proxool的使用总结

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：

<?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