SpringBoot-数据访问之Druid

Druid数据源

官方地址

GitHub：https://github.com/alibaba/druid
中文文档：常见问题 · alibaba/druid Wiki · GitHub
springboot的使用：druid/druid-spring-boot-starter at master · alibaba/druid · GitHub

导入依赖

Spring Boot 2.5.2版本导入下面的druid 1.1.17依赖并不能使用监控功能
使用相同版本的druid-spring-boot-starter可以使用监控功能。

XML 复制代码

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.1.17</version>
</dependency>

XML方式配置数据源

XML 复制代码

<bean id="dataSource" 
		class="com.alibaba.druid.pool.DruidDataSource"
		destroy-method="close">
	<property name="url" value="${jdbc.url}" />
	<property name="username" value="${jdbc.username}" />
	<property name="password" value="${jdbc.password}" />
	<property name="maxActive" value="20" />
	<property name="initialSize" value="1" />
	<property name="maxWait" value="60000" />
	<property name="minIdle" value="1" />
	<property name="timeBetweenEvictionRunsMillis" value="60000" />
	<property name="minEvictableIdleTimeMillis" value="300000" />
	<property name="testWhileIdle" value="true" />
	<property name="testOnBorrow" value="false" />
	<property name="testOnReturn" value="false" />
	<property name="poolPreparedStatements" value="true" />
	<property name="maxOpenPreparedStatements" value="20" />
</bean>

配置类方式配置数据源

java 复制代码

//默认的自动配置是判断容器中没有才会配@ConditionalOnMissingBean(DataSource.class)
@ConfigurationProperties("spring.datasource")
@Bean
public DataSource dataSource() throws SQLException {
	DruidDataSource druidDataSource = new DruidDataSource();

    //要么ConfigurationProperties配置文件配置，要么手动set
	//druidDataSource.setUrl();
	//druidDataSource.setUsername();
	//druidDataSource.setPassword();

    //wall是加入监控防火墙
    //stat是加入监控统计功能
    //多个值用","分割
	druidDataSource.setFilters("stat,wall");
	druidDataSource.setMaxActive(10);
	return druidDataSource;
}

StatViewServlet的用途

内置监控页面的首页是**/druid/index.html**
提供监控信息展示的html页面
提供监控信息的JSON API

java 复制代码

//配置 druid的监控页功能
@Bean
public ServletRegistrationBean statViewServlet(){
	StatViewServlet statViewServlet = new StatViewServlet();
	ServletRegistrationBean<StatViewServlet> registrationBean =
			new ServletRegistrationBean<>(statViewServlet, "/druid/*");

    //监控页登录用户
	registrationBean.addInitParameter("loginUsername","admin");
	registrationBean.addInitParameter("loginPassword","123456");
	return registrationBean;
}

StatFilter

用于统计监控信息；如SQL监控、URI监控
系统中所有filter

|---------------|---------------------------------------------------------|
| 别名 | Filter类名 |
| default | com.alibaba.druid.filter.stat.StatFilter |
| stat | com.alibaba.druid.filter.stat.StatFilter |
| mergeStat | com.alibaba.druid.filter.stat.MergeStatFilter |
| encoding | com.alibaba.druid.filter.encoding.EncodingConvertFilter |
| log4j | com.alibaba.druid.filter.logging.Log4jFilter |
| log4j2 | com.alibaba.druid.filter.logging.Log4j2Filter |
| slf4j | com.alibaba.druid.filter.logging.Slf4jLogFilter |
| commonlogging | com.alibaba.druid.filter.logging.CommonsLogFilter |

java 复制代码

//WebStatFilter 用于采集web-jdbc关联监控的数据。
@Bean
public FilterRegistrationBean webStatFilter(){
	WebStatFilter webStatFilter = new WebStatFilter();

	FilterRegistrationBean<WebStatFilter> filterRegistrationBean =
			new FilterRegistrationBean<>(webStatFilter);
	//过滤所有
	filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));
	//排除过滤的路径
	filterRegistrationBean.addInitParameter(
			"exclusions",
			"*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");

	return filterRegistrationBean;
}

Druid-starter自动配置原理

引入starter依赖

XML 复制代码

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid-spring-boot-starter</artifactId>
	<version>1.1.17</version>
</dependency>

DruidDataSourceAutoConfigure

配置文件配置 spring.datasource.druid 或 spring.datasource
需要配置在springboot官方数据源之前，也就是在spring-boot-starter-data-jdbc之前引入依赖

DruidSpringAopConfiguration.class

监控SpringBean的
配置项：spring.datasource.druid.aop-patterns

DruidStatViewServletConfiguration.class

监控页的配置：spring.datasource.druid.stat-view-servlet；默认开启

DruidWebStatFilterConfiguration.class

web监控配置；spring.datasource.druid.web-stat-filter；默认开启

DruidFilterConfiguration.class

所有Druid自己filter的配置

配置文件示例

bash 复制代码

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/db_account
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver

    druid:
      aop-patterns: com.my.admin.*  #监控SpringBean
      filters: stat,wall     # 底层开启功能，stat（sql监控），wall（防火墙）

      stat-view-servlet:   # 配置监控页功能
        enabled: true
        login-username: admin
        login-password: admin
        resetEnable: false

      web-stat-filter:  # 监控web
        enabled: true
        urlPattern: /*
        exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'


      filter:
        stat:    # 对上面filters里面的stat的详细配置
          slow-sql-millis: 1000
          logSlowSql: true
          enabled: true
        wall:
          enabled: true
          config:
            drop-table-allow: false