引言: 在Spring Boot下默认提供了若干种可用的连接池,Druid来自于阿里系的一个开源连接池,在连接池之外,还提供了非常优秀的监控功能,这里讲解如何与Spring Boot实现集成。
1. 环境描述
spring Boot 1.4.0.RELEASE, JDK 1.8
2. Druid介绍
Druid是一个JDBC组件,它包括三部分:
- DruidDriver 代理Driver,能够提供基于Filter-Chain模式的插件体系。
- DruidDataSource 高效可管理的数据库连接池。
- SQLParser
Druid可以做什么?
可以监控数据库访问性能,Druid内置提供了一个功能强大的StatFilter插件,能够详细统计SQL的执行性能,这对于线上分析数据库访问性能有帮助。
替换DBCP和C3P0。Druid提供了一个高效、功能强大、可扩展性好的数据库连接池。
数据库密码加密。直接把数据库密码写在配置文件中,这是不好的行为,容易导致安全问题。DruidDruiver和DruidDataSource都支持PasswordCallback。
SQL执行日志,Druid提供了不同的LogFilter,能够支持Common-Logging、Log4j和JdkLog,你可以按需要选择相应的LogFilter,监控你应用的数据库访问情况。
扩展JDBC,如果你要对JDBC层有编程的需求,可以通过Druid提供的Filter-Chain机制,很方便编写JDBC层的扩展插件。
项目地址: https://github.com/alibaba/druid
3. Spring Boot与Druid的集成
MySQL Driver驱动包:
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< dependency > < groupId >mysql</ groupId > < artifactId >mysql-connector-java</ artifactId > < scope >runtime</ scope > </ dependency > |
Spring Boot的JPA依赖包:
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< dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-data-jpa</ artifactId > </ dependency > |
阿里系的Druid依赖包:
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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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# 驱动配置信息 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 #连接池的配置信息 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中驱动配置信息没有问题,但是连接池的配置信息不再支持这里的配置项,即无法通过配置项直接支持相应的连接池;这里列出的这些配置项可以通过定制化DataSource来实现。
目前Spring Boot中默认支持的连接池有dbcp,dbcp2, tomcat, hikari三种连接池。
由于Druid暂时不在Spring Bootz中的直接支持,故需要进行配置信息的定制:
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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 //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); try { datasource.setFilters(filters); } catch (SQLException e) { logger.error( "druid configuration initialization filter" , e); } datasource.setConnectionProperties(connectionProperties); return datasource; } } |
DruidDBConfig类被@Configuration标注,用作配置信息; DataSource对象被@Bean声明,为Spring容器所管理, @Primary表示这里定义的DataSource将覆盖其他来源的DataSource。
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# 下面为连接池的补充设置,应用到上面所有数据源中 # 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 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 |
需要注意的是:spring.datasource.type旧的spring boot版本是不能识别的。
配置StatView的Servlet:
Filter的实现类:
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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/*" ) //忽略资源 } ) 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白名单(没有配置或者为空,则允许所有访问) @WebInitParam (name= "deny" ,value= "192.168.1.73" ), // IP黑名单 (存在共同时,deny优先于allow) @WebInitParam (name= "loginUsername" ,value= "admin" ), // 用户名 @WebInitParam (name= "loginPassword" ,value= "123456" ), // 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 = -2688872071445249539L; } |
这两个类相当于在web.xml中声明了一个servlet, 等价于如下的配置信息(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 > |
然后相应的配置工作就完成了,直接启动即可看到相应的应用了。
4. 运行界面以及介绍
访问地址: http://192.168.163.1:8080/druid/index.html
5. 参考资料
http://blog.csdn.net/xiaoyu411502/article/details/51392237
http://stackoverflow.com/questions/32833641/not-able-to-set-spring-datasource-type
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/blueheart20/article/details/52384032