druid 数据库连接池 旧城等待, 2022-06-04 00:07 218阅读 0赞 java程序很大一部分要操作数据库,为了提高性能操作数据库的时候,有不得不使用数据库连接池。数据库连接池有很多选择,c3p、dhcp、proxool等,druid作为一名后起之秀,凭借其出色的性能,也逐渐印入了大家的眼帘。接下来本教程就说一下druid的简单使用。 首先从 [http://repo1.maven.org/maven2/com/alibaba/druid/][http_repo1.maven.org_maven2_com_alibaba_druid] 下载最新的jar包。如果想使用最新的源码编译,可以从 [https://github.com/alibaba/druid][https_github.com_alibaba_druid] 下载源码,然后使用maven命令行,或者导入到eclipse中进行编译。 和dbcp类似,druid的配置项如下 <table style="max-width:100%; background-color:rgb(254,254,254); border-spacing:0px; width:605px; margin-bottom:1.5em; border-width:1px 1px 1px 0px; border-top-style:solid; border-right-style:solid; border-bottom-style:solid; border-top-color:rgb(221,221,221); border-right-color:rgb(221,221,221); border-bottom-color:rgb(221,221,221); font-size:14px; line-height:1.3em; color:rgb(51,51,51); font-family:"Helvetica Neue",Helvetica,Tahoma,Arial,STXihei,"Microsoft YaHei",微软雅黑,sans-serif"> <tbody> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top-width:0px; border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">配置</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top-width:0px; border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">缺省值</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top-width:0px; border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">说明</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">name</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">配置这个属性的意义在于,如果存在多个数据源,监控的时候 <br> 可以通过名字来区分开来。如果没有配置,将会生成一个名字, <br> 格式是:"DataSource-" + System.identityHashCode(this)</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">jdbcUrl</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">连接数据库的url,不同数据库不一样。例如: <br> mysql : jdbc:mysql://10.20.153.104:3306/druid2 <br> oracle : jdbc:oracle:thin:@10.20.149.85:1521:ocnauto</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">username</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">连接数据库的用户名</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">password</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">连接数据库的密码。如果你不希望密码直接写在配置文件中, <br> 可以使用ConfigFilter。详细看这里: <br> <a href="https://github.com/alibaba/druid/wiki/%E4%BD%BF%E7%94%A8ConfigFilter" style="text-decoration:none; color:rgb(12,137,207)" rel="nofollow">https://github.com/alibaba/druid/wiki/%E4%BD%BF%E7%94%A8ConfigFilter</a></span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">driverClassName</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">根据url自动识别</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">这一项可配可不配,如果不配置druid会根据url自动识别dbType,然后选择相应的driverClassName</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">initialSize</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">0</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">初始化时建立物理连接的个数。初始化发生在显示调用init方法,或者第一次getConnection时</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">maxActive</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">8</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">最大连接池数量</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">maxIdle</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">8</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">已经不再使用,配置了也没效果</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">minIdle</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">最小连接池数量</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">maxWait</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">获取连接时最大等待时间,单位毫秒。配置了maxWait之后, <br> 缺省启用公平锁,并发效率会有所下降, <br> 如果需要可以通过配置useUnfairLock属性为true使用非公平锁。</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">poolPreparedStatements</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">false</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">是否缓存preparedStatement,也就是PSCache。 <br> PSCache对支持游标的数据库性能提升巨大,比如说oracle。 <br> 在mysql5.5以下的版本中没有PSCache功能,建议关闭掉。<br> 作者在5.5版本中使用PSCache,通过监控界面发现PSCache有缓存命中率记录, <br> 该应该是支持PSCache。</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">maxOpenPreparedStatements</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">-1</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">要启用PSCache,必须配置大于0,当大于0时, <br> poolPreparedStatements自动触发修改为true。 <br> 在Druid中,不会存在Oracle下PSCache占用内存过多的问题, <br> 可以把这个数值配置大一些,比如说100</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">validationQuery</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">用来检测连接是否有效的sql,要求是一个查询语句。 <br> 如果validationQuery为null,testOnBorrow、testOnReturn、 <br> testWhileIdle都不会其作用。</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">testOnBorrow</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">true</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">申请连接时执行validationQuery检测连接是否有效,做了这个配置会降低性能。</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">testOnReturn</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">false</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">归还连接时执行validationQuery检测连接是否有效,做了这个配置会降低性能</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">testWhileIdle</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">false</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">建议配置为true,不影响性能,并且保证安全性。 <br> 申请连接的时候检测,如果空闲时间大于 <br> timeBetweenEvictionRunsMillis, <br> 执行validationQuery检测连接是否有效。