1、Druid简单介绍,具体看官网;
Druid是Java中目前最好的数据库连接池,在功能、性能、扩展性方面,都超过其他数据库连接池,并且能够提供强大的监控和扩展功能,包括很多维度的统计和分析功能。包括DBCP、C3P0、BoneCP、Proxool、JBoss DataSource。Druid已经在阿里巴巴部署了超过600个应用,经过一年多生产环境大规模部署的严苛考验。Druid是阿里巴巴开发的号称为监控而生的数据库连接池!
更多介绍:https://blog.csdn.net/nuliperfect/article/details/52108036
2、在pom.xml配置druid依赖包;
<dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.18</version> </dependency>
3、配置application.properties加入数据库源类型等参数;
######################################################## #druid相关配置 ######################################################## # 数据库访问配置 # 主数据源,默认的 spring.datasource.type=com.alibaba.druid.pool.DruidDataSource spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test spring.datasource.username=root spring.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=5 spring.datasource.minIdle=5 spring.datasource.maxActive=20 # 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=300000 spring.datasource.validationQuery=SELECT 1 FROM DUAL spring.datasource.testWhileIdle=true spring.datasource.testOnBorrow=false spring.datasource.testOnReturn=false # 打开PSCache,并且指定每个连接上PSCache的大小 spring.datasource.poolPreparedStatements=true 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,log4j # 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
这时候启动应用就可以看到看到打印信息就是使用我们配置的数据源了:[main] com.alibaba.druid.pool.DruidDataSource : {dataSource-1} inited
4、编写druid servlet和filter提供监控页面访问;
方法一:添加servlet和filter,并在spring-boot的app.java文件中添加@ServletComponentScan注解。
DruidStatViewServlet文件:
package com.gongh.config; import javax.servlet.annotation.WebInitParam; import javax.servlet.annotation.WebServlet; import com.alibaba.druid.support.http.StatViewServlet; /** * druid数据源状态监控. * @author gh *druid配置监控统计功能 *方法一: 添加servlet和filter,并在spring-boot的app.java文件中添加@ServletComponentScan注解 *然后启动项目后访问 http://localhost:端口号/druid/index.html 即可查看数据源及SQL统计等。 */ @WebServlet(urlPatterns="/druid/*",initParams={ @WebInitParam(name="allow",value="192.168.1.66,127.0.0.1"),// IP白名单 (没有配置或者为空,则允许所有访问) @WebInitParam(name="deny",value="192.168.1.88"),// IP黑名单 (存在共同时,deny优先于allow) @WebInitParam(name="loginUsername",value="admin"),// 用户名 @WebInitParam(name="loginPassword",value="123456"),// 密码 @WebInitParam(name="resetEnable",value="false")// 禁用HTML页面上的“Reset All”功能 }) public class DruidStatViewServlet extends StatViewServlet{ private static final long serialVersionUID = 1L; }
DruidStatFilter文件:
package com.gongh.config; import javax.servlet.annotation.WebFilter; import javax.servlet.annotation.WebInitParam; import com.alibaba.druid.support.http.WebStatFilter; /** * druid 监控器 * @author gh * */ @WebFilter(filterName="druidWebStatFilter",urlPatterns="/*", initParams={@WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")// 忽略资源 }) public class DruidStatFilter extends WebStatFilter{ }
方法二:使用代码注册servlet
package com.gongh.config; 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; /** *druid配置监控统计功能方法二 * 使用代码注册Servlet,这样的方式不需要添加注解:@ServletComponentScan * 然后启动项目后访问 http://localhost:端口号/druid2/index.html 即可查看数据源及SQL统计等。 * @author gh */ @Configuration public class 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(),"/druid2/*"); //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","admin2"); 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 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/*"); return filterRegistrationBean; } }
方法三:web.xml配置方式
spring配置文件添加如下:
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close"> <property value="${jdbc_url}" name="url"></property> <property value="${jdbc_user}" name="username"></property> <property value="${jdbc_password}" name="password"></property> <property value="stat" name="filters"></property> <property value="20" name="maxActive"></property> <property value="1" name="initialSize"></property> <property value="60000" name="maxWait"></property> <property value="1" name="minIdle"></property> <property value="60000" name="timeBetweenEvictionRunsMillis"></property> <property value="300000" name="minEvictableIdleTimeMillis"></property> <property value="SELECT 'x'" name="validationQuery"></property> <property value="true" name="testWhileIdle"></property> <property value="false" name="testOnBorrow"></property> <property value="false" name="testOnReturn"></property> <property value="true" name="poolPreparedStatements"></property> <property value="20" name="maxPoolPreparedStatementPerConnectionSize"></property> </bean>
web.xml中配置如下:
<servlet> <servlet-name>DruidStatView</servlet-name> <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>DruidStatView</servlet-name> <url-pattern>/druid/*</url-pattern> </servlet-mapping> </servlet>
基本配置完成,可以查看内置监控页面了,路径是/druid/index.html
感觉咋样?是不是so easy??