本文主要是介绍Druid数据库监控,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
一、简介
Druid是阿里开源的一个JDBC应用组件, 其包括三部分:
-
DruidDriver: 代理Driver,能够提供基于Filter-Chain模式的插件体系。
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DruidDataSource: 高效可管理的数据库连接池。
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SQLParser: 实用的SQL语法分析
通过Druid连接池中间件, 我们可以实现:
-
可以监控数据库访问性能,Druid内置提供了一个功能强大的StatFilter插件,能够详细统计SQL的执行性能,这对于线上分析数据库访问性能有帮助。
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替换传统的DBCP和C3P0连接池中间件。Druid提供了一个高效、功能强大、可扩展性好的数据库连接池。
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数据库密码加密。直接把数据库密码写在配置文件中,容易导致安全问题。DruidDruiver和DruidDataSource都支持PasswordCallback。
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SQL执行日志,Druid提供了不同的LogFilter,能够支持Common-Logging、Log4j和JdkLog,你可以按需要选择相应的LogFilter,监控你应用的数据库访问情况。
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扩展JDBC,如果你要对JDBC层有编程的需求,可以通过Druid提供的Filter-Chain机制,很方便编写JDBC层的扩展插件
更多详细信息参考官方文档:https://github.com/alibaba/druid/wiki
Druid Spring Boot Starter 是阿里官方提供的 Spring Boot 插件,用于帮助在Spring Boot项目中轻松集成Druid数据库连接池和监控。
更多资料参考:
Druid: https://github.com/alibaba/druid
Druid Spring Starter: https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter
二、搭建demo
(1)创建项目
创建spring boot项目
(2)依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.7.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.zzq</groupId><artifactId>sping-data-monitor</artifactId><version>0.0.1-SNAPSHOT</version><name>sping-data-monitor</name><description>Demo project for Spring Boot</description><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><!--修改MySQL驱动版本--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version><scope>runtime</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>
(3)application.properties配置
application:
name: sping-data-monitor # 暴露微服务名称
#数据库配置
# 驱动配置信息
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=false&zeroDateTimeBehavior=convertToNull
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver# 连接池的配置信息
# 初始化大小,最小,最大
spring.datasource.initialSize=3
spring.datasource.minIdle=5
spring.datasource.maxActive=20# 配置获取连接等待超时的时间
spring.datasource.maxWait=30000
# 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
# 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=10000
(4)DruidDBConfig
package com.zzq.config;import com.alibaba.druid.pool.DruidDataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;import javax.sql.DataSource;
import java.sql.SQLException;@Configuration
public class DruidDBConfig {private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class);@Value("${spring.datasource.url}")private String dbUrl;@Value("${spring.datasource.username}")private String username;@Value("${spring.datasource.password}")private String password;@Value("${spring.datasource.driver-class-name}")private String driverClassName;@Value("${spring.datasource.initialSize}")private int initialSize;@Value("${spring.datasource.minIdle}")private int minIdle;@Value("${spring.datasource.maxActive}")private int maxActive;@Value("${spring.datasource.maxWait}")private int maxWait;@Value("${spring.datasource.timeBetweenEvictionRunsMillis}")private int timeBetweenEvictionRunsMillis;@Value("${spring.datasource.minEvictableIdleTimeMillis}")private int minEvictableIdleTimeMillis;@Value("${spring.datasource.validationQuery}")private String validationQuery;@Value("${spring.datasource.testWhileIdle}")private boolean testWhileIdle;@Value("${spring.datasource.testOnBorrow}")private boolean testOnBorrow;@Value("${spring.datasource.testOnReturn}")private boolean testOnReturn;@Value("${spring.datasource.poolPreparedStatements}")private boolean poolPreparedStatements;@Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")private int maxPoolPreparedStatementPerConnectionSize;@Value("${spring.datasource.filters}")private String filters;@Value("{spring.datasource.connectionProperties}")private String connectionProperties;/*** @Bean 声明,DataSource 对象为 Spring 容器所管理;* @Primary 表示这里定义的DataSource将覆盖其他来源的DataSource。* StatFilter,用于统计监控信息。StatFilter的别名是stat。* 统计SQL信息,合并统计。mergeStat是的MergeStatFilter缩写。* 通过 DataSource 的属性<property name="filters" value="mergeStat" /> 或者* connectProperties属性来打开mergeSql功能 <property name="connectionProperties" value="druid.stat.mergeSql=true" />* StatFilter属性slowSqlMillis用来配置SQL慢的标准** @return*/@Bean@Primarypublic DataSource dataSource() {DruidDataSource datasource = new DruidDataSource();datasource.setUrl(dbUrl);datasource.setDriverClassName(driverClassName);datasource.setUsername(username);datasource.setPassword(password);//configurationdatasource.setInitialSize(initialSize);datasource.setMinIdle(minIdle);datasource.setMaxActive(maxActive);datasource.setMaxWait(maxWait);datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);datasource.setValidationQuery(validationQuery);datasource.setTestWhileIdle(testWhileIdle);datasource.setTestOnBorrow(testOnBorrow);datasource.setTestOnReturn(testOnReturn);datasource.setPoolPreparedStatements(poolPreparedStatements);datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);try {/*** 设置StatFilter,用于统计监控信息。* StatFilter的别名是stat**/datasource.setFilters(filters);} catch (SQLException e) {logger.error("druid configuration initialization filter : {0}",e);}datasource.setConnectionProperties(connectionProperties);return datasource;}}
(5)DruidStatFilter
package com.zzq.filter;import com.alibaba.druid.support.http.WebStatFilter;import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;/*** WebStatFilter用于采集web-jdbc关联监控的数据。* 属性filterName声明过滤器的名称,可选* 属性urlPatterns指定要过滤 的URL模式,也可使用属性value来声明.(指定要过滤的URL模式是必选属性)*/@WebFilter(urlPatterns = "/sping-data-monitor/*",initParams = {@WebInitParam(name = "exclusions",value = "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*")}
)
public class DruidStatFilter extends WebStatFilter {
}
(6)DruidStatViewServlet
package com.zzq.servlet;import com.alibaba.druid.support.http.StatViewServlet;import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;/*** StatViewServlet用于展示Druid的统计信息。* 提供监控信息展示的html页面* 提供监控信息的JSON API** 内置监控页面的首页是/druid/index.html**//*** @Webservlet* 有两个属性可以用来表示Servlet的访问路径,分别是value和urlPatterns。value和urlPatterns都是数组形式,* 表示我们可以把一个Servlet映射到多个访问路径,但是value和urlPatterns不能同时使用。**/
@WebServlet(urlPatterns = {"/druid/*"},//#监控地址,默认 /druid/*initParams = {@WebInitParam(name = "loginUsername", value = "admin"),//#登录用户名@WebInitParam(name = "loginPassword", value = "admin"),//#登录密码@WebInitParam(name = "resetEnable", value = "false"),
// @WebInitParam(name = "allow", value = "127.0.0.1") #IP 白名单}
)
public class DruidStatViewServlet extends StatViewServlet {
}
(7)启动类
package com.zzq;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;@SpringBootApplication
@ServletComponentScan(basePackages = {"com.zzq.**.servlet"})
public class SpingDataMonitorApplication {public static void main(String[] args) {SpringApplication.run(SpingDataMonitorApplication.class, args);}}
(8)效果
http://localhost:8080/druid/login.html
用户名/密码 admin/admin
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