</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">timeBetweenEvictionRunsMillis</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">有两个含义: <br> 1) Destroy线程会检测连接的间隔时间 <br> 2) testWhileIdle的判断依据,详细看testWhileIdle属性的说明</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">numTestsPerEvictionRun</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">不再使用,一个DruidDataSource只支持一个EvictionRun</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">minEvictableIdleTimeMillis</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">connectionInitSqls</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">物理连接初始化的时候执行的sql</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">exceptionSorter</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">根据dbType自动识别</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">当数据库抛出一些不可恢复的异常时,抛弃连接</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">filters</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">属性类型是字符串,通过别名的方式配置扩展插件, <br> 常用的插件有: <br> 监控统计用的filter:stat <br> 日志用的filter:log4j <br> 防御sql注入的filter:wall</span></td> </tr> <tr style="line-height:1.3em"> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">proxyFilters</span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px"><br> </span></td> <td style="padding:8px; line-height:1.3em; vertical-align:top; border-top:1px solid rgb(221,221,221); border-left:1px solid rgb(221,221,221)"> <span style="font-size:12px">类型是List<com.alibaba.druid.filter.Filter>, <br> 如果同时配置了filters和proxyFilters, <br> 是组合关系,并非替换关系</span></td> </tr> </tbody> </table> #### 表1.1 配置属性 #### 加入 druid-1.0.9.jar ApplicationContext.xml **\[html\]** [view plain][] [copy][view plain] 1. **<** **bean** name = "transactionManager" class ="org.springframework.jdbc.datasource.DataSourceTransactionManager" **>** 2. **<** **property** name = "dataSource" ref = "dataSource" **>****</** **property** **>** 3. **</** **bean** **>** 4. **<** **bean** id = "propertyConfigurer" class ="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" **>** 5. **<** **property** name = "locations" **>** 6. **<** **list** **>** 7. **<** **value** **>** /WEB-INF/classes/dbconfig.properties **</** **value** **>** 8. **</** **list** **>** 9. **</** **property** **>** 10. **</** **bean** **>** ApplicationContext.xml配置druid **\[html\]** [view plain][] [copy][view plain] 1. <!-- 阿里 druid 数据库连接池 --> 2. **<** **bean** id = "dataSource" class = "com.alibaba.druid.pool.DruidDataSource"destroy\-method = "close" **>** 3. <!-- 数据库基本信息配置 --> 4. **<** **property** name = "url" value = "$\{url\}" **/>** 5. **<** **property** name = "username" value = "$\{username\}" **/>** 6. **<** **property** name = "password" value = "$\{password\}" **/>** 7. **<** **property** name = "driverClassName" value = "$\{driverClassName\}" **/>** 8. **<** **property** name = "filters" value = "$\{filters\}" **/>** 9. <!-- 最大并发连接数 --> 10. **<** **property** name = "maxActive" value = "$\{maxActive\}" **/>** 11. <!-- 初始化连接数量 --> 12. **<** **property** name = "initialSize" value = "$\{initialSize\}" **/>** 13. <!-- 配置获取连接等待超时的时间 --> 14. **<** **property** name = "maxWait" value = "$\{maxWait\}" **/>** 15. <!-- 最小空闲连接数 --> 16. **<** **property** name = "minIdle" value = "$\{minIdle\}" **/>** 17. <!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 --> 18. **<** **property** name = "timeBetweenEvictionRunsMillis" value ="$\{timeBetweenEvictionRunsMillis\}" **/>** 19. <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 --> 20. **<** **property** name = "minEvictableIdleTimeMillis" value ="$\{minEvictableIdleTimeMillis\}" **/>** 21. **<** **property** name = "validationQuery" value = "$\{validationQuery\}" **/>** 22. **<** **property** name = "testWhileIdle" value = "$\{testWhileIdle\}" **/>** 23. **<** **property** name = "testOnBorrow" value = "$\{testOnBorrow\}" **/>** 24. **<** **property** name = "testOnReturn" value = "$\{testOnReturn\}" **/>** 25. **<** **property** name = "maxOpenPreparedStatements" value ="$\{maxOpenPreparedStatements\}" **/>** 26. <!-- 打开 removeAbandoned 功能 --> 27. **<** **property** name = "removeAbandoned" value = "$\{removeAbandoned\}" **/>** 28. <!-- 1800 秒,也就是 30 分钟 --> 29. **<** **property** name = "removeAbandonedTimeout" value ="$\{removeAbandonedTimeout\}" **/>** 30. <!-- 关闭 abanded 连接时输出错误日志 --> 31. **<** **property** name = "logAbandoned" value = "$\{logAbandoned\}" **/>** 32. **</** **bean** **>** dbconfig.properties **\[html\]** [view plain][] [copy][view plain] 1. url: jdbc:mysql:// localhost :3306/ newm 2. driverClassName: com.mysql.jdbc.Driver 3. username: root 4. password: root 5. filters: stat 6. maxActive: 20 7. initialSize: 1 8. maxWait: 60000 9. minIdle: 10 10. maxIdle: 15 11. timeBetweenEvictionRunsMillis: 60000 12. minEvictableIdleTimeMillis: 300000 13. validationQuery: SELECT 'x' 14. testWhileIdle: true 15. testOnBorrow: false 16. testOnReturn: false 17. maxOpenPreparedStatements: 20 18. removeAbandoned: true 19. removeAbandonedTimeout: 1800 20. logAbandoned: true web.xml **\[html\]** [view plain][] [copy][view plain] 1. <!-- 连接池 启用 Web 监控统计功能 start--> 2. <!-- 启用druid的监控功能 --> <servlet> <servlet-name>statViewServlet</servlet-name> <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class> <init-param> <param-name>loginUsername</param-name> <param-value>admin</param-value> </init-param> <init-param> <param-name>loginPassword</param-name> <param-value>jiaozi</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>statViewServlet</servlet-name> <url-pattern>/druid/\*</url-pattern> </servlet-mapping> 3. <!-- 连接池 启用 Web 监控统计功能 end--> 访问监控页面: http://ip:port/projectName/druid/index.html [http_repo1.maven.org_maven2_com_alibaba_druid]: http://repo1.maven.org/maven2/com/alibaba/druid/ [https_github.com_alibaba_druid]: https://github.com/alibaba/druid [view plain]: http://blog.csdn.net/hj7jay/article/details/51686418#
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