参考网页

为何要集成Druid

性能

官方数据Benchmark_aliyun,druid在响应时间上优于其他几个线程池。非官方的测试数据可能差距没这么明显，但仍然高于其他几个线程池。

自带监控功能

自带监控，可帮助开发者找出慢查询，查看并发数等。

步骤1--pom文件中加入Druid依赖

<!-- ==========集成Druid start==========-->

<dependency>

<groupId>com.alibaba</groupId>

<artifactId>druid</artifactId>

<version>1.0.31</version>

</dependency>

<!-- ==========集成Druid end==========-->

步骤2--在application.properties配置文件中加入druid配置

############################################# Druid参数

# 初始化大小，最小，最大  

spring.datasource.initialSize=5  

spring.datasource.minIdle=5  

spring.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=true  

spring.datasource.testOnBorrow=false  

spring.datasource.testOnReturn=false  

# 打开PSCache，并且指定每个连接上PSCache的大小  

spring.datasource.poolPreparedStatements=true  

spring.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

步骤3--配置WebFilter【过滤不需要监控的后缀】

package com.richfit.ruiche.common.druidConfig;


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 {  

  

}

步骤4--配置WebServlet【监控视图配置】

package com.richfit.ruiche.common.druidConfig;


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=""),// 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;  

  

}

步骤5--不使用spring boot自动配置功能，手动初始化DataSource

package com.richfit.ruiche.common.druidConfig;


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

 */  

@Configuration  

public 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}")  

    @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;  

    @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;  

    }  

}

步骤6--主启动类上设置扫描Servlet

package com.richfit.ruiche;


import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.context.properties.EnableConfigurationProperties;

import org.springframework.boot.web.servlet.ServletComponentScan;

import org.springframework.scheduling.annotation.EnableAsync;

import org.springframework.scheduling.annotation.EnableScheduling;


import com.richfit.ruiche.common.globalSetting.RunEnvSetting;

import com.richfit.ruiche.framework.threadPool.TaskThreadPoolConfig;

import com.richfit.ruiche.util.EMailConfig;




//@SpringBootApplication(exclude = SpringDataWebAutoConfiguration.class)

//@EnableConfigurationProperties({EMailConfig.class,SSLEMailConfig.class,WebVersion.class})



@SpringBootApplication

@EnableConfigurationProperties({EMailConfig.class,RunEnvSetting.class,TaskThreadPoolConfig.class})  

//@RestController

//@Configuration  

//@ComponentScan(basePackages = "com.richfit.ruiche")

//@EnableAutoConfiguration

@EnableScheduling

//@EnableCaching

//开启对异步任务的支持

@EnableAsync

//注意要加上@ServletComponentScan注解，否则Servlet无法生效 -----Druid监控

@ServletComponentScan

public class RichfitCBMRest {

    public static void main(String[] args) {

        SpringApplication.run(RichfitCBMRest.class, args);

        

   //打印系统中定义的服务类     

// ApplicationContext ctx = SpringApplication.run(RichfitCBMRest.class,

// args);

// String[] beanNames = ctx.getBeanNamesForAnnotation(Service.class);

// System.out.println("Service注解beanNames个数：" + beanNames.length);

//

// for (String bn : beanNames) {

// System.out.println(bn);

// }

//

// System.out.println("打印结束");

    }

}