spring boot集成druid数据库连接池，实现对数据库的监控

一、加入druid依赖

<!--druid --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.27</version></dependency>

二、在application.properties配置文件中加入druid配置

# 初始化大小，最小，最大spring.datasource.initialSize=5spring.datasource.minIdle=5spring.datasource.maxActive=20# 配置获取连接等待超时的时间spring.datasource.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.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.minEvictableIdleTimeMillis=300000# 校验SQL，Oracle配置 spring.datasource.validationQuery=SELECT 1 FROM DUAL，如果不配validationQuery项，则下面三项配置无用spring.datasource.validationQuery=SELECT 'x'spring.datasource.testWhileIdle=truespring.datasource.testOnBorrow=falsespring.datasource.testOnReturn=false# 打开PSCache，并且指定每个连接上PSCache的大小spring.datasource.poolPreparedStatements=truespring.datasource.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spring.datasource.filters=stat,wall,log4j# 通过connectProperties属性来打开mergeSql功能；慢SQL记录spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000# 合并多个DruidDataSource的监控数据spring.datasource.useGlobalDataSourceStat=true

三、配置WebFilter

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

四、配置WebServlet

package com.chhliu.springboot.jpa;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"),// IP白名单 (没有配置或者为空，则允许所有访问)        @WebInitParam(name="deny",value="192.168.0.0"),// IP黑名单 (存在共同时，deny优先于allow)        @WebInitParam(name="loginUsername",value="admin"),// druid监控页面登陆用户名        @WebInitParam(name="loginPassword",value="admin"),// druid监控页面登陆密码        @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 = 1L;}

五、扫描Servlet

package com.chhliu.springboot.jpa;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletComponentScan;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication@EnableEurekaClient@ServletComponentScan // 注意要加上@ServletComponentScan注解，否则Servlet无法生效public class SpringbootJpaDruidApplication {public static void main(String[] args) {SpringApplication.run(SpringbootJpaDruidApplication.class, args);}}

六、启动应用程序

1、在浏览器中输入http://localhost:7602/druid/login.html登陆

2、登陆进去后，监控页面如下：

经过测试发现，无论我们怎么操作，SQL监控一直都显示不出任何的内容，当前使用的spring boot版本为1.4.x版本

七、不使用spring boot自动配置功能，手动初始化DataSource

package com.chhliu.springboot.jpa;import java.sql.SQLException;import javax.sql.DataSource;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;/** *  * 描述：如果不使用代码手动初始化DataSource的话，监控界面的SQL监控会没有数据("是spring boot的bug???") * @author chhliu * 创建时间：2017年2月9日 下午10:33:08 * @version 1.2.0 */@Configurationpublic class DruidConfiguration {    @Value("${spring.datasource.url}")    private String dbUrl;    @Value("${spring.datasource.username}")    private String username;    @Value("${spring.datasource.password}")    private String password;    @Value("${spring.datasource.driverClassName}")    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;    @Value("${spring.datasource.useGlobalDataSourceStat}")    private boolean useGlobalDataSourceStat;    @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(this.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);        datasource.setUseGlobalDataSourceStat(useGlobalDataSourceStat);        try {            datasource.setFilters(filters);        } catch (SQLException e) {            System.err.println("druid configuration initialization filter: "+ e);        }        datasource.setConnectionProperties(connectionProperties);        return datasource;    }}

注意：上面的这个类需要放到和application同级的目录下，这样才能在程序启动的时候初始化DataSource

修改过后结果如下：

发现，SQL监控页面有内容了。估计这个问题是spring boot在升级过程中产生的一个bug。