使用Spring Boot如何实现集成Druid数据库连接池

<parent>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-parent</artifactId>  <version>1.3.5.RELEASE</version></parent><properties>  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>  <java.version>1.8</java.version></properties><dependencies>  <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-web</artifactId>  </dependency>  <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-jdbc</artifactId>  </dependency>  <dependency>    <groupId>com.alibaba</groupId>    <artifactId>druid</artifactId>    <version>1.0.20</version>  </dependency>  <dependency>    <groupId>org.postgresql</groupId>    <artifactId>postgresql</artifactId>    <scope>runtime</scope>  </dependency></dependencies>