Spring DBCP 数据库连接池配置

在beans.xml里面对DataSource进行配置
<bean id="dataSource" 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/spring" />
<property name="username" value="root" />
<property name="password" value="***" />
</bean>

public class UserDAOImpl implements UserDAO {

@Resource        //DI  Dependency Injection
private DataSource dataSource;

public void save(User user) {
try {
Connection conn = dataSource.getConnection();
conn.createStatement().executeUpdate("insert into user values (null , 'roy')");
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
System.out.println("user saved!");
}

public DataSource getDataSource() {
return dataSource;
}

public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
}

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<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>
<context:property-placeholder location="jdbc.properties" />

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