SpringBoot集成阿里巴巴Druid监控

- 日理万妓 2022-05-27 05:25 271阅读 0赞

druid是阿里巴巴开源的数据库连接池，提供了优秀的对数据库操作的监控功能，本文要讲解一下springboot项目怎么集成druid。

本文在基于jpa的项目下开发，首先在pom文件中额外加入druid依赖，pom文件如下：

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.dalaoyang</groupId>
        <artifactId>springboot_druid</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>springboot_druid</name>
        <description>springboot_druid</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.12.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-jpa</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.0.28</version>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    
    </project>

application.properties上半段和整合jpa一点没变，下面加入了一些druid的配置，如果对druid的配置有什么不理解的，可以去网上查一下。（这篇文章我觉得写的很好，[传送门][Link 1]）

#端口号
    server.port=8888
    
    ##validate  加载hibernate时，验证创建数据库表结构
    ##create   每次加载hibernate，重新创建数据库表结构，这就是导致数据库表数据丢失的原因。
    ##create-drop        加载hibernate时创建，退出是删除表结构
    ##update                 加载hibernate自动更新数据库结构
    ##validate 启动时验证表的结构，不会创建表
    ##none  启动时不做任何操作
    spring.jpa.hibernate.ddl-auto=create
    
    ##控制台打印sql
    spring.jpa.show-sql=true
    
    ##数据库配置
    ##数据库地址
    spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false
    ##数据库用户名
    spring.datasource.username=root
    ##数据库密码
    spring.datasource.password=root
    ##数据库驱动
    spring.datasource.driver-class-name=com.mysql.jdbc.Driver
    
    
    #这里是不同的
    #使用druid的话 需要多配置一个属性spring.datasource.type
    spring.datasource.type=com.alibaba.druid.pool.DruidDataSource  
    
    
    # 连接池的配置信息
    # 初始化大小，最小，最大
    spring.datasource.initialSize=5  
    spring.datasource.minIdle=5  
    spring.datasource.maxActive=20  
    # 配置获取连接等待超时的时间
    spring.datasource.maxWait=60000  
    # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
    spring.datasource.timeBetweenEvictionRunsMillis=60000  
    # 配置一个连接在池中最小生存的时间，单位是毫秒
    spring.datasource.minEvictableIdleTimeMillis=300000  
    spring.datasource.validationQuery=SELECT 1 FROM DUAL  
    spring.datasource.testWhileIdle=true  
    spring.datasource.testOnBorrow=false  
    spring.datasource.testOnReturn=false  
    # 打开PSCache，并且指定每个连接上PSCache的大小
    spring.datasource.poolPreparedStatements=true  
    spring.datasource.maxPoolPreparedStatementPerConnectionSize=20  
    # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'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

然后在项目中加入DruidConfig，简单讲解一下，这个配置文件主要是加载application.properties的配置，代码如下：

package com.dalaoyang.config;
    
    import java.sql.SQLException;
    
    import javax.sql.DataSource;
    
    import org.apache.log4j.Logger;
    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 com.alibaba.druid.pool.DruidDataSource;
    /**
     * @author dalaoyang
     * @Description
     * @project springboot_learn
     * @package com.dalaoyang.config
     * @email yangyang@dalaoyang.cn
     * @date 2018/4/12
     */
    @Configuration
    public class DruidConfig {
        private Logger logger = Logger.getLogger(this.getClass());
    
        @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
        @Primary  //主数据源
        public DataSource dataSource(){
            DruidDataSource datasource = new DruidDataSource();
    
            datasource.setUrl(this.dbUrl);
            datasource.setUsername(username);
            datasource.setPassword(password);
            datasource.setDriverClassName(driverClassName);
    
            //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 {
                datasource.setFilters(filters);
            } catch (SQLException e) {
                logger.error("druid configuration Exception", e);
            }
            datasource.setConnectionProperties(connectionProperties);
    
            return datasource;
        }
    }

然后创建DruidFilter，代码如下：

package com.dalaoyang.filter;
    import javax.servlet.annotation.WebFilter;
    import javax.servlet.annotation.WebInitParam;
    
    import com.alibaba.druid.support.http.WebStatFilter;
    /**
     * @author dalaoyang
     * @Description
     * @project springboot_learn
     * @package com.dalaoyang.filter
     * @email yangyang@dalaoyang.cn
     * @date 2018/4/12
     */
    
    
    @WebFilter(filterName="druidWebStatFilter",urlPatterns="/*",
            initParams={
                    @WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")//忽略资源
            }
    )
    public class DruidFilter extends WebStatFilter  {
    }

新建DruidServlet，在类上面加注解@WebServlet，其中配置了登录druid监控页面的账号密码，白名单黑名单之类的配置，代码如下：

package com.dalaoyang.servlet;
    import javax.servlet.annotation.WebInitParam;
    import javax.servlet.annotation.WebServlet;
    
    import com.alibaba.druid.support.http.StatViewServlet;
    /**
     * @author dalaoyang
     * @Description
     * @project springboot_learn
     * @package com.dalaoyang.servlet
     * @email yangyang@dalaoyang.cn
     * @date 2018/4/12
     */
    
