Spring Boot 使用 Druid 和监控配置

程序员文章站 2022-05-06 21:22:37

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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。

业界把 Druid 和 HikariCP 做对比后，虽说 HikariCP 的性能比 Druid 高，但是因为 Druid 包括很多维度的统计和分析功能，所以这也是大家都选择使用它的原因。

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)

		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.15</version>
		</dependency>

2、配置数据源相关信息

#datasource
spring.datasource.url=jdbc:mysql://192.168.10.20:3306/test?useUnicode=true&characterEncoding=utf-8&rewriteBatchedStatements=true
spring.datasource.username = root
spring.datasource.password = password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

#pool Initialization 
spring.datasource.initialSize=5  
spring.datasource.minIdle=5  
spring.datasource.maxActive=20  
#overtime
spring.datasource.maxWait=60000  
spring.datasource.timeBetweenEvictionRunsMillis=60000  
spring.datasource.minEvictableIdleTimeMillis=300000  
spring.datasource.validationQuery=SELECT 1 FROM DUAL  
spring.datasource.testWhileIdle=true  
spring.datasource.testOnBorrow=false  
spring.datasource.testOnReturn=false  
spring.datasource.poolPreparedStatements=true  
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20  
spring.datasource.filters=stat,wall,log4j  
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
#spring.datasource.useGlobalDataSourceStat=tru

#server
server.port=8081

3、配置监控统计功能

package com.cl.config;

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

/**
 * druid配置 相当于在web.xml中
 * @author cl
 */
@Configuration
public class WebXmlConfig {

	/**
	 * 注册一个StatViewServlet 相当于在web.xml中声明了一个servlet
	 */
	@Bean
	public ServletRegistrationBean druidStatViewServlet() {
		// org.springframework.boot.context.embedded.ServletRegistrationBean提供类的进行注册.
		ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),
				"/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", "admin");
		// 是否能够重置数据.
		servletRegistrationBean.addInitParameter("resetEnable", "false");// 禁用HTML页面上的“Reset
																			// All”功能
		return servletRegistrationBean;
	}

	/**
	 * 注册一个：filterRegistrationBean 相当于在web.xml中声明了一个Filter
	 */
	@Bean
	public FilterRegistrationBean druidStatFilter() {
		FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
		filterRegistrationBean.setName("druidWebStatFilter");
		// 添加过滤规则.
		filterRegistrationBean.addUrlPatterns("/*");
		// 添加忽略的格式信息.
		filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
		return filterRegistrationBean;
	}

}

4、Application.java

dao层的实现，省略~

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import com.alibaba.druid.pool.DruidDataSource;

@EnableAutoConfiguration
@SpringBootApplication
@ComponentScan(basePackages = { "com.cl" }) // 指定spring管理的bean所在的包
@MapperScan("com.cl.dao") // 指定mybatis的mapper接口所在的包
public class Application {

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}

	// 创建数据源
	@Bean
	@ConfigurationProperties(prefix = "spring.datasource") // 指定数据源的前缀,在application.properties文件中指定
	public DruidDataSource dataSource() {
		DruidDataSource dataSource = new DruidDataSource();
		return dataSource;
	}

	// 创建SqlSessionFactory
	@Bean
	public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
		SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
		sqlSessionFactoryBean.setDataSource(dataSource());
		PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
		sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/mybatis/*.xml"));
		return sqlSessionFactoryBean.getObject();
	}

	// 创建事物管理器
	@Bean
	public PlatformTransactionManager transactionManager() {
		return new DataSourceTransactionManager(dataSource());
	}
}