Spring管理数据源和引用外部属性文件

引用外部属性文件

加入依赖

<!-- MySQL驱动 -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.16</version>
</dependency>
<!-- 数据源 -->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.0.31</version>
</dependency>

创建外部属性文件

jdbc.user=root
jdbc.password=atguigu
jdbc.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC
jdbc.driver=com.mysql.cj.jdbc.Driver

引入属性文件并配置bean

<!-- 引入外部属性文件 -->
<context:property-placeholder location="classpath:jdbc.properties"/>

<bean id="druidDataSource" class="com.alibaba.druid.pool.DruidDataSource">
  <property name="url" value="${jdbc.url}"/>
  <property name="driverClassName" value="${jdbc.driver}"/>
  <property name="username" value="${jdbc.user}"/>
  <property name="password" value="${jdbc.password}"/>
</bean>

 测试

@Test
public void testDataSource() throws SQLException {
  ApplicationContext ac = new ClassPathXmlApplicationContext("spring-
datasource.xml");
  DataSource dataSource = ac.getBean(DataSource.class);
  Connection connection = dataSource.getConnection();
  System.out.println(connection);
}