继上一篇博客SpringBoot系列之JDBC数据访问之后,本博客再介绍数据库连接池框架Druid的使用
实验环境准备:
- Maven
- IntelliJ IDEA
先新建一个Springboot Initializer项目,详情参考SpringBoot系列之快速创建Initializer项目,注意引入必须的JDBC,web依赖等等,因为Druid默认没提供,所以去https://mvnrepository.com/artifact/com.alibaba/druid获取配置信息,项目创建之后,pom配置应该有如下:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.27</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.2</version>
</dependency>
新增一个application.yml配置文件,加上如下配置:type: com.alibaba.druid.pool.DruidDataSource必须指定
spring:
datasource:
url: jdbc:mysql://127.0.0.1:3306/springboot?characterEncoding=utf8&useSSL=true
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
initialization-mode: always
type: com.alibaba.druid.pool.DruidDataSource
# 连接池设置
initial-size: 5
min-idle: 5
max-active: 20
# 配置获取连接等待超时的时间
max-wait: 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
time-between-eviction-runs-millis: 90000
# 配置一个连接在池中最小生存的时间,单位是毫秒
min-evictable-idle-time-millis: 300000
# Oracle请使用select 1 from dual
validation-query: SELECT 1
test-while-idle: true
test-on-borrow: false
test-on-return: false
# 打开PSCache,并且指定每个连接上PSCache的大小
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 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
connection-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
use-global-data-source-stat: true
写一个junit测试类进行测试:
package com.example.springboot.jdbc;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
@SpringBootTest
class SppringbootJdbcApplicationTests {
@Autowired
DataSource dataSource;
@Test
public void contextLoads() throws SQLException {
System.out.println(dataSource.getClass());
Connection connection = dataSource.getConnection();
System.out.println(connection);
connection.close();
}
}
经过调试,属性都没起效,原因是Springboot的自动配置类并没有如下属性的,所以在idea里都标识显示如下颜色:
所以要让这些配置起效,需要写个配置类,通过ConfigurationProperties进行属性映射
@Configuration
public class DriudConfig {
@Primary
@Bean
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource dataSource(){
return new DruidDataSource();
}
}
再次启动junit调试,发现属性都起效了,ok,测试通过
Druid提供了一个针对数据源等等进行监控的平台,所以需要配置才能正常使用
package com.example.springboot.jdbc.config;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
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 org.springframework.context.annotation.Primary;
import javax.sql.DataSource;
/**
* <pre>
* Druid配置类
* </pre>
*
* @author nicky
* <pre>
* 修改记录
* 修改后版本: 修改人: 修改日期: 2019年12月15日 修改内容:
* </pre>
*/
@Configuration
public class DriudConfig {
@Primary
@Bean
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource dataSource(){
return new DruidDataSource();
}
/**
* 注册ServletRegistrationBean
* @return
*/
@Bean
public ServletRegistrationBean registrationBean() {
ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
/** 初始化参数配置,initParams**/
//白名单
bean.addInitParameter("allow", "127.0.0.1");
//IP黑名单 (存在共同时,deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.
bean.addInitParameter("deny", "192.168.1.73");
//登录查看信息的账号密码.
bean.addInitParameter("loginUsername", "admin");
bean.addInitParameter("loginPassword", "admin");
//是否能够重置数据.
bean.addInitParameter("resetEnable", "false");
return bean;
}
/**
* 注册FilterRegistrationBean
* @return
*/
@Bean
public FilterRegistrationBean druidStatFilter() {
FilterRegistrationBean bean = new FilterRegistrationBean(new WebStatFilter());
//添加过滤规则.
bean.addUrlPatterns("/*");
//添加不需要忽略的格式信息.
bean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return bean;
}
}
ok,访问http://127.0.0.1:8080/ ,输入代码里配置的账号密码就可以登录进行访问,我设置的账号密码都是admin,输入账号密码登录平台,查询数据源,sql监控等等功能
代码例子下载:github下载链接
原文地址:https://www.cnblogs.com/mzq123/p/12043753.html
时间: 2024-10-10 20:16:08