1. Druid连接池的功能
2. 自定义版
- 2.1 pom.xml添加依赖
- 2.2 MyDataSourceConfig实现
- 2.3 application.properties配置
- 编写Controller进行测试
- 2.4 druid监控页面查看
3. starter版
- 3.1 pom.xml添加依赖
- 3.2 自动配置分析
- 3.3 使用application.properties对druid进行配置
- 3.4 druid配置参考

1. Druid连接池的功能

全方位监控、防SQL注入攻击等

2. 自定义版

2.1 pom.xml添加依赖

添加druid连接池的依赖，如下所示：

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.15</version>
        </dependency>

2.2 MyDataSourceConfig实现

说明如下：

@ConfigurationProperties(prefix = “spring.datasource”)注解，将以spring.datasource开头的配置和DataSource类进行绑定，就可以在application.properties对DataSource的属性进行设置了
druidDataSource.setFilters(“stat,wall”)：开启SQL监控、SQL防火墙功能
向IOC容器添加ServletRegistrationBean组件，开启druid监控功能。设置了druid监控的访问页面是/druid/*；也设置了登录监控页面的账号和密码
向IOC容器添加FilterRegistrationBean组件，开启Web应用菜单功能，让druid进行Web应用的统计。设置了统计的Web URL和排除的Web URL

package com.hh.springboottest.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.Arrays;

@Configuration
public class MyDataSourceConfig {

    // 将application.properties中spring.datasource前缀对应的值赋值给DataSource类属性
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource dataSource() {
        DruidDataSource druidDataSource = new DruidDataSource();

        try {
            // 开启SQL监控菜单功能，让druid进行SQL的执行统计
            // 开启SQL防火墙菜单功能
            druidDataSource.setFilters("stat,wall");

        } catch (SQLException e) {
            e.printStackTrace();
        }

        return druidDataSource;
    }

    // 向IOC容器添加ServletRegistrationBean组件，开启druid监控功能
    @Bean
    public ServletRegistrationBean statViewServlet() {
        StatViewServlet statViewServlet = new StatViewServlet();
        ServletRegistrationBean<StatViewServlet> servletRegistrationBean =
                // druid监控的访问页面是/druid/*
                new ServletRegistrationBean<>(statViewServlet, "/druid/*");

        // 开启监控页面的访问登录账号和密码
        servletRegistrationBean.addInitParameter("loginUsername", "druid");
        servletRegistrationBean.addInitParameter("loginPassword", "123456");

        return servletRegistrationBean;
    }

    // 开启Web应用菜单功能，让druid进行Web应用的统计
    @Bean
    public FilterRegistrationBean webStatFilter() {
        WebStatFilter webStatFilter = new WebStatFilter();

        FilterRegistrationBean<WebStatFilter> filterRegistrationBean =
                new FilterRegistrationBean<>(webStatFilter);
        // 设置统计的Web URL
        filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));
        // 设置排除的Web URL
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");

        return filterRegistrationBean;
    }

}

2.3 application.properties配置

在代码中可以对DataSource进行各种配置参数的set，也可以在application.properties中对durid连接池进行配置，如下所示：

# 最好注释HikariDataSource
# spring.datasource.type=com.zaxxer.hikari.HikariDataSource

spring.datasource.filters=stat,wall
spring.datasource.max-active=12

编写Controller进行测试

package com.hh.springboottest.myController;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;

@Slf4j
@RestController
public class HelloController {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Autowired
    DataSource dataSource;

    @ResponseBody
    @GetMapping("/queryFromDb")
    public String queryFromDb() {
        Long userCount = jdbcTemplate.queryForObject("select count(*) from user", Long.class);

        // 返回的结果是：数据库连接池类型为class com.alibaba.druid.pool.DruidDataSource
        log.info("数据库连接池类型为{}", dataSource.getClass());

        return userCount.toString();
    }

}

2.4 druid监控页面查看

访问http://localhost:8080/druid/index.html，页面效果如下：

druid监控页面其中数据源菜单在RestController等进行了调用才有结果显示

其中SQL监控页面如下。

SQL监控页面 SQL监控项上，执行时间、读取行数、更新行数都有区间分布，将耗时分布成8个区间：

耗时0到1毫秒的次数
耗时1到10毫秒的次数
耗时10到100毫秒的次数
耗时100到1000毫秒的次数
耗时1到10秒的次数
耗时10到100秒的次数
耗时100到1000秒的次数
耗时1000秒以上的次数

耗时区间分布提供了“执行+RS时分布”，是将执行时间+ResultSet持有时间合并监控，这个能方便诊断返回行数过多的查询

3. starter版

首先注释上面MyDataSourceConfig的@Configuration注解，或者删除MyDataSourceConfig.java文件。开始进行starter版的开发

