【SpringBoot笔记】SpringBoot整合Druid数据连接池

废话少说，按SpringBoot的老套路来。

【step1】：添加依赖

<!-- 数据库连接池  -->
<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.25</version>
</dependency>

【step2】：application.yml中添加对应配置

spring:datasource:driverClassName: com.mysql.jdbc.Driverurl: jdbc:mysql://对应自己的数据库连接
    username: xxxpassword: xxx
######################### Druid连接池的配置信息  #################
spring.druid.initialSize: 5                                 #初始化连接大小
spring.druid.minIdle: 5                                     #最小连接池数量
spring.druid.maxActive: 20                                  #最大连接池数量
spring.druid.maxWait: 60000                                 #获取连接时最大等待时间，单位毫秒
spring.druid.timeBetweenEvictionRunsMillis: 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
spring.druid.minEvictableIdleTimeMillis: 300000             #配置一个连接在池中最小生存的时间，单位是毫秒
spring.druid.validationQuery: SELECT 1 FROM DUAL            #测试连接
spring.druid.testWhileIdle: true                            #申请连接的时候检测，建议配置为true，不影响性能，并且保证安全性
spring.druid.testOnBorrow: false                            #获取连接时执行检测，建议关闭，影响性能
spring.druid.testOnReturn: false                            #归还连接时执行检测，建议关闭，影响性能
spring.druid.poolPreparedStatements: false                  #是否开启PSCache，PSCache对支持游标的数据库性能提升巨大，oracle建议开启，mysql下建议关闭
spring.druid.maxPoolPreparedStatementPerConnectionSize: 20  #开启poolPreparedStatements后生效
spring.druid.filters: stat,wall,log4j                       #配置扩展插件，常用的插件有=>stat:监控统计  log4j:日志  wall:防御sql注入
spring.druid.connectionProperties: 'druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000'  #通过connectProperties属性来打开mergeSql功能;慢SQL记录

【step3】：java代码中读取配置，并做相关转换(比如数据库密码加解密等，这里省略)

import java.sql.SQLException;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.boot.context.embedded.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;@Configuration
public class DruidConfiguration {@Value("${spring.datasource.url}")private String url;@Value("${spring.datasource.username}")private String username;@Value("${spring.datasource.password}")private String password;@Value("${spring.datasource.driverClassName}")private String driverClassName;@Value("${spring.druid.initialSize}")private int initialSize;@Value("${spring.druid.minIdle}")private int minIdle;@Value("${spring.druid.maxActive}")private int maxActive;@Value("${spring.druid.maxWait}")private int maxWait;@Value("${spring.druid.timeBetweenEvictionRunsMillis}")private int timeBetweenEvictionRunsMillis;@Value("${spring.druid.minEvictableIdleTimeMillis}")private int minEvictableIdleTimeMillis;@Value("${spring.druid.validationQuery}")private String validationQuery;@Value("${spring.druid.testWhileIdle}")private boolean testWhileIdle;@Value("${spring.druid.testOnBorrow}")private boolean testOnBorrow;@Value("${spring.druid.testOnReturn}")private boolean testOnReturn;@Value("${spring.druid.poolPreparedStatements}")private boolean poolPreparedStatements;@Value("${spring.druid.maxPoolPreparedStatementPerConnectionSize}")private int maxPoolPreparedStatementPerConnectionSize;@Value("${spring.druid.filters}")private String filters;@Value("{spring.druid.connectionProperties}")private String connectionProperties;@Bean@Primarypublic DataSource dataSource() {DruidDataSource datasource = new DruidDataSource();datasource.setUrl(url);datasource.setUsername(username);datasource.setPassword(password);   //这里可以做加密处理
        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) {}datasource.setConnectionProperties(connectionProperties);return datasource;}@Beanpublic ServletRegistrationBean statViewServlet(){ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");servletRegistrationBean.addInitParameter("allow","127.0.0.1");  //设置ip白名单servletRegistrationBean.addInitParameter("deny","192.168.0.19");//设置ip黑名单，优先级高于白名单//设置控制台管理用户servletRegistrationBean.addInitParameter("loginUsername","root");servletRegistrationBean.addInitParameter("loginPassword","root");//是否可以重置数据servletRegistrationBean.addInitParameter("resetEnable","false");return servletRegistrationBean;}@Beanpublic FilterRegistrationBean statFilter(){//创建过滤器FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());//设置过滤器过滤路径filterRegistrationBean.addUrlPatterns("/*");//忽略过滤的形式filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");return filterRegistrationBean;}
}