SpringBoot引入Druid数据源

首先引入依赖包

<!-- jdbcTemplate -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

<!-- druid数据库连接池 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.12</version>
</dependency>

<!-- mysql connector -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

1.配置文件application.properties

  与DuridConfig类中的prefix对应，如下：

#durid
spring.datasource.type = com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.druid.url = jdbc:mysql://localhost:3306
spring.datasource.druid.username=root
spring.datasource.druid.password=root
 
# 下面为连接池的补充设置，应用到上面所有数据源中
# 初始化大小，最小，最大
spring.datasource.druid.initialSize=5
spring.datasource.druid.minIdle=5
spring.datasource.druid.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.druid.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 
spring.datasource.druid.timeBetweenEvictionRunsMillis=60000
# 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=true
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 ,slf4j是日志配置，跟项目日志架构一致就行
spring.datasource.druid.filters=stat,wall,slf4j
# 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

2.三个类：Config类、Servlet类、Filter类

1）DuridConfig类

import javax.sql.DataSource;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.alibaba.druid.pool.DruidDataSource;

/**
 * druid配置类 
 */
@Configuration  //标识该类被纳入spring容器中实例化并管理
@ServletComponentScan //用于扫描所有的Servlet、filter、listener
public class DruidConfig {
    @Bean
    @ConfigurationProperties(prefix="spring.datasource.druid") //加载时读取指定的配置信息,前缀为spring.datasource.druid
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }
}

2）DruidStatFilter类

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

import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

/**
 * Servlet Filter implementation class DruidFilter  
 */
@WebFilter(
        filterName="druidWebStatFilter",
        urlPatterns= {"/*"},
        initParams= {
                @WebInitParam(name="exclusions",value="*.js,*.jpg,*.png,*.gif,*.ico,*.css,/druid/*")//配置本过滤器放行的请求后缀
        }
)
public class DruidStatFilter extends WebStatFilter {
}

3）DruidStatViewServlet类

import com.alibaba.druid.support.http.StatViewServlet;
import javax.servlet.Servlet;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;

/**
 * Servlet implementation class DruidStateViewServlet
 * @author xiaowen
 */
@WebServlet(
        urlPatterns= {"/druid/*"},
        initParams= {
                @WebInitParam(name="allow",value="127.0.0.1"),
                @WebInitParam(name="loginUsername",value="root"),
                @WebInitParam(name="loginPassword",value="root"),
                @WebInitParam(name="resetEnable",value="true")// 允许HTML页面上的“Reset All”功能

        }
)
public class DruidStatViewServlet extends StatViewServlet implements Servlet {
    private static final long serialVersionUID = 1L;


}

信息全部配置完成后，运行Springboot项目，输入http://localhost:8080/druid_project/druid/index.html，

然后输入在DruidStatViewServlet类中配置的loginUsername和loginPassword查看druid控制台

SpringBoot配置Druid完成。