3.1 pom.xml添加依赖

添加druid-spring-boot-starter的依赖；和添加spring-boot-starter-aop，用于druid监控页的Spring监控菜单。如下所示：

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.15</version>
        </dependency>

        <!-- 导入SprngBoot的aop的Starter，用于druid监控页的Spring监控菜单 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

可以看到自动添加了druid、spring-boot-autoconfiguration依赖
druid-spring-boot-starter

3.2 自动配置分析

查看druid-spring-boot-starter-1.2.15.jar的DruidDataSourceAutoConfigure.class，可以看到：

DruidDataSourceAutoConfigure是在DataSourceAutoConfiguration之前添加到IOC容器的，这样就先使用了druid连接池
同时对DruidStatProperties、DataSourceProperties两个配置类进行了绑定
向IOC容器添加了DruidSpringAopConfiguration、DruidStatViewServletConfiguration、DruidWebStatFilterConfiguration.class、DruidFilterConfiguration四个组件
向IOC容器添加了DataSource

package com.alibaba.druid.spring.boot.autoconfigure;
......省略部分......
@Configuration
@ConditionalOnClass({DruidDataSource.class})
@AutoConfigureBefore({DataSourceAutoConfiguration.class})
@EnableConfigurationProperties({DruidStatProperties.class, DataSourceProperties.class})
@Import({DruidSpringAopConfiguration.class, DruidStatViewServletConfiguration.class, DruidWebStatFilterConfiguration.class, DruidFilterConfiguration.class})
public class DruidDataSourceAutoConfigure {
......省略部分......
@Bean(
        initMethod = "init"
    )
    @ConditionalOnMissingBean
    public DataSource dataSource() {
        LOGGER.info("Init DruidDataSource");
        return new DruidDataSourceWrapper();
    }
}

查看DruidStatProperties配置类，druid的配置是由spring.datasource.druid开头的参数进行配置的

......省略部分......
@ConfigurationProperties("spring.datasource.druid")
public class DruidStatProperties {
......省略部分......
}

查看DataSourceProperties配置类，datasource的配置是由spring.datasource开头的参数进行配置的

......省略部分......
@ConfigurationProperties(
    prefix = "spring.datasource"
)
public class DataSourceProperties implements BeanClassLoaderAware, InitializingBean {
......省略部分......
}

查看DruidSpringAopConfiguration类，aop相关的是由spring.datasource.druid.aop-patterns参数进行配置的，主要用来监控SpringBean。对应druid监控页面的Spring监控菜单

......省略部分......
@ConditionalOnProperty({"spring.datasource.druid.aop-patterns"})
public class DruidSpringAopConfiguration {
......省略部分......
}

查看DruidStatViewServletConfiguration类，如下所示：

statViewServlet相关的是由spring.datasource.druid.stat-view-servlet.enabled参数进行配置的，默认关闭
向IOC容器添加了ServletRegistrationBean组件
该类主要做了允许哪些IP可以访问监控页面，不允许哪些页面访问监控页面
和设置监控页面的登录账号和密码
和设置重置按钮的开启和关闭

......省略部分......
@ConditionalOnWebApplication
@ConditionalOnProperty(
    name = {"spring.datasource.druid.stat-view-servlet.enabled"},
    havingValue = "true"
)
public class DruidStatViewServletConfiguration {
    private static final String DEFAULT_ALLOW_IP = "127.0.0.1";

    public DruidStatViewServletConfiguration() {
    }

    @Bean
    public ServletRegistrationBean statViewServletRegistrationBean(DruidStatProperties properties) {
        DruidStatProperties.StatViewServlet config = properties.getStatViewServlet();
        ServletRegistrationBean registrationBean = new ServletRegistrationBean();
        registrationBean.setServlet(new StatViewServlet());
        registrationBean.addUrlMappings(new String[]{config.getUrlPattern() != null ? config.getUrlPattern() : "/druid/*"});
        if (config.getAllow() != null) {
            registrationBean.addInitParameter("allow", config.getAllow());
        } else {
            registrationBean.addInitParameter("allow", "127.0.0.1");
        }

        if (config.getDeny() != null) {
            registrationBean.addInitParameter("deny", config.getDeny());
        }

        if (config.getLoginUsername() != null) {
            registrationBean.addInitParameter("loginUsername", config.getLoginUsername());
        }

        if (config.getLoginPassword() != null) {
            registrationBean.addInitParameter("loginPassword", config.getLoginPassword());
        }

        if (config.getResetEnable() != null) {
            registrationBean.addInitParameter("resetEnable", config.getResetEnable());
        }

        return registrationBean;
    }
}

查看DruidWebStatFilterConfiguration类，如下所示：

WebStatFilter相关的是由spring.datasource.druid.web-stat-filter.enabled参数进行配置的，默认关闭
向IOC容器添加了FilterRegistrationBean组件
该类设置了对哪些Web URL进行统计，哪些Web URL不进行统计(比如: “.js,.gif,.jpg,.png,.css,.ico,/druid/*”)

