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proxool的使用总结

2011-09-26 15:33 274 查看

在项目中使用proxool做数据源管理，这里记录下配置代码与需要注意的事项。

添加jar包：proxool-0.9.0RC3.jar在WEB-INF下，创建proxool.xml文件，代码如下：

01	<? xml version = "1.0" encoding = "UTF-8" ?>

02	<!--theproxoolconfigurationcanbeembeddedwithinyourownapplication's.

03	Anythingoutsidethe"proxool"tagisignored.-->

04	< something-else-entirely >

05	< proxool >

06	< alias >数据源名</ alias >

07	< driver-url >jdbc:mysql://localhost:3306/数据库名</ driver-url >

08	< driver-class >com.mysql.jdbc.Driver</ driver-class >

09	< driver-properties >

10	< property name = "user" value = "用户名" />

11	< property name = "password" value = "密码" />

12	< property name = "useUnicode" value = "true" />

13	< property name = "characterEncoding" value = "UTF-8" />

14	</ driver-properties >

16	< house-keeping-sleep-time >40000</ house-keeping-sleep-time >

17	< maximum-connection-count >250</ maximum-connection-count >

18	< minimum-connection-count >3</ minimum-connection-count >

19	< maximum-connection-lifetime >3000000</ maximum-connection-lifetime > <!--5hours-->

20	< simultaneous-build-throttle >5</ simultaneous-build-throttle >

21	< recently-started-threshold >400000</ recently-started-threshold >

22	< overload-without-refusal-lifetime >500000</ overload-without-refusal-lifetime >

23	< maximum-active-time >600000</ maximum-active-time >

24	< verbose >true</ verbose >

25	< trace >true</ trace >

26	< house-keeping-test-sql >selectCURRENT_DATE</ house-keeping-test-sql >

27	< fatal-sql-exception >Fatalerror</ fatal-sql-exception >

28	< prototype-count >2</ prototype-count >

29	< statistics-log-level >INFO</ statistics-log-level >

30	</ proxool >

31	</ something-else-entirely >

注：proxool.xml的配置参数详细说明请参考这里。

然后在web.xml文件中进行配置，添加如下代码：

01	< servlet >

02	< servlet-name >ServletConfigurator</ servlet-name >

03	< servlet-class >org.logicalcobwebs.proxool.configuration.ServletConfigurator</ servlet-class >

04	< init-param >

05	< param-name >xmlFile</ param-name >

06	< param-value >WEB-INF/proxool.xml</ param-value >

07	</ init-param >

08	< load-on-startup >1</ load-on-startup >

09	</ servlet >

10	< servlet >

11	< servlet-name >Admin</ servlet-name >

12	< servlet-class >org.logicalcobwebs.proxool.admin.servlet.AdminServlet</ servlet-class >

13	</ servlet >-->

14	<!--<servlet-mapping>

15	<servlet-name>Admin</servlet-name>

16	<url-pattern>/admin</url-pattern>

17	</servlet-mapping>-->

上述代码中被注释掉的部分在开发过程中可以释放，如果释放，则会开启数据源监控页面，如果您的访问地址为www.xxx.com，那么数据源监控URL为：www.xxx.com/admin。网站发布到服务器上后，建议关闭该功能。

注意：如果工程中存在监听器，而监听器中调用了数据库中的数据，那么在系统启动的时候会报错

java.sql.SQLException:org.logicalcobwebs.proxool.ProxoolException:Attempttorefertoaunregisteredpoolbyitsalias‘别名’

或者

java.sql.SQLException:Nosuitabledriverfoundfor'数据源名'

这时的解决方案为：把proxool交给监听器进行处理：

新建类：

01	import java.io.File;

02	import java.util.Enumeration;

03	import java.util.Properties;

05	import javax.servlet.ServletContext;

06	import javax.servlet.ServletContextEvent;

07	import javax.servlet.ServletContextListener;

09	import org.apache.commons.logging.Log;

10	import org.apache.commons.logging.LogFactory;

11	import org.logicalcobwebs.proxool.ProxoolException;

12	import org.logicalcobwebs.proxool.configuration.JAXPConfigurator;

13	import org.logicalcobwebs.proxool.configuration.PropertyConfigurator;

/**

16	*@authorwangtao

*/

19	public class ProxoolListener implements ServletContextListener{

20	private static final LogLOG=LogFactory.getLog(ProxoolListener. class );

22	private static final StringXML_FILE_PROPERTY= "xmlFile" ;

24	private static final StringPROPERTY_FILE_PROPERTY= "propertyFile" ;

26	private static final StringAUTO_SHUTDOWN_PROPERTY= "autoShutdown" ;

28	@SuppressWarnings ( "unused" )

29	private boolean autoShutdown= true ;

31	public void contextDestroyed(ServletContextEventarg0){

32	System.out.println( "destroydatabasepool...." );

35	@SuppressWarnings ( "unchecked" )

36	public void contextInitialized(ServletContextEventcontextEvent){

37	System.out.println( "init................" );

38	ServletContextcontext=contextEvent.getServletContext(); //对应servlet的init方法中ServletConfig.getServletContext()

39	StringappDir=contextEvent.getServletContext().getRealPath( "/" );

40	Propertiesproperties= new Properties();

42	Enumerationnames=context.getInitParameterNames();

43	while (names.hasMoreElements()){

44	Stringname=(String)names.nextElement();

45	Stringvalue=context.getInitParameter(name);

47	if (name.equals(XML_FILE_PROPERTY)){

try

49	Filefile= new File(value);

50	if (file.isAbsolute()){

51	JAXPConfigurator.configure(value, false );

else

53	JAXPConfigurator.configure(appDir+File.separator+value, false );

55	} catch (ProxoolExceptione){

56	LOG.error( "Problemconfiguring" +value,e);

58	} else if (name.equals(PROPERTY_FILE_PROPERTY)){

try

60	Filefile= new File(value);

61	if (file.isAbsolute()){

62	PropertyConfigurator.configure(value);

else

64	PropertyConfigurator.configure(appDir+File.separator+value);

66	} catch (ProxoolExceptione){

67	LOG.error( "Problemconfiguring" +value,e);

69	} else if (name.equals(AUTO_SHUTDOWN_PROPERTY)){

70	autoShutdown=Boolean.valueOf(value).booleanValue();

71	} else if (name.startsWith( "jdbc" )){ //此处以前是PropertyConfigurator.PREFIX改为jdbc,因为此源码是0.9.1版本的,与0.9RC3版本有点不一样

72	properties.setProperty(name,value);

76	if (properties.size()> 0 ){

try

78	PropertyConfigurator.configure(properties);

79	} catch (ProxoolExceptione){

80	LOG.error( "Problemconfiguringusinginitproperties" ,e);

然后web.xml中的配置如下：

1	< context-param >

2	< param-name >xmlFile</ param-name >

3	< param-value >WEB-INF/proxool.xml</ param-value >

4	</ context-param >

获取数据源连接代码：

viewsourceprint?

01	import java.sql.Connection;

02	import java.sql.DriverManager;

03	import java.sql.SQLException;

05	public class DBConnectionManager{

06	private static Connectionconn;

07	public static ConnectiongetConnection()

try

11	conn=DriverManager.getConnection( "proxool.数据源名" );

12	if (conn== null )

14	throw new SQLException( "数据库无值" );

18	catch (Exceptionex)

20	System.out.println(ex.getMessage());

21	ex.printStackTrace();

24	return conn;

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