SpringBoot集成阿里巴巴Druid监控的示例代码

druid是阿里巴巴开源的数据库连接池，提供了优秀的对数据库操作的监控功能，本文要讲解一下springboot项目怎么集成druid。

本文在基于jpa的项目下开发，首先在pom文件中额外加入druid依赖，pom文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>

 <groupId>com.dalaoyang</groupId>
 <artifactId>springboot_druid</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <packaging>jar</packaging>

 <name>springboot_druid</name>
 <description>springboot_druid</description>

 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>1.5.12.RELEASE</version>
  <relativePath/> <!-- lookup parent from repository -->
 </parent>

 <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <java.version>1.8</java.version>
 </properties>

 <dependencies>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-jpa</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>

  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-devtools</artifactId>
   <scope>runtime</scope>
  </dependency>
  <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <scope>runtime</scope>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
   <scope>test</scope>
  </dependency>
  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid</artifactId>
   <version>1.0.28</version>
  </dependency>
 </dependencies>

 <build>
  <plugins>
   <plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
   </plugin>
  </plugins>
 </build>
</project>

application.properties上半段和整合jpa一点没变，下面加入了一些druid的配置，如果对druid的配置有什么不理解的，可以去网上查一下。（这篇文章我觉得写的很好，传送门）

#端口号
server.port=8888

##validate 加载hibernate时，验证创建数据库表结构
##create 每次加载hibernate，重新创建数据库表结构，这就是导致数据库表数据丢失的原因。
##create-drop  加载hibernate时创建，退出是删除表结构
##update     加载hibernate自动更新数据库结构
##validate 启动时验证表的结构，不会创建表
##none 启动时不做任何操作
spring.jpa.hibernate.ddl-auto=create

##控制台打印sql
spring.jpa.show-sql=true

##数据库配置
##数据库地址
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false
##数据库用户名
spring.datasource.username=root
##数据库密码
spring.datasource.password=root
##数据库驱动
spring.datasource.driver-class-name=com.mysql.jdbc.Driver


#这里是不同的
#使用druid的话 需要多配置一个属性spring.datasource.type
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource 


# 连接池的配置信息
# 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 
spring.datasource.validationQuery=SELECT 1 FROM DUAL 
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

然后在项目中加入DruidConfig，简单讲解一下，这个配置文件主要是加载application.properties的配置，代码如下：

package com.dalaoyang.config;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.apache.log4j.Logger;
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;
/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.config
 * @email yangyang@dalaoyang.cn
 * @date 2018/4/12
 */
@Configuration
public class DruidConfig {
 private Logger logger = Logger.getLogger(this.getClass());

 @Value("${spring.datasource.url}")
 private String dbUrl;

 @Value("${spring.datasource.username}")
 private String username;

 @Value("${spring.datasource.password}")
 private String password;

 @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;

 @Bean
 @Primary //主数据源
 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);
  try {
   datasource.setFilters(filters);
  } catch (SQLException e) {
   logger.error("druid configuration Exception",e);
  }
  datasource.setConnectionProperties(connectionProperties);
  return datasource;
 }
}

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