Spring框架DateSource注入

定义个测试类用来获取链接
import javax.sql.DataSource; 
import java.sql.Connection; 
                                                                                
public class DataBean { 
    private DataSource dataSource; 
                                                                                
    public void setDataSource(DataSource dataSource) { 
        this.dataSource = dataSource; 
    } 
                                                                                
    public void testDataSource() { 
        try { 
            Connection connection = dataSource.getConnection(); 
            if(connection != null) 
                System.out.println("test ok!"); 
        } 
        catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
}
Spring提供了org.springframework.jdbc.datasource.DriverManagerDataSource來取得DataSource。该类是在Spring-dao.jar中.如果只有Spring-core,需要导入,如果有Spring.jar无需导入。而且还有有MYsql数据库的驱动jar
<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN" "http://www.springframework.org/dtd/spring-beans.dtd"> 
<beans> 
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
        <property name="driverClassName"> 
            <value>com.mysql.jdbc.Driver</value> 
        </property> 
        <property name="url"> 
            <value>jdbc:mysql://localhost:3306/TestDB</value> 
        </property> 
        <property name="username"> 
            <value>caterpillar</value> 
        </property> 
        <property name="password"> 
            <value>123456</value> 
        </property> 
    </bean> 
                                                                                
    <bean id="dataBean" class="com.baidu.DataBean"> 
        <property name="dataSource"> 
            <ref bean="dataSource"/> 
        </property> 
    </bean> 
</beans>
测试是否连接到数据库
BeanDefinitionRegistry reg = new DefaultListableBeanFactory(); 
XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(reg); 
                                                                                
reader.loadBeanDefinitions(new ClassPathResource("bean.xml"));; 
                                                                                
BeanFactory bf = (BeanFactory) reg; 
DataBean dataBean = (DataBean) bf.getBean("dataBean"); 
dataBean.testDataSource();
测试成功！
关于org.springframework.jdbc.datasource.DriverManagerDataSource并没有提供连接池功能,只能做个连接的测试。应该换上org.apache.commons.dbcp.BasicDataSource,提供了数据库连接池功能。
导入commons-dbcp.jar,commons-pool.jar,commons-collections.jar
<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN" "http://www.springframework.org/dtd/spring-beans.dtd"> 
<beans> 
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> 
        <property name="driverClassName"> 
            <value>com.mysql.jdbc.Driver</value> 
        </property> 
        <property name="url"> 
            <value>jdbc:mysql://localhost:3306/TestDB</value> 
        </property> 
        <property name="username"> 
            <value>caterpillar</value> 
        </property> 
        <property name="password"> 
            <value>123456</value> 
        </property> 
    </bean> 
    <bean id="dataBean" class="com.baidu.DataBean"> 
        <property name="dataSource"> 
            <ref bean="dataSource"/> 
        </property> 
    </bean> 
</beans>
如果想使用JDBC进行数据库操作可以用:
org.springframework.jdbc.datasource.DataSourceUtils
Connection conn = DataSourceUtils.getConnection(dataSource);
這樣作的好處是，所有的SQLException都被Spring的DataAccessException子類CannotGetJdbcConnectionException包裝起來。您可以獲得更多的資訊，並保證存儲層的可移值性。
关闭连接方式DataSourceUtils.closeConnectionIfNecessry(connection, dataSource);