在Spring框架中3种取得DataSource对象的方法

在Spring框架中有如下3种获得DataSource对象的方法：

1、从JNDI获得DataSource

? a)Spring JNDI数据源配置信息

    <bean id="dataSource"
        class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName">
           <value>java:comp/env/jcptDataSourceJNDI</value>
        </property>
    </bean>

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?????? jcptDataSourceJNDI是tomcat或者其他应用服务器配置的JNDI

? b)关于JNDI的配置(Tomcat)

修改tomcat目录conf/context.xml文件：

    <Resource name="jcptDataSourceJNDI" auth="Container"
        type="javax.sql.DataSource" maxActive="100" maxIdle="30"           maxWait="10" username="tysp" password="12345678"
       driverClassName="oracle.jdbc.driver.OracleDriver"                   url="jdbc:oracle:thin:@192.168.1.35:1521:orcl" />

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? c)通过 JNDI 获取 DataSource:

?????? Context context = new InitialContext();

?????? DataSource ds =(DataSource)context.lookup("java:comp/env/jcptDataSourceJNDI");

2.?从第三方的连接池获得DataSource

要在Spring中使用DBCP连接池，需要引入commons-collections.jar、commons-dbcp.jar、commons-pool.jar

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName"
       value="oracle.jdbc.driver.OracleDriver">
    </property>
    <property name="url"
       value="jdbc:oracle:thin:@192.168.1.35:1521:orcl">
    </property>
    <property name="username" value="or_meal"></property>
    <property name="password" value="or_meal"></property>
    <property name="maxActive" value="100"></property>
    <property name="maxIdle" value="30"></property>
    <property name="maxWait" value="10"></property>
    <property name="defaultAutoCommit" value="false"></property>
</bean>
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="hibernateProperties">
       <props>
           <prop key="hibernate.dialect">
              org.hibernate.dialect.Oracle9Dialect
           </prop>
           <prop key="show_sql">true</prop>
           <prop key="format_sql">true</prop>
       </props>
    </property>
    <property name="mappingResources">
       <list></list>
    </property>
</bean>

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3.?使用DriverManagerDataSource获得DataSource