spring中以dataSource方式使用proxool连接池

曾经终败给现在 2022-05-27 05:08 182阅读 0赞

(by goodhumor)

方式一：  
 在Spring的"applicationContext.xml"中的dataSource bean定义——

![None.gif][] < bean  id ="dataSource"   
![None.gif][]    class ="org.logicalcobwebs.proxool.ProxoolDataSource" >   
![None.gif][]     < property  name ="driver" >   
![None.gif][]         < value > com.mysql.jdbc.Driver </ value >   
![None.gif][]     </ property >   
![None.gif][]     < property  name ="driverUrl" >   
![None.gif][]         < value > jdbc:mysql://localhost:3306/dbname?user=yourname & password=yourpass </ value >   
![None.gif][]     </ property >   
![None.gif][]     < property  name ="user"  value ="yourname"   />   
![None.gif][]     < property  name ="password"  value ="yourpass"   />   
![None.gif][]     < property  name ="alias"  value ="Pool\_dbname"   />   
![None.gif][]     < property  name ="houseKeepingSleepTime"  value ="90000"   />   
![None.gif][]     < property  name ="prototypeCount"  value ="0"   />   
![None.gif][]     < property  name ="maximumConnectionCount"  value ="50"   />   
![None.gif][]     < property  name ="minimumConnectionCount"  value ="2"   />   
![None.gif][]     < property  name ="simultaneousBuildThrottle"  value ="50"   />   
![None.gif][]     < property  name ="maximumConnectionLifetime"  value ="14400000"   />   
![None.gif][]     < property  name ="houseKeepingTestSql"  value ="select CURRENT\_DATE"   />   
![None.gif][] </ bean >   
![None.gif][]

第一种方式需要把用户名和密码写在连接串里面，  
ProxoolDataSource类提供的user，password属性似乎没有什么用。  
无论提供什么，它都会以空用户名、密码去连接数据库。  
这可能是Proxool RC0.93的一个bug。  
不过配置中的user，password两个属性还必须设置，否则hibernate会报空指针错误。

方式二：  
 在Spring的"applicationContext.xml"中的dataSource bean定义——

![None.gif][] < bean  id ="dataSource"   
![None.gif][]    class ="org.springframework.jdbc.datasource.DriverManagerDataSource" >   
![None.gif][]     < property  name ="driverClassName" >   
![None.gif][]         < value > org.logicalcobwebs.proxool.ProxoolDriver </ value >   
![None.gif][]     </ property >   
![None.gif][]     < property  name ="url" >   
![None.gif][]         < value > proxool.Pool\_dbname </ value >   
![None.gif][]     </ property >   
![None.gif][] </ bean >

第二种方式需要预先在"web.xml"先配置好Proxool连接池，配置如下：

![None.gif][] < servlet >   
![None.gif][]     < servlet-name > proxoolServletConfigurator </ servlet-name >   
![None.gif][]     < servlet-class >   
![None.gif][]        org.logicalcobwebs.proxool.configuration.ServletConfigurator  
![None.gif][]     </ servlet-class >   
![None.gif][]     < init-param >   
![None.gif][]         < param-name > xmlFile </ param-name >   
![None.gif][]         < param-value > WEB-INF/proxool.xml </ param-value >   
![None.gif][]     </ init-param >   
![None.gif][]     < load-on-startup > 1 </ load-on-startup >   
![None.gif][] </ servlet >   
![None.gif][]  
![None.gif][] < servlet >   
![None.gif][]     < servlet-name > context </ servlet-name >   
![None.gif][]     < servlet-class >   
![None.gif][]        org.springframework.web.context.ContextLoaderServlet  
![None.gif][]     </ servlet-class >   
![None.gif][]     < load-on-startup > 2 </ load-on-startup >   
![None.gif][] </ servlet >

注意，第二种方式下Spring的上下文加载如果想使用listener方式(Struts2要求)，  
则与连接池有关的Bean全得延迟初始化。因为listener比servlet优先初始化，  
如果相关Bean不是lazy-init的话，则启动服务器时会出现Bean找不到连接定义的异常。

