一. 什麼是Druid

    Druid是阿里巴巴開源的高效能，多功能的連線池

    Druid是Java語言中最好的資料庫連線池，是阿里巴巴的開源專案。Druid是阿里巴巴開發的號稱為監控而生的資料庫連線池，在功能、效能、擴充套件性方面，都超過其他資料庫連線池，包括DBCP、C3P0、BoneCP、Proxool、JBoss DataSource等等等。

二. Spring Boot整合Druid實現資料監控

匯入Maven相關依賴

        <!-- druid依賴 -->
        <dependency>    
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.9</version><!--1.1.0版本衝突-->
        </dependency>
 

或者直接匯入Druid依賴

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.9</version>
        </dependency>

配置application.properties

配置jdbc屬性

# 配置jdbc屬性
spring.datasource.druid.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.druid.username=root
spring.datasource.druid.password=root
 

配置Druid資料來源（連線池）

# 配置資料來源
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.initial-size=5
spring.datasource.druid.max-active=100
spring.datasource.druid.min-idle=5
spring.datasource.druid.max-wait=60000
spring.datasource.druid.pool-prepared-statements=true
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20
spring.datasource.druid.validation-query=SELECT 1 FROM DUAL
spring.datasource.druid.validation-query-timeout=60000
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
spring.datasource.druid.test-while-idle=true
spring.datasource.druid.time-between-eviction-runs-millis=60000
spring.datasource.druid.min-evictable-idle-time-millis=100000
 

新增 DruidDataSourceConfig 配置類

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
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 com.alibaba.druid.support.http.StatViewServlet;

import javax.sql.DataSource;

@Configuration
@ConditionalOnClass(com.alibaba.druid.pool.DruidDataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "com.alibaba.druid.pool.DruidDataSource", matchIfMissing = true)
public class DruidDataSourceConfig {

    /**
     * @return DruidDataSource
     * @see
     */
    @Bean
    @ConfigurationProperties("spring.datasource.druid")
    public DataSource dataSourceOne() {
        return DruidDataSourceBuilder.create().build();
    }



}

新增Druid監控屬性配置

# WebStatFilter配置，說明請參考Druid Wiki，配置_配置WebStatFilter
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/*
# StatViewServlet配置，說明請參考Druid Wiki，配置_StatViewServlet配置
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
spring.datasource.druid.stat-view-servlet.reset-enable=false
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=admin
spring.datasource.druid.stat-view-servlet.allow=127.0.0.1
#訪問黑名單
spring.datasource.druid.stat-view-servlet.deny=127.0.0.1

新增Druid過濾屬性配置

# 配置StatFilter
spring.datasource.druid.filter.stat.db-type=mysql
spring.datasource.druid.filter.stat.log-slow-sql=true
spring.datasource.druid.filter.stat.slow-sql-millis=5000
# 配置WallFilter
spring.datasource.druid.filter.wall.enabled=true
spring.datasource.druid.filter.wall.db-type=mysql
spring.datasource.druid.filter.wall.config.delete-allow=false
spring.datasource.druid.filter.wall.config.drop-table-allow=false

啟動主程式類進行測試：

進行登入檢視監控資料：

如果上述配置屬性檔案不可行，還可配置如下java類進行監控資料

刪除application.properties中監控以及過濾屬性配置

在 DruidDataSourceConfig 類中加如下程式碼：

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
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 com.alibaba.druid.support.http.StatViewServlet;

import javax.sql.DataSource;

@Configuration
@ConditionalOnClass(com.alibaba.druid.pool.DruidDataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "com.alibaba.druid.pool.DruidDataSource", matchIfMissing = true)
public class DruidDataSourceConfig {

    /**
     * @return DruidDataSource
     * @see
     */
    @Bean
    @ConfigurationProperties("spring.datasource.druid")
    public DataSource dataSourceOne() {
        return DruidDataSourceBuilder.create().build();
    }


    @Bean
    public ServletRegistrationBean druidStatViewServlet(){
        //org.springframework.boot.context.embedded.ServletRegistrationBean提供類的進行註冊.
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
        //新增初始化引數：initParams
        //白名單：
        servletRegistrationBean.addInitParameter("allow","127.0.0.1");
        //IP黑名單 (存在共同時，deny優先於allow) : 如果滿足deny的話提示:Sorry, you are not permitted to view this page.
        servletRegistrationBean.addInitParameter("deny","127.0.0.1");
        //登入檢視資訊的賬號密碼.
        servletRegistrationBean.addInitParameter("loginUsername","admin");
        servletRegistrationBean.addInitParameter("loginPassword","admin");
        //是否能夠重置資料.
        servletRegistrationBean.addInitParameter("resetEnable","false");
        return servletRegistrationBean;
    }

    
    @Bean
    public FilterRegistrationBean druidStatFilter(){
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        //新增過濾規則.
        filterRegistrationBean.addUrlPatterns("/*");
        //新增不需要忽略的格式資訊.
        filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }



}

Druid 主要配置引數如下：