26.数据源配置和自动管理

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项目工程一：

项目依赖

pom.xml

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<?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>2.7.0</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>12_springboot_datasource</artifactId>
	<version>1.0</version>
	<name>12_springboot_datasource</name>
	<description>Spring Boot data source</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-configuration-processor</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		
		<!-- 引入JDBC和MySQL的依赖 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		
		<!-- 引入dbcp2依赖 -->
		<dependency>
		    <groupId>org.apache.commons</groupId>
		    <artifactId>commons-dbcp2</artifactId>
		</dependency>
		
		<!-- durid -->
		<dependency>
		    <groupId>com.alibaba</groupId>
		    <artifactId>druid</artifactId>
		    <version>1.2.10</version>
		</dependency>
		
		
	</dependencies>

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

</project>

1.SpringBoot默认使用的数据源【HikariDataSource】

application.yml

不需要指定spring.datasource.type

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# 数据源配置信息
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/demo_filesystem
    username: root
    password: 123456

测试类

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package com.example.demo;

import javax.sql.DataSource;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class ApplicationTests {

	@Autowired
	private DataSource dataSource;
	
	@Test
	void contextLoads() {
		System.out.println("dataSource = " + dataSource);
		// dataSource = HikariDataSource (null)
	}
}

2.Spring自带的数据源【DriverManagerDataSource】

application.yml

指定spring.datasource.type=DriverManagerDataSource

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# 数据源配置信息
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/demo_filesystem
    username: root
    password: 123456
    # 指定数据源的类型
    type: org.springframework.jdbc.datasource.DriverManagerDataSource

测试类

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package com.example.demo;

import javax.sql.DataSource;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class ApplicationTests {

	@Autowired
	private DataSource dataSource;
	
	@Test
	void contextLoads() {
		System.out.println("dataSource = " + dataSource);
		// dataSource = org.springframework.jdbc.datasource.DriverManagerDataSource@97d0c06		
	}
}

3.SpringBoot使用dbcp2数据源

application.yml

指定spring.datasource.type=dbcp2

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# 数据源配置信息
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/demo_filesystem
    username: root
    password: 123456
    # 指定数据源的类型
    type: org.apache.commons.dbcp2.BasicDataSource

测试类

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package com.example.demo;

import javax.sql.DataSource;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class ApplicationTests {

	@Autowired
	private DataSource dataSource;
	
	@Test
	void contextLoads() {
		System.out.println("dataSource = " + dataSource);
		// dataSource = org.apache.commons.dbcp2.BasicDataSource@d5d5353
	}
}

4.SpringBoot使用druid数据源(自定义starter)，并配置监控页面

创建自定义druid配置类

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package com.example.demo.config;

import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;

@Configuration
@ConditionalOnClass(value = {DruidDataSource.class})
public class DruidAutoConfiguration {

	@Bean(initMethod = "init")
	@ConfigurationProperties(prefix = "druid.datasource")
	public DruidDataSource druidDataSource() {
		DruidDataSource druidDataSource = new DruidDataSource();
		return druidDataSource;
	}

    /* --------------- 以下为配置监控页面 --------------- */
	
	private String urlMappings = "/druid/*";
	
	private String loginUsername = "admin";
	private String loginPassword ="123456";
	
	private String allow ="";
	private String deny ="";
	
	/*
	 * allow和deny填写ip地址
	 * ip地址之间用,分隔，不能加空格
     * localhost作为ip地址不合法
	 * 请求访问的url写localhost，该请求不会被拦截，一直有效
	 */
	// private String allow ="127.0.0.1, 192.168.33.10, 192.168.22.130";
	// private String deny ="localhost";
	
	// 2022-06-09 22:50:33.034 ERROR 14136 --- [nio-8080-exec-1] c.a.druid.support.http.ResourceServlet   : initParameter config error, allow : 127.0.0.1, 192.168.33.10, 192.168.22.130

	// java.lang.IllegalArgumentException: Invalid IP Address [ 192.168.33.10]
	// 	at com.alibaba.druid.support.http.util.IPAddress.parseIPAddress(IPAddress.java:169) ~[druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.util.IPAddress.<init>(IPAddress.java:30) ~[druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.util.IPRange.parseRange(IPRange.java:100) ~[druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.util.IPRange.<init>(IPRange.java:41) ~[druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.ResourceServlet.initAuthEnv(ResourceServlet.java:84) [druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.ResourceServlet.init(ResourceServlet.java:54) [druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.StatViewServlet.init(StatViewServlet.java:67) [druid-1.2.10.jar:1.2.10]
	// 	at javax.servlet.GenericServlet.init(GenericServlet.java:158) [tomcat-embed-core-9.0.63.jar:4.0.FR]
	// 	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1164) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:804) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:128) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_271]
	// Caused by: java.lang.NumberFormatException: For input string: " 192"
	// 	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[na:1.8.0_271]
	// 	at java.lang.Integer.parseInt(Integer.java:569) ~[na:1.8.0_271]
	// 	at java.lang.Integer.parseInt(Integer.java:615) ~[na:1.8.0_271]
	// 	at com.alibaba.druid.support.http.util.IPAddress.parseIPAddress(IPAddress.java:141) ~[druid-1.2.10.jar:1.2.10]
	// 	... 25 common frames omitted

