springboot 引入 druid 數據源監控

Druid是Java語言中最好的數據庫鏈接池。Druid可以提供強大的監控和擴展功能。Druid內置提供了一個StatViewServlet用於展現Druid的統計信息。css

 

第一步、引入依賴

<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<scope>runtime</scope>
</dependency>

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.1.5</version>
</dependency>

 

第二步、配置 application.properties 文件

#數據源配置
spring.datasource.url=jdbc:mysql://192.168.0.131:3306/hongone?useAffectedRows=true&serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#druid鏈接池
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
# 鏈接池的配置信息
# 初始化大小,最小,最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20

# 配置獲取鏈接等待超時的時間
spring.datasource.maxWait=30000
# 配置間隔多久才進行一次檢測,檢測須要關閉的空閒鏈接,單位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000

# 配置一個鏈接在池中最小生存的時間,單位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false

# 打開PSCache,而且指定每一個鏈接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置監控統計攔截的filters,去掉後監控界面sql沒法統計,'wall'用於防火牆
spring.datasource.filters=stat,wall
# 經過connectProperties屬性來打開mergeSql功能;慢SQL記錄
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=2000

注意 : 這裏的配置根據項目須要去進行自定義,好比 超時鏈接時間 、慢 sql 查詢時間 等html

 

第三步、數據源配置文件

package com.hone.system.utils.druid;

import com.alibaba.druid.pool.DruidDataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

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


@Configuration
public class DruidDBConfig{

    private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class);

    @Value("${spring.datasource.url}")
    private String dbUrl;

    @Value("${spring.datasource.username}")
    private String username;

    @Value("${spring.datasource.password}")
    private String password;

    @Value("${spring.datasource.driver-class-name}")
    private String driverClassName;

    @Value("${spring.datasource.initialSize}")
    private int initialSize;

    @Value("${spring.datasource.minIdle}")
    private int minIdle;

    @Value("${spring.datasource.maxActive}")
    private int maxActive;

    @Value("${spring.datasource.maxWait}")
    private int maxWait;

    @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")
    private int timeBetweenEvictionRunsMillis;

    @Value("${spring.datasource.minEvictableIdleTimeMillis}")
    private int minEvictableIdleTimeMillis;

    @Value("${spring.datasource.validationQuery}")
    private String validationQuery;

    @Value("${spring.datasource.testWhileIdle}")
    private boolean testWhileIdle;

    @Value("${spring.datasource.testOnBorrow}")
    private boolean testOnBorrow;

    @Value("${spring.datasource.testOnReturn}")
    private boolean testOnReturn;

    @Value("${spring.datasource.poolPreparedStatements}")
    private boolean poolPreparedStatements;

    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")
    private int maxPoolPreparedStatementPerConnectionSize;

    @Value("${spring.datasource.filters}")
    private String filters;

    @Value("{spring.datasource.connectionProperties}")
    private String connectionProperties;

    /**
     * @Bean 聲明,DataSource 對象爲 Spring 容器所管理;
     * @Primary 表示這裏定義的DataSource將覆蓋其餘來源的DataSource。
     * StatFilter,用於統計監控信息。StatFilter的別名是stat。
     * 統計SQL信息,合併統計。mergeStat是的MergeStatFilter縮寫。
     *     經過 DataSource 的屬性<property name="filters" value="mergeStat" /> 或者
     *                          connectProperties屬性來打開mergeSql功能 <property name="connectionProperties" value="druid.stat.mergeSql=true" />
     * StatFilter屬性slowSqlMillis用來配置SQL慢的標準
     *
     * @return
     */
    @Bean
    @Primary
    public DataSource dataSource() {
        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(dbUrl);
        datasource.setDriverClassName(driverClassName);
        datasource.setUsername(username);
        datasource.setPassword(password);

        //configuration
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setPoolPreparedStatements(poolPreparedStatements);
        datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
        try {
            /**
             * 設置StatFilter,用於統計監控信息。
             * StatFilter的別名是stat
             *
             */
            datasource.setFilters(filters);
        } catch (SQLException e) {
            logger.error("druid configuration initialization filter : {0}",e);
        }
        datasource.setConnectionProperties(connectionProperties);

        return datasource;
    }

}

 

第四步、經過註解的方式配置監控顯示頁面 Servlet

import com.alibaba.druid.support.http.StatViewServlet;

import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;

/**
 * StatViewServlet用於展現Druid的統計信息。
 * 提供監控信息展現的html頁面
 * 提供監控信息的JSON API
 *
 * 內置監控頁面的首頁是/druid/index.html
 *
 * loginUsername、loginPassword  登陸用戶名和密碼
 */

/**
 * @Webservlet
 * 有兩個屬性能夠用來表示Servlet的訪問路徑,分別是value和urlPatterns。value和urlPatterns都是數組形式,
 * 表示咱們能夠把一個Servlet映射到多個訪問路徑,可是value和urlPatterns不能同時使用。
 *
 */
@WebServlet(
        urlPatterns = {"/druid/*"},
        initParams = {
                @WebInitParam(name = "loginUsername", value = "admin"),
                @WebInitParam(name = "loginPassword", value = "admin"),
                @WebInitParam(name = "resetEnable", value = "false")
    }
)
public class DruidStatViewServlet extends StatViewServlet {
}

 

第五步、經過註解的方式配置採集Filter

import com.alibaba.druid.support.http.WebStatFilter;

import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

/**
 * WebStatFilter用於採集web-jdbc關聯監控的數據。
 * 屬性filterName聲明過濾器的名稱,可選
 * 屬性urlPatterns指定要過濾 的URL模式,也可以使用屬性value來聲明.(指定要過濾的URL模式是必選屬性)
 */

@WebFilter(
        urlPatterns = "/*",
        initParams = {
                @WebInitParam(name = "exclusions",value = "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*")
        }
)
public class DruidStatFilter extends WebStatFilter {
}

 

第六步、啓動類修改

@SpringBootApplication
@MapperScan("com.hone.dao") //開啓mapper掃描
@ServletComponentScan //開啓servlet掃描
public class HongoneApplication  {.....}

 

最後,啓動項目進行測試  在瀏覽器中輸入 http://localhost:8080/druid/index.htmljava

(注意: 若是你的項目設置了訪問前綴 , 訪問地址問  http://localhost:8080/訪問前綴/druid/index.html )mysql

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