具体如下：

druid 是阿里开源的数据库连接池。

开发时整合 druid 数据源过程。

1.修改pom.xml

 mysql  mysql-connector-java  com.alibaba  druid  1.0.26

增加上面的配置。

2.编辑配置数据源代码

package com.neo.conf;import javax.sql.DataSource;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.boot.web.servlet.ServletRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;import com.alibaba.druid.pool.DruidDataSource;import com.alibaba.druid.support.http.StatViewServlet;import com.alibaba.druid.support.http.WebStatFilter;@Configuration@ConfigurationProperties(value = "classpath:druid.properties")public class DruidConfiguration {  @Bean(destroyMethod = "close", initMethod = "init")  @ConfigurationProperties(prefix = "spring.datasource")  public DataSource druidDataSource() {    DruidDataSource druidDataSource = new DruidDataSource();    return druidDataSource;  }  /**   * 注册一个StatViewServlet   * @return   */  @Bean  public ServletRegistrationBean druidStatViewServlet(){    //org.springframework.boot.context.embedded.ServletRegistrationBean提供类的进行注册.    ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");    //添加初始化参数：initParams    //白名单：    servletRegistrationBean.addInitParameter("allow","127.0.0.1,192.168.31.77");    //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.    servletRegistrationBean.addInitParameter("deny","192.168.1.73");    //登录查看信息的账号密码.    servletRegistrationBean.addInitParameter("loginUsername","admin");    servletRegistrationBean.addInitParameter("loginPassword","123456");    //是否能够重置数据.    servletRegistrationBean.addInitParameter("resetEnable","false");    return servletRegistrationBean;  }  /**   * 注册一个：filterRegistrationBean   * @return   */  @Bean  public FilterRegistrationBean druidStatFilter(){    FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());    //添加过滤规则.    filterRegistrationBean.addUrlPatterns("/*");    //添加不需要忽略的格式信息.    filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");    return filterRegistrationBean;  }}

3.编写配置文件 druid.properties

spring.datasource.driverClassName=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/mycine?useUnicode=true&characterEncoding=utf8&autoReconnect=truespring.datasource.username=rootspring.datasource.password=root#--------------------------# 下面为连接池的补充设置，应用到上面所有数据源中# 初始化大小，最小，最大spring.datasource.initialSize=5spring.datasource.minIdle=5spring.datasource.maxActive=50# 配置获取连接等待超时的时间spring.datasource.maxWait=60000# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒spring.datasource.timeBetweenEvictionRunsMillis=60000# 配置一个连接在池中最小生存的时间，单位是毫秒spring.datasource.minEvictableIdleTimeMillis=300000spring.datasource.validationQuery=SELECT 1spring.datasource.testWhileIdle=truespring.datasource.testOnBorrow=falsespring.datasource.testOnReturn=false# 打开PSCache，并且指定每个连接上PSCache的大小spring.datasource.poolPreparedStatements=false#spring.datasource.maxPoolPreparedStatementPerConnectionSize=20# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙#spring.datasource.filters=stat,wall,log4jspring.datasource.filters=stat# 通过connectProperties属性来打开mergeSql功能；慢SQL记录spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000# 合并多个DruidDataSource的监控数据#spring.datasource.useGlobalDataSourceStat=true