spring中通过JNDI、DBCP、C3P0配置数据源

JNDI配置数据源

1、首先在tomcat的server.xml中配置数据源信息，找到Context，然后在里边加入如下代码

<Context docBase="SpringDemo" path="/" reloadable="true" source="org.eclipse.jst.jee.server:SpringDemo">

      <Resource name="jdbc/demoDB"
         auth="Container"
         type="javax.sql.DataSource"
         driverClassName="oracle.jdbc.driver.OracleDriver"
         url="jdbc:oracle:thin:@//127.0.0.1:1521/zpc"
         username="test"
         password="test"
         maxActive="20"
         maxIdle="10"
         maxWait="10000"/>  

      </Context>

　2、applicationContext.xml中注入bean，就这样数据源配置成功。

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

DBCP配置数据源

配置applicationContext.xml中的bean

<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@//127.0.0.1:1521/zpc"></property>
        <property name="username" value="test"></property>
        <property name="password" value="test"></property>
        <property name="initialSize" value="5"></property>
    </bean>

c3p0配置数据源

配置applicationContext.xml中的bean

<bean id="dataSource" name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="jdbcUrl" value="jdbc:oracle:thin:@//127.0.0.1:1521/zpc"></property>
        <property name="user" value="test"></property>
        <property name="password" value="test"></property>
        <property name="initialPoolSize" value="5"></property>
    </bean>  

**各种方式都需要导入各自的jar包