- ============log4j end=========-->
	
	<!-- Struts 2 -->
	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>
			org.apache.struts2.dispatcher.FilterDispatcher
		</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<!-- 自动加载applicationContext -->
	<listener>
		<listener-class>
			org.springframework.web.context.ContextLoaderListener
		</listener-class>
	</listener>

	<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
</web-app>