①. Spring配置数据源
①. 可以将DataSource的创建权交由Spring容器去完成
②. DataSource有无参构造方法,而Spring默认就是通过无参构造方法实例化对象的
③. DataSource要想使用需要通过set方法设置数据库连接信息,而Spring可以通过set方法进行字符串注入
④. 项目工程搭建,下面是工程图示
jar包: <!--导入spring的context坐标,context依赖core、beans、expression--> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> </dependency> <!-- C3P0连接池 --> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.2</version> </dependency> <!-- Druid连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.10</version> </dependency> <!-- mysql驱动 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.39</version> </dependency>
#jdbc.properties jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/day18 jdbc.username=root jdbc.password=root
//applicationContext.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--加载外部的properties文件--> <context:property-placeholder location="classpath:jdbc.properties"/> <!--配置的c3p0--> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}"></property> <property name="jdbcUrl" value="${jdbc.url}"></property> <property name="user" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> </bean> <!--配置数据源--> <bean id="druidDataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}"></property> <property name="url" value="${jdbc.url}"></property> <property name="username" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> </bean> </beans>
//DataSourceTest @Test public void DataSourceTest() throws SQLException { ApplicationContext app=new ClassPathXmlApplicationContext("applicationContext.xml"); DruidDataSource dataSource = app.getBean(DruidDataSource.class); Connection connection = dataSource.getConnection(); System.out.println(connection); }
