spring boot 整合 druid（深入浅出）

<!-- https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.1.9</version>
    </dependency>

/**
 * 
 */
package com.yuyi.mcb.druid;
 
import javax.sql.DataSource;
 
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DatabaseDriver;
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 com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
 
/**
 * @author mcb
 * 2018年5月4日 上午10:16:19
 *         
 */
@Configuration
@ConditionalOnClass(com.alibaba.druid.pool.DruidDataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "com.alibaba.druid.pool.DruidDataSource", matchIfMissing = true)
public class DruidDataSourceConfiguration {
  @SuppressWarnings("unchecked")
    protected <T> T createDataSource(DataSourceProperties properties,
                                     Class<? extends DataSource> type) {
        return (T) properties.initializeDataSourceBuilder().type(type).build();
    }
   /**
     * @see org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.Tomcat 
     * @param properties 读入的配置
     * @return DruidDataSource
     */
  @Bean
    @ConfigurationProperties("spring.datasource.druid")
    public com.alibaba.druid.pool.DruidDataSource dataSource(DataSourceProperties properties) {
        com.alibaba.druid.pool.DruidDataSource dataSource = createDataSource(
                properties, com.alibaba.druid.pool.DruidDataSource.class);
 
        DatabaseDriver databaseDriver = DatabaseDriver.fromJdbcUrl(properties.determineUrl());
        String validationQuery = databaseDriver.getValidationQuery();
        if (validationQuery != null) {
            dataSource.setTestOnBorrow(true);
            dataSource.setValidationQuery(validationQuery);
        }
        return dataSource;
    }
   /**
     * 注册一个StatViewServlet
     */
    @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");
        //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","root");
        servletRegistrationBean.addInitParameter("loginPassword","password");
        //是否能够重置数据.
        servletRegistrationBean.addInitParameter("resetEnable","false");// 禁用HTML页面上的“Reset All”功能
        return servletRegistrationBean;
    }
  
    /**
     * 注册一个：filterRegistrationBean
     */
    @Bean
    public FilterRegistrationBean druidStatFilter(){
 
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        filterRegistrationBean.setName("druidWebStatFilter");
        //添加过滤规则.
        filterRegistrationBean.addUrlPatterns("/*");
        //添加忽略的格式信息.
        filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }
  
  
  
  
  
  
}

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
# 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.druid.initialSize=5
spring.datasource.druid.minIdle=5
spring.datasource.druid.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.druid.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.druid.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.druid.minEvictableIdleTimeMillis=300000
spring.datasource.druid.validationQuery=SELECT 1 FROM t_user
spring.datasource.druid.testWhileIdle=true
spring.datasource.druid.testOnBorrow=true
spring.datasource.druid.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.druid.poolPreparedStatements=true
spring.datasource.druid.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.druid.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.druid.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
#spring.datasource.druid.useGlobalDataSourceStat=true