一、简介
Druid是阿里巴巴开源平台上一个开源的数据库连接池实现,它结合了C3P0、DBCP、PROXOOL等DB池的优点,同时加入了日志监控,可以很好的监控DB池连接和SQL的执行情况,可以说是针对监控而生的DB连接池(据说是目前最好的连接池,不知道速度有没有BoneCP快)。
Druid官方项目地址及文档
Druid与SpringBoot集成官方项目
二、入门示例(IDEA SpringBoot项目)
1、新建一个SpringBoot工程;
2、pom.xml中添加依赖,如下:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.5.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.41</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
parent依赖为spring-boot-starter-parent,
其中spring-boot-starter-web表示为一个web项目;
spring-boot-starter-jdbc表示使用jdbc访问数据库;
druid-spring-boot-starter为Druid与SpringBoot集成的依赖;
mysql-connector-java是MySQL的java版驱动包;
spring-boot-starter-test是SpringBoot支持的test包。
3、DataSource配置及监控配置
新建一个java类,内容如下:
package com.gabriel.druid.config;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
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.PropertySource;
import javax.sql.DataSource;
/**
* @author Gabriel
* @email 996492571@qq.com
* @time 2018/6/20/020 18:18
* @description Druid数据源配置类及监控配置
**/
@Configuration
@PropertySource(value = "classpath:application.properties")
public class DruidConfig {
@Bean(destroyMethod = "close", initMethod = "init")
@ConfigurationProperties(prefix = "spring.datasource.")
public DataSource druidDataSource(){
return DruidDataSourceBuilder.create().build();
}
/**
* 注册一个StatViewServlet
* @return
*/
@Bean
public ServletRegistrationBean druidStatViewServlet(){
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
servletRegistrationBean.setServlet(new StatViewServlet());
servletRegistrationBean.addUrlMappings("/druid/*");
//添加初始化参数:initParams
//白名单:
servletRegistrationBean.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.
servletRegistrationBean.addInitParameter("deny","192.168.1.73");
//登录查看信息的账号密码.
servletRegistrationBean.addInitParameter("loginUsername","admin");
servletRegistrationBean.addInitParameter("loginPassword","123456");
//是否能够重置数据.
servletRegistrationBean.addInitParameter("resetEnable","false");
return servletRegistrationBean;
}
/**
* 注册一个:filterRegistrationBean
* @return
*/
@Bean
public FilterRegistrationBean druidStatFilter(){
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new WebStatFilter());
//添加过滤规则.
filterRegistrationBean.addUrlPatterns("/*");
//添加不需要忽略的格式信息.
filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return filterRegistrationBean;
}
}
4、属性配置文件
在src/main/resources目录下application.properties添加内容如下:
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/gabriel?useUnicode=true&characterEncoding=utf8&autoReconnect=true&useSSL=true
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.druid.initialSize=5
spring.datasource.druid.minIdle=1
spring.datasource.druid.maxActive=50
spring.datasource.druid.max-wait=600000
# 配置一个连接在池中最小生存的时间,单位是毫秒
spring.datasource.druid.minEvictableIdleTimeMillis=300000
spring.datasource.druid.validationQuery=SELECT 1 FROM DUAL
spring.datasource.druid.testWhileIdle=true
spring.datasource.druid.testOnBorrow=false
spring.datasource.druid.testOnReturn=false
# 打开PSCache,并且指定每个连接上PSCache的大小
spring.datasource.druid.poolPreparedStatements=false
spring.datasource.druid.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.druid.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能;慢SQL记录
spring.datasource.druid.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
#spring.datasource.druid.useGlobalDataSourceStat=true
5、程序启动
启动MySQL服务;
启动SpringBoot程序;
浏览器访问:http://localhost:8080/druid/即可看到Druid的监控页面了
登录账号和密码为第3步代码配置的loginUsername和loginPassword
三、遇到的问题
1、提示错误,参数类型不符
image.png image.png
原因:pom.xml中未添加spring-boot-starter-web依赖
查看StatViewServlet继承关系图,如下:
image.png
缺少web依赖,就会缺少tomcat-embed,缺少HttpServlet,所以报类型不匹配。
2、空指针异常
image.png
如图1~4行,3和4为创建DruidDataSource对象,任选其一均可;1和2行不是必须的,可以不要;
2的存在与否不影响数据库配置,但是1和3不能共存,否则报空指针异常
Caused by: java.lang.NullPointerException: null
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:311) ~[na:1.8.0_131]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_131]
at com.alibaba.druid.util.JdbcUtils.createDriver(JdbcUtils.java:589) ~[druid-1.1.10.jar:1.1.10]
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:817) ~[druid-1.1.10.jar:1.1.10]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1758) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1695) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE]
... 16 common frames omitted
3、数据库密码加密
image.png
密码加密的步骤如下:
3.1、生成加密后的密码
cmd进入druid Jar包所在的目录,输入如下图的命令(前提是配置了java的环境变量)即可;将密码和publicKey添加到application.properties配置文件中
image.png
以上就是我在尝试Druid配置监控及密码加密的整个过程,下面就是成功查看监控的页面。项目完整代码参见项目完整代码工程
网友评论