	// 2022-06-09 22:50:33.035 ERROR 14136 --- [nio-8080-exec-1] c.a.druid.support.http.ResourceServlet   : initParameter config error, deny : localhost

	// java.lang.IllegalArgumentException: Invalid IP Address [localhost]
	// 	at com.alibaba.druid.support.http.util.IPAddress.parseIPAddress(IPAddress.java:150) ~[druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.util.IPAddress.<init>(IPAddress.java:30) ~[druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.util.IPRange.parseRange(IPRange.java:100) ~[druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.util.IPRange.<init>(IPRange.java:41) ~[druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.ResourceServlet.initAuthEnv(ResourceServlet.java:104) [druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.ResourceServlet.init(ResourceServlet.java:54) [druid-1.2.10.jar:1.2.10]
	// 	at com.alibaba.druid.support.http.StatViewServlet.init(StatViewServlet.java:67) [druid-1.2.10.jar:1.2.10]
	// 	at javax.servlet.GenericServlet.init(GenericServlet.java:158) [tomcat-embed-core-9.0.63.jar:4.0.FR]
	// 	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1164) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:804) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:128) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.63.jar:9.0.63]
	// 	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_271]

	
	/*
	 * 配置监控页面
	 */
	@Bean
	public ServletRegistrationBean<StatViewServlet> servletRegistrationBeanStatViewServlet() {
		// 创建servlet
		StatViewServlet statViewServlet = new StatViewServlet();
		// 创建ServletRegistrationBean
		ServletRegistrationBean<StatViewServlet> servletRegistrationBean = new ServletRegistrationBean<>();
		// 注入servlet
		servletRegistrationBean.setServlet(statViewServlet);
		// 注入url
		servletRegistrationBean.addUrlMappings(urlMappings);
		// 注入属性
		servletRegistrationBean.addInitParameter("loginUsername", loginUsername);
		servletRegistrationBean.addInitParameter("loginPassword", loginPassword);
		servletRegistrationBean.addInitParameter("allow", allow);
		servletRegistrationBean.addInitParameter("deny", deny);
		
		return servletRegistrationBean;
	}	
}

application.yml

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# druid数据源配置
druid:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/demo_filesystem
    username: root
    password: 123456
    
    initial-size: 3
    min-idle: 5
    max-active: 100
    max-wait: 10
    validation-query: select 'x'

测试类

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package com.example.demo;

import javax.sql.DataSource;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class ApplicationTests {

	@Autowired
	private DataSource dataSource;
	
	@Test
	void contextLoads() {
		System.out.println("dataSource = " + dataSource);		
		/*
            dataSource = {
                CreateTime:"2022-06-12 22:56:16",
                ActiveCount:0,
                PoolingCount:3,
                CreateCount:3,
                DestroyCount:0,
                CloseCount:0,
                ConnectCount:0,
                Connections:[
                    {ID:591247593, ConnectTime:"2022-06-12 22:56:17", UseCount:0, LastActiveTime:"2022-06-12 22:56:17"},
                    {ID:1086508626, ConnectTime:"2022-06-12 22:56:17", UseCount:0, LastActiveTime:"2022-06-12 22:56:17"},
                    {ID:1614238, ConnectTime:"2022-06-12 22:56:17", UseCount:0, LastActiveTime:"2022-06-12 22:56:17"}
                ]
            }
            2022-06-12 22:56:18.342  INFO 13420 --- [ionShutdownHook] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closing ...
            2022-06-12 22:56:18.346  INFO 13420 --- [ionShutdownHook] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closed
		 */	
	}
}

访问监控页面

1.运行Application.java启动类

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package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

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

}

2.浏览器访问: http://127.0.0.1:8080/druid/

5.SpringBoot使用druid数据源(引入官方starter)，并配置监控页面

项目工程二：

项目依赖：

pom.xml

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<?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>2.7.0</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>13_springboot_druid</artifactId>
	<version>1.0</version>
	<name>13_springboot_druid</name>
	<description>Spring Boot druid</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-configuration-processor</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		
		<!-- druid-spring-boot-starter -->
		<dependency>
		    <groupId>com.alibaba</groupId>
		    <artifactId>druid-spring-boot-starter</artifactId>
		    <version>1.2.9</version>
		</dependency>
		
	</dependencies>

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

</project>

application.yml

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# 数据源配置信息
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/demo_filesystem
      username: root
      password: 123456
      initial-size: 3
      min-idle: 2
      max-active: 10
      max-wait: 15000
      
      stat-view-servlet:
        login-username: admin
        login-password: 123456
        # allow和deny可以为空
        allow: 192.168.10.25,127.0.0.1,192.168.30.23,192.168.5.26
        deny: 
        url-pattern: /druid/*
        # 默认为false，不开启        
        enabled: true

访问监控页面

1.运行Application.java启动类

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package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

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

}

2.浏览器访问: http://127.0.0.1:8080/druid/