spring boot配置druid连接池的完整步骤

<dependency>
 <groupId>com.alibaba</groupId>
 <artifactId>druid</artifactId>
 <version>1.1.12</version>
</dependency>

@Configuration//在项目启动时可以初始化配置
public class DruidConfiguration {
 @Bean
 public ServletRegistrationBean staViewServlet(){
  ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),
    "/druid/*");
  //白名单为空允许任何ip访问
  servletRegistrationBean.addInitParameter("allow","127.0.0.1");
  //ip黑名单(存在共同时，deny优先于allow)：如果满足deny的即提示：Sorry you are not permitted...
  servletRegistrationBean.addInitParameter("deny","127.0.0.2");
  //登录查看信息的账号密码
  servletRegistrationBean.addInitParameter("loginUsername","druid");
  servletRegistrationBean.addInitParameter("loginPassword","druid");
  //是否能够重置数据
  servletRegistrationBean.addInitParameter("resetEnable","true");
  return servletRegistrationBean;
 }

 @Bean
 public FilterRegistrationBean statFilter(){
  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,*.jpn,*.png,*.css,*.ico,/druid/*");
  return filterRegistrationBean;
 }

 //配置数据库的基本连接信息
 @Bean
 @Primary
 @ConfigurationProperties(prefix = "spring.datasource")//在application.properties中读取配置信息注入到DruidDataSource里
 public DataSource dataSource(){
  DruidDataSource druidDataSource = DataSourceBuilder.create().type(DruidDataSource.class).build();
  druidDataSource.setInitialSize(3);//初始化物理连接的数量
  try {
   druidDataSource.addFilters("stat,wall");//stat是sql监控，wall是防火墙(如果不添加则监控无效)，不能添加log4j不然会出错
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return druidDataSource;
 }

}

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/mrbshiro?characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=123456