简介
Druid是一个关系型数据库连接池，它是阿里巴巴的一个开源项目。Druid支持所有JDBC兼容的数据库，包括Oracle、MySQL、Derby、PostgreSQL、SQL Server、H2等。Druid在监控、可扩展性、稳定性和性能方面具有明显的优势。通过Druid提供的监控功能，可以实时观察数据库连接池和SQL查询的工作情况。使用Druid连接池，在一定程度上可以提高数据库的访问性能。
本博文采用的gradle方式构建的springboot项目，因此导入jar包也是以gradle方式。
一：创建boot项目，导入druid依赖
dependencies {
compile 'org.springframework.boot:spring-boot-starter-web'
compile 'org.mybatis.spring.boot:mybatis-spring-boot-starter:1.1.1'
compile 'mysql:mysql-connector-java:5.1.37'
compile 'com.alibaba:druid:1.0.27'
}
二：在application-dev.yaml中配置druid属性
spring:
datasource:
dialect: mysql
url: 'jdbc:mysql://127.0.0.1:3306/test_db?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=false'
username: 'admin'
password: 'admin'
driver-class-name: 'com.mysql.jdbc.Driver'
type: com.alibaba.druid.pool.DruidDataSource
initialSize: 1
minIdle : 5
maxActive: 10
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,wall,slf4j
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
useGlobalDataSourceStat: true
monitorUserName: admin
monitorPassword: admin
resetEnable: false
allow:
deny:
exclusions:
session:
store-type: none #springboot默认session存储在redis中，由于本项目暂时未配置redis；故设置store-type：none
三：自定义数据库连接池（可跳过）
package com.chenpt.config; import com.alibaba.druid.pool.DruidDataSource;
import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.context.ApplicationContextException;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.util.StringUtils; import javax.annotation.Resource;
import java.sql.SQLException;
import java.util.Arrays; /**
* Created by admin on 2017/1/18.
*/
@Configuration
@EnableTransactionManagement
@MapperScan(value = "com.chenpt")
public class DatabaseConfiguration implements EnvironmentAware { /**
* 日志记录器
*/
private static final Logger logger = LoggerFactory.getLogger(DatabaseConfiguration.class); @Resource
private Environment env; private RelaxedPropertyResolver resolver; @Override
public void setEnvironment(Environment environment) {
this.env = environment;
this.resolver = new RelaxedPropertyResolver(environment,"spring.datasource.");
} //注册dataSource
@Bean(initMethod = "init", destroyMethod = "close")
public DruidDataSource dataSource() throws SQLException {
if (StringUtils.isEmpty(resolver.getProperty("url"))) {
logger.error("Your database connection pool configuration is incorrect!"
+ " Please check your Spring profile, current profiles are:"
+ Arrays.toString(env.getActiveProfiles()));
throw new ApplicationContextException(
"Database connection pool is not configured correctly");
}
DruidDataSource druidDataSource = new DruidDataSource();
druidDataSource.setDriverClassName(resolver.getProperty("driver-class-name"));
druidDataSource.setUrl(resolver.getProperty("url"));
druidDataSource.setUsername(resolver.getProperty("username"));
druidDataSource.setPassword(resolver.getProperty("password"));
druidDataSource.setInitialSize(Integer.parseInt(resolver.getProperty("initialSize")));
druidDataSource.setMinIdle(Integer.parseInt(resolver.getProperty("minIdle")));
druidDataSource.setMaxActive(Integer.parseInt(resolver.getProperty("maxActive")));
druidDataSource.setMaxWait(Integer.parseInt(resolver.getProperty("maxWait")));
druidDataSource.setTimeBetweenEvictionRunsMillis(Long.parseLong(resolver.getProperty("timeBetweenEvictionRunsMillis")));
druidDataSource.setMinEvictableIdleTimeMillis(Long.parseLong(resolver.getProperty("minEvictableIdleTimeMillis")));
druidDataSource.setValidationQuery(resolver.getProperty("validationQuery"));
druidDataSource.setTestWhileIdle(Boolean.parseBoolean(resolver.getProperty("testWhileIdle")));
druidDataSource.setTestOnBorrow(Boolean.parseBoolean(resolver.getProperty("testOnBorrow")));
druidDataSource.setTestOnReturn(Boolean.parseBoolean(resolver.getProperty("testOnReturn")));
druidDataSource.setPoolPreparedStatements(Boolean.parseBoolean(resolver.getProperty("poolPreparedStatements")));
druidDataSource.setMaxPoolPreparedStatementPerConnectionSize(Integer.parseInt(resolver.getProperty("maxPoolPreparedStatementPerConnectionSize")));
druidDataSource.setFilters(resolver.getProperty("filters"));
return druidDataSource;
} @Bean public PlatformTransactionManager transactionManager() throws SQLException {
return new DataSourceTransactionManager(dataSource());
}
}
四：配置druid（关键性配置）
package com.chenpt.config; import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment; import javax.annotation.Resource;
import java.util.HashMap;
import java.util.Map; /**
* @Author: ch
* @Description:
* @Date: created in 2018/7/26
* @Modified By:
*/
@Configuration
public class DruidConfigration implements EnvironmentAware {
@Resource
Environment environment; /**
* 日志记录器
*/
private static final Logger logger = LoggerFactory.getLogger(DruidConfigration.class); private RelaxedPropertyResolver resolver; @Override
public void setEnvironment(Environment environment) {
this.environment = environment;
this.resolver = new RelaxedPropertyResolver(environment,"spring.datasource.");
} @Bean
public ServletRegistrationBean druidServlet() {
logger.info("init Druid Servlet Configuration ");
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
servletRegistrationBean.setServlet(new StatViewServlet());
servletRegistrationBean.addUrlMappings("/druid/*");
Map<String, String> initParameters = new HashMap<>();
initParameters.put("loginUsername", resolver.getProperty("monitorUserName"));// 用户名
initParameters.put("loginPassword",resolver.getProperty("monitorPassword"));// 密码
// 禁用HTML页面上的“Reset All”功能
initParameters.put("resetEnable", resolver.getProperty("resetEnable"));
// IP白名单 (没有配置或者为空，则允许所有访问)
initParameters.put("allow", resolver.getProperty("allow"));
//IP黑名单 (存在共同时，deny优先于allow)
initParameters.put("deny", resolver.getProperty("deny"));
servletRegistrationBean.setInitParameters(initParameters);
return servletRegistrationBean;
} @Bean
public FilterRegistrationBean filterRegistrationBean() {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new WebStatFilter());
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return filterRegistrationBean;
}
}
到此数据库配置就完成了，接下来启动程序，可以登录druid监控中心（http://localhost:8767/druid/login.html）
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