HikariCP与AlibabaDruid连接池简述-Spring入门学习笔记03

课程内容来自极客时间玩转Spring全家桶，链接如下
https://time.geekbang.org/course/intro/100023501

第三天

Part1HikariCP

光（ひかり）源自日语，顾名思义，说明连接池特别快
https://github.com/brettwooldridge/HikariCP
概念大体上源于：在各种各样的地方做了各种各样的优化（字节码上的优化与很多小改进）
在SpringBoot2.X版本默认使用HikariCP数据源连接池
常见配置如下

spring.datasource.hikari.maximumPoolSize =10
spring.datasource.hikari.minimumldle=10
spring.datasource.hikari.idleTimeout=600000
spring.datasource.hikari.connectionTimeout=30000
spring.datasource.hikari.maxLifetime=1800000

Part2AlibabaDruid

阿里巴巴开源连接池，最大的特点是监控特性不影响性能
https://github.com/alibaba/druid



通过druid-spring-boot-starter

在demo中启动程序，程序重写覆盖了connection_connectBefore与connection_connectAfter方法继承了FilterEventAdapter类，执行方法时输出日志

程序的连接池在application.properties中配置了5个，所以每次连接前连接后都会输出日志

代码如下：

package geektime.spring.data.druiddemo;

import com.alibaba.druid.filter.FilterChain;
import com.alibaba.druid.filter.FilterEventAdapter;
import com.alibaba.druid.proxy.jdbc.ConnectionProxy;
import lombok.extern.slf4j.Slf4j;

import java.util.Properties;

@Slf4j
public class ConnectionLogFilter extends FilterEventAdapter {
    
    

    @Override
    public void connection_connectBefore(FilterChain chain, Properties info) {
    
    
        log.info("BEFORE CONNECTION!");
    }

    @Override
    public void connection_connectAfter(ConnectionProxy connection) {
    
    
        log.info("AFTER CONNECTION!");
    }
}

package geektime.spring.data.druiddemo;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;

@SpringBootApplication
@Slf4j
public class DruidDemoApplication implements CommandLineRunner {
    
    
	@Autowired
	private DataSource dataSource;
	@Autowired
	private JdbcTemplate jdbcTemplate;

	public static void main(String[] args) {
    
    
		SpringApplication.run(DruidDemoApplication.class, args);
	}

	@Override
	public void run(String... args) throws Exception {
    
    
		log.info(dataSource.toString());
	}
}

特别注意使用AlibabaDruid，要在pom.xml中将spring-boot-starter-jdbc依赖的HikariCP排除

pom.xml

<?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 http://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>2.1.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>geektime.spring.data</groupId>
	<artifactId>druid-demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>druid-demo</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
			<exclusions>
				<exclusion>
					<artifactId>HikariCP</artifactId>
					<groupId>com.zaxxer</groupId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>

		<dependency>
			<groupId>com.h2database</groupId>
			<artifactId>h2</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.10</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

application.properties

spring.output.ansi.enabled=ALWAYS

spring.datasource.url=jdbc:h2:mem:foo
spring.datasource.username=sa
spring.datasource.password=n/z7PyA5cvcXvs8px8FVmBVpaRyNsvJb3X7YfS38DJrIg25EbZaZGvH4aHcnc97Om0islpCAPc3MqsGvsrxVJw==

spring.datasource.druid.initial-size=5
spring.datasource.druid.max-active=5
spring.datasource.druid.min-idle=5
spring.datasource.druid.filters=conn,config,stat,slf4j

spring.datasource.druid.connection-properties=config.decrypt=true;config.decrypt.key=${public-key}
spring.datasource.druid.filter.config.enabled=true

spring.datasource.druid.test-on-borrow=true
spring.datasource.druid.test-on-return=true
spring.datasource.druid.test-while-idle=true

public-key=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALS8ng1XvgHrdOgm4pxrnUdt3sXtu/E8My9KzX8sXlz+mXRZQCop7NVQLne25pXHtZoDYuMh3bzoGj6v5HvvAQ8CAwEAAQ==