SpringBoot 中使用 Druid 数据库连接池 步骤速查

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.1.14</version>
</dependency>
<dependency>
	<groupId>log4j</groupId>
	<artifactId>log4j</artifactId>
	<version>1.2.17</version>
</dependency>

server:
  servlet:
    context-path: /
    session:
      timeout: 60m
  port: 8080

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:9080/hospital?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
    username: root
    password: root
    # 环境 dev|test|pro
    profiles:
      active: dev
    driver-class-name: com.mysql.cj.jdbc.Driver

    ##########################  druid配置   ##########################
    type: com.alibaba.druid.pool.DruidDataSource
    # 初始化大小，最小，最大 
    initialSize: 5
    minIdle: 1
    maxActive: 20
        # 配置获取连接等待超时的时间  
    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  
    timeBetweenEvictionRunsMillis: 60000
    # 配置一个连接在池中最小生存的时间，单位是毫秒  
    minEvictableIdleTimeMillis: 300000
    # 校验SQL，Oracle配置 validationQuery=SELECT 1 FROM DUAL，如果不配validationQuery项，则下面三项配置无用  
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    # 打开PSCache，并且指定每个连接上PSCache的大小  
    poolPreparedStatements: true
    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  
    filters: stat,wall,log4j
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录  
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
    # 合并多个DruidDataSource的监控数据  
    useGlobalDataSourceStat: true
    
# Mybatis配置
mybatis:
  mapperLocations: classpath:mapper/*.xml,classpath:mapper/extend/*.xml
  configuration:
    map-underscore-to-camel-case: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

import java.sql.SQLException;
import javax.sql.DataSource;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import com.alibaba.druid.pool.DruidDataSource;

@Configuration
public class DruidDBConfig {
	private Logger logger = Logger.getLogger(this.getClass());	//log4j日志

	@Value("${spring.datasource.url}")
	private String dbUrl;

	@Value("${spring.datasource.username}")
	private String username;

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

	@Value("${spring.datasource.driver-class-name}")
	private String driverClassName;

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

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

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

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

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

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

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

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

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

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

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

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

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

	@Value("{spring.datasource.connectionProperties}")
	private String connectionProperties;

	@Bean // 声明其为Bean实例
	@Primary // 在同样的DataSource中，首先使用被标注的DataSource
	public DataSource dataSource() {
		DruidDataSource datasource = new DruidDataSource();

		datasource.setUrl(dbUrl);
		datasource.setUsername(username);
		datasource.setPassword(password);
		datasource.setDriverClassName(driverClassName);

		// configuration
		datasource.setInitialSize(initialSize);
		datasource.setMinIdle(minIdle);
		datasource.setMaxActive(maxActive);
		datasource.setMaxWait(maxWait);
		datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
		datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
		datasource.setValidationQuery(validationQuery);
		datasource.setTestWhileIdle(testWhileIdle);
		datasource.setTestOnBorrow(testOnBorrow);
		datasource.setTestOnReturn(testOnReturn);
		datasource.setPoolPreparedStatements(poolPreparedStatements);
		datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
		try {
			datasource.setFilters(filters);
		} catch (SQLException e) {
			//logger.error("druid configuration initialization filter", e);
			logger.error("druid configuration initialization filter", e);
			e.printStackTrace();
		}
		datasource.setConnectionProperties(connectionProperties);

		return datasource;
	}

}

import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;
import com.alibaba.druid.support.http.WebStatFilter;
@WebFilter(filterName="druidWebStatFilter",urlPatterns="/*",
 initParams={
 @WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")//忽略资源
 }
)
public class DruidStatFilter extends WebStatFilter {
 }

import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
 
import com.alibaba.druid.support.http.StatViewServlet;
 
@WebServlet(urlPatterns="/druid/*",
    initParams={
         @WebInitParam(name="allow",value="127.0.0.1,192.168.163.1"),// IP白名单(没有配置或者为空，则允许所有访问)
         @WebInitParam(name="deny",value="192.168.1.73"),// IP黑名单 (存在共同时，deny优先于allow)
         @WebInitParam(name="loginUsername",value="admin"),// 用户名
         @WebInitParam(name="loginPassword",value="admin"),// 密码
         @WebInitParam(name="resetEnable",value="false")// 禁用HTML页面上的“Reset All”功能
})
public class DruidStatViewServlet extends StatViewServlet {
	private static final long serialVersionUID = -2688872071445249539L;
 
}

@SpringBootApplication()
@MapperScan("cn.china.mytestproject.dao")
//添加servlet组件扫描，使得Spring能够扫描到我们编写的servlet和filter
@ServletComponentScan
public class MytestprojectApplication {
 public static void main(String[] args) {
 SpringApplication.run(MytestprojectApplication.class, args);
 } 
}