Springboot入门-配置druid

Druid是Java语言中最好的数据库连接池，在连接池之外，还提供了非常优秀的监控功能。

下面来说明如何在 Spring Boot 中配置使用Druid

1、添加Maven依赖 (或jar包)

<!--druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.11</version>
</dependency>

2、配置数据源相关信息

####################数据源配置####################
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/springsea?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=root

# 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
# 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（参数不同的sql合并统计）、慢SQL记录（执行时间长的sql）
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
#spring.datasource.useGlobalDataSourceStat=true

详细配置参考：spring配置数据库连接池druid

3、创建配置文件

目前Spring Boot中默认支持的连接池有dbcp,dbcp2, tomcat, hikari三种连接池。

由于Druid暂时不在Spring Boot中的直接支持，故需要进行配置信息的定制。

package com.xzh.config;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Value;
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 org.springframework.context.annotation.Primary;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;

/**
* Created by xiangzh on 2017/12/5.
*/
@Configuration
public class DruidConfig {

private Logger logger = LoggerFactory.getLogger(DruidConfig.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.filters}")
private String filters;

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

@Bean     //声明其为Bean实例
@Primary  //在同样的DataSource中，首先使用被标注的DataSource
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);

try {
datasource.setFilters(filters);
} catch (SQLException e) {
logger.error("druid configuration initialization filter", e);
}
datasource.setConnectionProperties(connectionProperties);

return datasource;
}

/**
* 注册一个StatViewServlet
* @return
*/
@Bean
public ServletRegistrationBean DruidStatViewServle2(){
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid333/*");

//添加初始化参数：initParams
/** 白名单，如果不配置或value为空，则允许所有 */
servletRegistrationBean.addInitParameter("allow","127.0.0.1,192.0.0.1");
/** 黑名单，与白名单存在相同IP时，优先于白名单 */
servletRegistrationBean.addInitParameter("deny","192.0.0.1");
/** 用户名 */
servletRegistrationBean.addInitParameter("loginUsername","xiangzhenhai");
/** 密码 */
servletRegistrationBean.addInitParameter("loginPassword","xzh335645");
/** 禁用页面上的“Reset All”功能 */
servletRegistrationBean.addInitParameter("resetEnable","false");
return servletRegistrationBean;
}

/**
* 注册一个：WebStatFilter
* @return
*/
@Bean
public FilterRegistrationBean druidStatFilter2(){
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());

/** 过滤规则 */
filterRegistrationBean.addUrlPatterns("/*");
/** 忽略资源 */
filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid333/*");
return filterRegistrationBean;
}
}

4、启动项目，查看druid监控

参考：

Spring Boot 使用 Druid 和监控配置

Spring Boot Druid数据源配置