Spring Boot 使用Druid详解

Spring Boot 使用Druid详解

Druid是java语言中最好的数据库连接池，并且能够提供强大的监控和扩展功能，下面来说明如何在 SpringBoot 中配置使用Druid。

步骤：

1. 在pom.xml中加载依赖

2. 在application.properties中加入数据源配置

3. 编写DruidConfiguration，通过@Bean注解的方式注入druid servlet和filter，以便提供监控页面访问

4. 浏览器访问

一、在pom.xml中加入依赖

com.alibaba

druid

1.0.18

二、在application.properties中加入数据源配置

################## server ################################

server.port=8080

################## datasource ################################

spring.datasource.url = jdbc:mysql://localhost:3306/spring

spring.datasource.username = root

spring.datasource.password = 123456

spring.datasource.driverClassName = com.mysql.jdbc.Driver

#使用Druid数据源

spring.datasource.type=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

spring.datasource.initialSize=5

spring.datasource.minIdle=5

sNcXjlatBpDpring.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 FROMDUAL

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

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

################ Java Persistence Api ###########################

# Specify the DBMS

spring.jpa.database = MYSQL

# Show or not log for each sql query

spring.jpa.show-sql = true

# Hibernate ddl auto (create, create-drop, update)

spring.jpa.hibernate.ddl-auto = update

#[org.hibernate.cfg.ImprovedNamingStrategy #org.hibernate.cfg.DefaultNamingStrategy]

spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy

# stripped before adding them to the entity manager)

spring.jpa.properties.hibernate.dialect= org.hibernate.dialect.MySQL5Dialect

#暂时不用redis，所以none，spring.session.store-type=reids

spring.session.store-type=none

以上是我项目中的配置信息，大家只要关注datasource部分即可。

三、编写DruidConfiguration配置类，通过@Bean注解的方式注入druid servlet和filter，以便提供监控页面访问

package com.example.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 com.alibaba.druid.pool.DruidDataSource;

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

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

/**

* 配置druid数据源

*

*/

@Configuration

public class DruidConfiguration {

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

@Bean

public ServletRegistrationBean druidStatViewServlet() {

ServletRegistrationBean registrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");

registrationBean.addInitParameter("allow", "127.0.0.1");

registrationBean.addInitParameter("deny", "192.168.31.234");

registrationBean.addInitParameter("loginUsername", "admin");

registrationBean.addInitParameter("loginPassword", "123456");

registrationBean.addInitParameter("resetEnable", "false");

return registrationBean;

}

@Bean

public FilterRegistrationBean druidWebStatViewFilter() {

FilterRegistrationBean registrationBean = new FilterRegistrationBean(new WebStatFilter());

registrationBean.addInitParameter("urlPatterns", "/*");

registrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*");

return registrationBean;

}

@Bean

public DataSource druidDataSource(@Value("${spring.datasource.url}") String url,

@Value("${spring.datasource.driverClassName}") String driver,

@Value("${spring.datasource.username}") String userName,

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

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

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

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

int initialSize,

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

int minIdle,

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

int maxWait,

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

int timeBetweenEvictionRunsMillis,

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

int minEvictableIdleTimeMillis,

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

String validationQuery,

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

boolean testWhileIdle,

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

boolean testOnBorrow,

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

boolean testOnReturn,

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

boolean poolPreparedStatements,

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

int maxPoolPreparedStatementPerConnectionSize,

@Value("${spring.datasource.connectionProperties}")

String connectionProperties,

@Value("${spring.datasource.useGlobalDataSourceStat}")

boolean useGlobalDataSourceStat

) {

DruidDataSource dataSource = new DruidDataSource();

/*数据源主要配置*/

dataSource.setUrl(url);

dataSource.setDriverClassName(driver);

dataSource.setUsername(userName);

dataSource.setPassword(password);

/*数据源补充配置*/

dataSource.setMaxActive(maxActive);

dataSource.setInitialSize(initialSize);

dataSource.setMinIdle(minIdle);

dataSource.setMaxWait(maxWait);

dataSource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);

dataSource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);

dataSource.setValidationQuery(validationQuery);

dataSource.setTestOnBorrow(testOnBorrow);

dataSource.setTestOnReturn(testOnReturn);

dataSource.setTestWhileIdle(testWhileIdle);

dataSource.setPoolPreparedStatements(poolPreparedStatements);

dataSource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);

dataSource.setConnectionProperties(connectionProperties);

dataSource.setUseGlobalDataSourceStat(useGlobalDataSourceStat);

try {

dataSource.setFilters(filters);

logger.info("Druid数据源初始化设置成功......");

} catch (SQLException e) {

e.printStackTrace();

logger.info("Druid数据源filters设置失败......");

}

return dataSource;

}

}

四、浏览器访问

在浏览器中输入http://localhost:8080/druid/index.html，首次访问需要使用账号和密码登录

在数据源一栏中，所有加"*"标识的都不能为空，，尤其是filter类名，否则会看不到SQL监控数据。

五、查看SQL监控

执行删除某条记录后，查看SQL监控

到这里，我们就把druid配置成功了。

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