引言： 在Spring Boot下默認提供了若干種可用的連接池，Druid來自于阿里系的一個開源連接池，在連接池之外，還提供了非常優秀的監控功能，這里講解如何與Spring Boot實現集成。

1.? 環境描述

???? Spring Boot 1.4.0.RELEASE,? JDK 1.8

2.?? Druid介紹

???? Druid是一個JDBC組件，它包括三部分：?

• ?DruidDriver 代理Driver，能夠提供基于Filter－Chain模式的插件體系。
• ?DruidDataSource 高效可管理的數據庫連接池。?
• ?SQLParser?

?? Druid可以做什么？??

• ? 可以監控數據庫訪問性能，Druid內置提供了一個功能強大的StatFilter插件，能夠詳細統計SQL的執行性能，這對于線上分析數據庫訪問性能有幫助。
• ? 替換DBCP和C3P0。Druid提供了一個高效、功能強大、可擴展性好的數據庫連接池。
• ? 數據庫密碼加密。直接把數據庫密碼寫在配置文件中，這是不好的行為，容易導致安全問題。DruidDruiver和DruidDataSource都支持PasswordCallback。??
• ?SQL執行日志，Druid提供了不同的LogFilter，能夠支持Common-Logging、Log4j和JdkLog，你可以按需要選擇相應的LogFilter，監控你應用的數據庫訪問情況。?
• ? 擴展JDBC，如果你要對JDBC層有編程的需求，可以通過Druid提供的Filter-Chain機制，很方便編寫JDBC層的擴展插件。?

???? 項目地址： https://github.com/alibaba/druid

3.?? Spring Boot與Druid的集成

?????? MySQL Driver驅動包：

?

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<dependency>??

????????????<groupId>mysql</groupId>??

????????????<artifactId>mysql-connector-java</artifactId>??

????????????<scope>runtime</scope>??

????????</dependency>??

??? Spring Boot的JPA依賴包：

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<dependency>??

????????????<groupId>org.springframework.boot</groupId>??

????????????<artifactId>spring-boot-starter-data-jpa</artifactId>??

????????</dependency>??

?? 阿里系的Druid依賴包：

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<dependency>??

????????????<groupId>com.alibaba</groupId>??

????????????<artifactId>druid</artifactId>??

????????????<version>1.0.25</version>??

????????</dependency>??

??? Spring Boot中的application.properties配置信息：

?

?

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#?驅動配置信息??

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource??

spring.datasource.url?=?jdbc:mysql://127.0.0.1:3306/mealsystem?useUnicode=true&characterEncoding=utf-8??

spring.datasource.username?=?root??

spring.datasource.password?=?123456??

spring.datasource.driverClassName?=?com.mysql.jdbc.Driver??

???

#連接池的配置信息??

spring.datasource.initialSize=5??

spring.datasource.minIdle=5??

spring.datasource.maxActive=20??

spring.datasource.maxWait=60000??

spring.datasource.timeBetweenEvictionRunsMillis=60000??

spring.datasource.minEvictableIdleTimeMillis=300000??

spring.datasource.validationQuery=SELECT?1?FROM?DUAL??

spring.datasource.testWhileIdle=true??

spring.datasource.testOnBorrow=false??

spring.datasource.testOnReturn=false??

spring.datasource.poolPreparedStatements=true??

spring.datasource.maxPoolPreparedStatementPerConnectionSize=20??

spring.datasource.filters=stat,wall,log4j??

spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000??

?在Spring Boot1.4.0中驅動配置信息沒有問題，但是連接池的配置信息不再支持這里的配置項，即無法通過配置項直接支持相應的連接池；這里列出的這些配置項可以通過定制化DataSource來實現。

?

? 目前Spring Boot中默認支持的連接池有dbcp,dbcp2, tomcat, hikari三種連接池。?

由于Druid暫時不在Spring Bootz中的直接支持，故需要進行配置信息的定制：

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@Configuration??

public?class?DruidDBConfig?{??

????private?Logger?logger?=?LoggerFactory.getLogger(DruidDBConfig.class);??

??????

????@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;??

??????

????@Bean?????//聲明其為Bean實例??

????@Primary??//在同樣的DataSource中，首先使用被標注的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);??

????????try?{??

????????????datasource.setFilters(filters);??