......省略部分......
@ConditionalOnWebApplication
@ConditionalOnProperty(
    name = {"spring.datasource.druid.web-stat-filter.enabled"},
    havingValue = "true"
)
public class DruidWebStatFilterConfiguration {
    public DruidWebStatFilterConfiguration() {
    }

    @Bean
    public FilterRegistrationBean webStatFilterRegistrationBean(DruidStatProperties properties) {
        DruidStatProperties.WebStatFilter config = properties.getWebStatFilter();
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        WebStatFilter filter = new WebStatFilter();
        registrationBean.setFilter(filter);
        registrationBean.addUrlPatterns(new String[]{config.getUrlPattern() != null ? config.getUrlPattern() : "/*"});
        registrationBean.addInitParameter("exclusions", config.getExclusions() != null ? config.getExclusions() : "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        ......省略部分......
    }
......省略部分......
}

查看DruidFilterConfiguration类，是对所有Druid自己的Filter的配置，比如wall防火墙

......省略部分......
public class DruidFilterConfiguration {
    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";
    private static final String FILTER_WALL_CONFIG_PREFIX = "spring.datasource.druid.filter.wall.config";
    ......省略部分......
}

3.3 使用application.properties对druid进行配置

druid的配置如下所示：

# 配置druid监控功能
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.login-username=druid
spring.datasource.druid.stat-view-servlet.login-password=123456
spring.datasource.druid.stat-view-servlet.reset-enable=false

# 开启druid监控页面的sql监控菜单、防火墙菜单
spring.datasource.druid.filters=stat,wall,slf4j

# 对filters里面的stat的详细配置
spring.datasource.druid.filter.stat.enabled=true
spring.datasource.druid.filter.stat.log-slow-sql=true
# 1秒
spring.datasource.druid.filter.stat.slow-sql-millis=1000

# 对filters里面的wall的详细配置
spring.datasource.druid.filter.wall.enabled=true
spring.datasource.druid.filter.wall.config.update-allow=true
spring.datasource.druid.filter.wall.config.drop-table-allow=false

# 配置Web应用菜单功能
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions=*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*

# 监控指定路径下的SpringBean。用于Spring监控菜单
spring.datasource.druid.aop-patterns=com.hh.springboottest.*

3.4 druid配置参考

连接池配置

spring.datasource.druid.initial-size=
spring.datasource.druid.max-active=
spring.datasource.druid.min-idle=
spring.datasource.druid.max-wait=
spring.datasource.druid.pool-prepared-statements=
spring.datasource.druid.max-pool-prepared-statement-per-connection-size= 
# 和上面的等价
spring.datasource.druid.max-open-prepared-statements=
spring.datasource.druid.validation-query=
spring.datasource.druid.validation-query-timeout=
spring.datasource.druid.test-on-borrow=
spring.datasource.druid.test-on-return=
spring.datasource.druid.test-while-idle=
spring.datasource.druid.time-between-eviction-runs-millis=
spring.datasource.druid.min-evictable-idle-time-millis=
spring.datasource.druid.max-evictable-idle-time-millis=
# 配置多个英文逗号分隔
spring.datasource.druid.filters=

监控配置

 # WebStatFilter配置，说明请参考Druid Wiki，配置_配置WebStatFilter
 # 是否启用StatFilter，默认值false
spring.datasource.druid.web-stat-filter.enabled=
spring.datasource.druid.web-stat-filter.url-pattern=
spring.datasource.druid.web-stat-filter.exclusions=
spring.datasource.druid.web-stat-filter.session-stat-enable=
spring.datasource.druid.web-stat-filter.session-stat-max-count=
spring.datasource.druid.web-stat-filter.principal-session-name=
spring.datasource.druid.web-stat-filter.principal-cookie-name=
spring.datasource.druid.web-stat-filter.profile-enable=

 # StatViewServlet配置，说明请参考Druid Wiki，配置_StatViewServlet配置
 # 是否启用StatViewServlet(监控页面)，默认值为false(考虑到安全问题默认并未启动，如需启用建议设置密码或白名单以保障安全)
spring.datasource.druid.stat-view-servlet.enabled=
spring.datasource.druid.stat-view-servlet.url-pattern=
spring.datasource.druid.stat-view-servlet.reset-enable=
spring.datasource.druid.stat-view-servlet.login-username=
spring.datasource.druid.stat-view-servlet.login-password=
spring.datasource.druid.stat-view-servlet.allow=
spring.datasource.druid.stat-view-servlet.deny=

 # Spring监控配置，说明请参考Druid Github Wiki，配置_Druid和Spring关联监控配置
 # Spring监控AOP切入点，如x.y.z.service.*, 配置多个英文逗号分隔
spring.datasource.druid.aop-patterns=