一、简介
Druid是阿里开源的一个JDBC应用组件, 其包括三部分:
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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:
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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
<p>更多详细信息参考官方文档:<a href="https://github.com/alibaba/druid/wiki">https://github.com/alibaba/druid/wiki</a></p> </li>
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
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.1.7.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.zzq</groupId>
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<artifactId>sping-data-monitor</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>sping-data-monitor</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>druid</artifactId>
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<version>1.1.10</version>
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</dependency>
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<!--修改MySQL驱动版本-->
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>5.1.47</version>
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<scope>runtime</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>
(3)application.properties配置
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application:
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name: sping-data-monitor # 暴露微服务名称
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#数据库配置
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# 驱动配置信息
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spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
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spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=false&zeroDateTimeBehavior=convertToNull
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spring.datasource.username=root
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spring.datasource.password=root
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spring.datasource.driver-class-name=com.mysql.jdbc.Driver
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# 连接池的配置信息
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# 初始化大小,最小,最大
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spring.datasource.initialSize=3
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spring.datasource.minIdle=5
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spring.datasource.maxActive=20
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# 配置获取连接等待超时的时间
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spring.datasource.maxWait=30000
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# 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
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spring.datasource.timeBetweenEvictionRunsMillis=60000
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# 配置一个连接在池中最小生存的时间,单位是毫秒
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spring.datasource.minEvictableIdleTimeMillis=300000
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spring.datasource.validationQuery=SELECT 1 FROM DUAL
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spring.datasource.testWhileIdle=true
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spring.datasource.testOnBorrow=false
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spring.datasource.testOnReturn=false
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# 打开PSCache,并且指定每个连接上PSCache的大小
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spring.datasource.poolPreparedStatements=true
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spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
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# 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
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spring.datasource.filters=stat,wall
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# 通过connectProperties属性来打开mergeSql功能;慢SQL记录
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spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=10000
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(4)DruidDBConfig
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package com.zzq.config;
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import com.alibaba.druid.pool.DruidDataSource;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.context.annotation.Primary;
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import javax.sql.DataSource;
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import java.sql.SQLException;
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@Configuration
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public class DruidDBConfig {
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private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class);
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@Value("${spring.datasource.url}")
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private String dbUrl;
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@Value("${spring.datasource.username}")
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private String username;
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@Value("${spring.datasource.password}")
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private String password;
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@Value("${spring.datasource.driver-class-name}")
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private String driverClassName;
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@Value("${spring.datasource.initialSize}")
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private int initialSize;
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@Value("${spring.datasource.minIdle}")
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private int minIdle;
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@Value("${spring.datasource.maxActive}")
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private int maxActive;
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@Value("${spring.datasource.maxWait}")
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private int maxWait;
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@Value("${spring.datasource.timeBetweenEvictionRunsMillis}")
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private int timeBetweenEvictionRunsMillis;
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@Value("${spring.datasource.minEvictableIdleTimeMillis}")
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private int minEvictableIdleTimeMillis;
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@Value("${spring.datasource.validationQuery}")
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private String validationQuery;
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@Value("${spring.datasource.testWhileIdle}")
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private boolean testWhileIdle;
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@Value("${spring.datasource.testOnBorrow}")
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private boolean testOnBorrow;
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@Value("${spring.datasource.testOnReturn}")
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private boolean testOnReturn;
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@Value("${spring.datasource.poolPreparedStatements}")
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private boolean poolPreparedStatements;
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@Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")
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private int maxPoolPreparedStatementPerConnectionSize;
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@Value("${spring.datasource.filters}")
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private String filters;
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@Value("{spring.datasource.connectionProperties}")
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private String connectionProperties;
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/**
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* @Bean 声明,DataSource 对象为 Spring 容器所管理;
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* @Primary 表示这里定义的DataSource将覆盖其他来源的DataSource。
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* StatFilter,用于统计监控信息。StatFilter的别名是stat。
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* 统计SQL信息,合并统计。mergeStat是的MergeStatFilter缩写。
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* 通过 DataSource 的属性<property name="filters" value="mergeStat" /> 或者
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* connectProperties属性来打开mergeSql功能 <property name="connectionProperties" value="druid.stat.mergeSql=true" />
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* StatFilter属性slowSqlMillis用来配置SQL慢的标准
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*
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* @return
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*/
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@Bean
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@Primary
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public DataSource dataSource() {
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DruidDataSource datasource = new DruidDataSource();
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datasource.setUrl(dbUrl);
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datasource.setDriverClassName(driverClassName);
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datasource.setUsername(username);
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datasource.setPassword(password);
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//configuration
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datasource.setInitialSize(initialSize);
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datasource.setMinIdle(minIdle);
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datasource.setMaxActive(maxActive);
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datasource.setMaxWait(maxWait);
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datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
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datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
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datasource.setValidationQuery(validationQuery);
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datasource.setTestWhileIdle(testWhileIdle);
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datasource.setTestOnBorrow(testOnBorrow);
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datasource.setTestOnReturn(testOnReturn);
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datasource.setPoolPreparedStatements(poolPreparedStatements);
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datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
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try {
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/**
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* 设置StatFilter,用于统计监控信息。
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* StatFilter的别名是stat
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*
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*/
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datasource.setFilters(filters);
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} catch (SQLException e) {
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logger.error("druid configuration initialization filter : {0}",e);
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}
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datasource.setConnectionProperties(connectionProperties);
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return datasource;
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}
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}
(5)DruidStatFilter
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package com.zzq.filter;
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import com.alibaba.druid.support.http.WebStatFilter;
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import javax.servlet.annotation.WebFilter;
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import javax.servlet.annotation.WebInitParam;
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/**
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* WebStatFilter用于采集web-jdbc关联监控的数据。
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* 属性filterName声明过滤器的名称,可选
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* 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)
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*/
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@WebFilter(
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urlPatterns = "/sping-data-monitor/*",
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initParams = {
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@WebInitParam(name = "exclusions",value = "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*")
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}
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)
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public class DruidStatFilter extends WebStatFilter {
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}
(6)DruidStatViewServlet
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package com.zzq.servlet;
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import com.alibaba.druid.support.http.StatViewServlet;
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import javax.servlet.annotation.WebInitParam;
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import javax.servlet.annotation.WebServlet;
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/**
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* StatViewServlet用于展示Druid的统计信息。
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* 提供监控信息展示的html页面
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* 提供监控信息的JSON API
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*
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* 内置监控页面的首页是/druid/index.html
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*
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*/
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/**
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* @Webservlet
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* 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,
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* 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。
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*
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*/
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@WebServlet(
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urlPatterns = {"/druid/*"},//#监控地址,默认 /druid/*
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initParams = {
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@WebInitParam(name = "loginUsername", value = "admin"),//#登录用户名
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@WebInitParam(name = "loginPassword", value = "admin"),//#登录密码
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@WebInitParam(name = "resetEnable", value = "false"),
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// @WebInitParam(name = "allow", value = "127.0.0.1") #IP 白名单
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}
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)
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public class DruidStatViewServlet extends StatViewServlet {
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}
(7)启动类
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package com.zzq;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.web.servlet.ServletComponentScan;
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@SpringBootApplication
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@ServletComponentScan(basePackages = {"com.zzq.**.servlet"})
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public class SpingDataMonitorApplication {
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public static void main(String[] args) {
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SpringApplication.run(SpingDataMonitorApplication.class, args);
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}
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}
(8)效果
http://localhost:8080/druid/login.html
用户名/密码 admin/admin