????????}?catch?(SQLException?e)?{??

????????????logger.error("druid?configuration?initialization?filter",?e);??

????????}??

????????datasource.setConnectionProperties(connectionProperties);??

??????????

????????return?datasource;??

????}??

}??

??? DruidDBConfig類被@Configuration標注，用作配置信息； DataSource對象被@Bean聲明，為Spring容器所管理， @Primary表示這里定義的DataSource將覆蓋其他來源的DataSource。
??

?

#?下面為連接池的補充設置，應用到上面所有數據源中

#?初始化大小，最小，最大

spring.datasource.initialSize=5

spring.datasource.minIdle=5

spring.datasource.maxActive=20

#?配置獲取連接等待超時的時間

spring.datasource.maxWait=60000

#?配置間隔多久才進行一次檢測，檢測需要關閉的空閑連接，單位是毫秒

spring.datasource.timeBetweenEvictionRunsMillis=60000

#?配置一個連接在池中最小生存的時間，單位是毫秒

spring.datasource.minEvictableIdleTimeMillis=300000

spring.datasource.validationQuery=SELECT?1?FROM DUAL

spring.datasource.testWhileIdle=true

spring.datasource.testOnBorrow=false

spring.datasource.testOnReturn=false

#?打開PSCache，并且指定每個連接上PSCache的大小

spring.datasource.poolPreparedStatements=true

spring.datasource.maxPoolPreparedStatementPerConnectionSize=20

#?配置監控統計攔截的filters，去掉后監控界面sql無法統計，'wall'用于防火墻

spring.datasource.filters=stat,wall,log4j

#?通過connectProperties屬性來打開mergeSql功能；慢SQL記錄

spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

#?合并多個DruidDataSource的監控數據

#spring.datasource.useGlobalDataSourceStat=true

需要注意的是：spring.datasource.type舊的spring boot版本是不能識別的。

?配置StatView的Servlet：

?? Filter的實現類：

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import?javax.servlet.annotation.WebFilter;??

import?javax.servlet.annotation.WebInitParam;??

??

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

??

@WebFilter(filterName="druidWebStatFilter",urlPatterns="/*",??

????initParams={??

????????@WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")//忽略資源??

???}??

)??

public?class?DruidStatFilter?extends?WebStatFilter?{??

??

}??

? StatViewServlet:

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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="127.0.0.1,192.168.163.1"),//?IP白名單(沒有配置或者為空，則允許所有訪問)??

?????????@WebInitParam(name="deny",value="192.168.1.73"),//?IP黑名單?(存在共同時，deny優先于allow)??

?????????@WebInitParam(name="loginUsername",value="admin"),//?用戶名??

?????????@WebInitParam(name="loginPassword",value="123456"),//?密碼??

?????????@WebInitParam(name="resetEnable",value="false")//?禁用HTML頁面上的“Reset?All”功能??

})??

public?class?DruidStatViewServlet?extends?StatViewServlet?{??

????private?static?final?long?serialVersionUID?=?-2688872071445249539L;??

??

}??

這兩個類相當于在web.xml中聲明了一個servlet， 等價于如下的配置信息（web.xml):

?

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<servlet>????

????????<servlet-name>DruidStatView</servlet-name>????

????????<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>????

????</servlet>????

????<servlet-mapping>????

????????<servlet-name>DruidStatView</servlet-name>????

????????<url-pattern>/druid/*</url-pattern>????

????</servlet-mapping>????

?filter的配置信息：

?

?

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<filter>????

????????<filter-name>DruidWebStatFilter</filter-name>????

????????<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>????

????????<init-param>????

????????????<param-name>exclusions</param-name>????

????????????<param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>????

????????</init-param>????

??????</filter>????

??????<filter-mapping>????

????????<filter-name>DruidWebStatFilter</filter-name>????

????????<url-pattern>/*</url-pattern>????

??????</filter-mapping>????

?? 然后相應的配置工作就完成了，直接啟動即可看到相應的應用了。

?

4.??? 運行界面以及介紹

??? 訪問地址： http://192.168.163.1:8080/druid/index.html

?????

???

????

5.?? 參考資料

• • http://blog.csdn.net/xiaoyu411502/article/details/51392237
  • ?http://stackoverflow.com/questions/32833641/not-able-to-set-spring-datasource-type

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