Spring入门Blog[十、Spring DBCP用xml和properties2种格式配置DataSource]

Spring提供数据库连接池：DBCP配置DataSource并且获取连接完成数据库操作：

Spring帮助文档的地址：

http://static.springsource.org/spring/docs/2.5.6/reference/beans.html#beans-value-element

以下内容需要导入的jar包：

commons-dbcp.jar

commons-pool.jar

mysql-connector-java-5.0-nightly-20071116-bin.jar

1. 首先在容器内配置数据源

<!-- 配置数据源 -->
 <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
  <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
  <property name="url" value="jdbc:mysql://localhost:3306/sms"/>
  <property name="username" value="root"/>
  <property name="password" value="root"/>
</bean>

2.拿到注入数据源并且编写对数据库的操作

@Component("userService")
public class UserServiceImpl implements UserService{
	private UserDao userDao;
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	@Resource //resource注入
	private DataSource myDataSource;
	public DataSource getMyDataSource() {
		return myDataSource;
	}
	public void setMyDataSource(DataSource myDataSource) {
		this.myDataSource = myDataSource;
	}
	//在下面方法前面加逻辑
	public void save(){
		try{
			//拿到连接执行操作
			Connection conn = myDataSource.getConnection();
			conn.createStatement().execute("insert into dept values('6','bumen2')");
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}

3.测试运行

@Test
	public void test01() {
		BeanFactory applicationContext = new ClassPathXmlApplicationContext(
				"beans.xml");
		UserService user = (UserService) applicationContext.getBean("userService");
		user.save();
	}

----------------------------------------------------------------------------------------------------------------------------------通过Properties的方式配置xml的datasource：

1、 编写properties文件：

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/sms
jdbc.username=root
jdbc.password=root

2、编写xml容器配置：

<!-- placeholder 占位符 -->
	<bean
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<value>classpath:jdbc.properties</value>
		</property>
	</bean>

	<bean id="dataSource" destroy-method="close"
		class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName" value="${jdbc.driverClassName}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
	</bean>