springboot——数据层访问搭建 集成Duid连接池

springboot中默认是使用的tomcat的连接池，如果我们想要第三方的连接池，我们这么配置呢？

首先在application.yml文件中注释掉之前数据库的配置，重新用druid的方式配置：

#spring:
 #datasource:
  #  driver-class-name: com.mysql.jdbc.Driver
   # url: jdbc:mysql://127.0.0.1:3306/house
    #username: root
    #password: root
mybatis.config-location = classpath:/mybatis/mybatis-config.xml

spring.druid.url = jdbc:mysql://127.0.0.1:3306/house
spring.druid.username = root
spring.druid.password = root
spring.druid.driverClassName = com.mysql.jdbc.Driver  

spring.druid.initialSize=
spring.druid.minIdle=
spring.druid.maxActive=

spring.druid.maxWait=
spring.druid.timeBetweenEvictionRunsMillis=
spring.druid.minEvictableIdleTimeMillis=
spring.druid.validationQuery=SELECT  FROM DUAL
spring.druid.testWhileIdle=true

在pom文件中配置依赖库：

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.</version>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>18.0</version>    <!--特别注意这个地方版本也不能乱  -->
        </dependency>

新建DruidConfig配置文件：

@Configuration
public class DruidConfig {

    @ConfigurationProperties(prefix="spring.druid")  //将配置文件中spring.druid.*配置到DruidDataSource中
    @Bean(initMethod="init",destroyMethod="close")
    public DruidDataSource dataSource(Filter statFilter) throws SQLException{
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setProxyFilters(Lists.newArrayList(statFilter()));
        return dataSource;
    }

    //配置慢连接过滤
    @Bean
    public Filter statFilter(){
        StatFilter filter = new StatFilter();
        filter.setSlowSqlMillis();
        filter.setLogSlowSql(true);
        filter.setMergeSql(true);
        return filter;
    }

    //添加监控，可以帮助我们分析慢sql和每个sql的执行时间
    @Bean
    public ServletRegistrationBean servletRegistrationBean(){
        return new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
    }

}

然后启动项目，在浏览器中输入地址http://127.0.0.1:8080/user对数据库中的user表进行查询后，再访问http://127.0.0.1:8080/druid将会显示页面如下，可以对数据源、sql监控等进行查询：