SpringBoot精通系列-开发案例之配置Druid数据库连接池

导语
在使用SpringBoot的时候默认情况下提供了若干的数据库连接池，例如(dbcp,dbcp2,tomcat,hikari)等等，当然并不支持我们接下来所说的Druid，Druid是来自与阿里系的一个开源连接池，提供了非常优秀的监控功能。下面就来一起探索一下关于SpringBoot整合Druid的方式。

版本环境

Spring Boot 2.1.6，Druid 1.1.10，JDK1.8

Pom文件

这里提供一个由阿里巴巴提供的SpringBoot关于Druid的整合方式

https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter

 <dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--数据库连接池配置--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency>

配置文件

spring:datasource:url: jdbc:mysql://192.168.1.66:3306/spring-boot?useUnicode=true&characterEncoding=utf-8&useSSL=falseusername: rootpassword: rootdriver-class-name: com.mysql.jdbc.Driverplatform: mysqltype: com.alibaba.druid.pool.DruidDataSource# 下面为连接池的补充设置，应用到上面所有数据源中# 初始化大小，最小，最大initialSize: 1minIdle: 3maxActive: 20# 配置获取连接等待超时的时间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timeBetweenEvictionRunsMillis: 60000# 配置一个连接在池中最小生存的时间，单位是毫秒minEvictableIdleTimeMillis: 30000validationQuery: select 'x'testWhileIdle: truetestOnBorrow: falsetestOnReturn: false# 打开PSCache，并且指定每个连接上PSCache的大小poolPreparedStatements: truemaxPoolPreparedStatementPerConnectionSize: 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filters: stat,wall,slf4j# 通过connectProperties属性来打开mergeSql功能；慢SQL记录connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

编写配置类

package com.nh.haiyan.ordermanager.config;import java.sql.SQLException;
import javax.sql.DataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;/*** nihui*/
@Configuration
public class DruidConfiguration {private static final Logger logger = LoggerFactory.getLogger(DruidConfiguration.class);private static final String DB_PREFIX = "spring.datasource";@Beanpublic ServletRegistrationBean druidServlet() {logger.info("init Druid Servlet Configuration ");ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");// IP白名单 (没有配置或者为空，则允许所有访问)servletRegistrationBean.addInitParameter("allow", "");// IP黑名单(共同存在时，deny优先于allow)//servletRegistrationBean.addInitParameter("deny", "192.168.1.100");//控制台管理用户servletRegistrationBean.addInitParameter("loginUsername", "admin");servletRegistrationBean.addInitParameter("loginPassword", "admin");//是否能够重置数据 禁用HTML页面上的“Reset All”功能servletRegistrationBean.addInitParameter("resetEnable", "false");return servletRegistrationBean;}@Beanpublic FilterRegistrationBean filterRegistrationBean() {FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());filterRegistrationBean.addUrlPatterns("/*");filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");return filterRegistrationBean;}@ConfigurationProperties(prefix = DB_PREFIX)class IDataSourceProperties {private String url;private String username;private String password;private String driverClassName;private int initialSize;private int minIdle;private int maxActive;private int maxWait;private int timeBetweenEvictionRunsMillis;private int minEvictableIdleTimeMillis;private String validationQuery;private boolean testWhileIdle;private boolean testOnBorrow;private boolean testOnReturn;private boolean poolPreparedStatements;private int maxPoolPreparedStatementPerConnectionSize;private String filters;private String connectionProperties;@Bean  public DataSource dataSource() {DruidDataSource datasource = new DruidDataSource();datasource.setUrl(url);datasource.setUsername(username);datasource.setPassword(password);datasource.setDriverClassName(driverClassName);//configurationdatasource.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) {System.err.println("druid configuration initialization filter: " + e);}datasource.setConnectionProperties(connectionProperties);return datasource;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getDriverClassName() {return driverClassName;}public void setDriverClassName(String driverClassName) {this.driverClassName = driverClassName;}public int getInitialSize() {return initialSize;}public void setInitialSize(int initialSize) {this.initialSize = initialSize;}public int getMinIdle() {return minIdle;}public void setMinIdle(int minIdle) {this.minIdle = minIdle;}public int getMaxActive() {return maxActive;}public void setMaxActive(int maxActive) {this.maxActive = maxActive;}public int getMaxWait() {return maxWait;}public void setMaxWait(int maxWait) {this.maxWait = maxWait;}public int getTimeBetweenEvictionRunsMillis() {return timeBetweenEvictionRunsMillis;}public void setTimeBetweenEvictionRunsMillis(int timeBetweenEvictionRunsMillis) {this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;}public int getMinEvictableIdleTimeMillis() {return minEvictableIdleTimeMillis;}public void setMinEvictableIdleTimeMillis(int minEvictableIdleTimeMillis) {this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;}public String getValidationQuery() {return validationQuery;}public void setValidationQuery(String validationQuery) {this.validationQuery = validationQuery;}public boolean isTestWhileIdle() {return testWhileIdle;}public void setTestWhileIdle(boolean testWhileIdle) {this.testWhileIdle = testWhileIdle;}public boolean isTestOnBorrow() {return testOnBorrow;}public void setTestOnBorrow(boolean testOnBorrow) {this.testOnBorrow = testOnBorrow;}public boolean isTestOnReturn() {return testOnReturn;}public void setTestOnReturn(boolean testOnReturn) {this.testOnReturn = testOnReturn;}public boolean isPoolPreparedStatements() {return poolPreparedStatements;}public void setPoolPreparedStatements(boolean poolPreparedStatements) {this.poolPreparedStatements = poolPreparedStatements;}public int getMaxPoolPreparedStatementPerConnectionSize() {return maxPoolPreparedStatementPerConnectionSize;}public void setMaxPoolPreparedStatementPerConnectionSize(int maxPoolPreparedStatementPerConnectionSize) {this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;}public String getFilters() {return filters;}public void setFilters(String filters) {this.filters = filters;}public String getConnectionProperties() {return connectionProperties;}public void setConnectionProperties(String connectionProperties) {this.connectionProperties = connectionProperties;}}}

查看结果

在本地浏览器中输入http://localhost:8080/druid/login.html
输入用户名admin，密码admin即可查看

效果如下

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