Springboot整合（7）——数据库连接池Druid
1. pom中引入Druid依赖
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
2. 在application.yml中对druid进行配置，将之前spring datasource的配置修改为如下内容：红色内容为新增
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
url: jdbc:mysql://localhost:3306/knowledgeisland?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&allowMultiQueries=true
username: school
password: school888888
driver-class-name: com.mysql.jdbc.Driver
# 下面为连接池的补充设置，应用到上面所有数据源中
initialSize: 5
minIdle: 5
maxActive: 20
# 配置获取连接等待超时的时间
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
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
# 打开PSCache，并且指定每个连接上PSCache的大小
poolPreparedStatements: true
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
filters: stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
3. 编写DruidConfiguration类
@Configuration
publicclass DruidConfiguration {
/**
* 注册一个StatViewServlet
*
* @return
*/
@Bean
public ServletRegistrationBean DruidStatViewServle2() {
// 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", "admin");
servletRegistrationBean.addInitParameter("loginPassword", "123456");
// 是否能够重置数据.
servletRegistrationBean.addInitParameter("resetEnable", "false");
returnservletRegistrationBean;
}
/**
* 注册一个：filterRegistrationBean
*
* @return
*/
@Bean
public FilterRegistrationBean druidStatFilter2() {
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,/druid2/*");
returnfilterRegistrationBean;
}
}
4. 测试，访问http://localhost:8088/KnowledgeIsland/druid/，输入DruidConfiguration中配置的用户名密码 
进入后就可以看到druid的监控后台，
