二、SpringBoot2核心功能--03数据访问--02在springboot中使用Druid数据源

1、在springboot中使用Druid数据源

1.1、druid官方github地址

https://github.com/alibaba/druid

1.2、整合第三方技术的两种方式

• 自定义
• 引入starter

1.3、整合第三方技术–自定义方式

<dependency>
    <groupId>com.alibabagroupId>
    <artifactId>druidartifactId>
    <version>1.1.17version>
dependency>

2、StatViewServlet
StatViewServlet的用途包括：
• 提供监控信息展示的html页面
• 提供监控信息的JSON API

  <servlet>
    <servlet-name>DruidStatViewservlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServletservlet-class>
  servlet>
  <servlet-mapping>
    <servlet-name>DruidStatViewservlet-name>
    <url-pattern>/druid/*url-pattern>
  servlet-mapping>

3、StatFilter
用于统计监控信息；如SQL监控、URI监控

需要给数据源中配置如下属性；可以允许多个filter，多个用，分割；如：
<property name="filters" value="stat,slf4j" />

系统中所有filter：

慢SQL记录配置

<bean id="stat-filter" class="com.alibaba.druid.filter.stat.StatFilter">
    <property name="slowSqlMillis" value="10000" />
    <property name="logSlowSql" value="true" />
bean>

使用 slowSqlMillis 定义慢SQL的时长

1.4、整合第三方技术–引入官方starter

1.4.1、引入druid-starter

<dependency>
    <groupId>com.alibabagroupId>
    <artifactId>druid-spring-boot-starterartifactId>
    <version>1.1.17version>
dependency>

1.4.2、

• 扩展配置项 spring.datasource.druid
• 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

    private static final String FILTER_STAT_PREFIX = "spring.datasource.druid.filter.stat";
    private static final String FILTER_CONFIG_PREFIX = "spring.datasource.druid.filter.config";
    private static final String FILTER_ENCODING_PREFIX = "spring.datasource.druid.filter.encoding";
    private static final String FILTER_SLF4J_PREFIX = "spring.datasource.druid.filter.slf4j";
    private static final String FILTER_LOG4J_PREFIX = "spring.datasource.druid.filter.log4j";
    private static final String FILTER_LOG4J2_PREFIX = "spring.datasource.druid.filter.log4j2";
    private static final String FILTER_COMMONS_LOG_PREFIX = "spring.datasource.druid.filter.commons-log";
    private static final String FILTER_WALL_PREFIX = "spring.datasource.druid.filter.wall";

1.4.3、配置示例

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

    druid:
      aop-patterns: com.study.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

SpringBoot配置示例：https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter

配置项列表：https://github.com/alibaba/druid/wiki/DruidDataSource%E9%85%8D%E7%BD%AE%E5%B1%9E%E6%80%A7%E5%88%97%E8%A1%A8