Spring Boot基础教程29-Spring Boot集成Druid

一、 Druid 的介绍 
https://github.com/alibaba/druid/wiki/%E5%90%84%E7%A7%8D%E6%95%B0%E6%8D%AE%E5%BA%93%E8%BF%9
E%E6%8E%A5%E6%B1%A0%E5%AF%B9%E6%AF%94 
中文文档：https://github.com/alibaba/druid/wiki/%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98 

二、 添加依赖 
<dependency> 
<groupId>com.alibaba</groupId> 
<artifactId>druid</artifactId> 
<version>1.0.26</version> 
</dependency> 
三、 配置 
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
#spring.datasource.type=org.apache.tomcat.jdbc.pool.DataSource
spring.datasource.url=jdbc:mysql://localhost/spring_boot_demo?useUnicode=true&characterEncod
ing=utf-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
注意：关于 spring.datasource.type 的说明
旧版本不支持这个属性，1.3.x 开始支持，但是 1.4.0 不支持，1.4.1 重新支持。 
四、 添加 druid 的支持类 
package com.roncoo.example.util.configuration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DatabaseDriver;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.alibaba.druid.pool.DruidDataSource;
@Configuration
public class DruidConfiguration {
@ConditionalOnClass(DruidDataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type", havingValue = 
"com.alibaba.druid.pool.DruidDataSource", matchIfMissing = true)
static class Druid extends DruidConfiguration {
@Bean
@ConfigurationProperties("spring.datasource.druid")
public DruidDataSource dataSource(DataSourceProperties properties) {
DruidDataSource druidDataSource = (DruidDataSource) 
properties.initializeDataSourceBuilder().type(DruidDataSource.class).build();
DatabaseDriver databaseDriver = 
DatabaseDriver.fromJdbcUrl(properties.determineUrl());
String validationQuery = databaseDriver.getValidationQuery();
if (validationQuery != null) {
druidDataSource.setValidationQuery(validationQuery);
}
return druidDataSource;
}
}
}
五、 监控 
1.配置 servlet 
package com.roncoo.example.util.servlet;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import com.alibaba.druid.support.http.StatViewServlet;
/**
*
* @author wujing
*/@WebServlet(urlPatterns = { "/druid/*" }, initParams = 
{ @WebInitParam(name = "loginUsername", value = "roncoo"), 
@WebInitParam(name = "loginPassword", value = "roncoo") })
public class DruidStatViewServlet extends StatViewServlet {
private static final long serialVersionUID = 1L;
} 
2.配置 filter 
package com.roncoo.example.util.filter;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;
import com.alibaba.druid.support.http.WebStatFilter;
/**
* @author wujing
*/
@WebFilter(filterName = "druidWebStatFilter", urlPatterns = 
"/*", initParams = { @WebInitParam(name = "exclusions", value 
= "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*") })
public class DruidWebStatFilter extends WebStatFilter {
}
#初始化连接大小
spring.datasource.druid.initial-size=8
#最小空闲连接数
spring.datasource.druid.min-idle=5
#最大连接数
spring.datasource.druid.max-active=10
#查询超时时间
spring.datasource.druid.query-timeout=6000
#事务查询超时时间
spring.datasource.druid.transaction-query-timeout=6000
#关闭空闲连接超时时间
spring.datasource.druid.remove-abandoned-timeout=1800
3.测试：http://localhost:8080/druid/index.html
4.sql 监控配置
#filter类名:stat,config,encoding,loggingspring.datasource.druid.filters=stat
5.spring 监控配置 
@ImportResource(locations = { "classpath:druid-bean.xml" })