proxool的使用总结
2013-02-25 14:09
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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:
然后在web.xml文件中进行配置,添加如下代码:
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.***.com,那么数据源监控URL为:www.***.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: Attempt to refer to a unregistered pool by its alias ‘别名’或者java.sql.SQLException: No suitable driver found for '数据源名'这时的解决方案为把proxool交给监听器进行处理:
然后web.xml中的配置如下:
获取数据源连接代码:
转自:51cto.comarticle-5496-1.html
添加jar包:proxool-0.9.0RC3.jar 在WEB-INF下,创建proxool.xml文件,代码如下:
<?xml version="1.0" encoding="UTF-8"?> <!-- the proxool configuration can be embedded within your own application's. Anything outside the "proxool" tag is ignored. --> <something-else-entirely> <proxool> <alias>数据源名</alias> <driver-url>jdbc:mysql://localhost:3306/数据库名</driver-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <driver-properties> <property name="user" value="用户名"/> <property name="password" value="密码"/> <property name="useUnicode" value="true"/> <property name="characterEncoding" value="UTF-8"/> </driver-properties> <house-keeping-sleep-time>40000</house-keeping-sleep-time> <maximum-connection-count>250</maximum-connection-count> <minimum-connection-count>3</minimum-connection-count> <maximum-connection-lifetime>3000000</maximum-connection-lifetime> <!-- 5 hours --> <simultaneous-build-throttle>5</simultaneous-build-throttle> <recently-started-threshold>400000</recently-started-threshold> <overload-without-refusal-lifetime>500000</overload-without-refusal-lifetime> <maximum-active-time>600000</maximum-active-time> <verbose>true</verbose> <trace>true</trace> <house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql> <fatal-sql-exception>Fatal error</fatal-sql-exception> <prototype-count>2</prototype-count> <statistics-log-level>INFO</statistics-log-level> </proxool> </something-else-entirely>
然后在web.xml文件中进行配置,添加如下代码:
<servlet> <servlet-name>ServletConfigurator</servlet-name> <servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class> <init-param> <param-name>xmlFile</param-name> <param-value>WEB-INF/proxool.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- <servlet> <servlet-name>Admin</servlet-name> <servlet-class>org.logicalcobwebs.proxool.admin.servlet.AdminServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Admin</servlet-name> <url-pattern>/admin</url-pattern> </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.***.com,那么数据源监控URL为:www.***.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: Attempt to refer to a unregistered pool by its alias ‘别名’或者java.sql.SQLException: No suitable driver found for '数据源名'这时的解决方案为把proxool交给监听器进行处理:
import java.io.File; import java.util.Enumeration; import java.util.Properties; import javax.servlet.ServletContext; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.logicalcobwebs.proxool.ProxoolException; import org.logicalcobwebs.proxool.configuration.JAXPConfigurator; import org.logicalcobwebs.proxool.configuration.PropertyConfigurator; public class ProxoolListener implements ServletContextListener { private static final Log LOG = LogFactory.getLog(ProxoolListener.class); private static final String XML_FILE_PROPERTY = "xmlFile"; private static final String PROPERTY_FILE_PROPERTY = "propertyFile"; private static final String AUTO_SHUTDOWN_PROPERTY = "autoShutdown"; @SuppressWarnings("unused") private boolean autoShutdown = true; public void contextDestroyed(ServletContextEvent arg0) { System.out.println("destroy database pool...."); } @SuppressWarnings("unchecked") public void contextInitialized(ServletContextEvent contextEvent) { System.out.println("init................"); //对应servlet的init方法中ServletConfig.getServletContext() ServletContext context = contextEvent.getServletContext(); String appDir = contextEvent.getServletContext().getRealPath("/"); Properties properties = new Properties(); Enumeration names = context.getInitParameterNames(); while (names.hasMoreElements()) { String name = (String) names.nextElement(); String value = context.getInitParameter(name); if (name.equals(XML_FILE_PROPERTY)) { try { File file = new File(value); if (file.isAbsolute()) { JAXPConfigurator.configure(value, false); } else { JAXPConfigurator.configure(appDir + File.separator + value, false); } } catch (ProxoolException e) { LOG.error("Problem configuring " + value, e); } } else if (name.equals(PROPERTY_FILE_PROPERTY)) { try { File file = new File(value); if (file.isAbsolute()) { PropertyConfigurator.configure(value); } else { PropertyConfigurator.configure(appDir + File.separator + value); } } catch (ProxoolException e) { LOG.error("Problem configuring " + value, e); } } else if (name.equals(AUTO_SHUTDOWN_PROPERTY)) { autoShutdown = Boolean.valueOf(value).booleanValue(); } 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 properties.setProperty(name, value); } } if (properties.size() > 0) { try { PropertyConfigurator.configure(properties); } catch (ProxoolException e) { LOG.error("Problem configuring using init properties", e); } } } }
然后web.xml中的配置如下:
<context-param> <param-name>xmlFile</param-name> <param-value>WEB-INF/proxool.xml</param-value> </context-param>
获取数据源连接代码:
try{ Class.forName("org.logicalcobwebs.proxool.ProxoolDriver"); Connection con = DriverManager.getConnection("proxool.xml-test"); // Connection con = DriverManager.getConnection("proxool.property-test"); return con; }catch(Exception e){}
转自:51cto.comarticle-5496-1.html
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