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/> <!-- lookup parent from repository --> </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）
#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sqlspring.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.typespring.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 [email protected] * @date 2018/4/12 */@Configurationpublic 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 [email protected] * @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 [email protected] * @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@ServletComponentScanpublic 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 [email protected] * @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 [email protected] * @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 [email protected] * @date 2018/4/7 */@RestControllerpublic 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。
然后访问http://localhost:8888/druid，可以看到如下图：
输入账号密码admin，admin，如下图
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，
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 ：https://gitee.com/dalaoyang/springboot_learn
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。