第一章 Spring管理第三方bean

1.1 Spring管理druid步骤

• 导入jar包

  <!--导入druid的jar包--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><!--导入mysql的jar包--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.37</version>
  <!--            <version>8.0.26</version>--></dependency>
  

• 编写db.properties配置文件

  #key=value
  db.driverClassName=com.mysql.jdbc.Driver
  db.url=jdbc:mysql://localhost:3306/db220106
  db.username=root
  db.password=root
  

• 编写applicationContext.xml相关代码

  <!--    加载外部属性文件db.properties-->
  <context:property-placeholder location="classpath:db.properties"></context:property-placeholder><!--    装配数据源-->
  <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"><property name="driverClassName" value="${db.driverClassName}"></property><property name="url" value="${db.url}"></property><property name="username" value="${db.username}"></property><property name="password" value="${db.password}"></property>
  </bean>
  

• 测试

  @Test
  public void testDruidDataSource() throws Exception{//获取容器对象ApplicationContext ioc =new ClassPathXmlApplicationContext("applicationContext_druid.xml");DruidDataSource dataSource = ioc.getBean("dataSource", DruidDataSource.class);System.out.println("dataSource = " + dataSource);DruidPooledConnection connection = dataSource.getConnection();System.out.println("connection = " + connection);}