SpringBoot系列记录（六）——druid连接池及监控配置

一、相关POM依赖

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

        <!-- mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
<!--            <version>5.1.47</version>-->
            <scope>runtime</scope>
        </dependency>
        <!-- mybatis-spring-boot-starter -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

二、properties文件对数据源信息配置

基本上每行都有注释，这里主要说一下

spring.datasource.filters 如果配置了log4j,那么依赖里一定要有log4j，我在另一个项目中使用的log4j2，那么我这里配置log4j2也是没问题的

server.port=8080

spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver
#spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/数据库名?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.username = root
spring.datasource.password = 1234

##########Druid连接池配置
# 初始化大小，最小，最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20

# 获取数据库连接等待的超时时间
spring.datasource.maxWait=60000

# 配置多久进行一次检测，检测需要关闭的空闲连接 单位毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000

#配置连接在池中的最小生存时间
spring.datasource.minEvictableIdleTimeMillis=300000

#系统启动时通过该sql语句验证数据库是否可用，如果不配置validationQuery，则下面三项无效
spring.datasource.validationQuery=SELECT 1 FROM DUAL
#启用空闲连接检测，以便回收
spring.datasource.testWhileIdle=true
#从连接池获取连接时，是否检测连接可用性，开启性能会有些许影响
spring.datasource.testOnBorrow=false
#释放连接到连接池时，是否检测连接可用性，开启性能会有些许影响
spring.datasource.testOnReturn=false

#PSCache对支持游标的数据库性能提升巨大，比如说oracle。在mysql下建议关闭。
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=false
spring.datasource.maxPoolPreparedStatementPerConnectionSize=0

#监控统计用的filter:stat日志用的filter:log4j防御sql注入的filter:wall  'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
#合并多个DruidDataSource的监控数据
#spring.datasource.useGlobalDataSourceStat=true

三、配置类DruidConfig

package com.example.demo.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;

/**
 * User: wangy
 * Date: 2020/4/2
 * Description: No Description
 */
@Configuration
public class DruidConfig {

    /**
     * 配置读取spring数据源
     */
    @Bean
    @ConfigurationProperties(prefix="spring.datasource")
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }

    /**
     * 配置Druid监控启动页面
     */
    @Bean
    public ServletRegistrationBean druidStartViewServlet(){
        //org.springframework.boot.context.embedded.ServletRegistrationBean提供类的进行注册.
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");

        //白名单：
        servletRegistrationBean.addInitParameter("allow","127.0.0.1");
        //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.
        //servletRegistrationBean.addInitParameter("deny","192.168.1.100");

        //登录查看信息的账号密码.
        //servletRegistrationBean.addInitParameter("loginUsername","admin");
        //servletRegistrationBean.addInitParameter("loginPassword","123456");

        //是否能够重置数据.
        servletRegistrationBean.addInitParameter("resetEnable","false");
        return servletRegistrationBean;
    }

    /**
     * Druid监控过滤器配置规则
     */
    @Bean
    public FilterRegistrationBean druidStartFilter(){
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());

        //添加过滤规则.
        filterRegistrationBean.addUrlPatterns("/*");

        //添加不需要忽略的格式信息.
        filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }
}

至此配置已经结束了，启动项目，测试也完美收官