    
    @WebServlet(urlPatterns="/druid/*",
            initParams={
                    @WebInitParam(name="allow",value=""),// IP白名单(没有配置或者为空，则允许所有访问)
                    @WebInitParam(name="deny",value=""),// IP黑名单 (deny优先于allow)
                    @WebInitParam(name="loginUsername",value="admin"),// 登录druid管理页面用户名
                    @WebInitParam(name="loginPassword",value="admin")// 登录druid管理页面密码
            })
    public class DruidServlet extends StatViewServlet {
    
    }

然后在启动类加入注解@ServletComponentScan，让项目扫描到servlet，代码如下：

package com.dalaoyang;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    
    
    @SpringBootApplication
    // 启动类必须加入@ServletComponentScan注解，否则无法扫描到servlet
    @ServletComponentScan
    public class SpringbootDruidApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SpringbootDruidApplication.class, args);
        }
    }

剩余的就是和整合jpa一样的entity（实体类），repository（数据操作层），controller（测试使用的controller），直接展示代码。

City

package com.dalaoyang.entity;
    
    import javax.persistence.*;
    
    /**
     * @author dalaoyang
     * @Description
     * @project springboot_learn
     * @package com.dalaoyang.Entity
     * @email 397600342@qq.com
     * @date 2018/4/7
     */
    @Entity
    @Table(name="city")
    public class City {
    
        @Id
        @GeneratedValue(strategy=GenerationType.AUTO)
        private int cityId;
        private String cityName;
        private String cityIntroduce;
    
        public City(int cityId, String cityName, String cityIntroduce) {
            this.cityId = cityId;
            this.cityName = cityName;
            this.cityIntroduce = cityIntroduce;
        }
    
        public City(String cityName, String cityIntroduce) {
            this.cityName = cityName;
            this.cityIntroduce = cityIntroduce;
        }
    
        public City() {
        }
    
        public int getCityId() {
            return cityId;
        }
    
        public void setCityId(int cityId) {
            this.cityId = cityId;
        }
    
        public String getCityName() {
            return cityName;
        }
    
        public void setCityName(String cityName) {
            this.cityName = cityName;
        }
    
        public String getCityIntroduce() {
            return cityIntroduce;
        }
    
        public void setCityIntroduce(String cityIntroduce) {
            this.cityIntroduce = cityIntroduce;
        }
    }

CityRepository

package com.dalaoyang.repository;
    
    import com.dalaoyang.entity.City;
    import org.springframework.data.jpa.repository.JpaRepository;
    
    /**
     * @author dalaoyang
     * @Description
     * @project springboot_learn
     * @package com.dalaoyang.Repository
     * @email 397600342@qq.com
     * @date 2018/4/7
     */
    public interface CityRepository extends JpaRepository<City,Integer> {
    }

CityController

package com.dalaoyang.controller;
    
    import com.dalaoyang.entity.City;
    import com.dalaoyang.repository.CityRepository;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @author dalaoyang
     * @Description
     * @project springboot_learn
     * @package com.dalaoyang.controller
     * @email 397600342@qq.com
     * @date 2018/4/7
     */
    @RestController
    public class CityController {
    
    
        @Autowired
        private CityRepository cityRepository;
    
    
        //http://localhost:8888/saveCity?cityName=北京&cityIntroduce=中国首都
        @GetMapping(value = "saveCity")
        public String saveCity(String cityName,String cityIntroduce){
            City city = new City(cityName,cityIntroduce);
            cityRepository.save(city);
            return "success";
        }
    
        //http://localhost:8888/deleteCity?cityId=2
        @GetMapping(value = "deleteCity")
        public String deleteCity(int cityId){
            cityRepository.delete(cityId);
            return "success";
        }
    
        //http://localhost:8888/updateCity?cityId=3&cityName=沈阳&cityIntroduce=辽宁省省会
        @GetMapping(value = "updateCity")
        public String updateCity(int cityId,String cityName,String cityIntroduce){
            City city = new City(cityId,cityName,cityIntroduce);
            cityRepository.save(city);
            return "success";
        }
    
    
        //http://localhost:8888/getCityById?cityId=3
        @GetMapping(value = "getCityById")
        public City getCityById(int cityId){
            City city = cityRepository.findOne(cityId);
            return city;
        }
    }

然后启动项目，可以看到控制台已经创建了city表。

![1][]

然后访问http://localhost:8888/druid，可以看到如下图：

![2][]

输入账号密码admin，admin，如下图

![3][]

然后这时我们可以访问http://localhost:8888/saveCity?cityName=北京&cityIntroduce=中国首都

然后点击导航上面的SQL监控，如下图，

![4][]

从上图可以看到启动项目创建表的sql已经刚刚执行的sql。到这里整合已经完成了。

源码下载 ：[大老杨码云][Link 2]

个人网站：[https://dalaoyang.cn][https_dalaoyang.cn]

[Link 1]: https://blog.csdn.net/hj7jay/article/details/51686418
[1]: /images/20220527/32eab04504884fddacfe574fea3c9a61.png
[2]: /images/20220527/258b45687f9549c4be62106e65bccf4b.png
[3]: /images/20220527/4c66e8e740c24cebbf7178e5378ae57d.png
[4]: /images/20220527/b3a5cf1958e64b6c9a5ef97d429a4070.png
[Link 2]: https://gitee.com/dalaoyang/springboot_learn
[https_dalaoyang.cn]: https://dalaoyang.cn/