<listener>  
  <listener-class>  
      org.springframework.web.context.ContextLoaderListener  
  </listener-class>  
 </listener>

其中proxool的配置文件可以采用xmlFile"proxool.xml"或者propertyFile"proxool.properties"

"proxool.xml"格式如下：

![None.gif][] <? xml version="1.0" encoding="UTF-8" ?>   
![None.gif][] < proxool-config >   
![None.gif][]    < proxool >   
![None.gif][]       < alias > Pool\_dbname </ alias >   
![None.gif][]       < driver-url > jdbc:mysql://localhost:3306/dbname </ driver-url >   
![None.gif][]       < driver-class > com.mysql.jdbc.Driver </ driver-class >   
![None.gif][]       < driver-properties >   
![None.gif][]       < property  name ="user"  value ="yourname" />   
![None.gif][]       < property  name ="password"  value ="yourpass" />   
![None.gif][]       </ driver-properties >   
![None.gif][]       < house-keeping-sleep-time > 60000 </ house-keeping-sleep-time >   
![None.gif][]       < maximum-connection-count > 20 </ maximum-connection-count > 　  
![None.gif][]       < minimum-connection-count > 2 </ minimum-connection-count >   
![None.gif][]       < prototype-count > 0 </ prototype-count >   
![None.gif][]       < simultaneous-build-throttle > 20 </ simultaneous-build-throttle >   
![None.gif][]       < house-keeping-test-sql > select CURRENT\_DATE </ house-keeping-test-sql >   
![None.gif][]       < statistics > 15s,10m,1d </ statistics >   
![None.gif][]       < statistics-log-level > INFO </ statistics-log-level >   
![None.gif][]    </ proxool >   
![None.gif][]    < proxool >   
![None.gif][]        
![None.gif][]    </ proxool >   
![None.gif][] </ proxool-config >

"proxool.properties"格式如下：

![None.gif][] jdbc- 0 .proxool.alias = Pool\_dbname  
![None.gif][]jdbc- 0 .proxool.driver-url = jdbc:mysql://localhost: 3306 /dbname  
![None.gif][]jdbc- 0 .proxool.driver-class = com.mysql.jdbc.Driver  
![None.gif][]jdbc- 0 .user = yourname  
![None.gif][]jdbc- 0 .password = yourpass  
![None.gif][]jdbc- 0 .proxool.house-keeping-sleep-time = 60000   
![None.gif][]jdbc- 0 .proxool.house-keeping-test-sql = select CURRENT\_DATE  
![None.gif][]jdbc- 0 .proxool.maximum-connection-count = 10   
![None.gif][]jdbc- 0 .proxool.minimum-connection-count = 3   
![None.gif][]jdbc- 0 .proxool.maximum-connection-lifetime = 18000000   
![None.gif][]jdbc- 0 .proxool.prototype-count = 3   
![None.gif][]jdbc- 0 .proxool.simultaneous-build-throttle = 10   
![None.gif][]jdbc- 0 .proxool.recently-started-threshold = 60000   
![None.gif][]jdbc- 0 .proxool.overload-without-refusal-lifetime = 50000   
![None.gif][]jdbc- 0 .proxool.maximum-active-time = 60000   
![None.gif][]jdbc- 0 .proxool.verbose = true  
![None.gif][]jdbc- 0 .proxool.trace = true  
![None.gif][]jdbc- 0 .proxool.fatal-sql-exception = Fatal error  
![None.gif][]  
![None.gif][]jdbc- 2 .proxool.alias = Pool\_dbname2  
![None.gif][]……  
![None.gif][]

\-----------------------------------------------------------

个人比较倾向于第二种配置方式，  
一来可以避免在Spring的"applicationContext.xml"中写一大堆参数，  
尤其是避免了driverUrl中带用户名密码（这会显示在proxool包中带的  
org.logicalcobwebs.proxool.admin.servlet.AdminServlet输出的页面中）

二来proxool连接池可以在tomcat启动时就初始化好，可以提高第一次访问web时的连接速度。

[None.gif]: /images/20220527/6a119ea8094148d48731040b2f0aa8d6.png