自己的一个JFinal插件--TomcatJDBCPlugin

package org.gentoo.plugin;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.tomcat.jdbc.pool.PoolProperties;

import com.jfinal.plugin.IPlugin;
import com.jfinal.plugin.activerecord.IDataSourceProvider;
import com.jfinal.util.StringKit;

/**
 * 本插件是作为Tomcat7 中自带数据源的插件
 * @author gentoo
 *
 */
public class TomcatDataSourcePlugin implements IPlugin, IDataSourceProvider
{
	/**
	 * JDBC连接路径
	 */
	private String jdbcUrl;
	
	/**
	 * 用户名
	 */
	private String user;
	
	/**
	 * 密码
	 */
	private String password;

	/**
	 * 最大连接数
	 */
	private int maxActive = 100;
	
	/**
	 * 初始连接条数
	 */
	private int initialSize = 10;
	
	/**
	 * 最长等待时间
	 */
	private int maxWait = 10000;
	
	/**
	 * 最小空闲时间
	 */
	private int minIdle = 10;

	/**
	 * 默认的驱动名称
	 */
	private String driverClass = "com.mysql.jdbc.Driver";

	/**
	 * Tomcat中的JDBC数据源对象
	 */
	private org.apache.tomcat.jdbc.pool.DataSource jdbcDatasources;

	public TomcatDataSourcePlugin(PoolProperties p)
	{
		jdbcDatasources = new org.apache.tomcat.jdbc.pool.DataSource();
		jdbcDatasources.setPoolProperties(p);

	}

	public TomcatDataSourcePlugin setDriverClass(String driverClass)
	{

		if (StringKit.isBlank(driverClass))
			throw new IllegalArgumentException("driverClass can not be blank.");
		this.driverClass = driverClass;
		return this;
	}

	public TomcatDataSourcePlugin(String jdbcUrl, String user, String password)
	{

		this.jdbcUrl = jdbcUrl;
		this.user = user;
		this.password = password;
	}

	public TomcatDataSourcePlugin(String jdbcUrl, String user, String password, String driverClass)
	{

		this.jdbcUrl = jdbcUrl;
		this.user = user;
		this.password = password;
		this.driverClass = driverClass != null ? driverClass : this.driverClass;
	}

	public TomcatDataSourcePlugin(String jdbcUrl, String user, String password, String driverClass, Integer maxActive, Integer initialSize, Integer maxWait, Integer minIdle)
	{

		initTomcatDataSourcePlugin(jdbcUrl, user, password, driverClass, maxActive, initialSize, maxWait, minIdle);
	}

	private void initTomcatDataSourcePlugin(String jdbcUrl, String user, String password, String driverClass, Integer maxActive, Integer initialSize, Integer maxWait, Integer minIdle)
	{

		this.jdbcUrl = jdbcUrl;
		this.user = user;
		this.password = password;
		this.driverClass = driverClass != null ? driverClass : this.driverClass;
		this.maxActive = maxActive != null ? maxActive : this.maxActive;
		this.initialSize = initialSize != null ? initialSize : this.initialSize;
		this.maxWait = maxWait != null ? maxWait : this.maxWait;
		this.minIdle = minIdle != null ? minIdle : this.minIdle;
	}

	public TomcatDataSourcePlugin(Properties properties)
	{

		Properties ps = properties;
		initTomcatDataSourcePlugin(ps.getProperty("jdbcUrl"), ps.getProperty("user"), ps.getProperty("password"), ps.getProperty("driverClass"), toInt(ps.getProperty("maxActive")), toInt(ps.getProperty("initialSize")), toInt(ps.getProperty("maxWait")), toInt(ps.getProperty("minIdle")));
	}

	private Integer toInt(String str)
	{
		return Integer.parseInt(str);
	}

	public DataSource getDataSource()
	{

		return jdbcDatasources;
	}

	public boolean start()
	{
		PoolProperties p = new PoolProperties();
		p.setUrl(jdbcUrl);
		p.setDriverClassName(driverClass);
		p.setUsername(user);
		p.setPassword(password);
		p.setJmxEnabled(true);
		p.setTestWhileIdle(false);
		p.setTestOnBorrow(true);
		p.setValidationQuery("SELECT 1");
		p.setTestOnReturn(false);
		p.setValidationInterval(30000);
		p.setTimeBetweenEvictionRunsMillis(30000);
		p.setRemoveAbandonedTimeout(60);
		p.setMinEvictableIdleTimeMillis(30000);
		p.setLogAbandoned(true);
		p.setRemoveAbandoned(true);
		p.setJdbcInterceptors("org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;" + "org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer");
		p.setMinIdle(minIdle);
		p.setMaxActive(maxActive);
		p.setInitialSize(initialSize);
		p.setMaxWait(maxWait);
		
		jdbcDatasources = new org.apache.tomcat.jdbc.pool.DataSource();
		jdbcDatasources.setPoolProperties(p);
		
		return true;
	}

	public boolean stop()
	{
		if (jdbcDatasources != null)
		{
			jdbcDatasources.close();
		}
		return true;
	}

}
使用方法 ：

	@Override
	public void configPlugin(Plugins me)
	{
		//添加数据源
		TomcatDataSourcePlugin tomcatDataSourcePlugin= new TomcatDataSourcePlugin(getProperty("jdbc.url"), getProperty("jdbc.username"), getProperty("jdbc.password").trim());
		
		me.add(tomcatDataSourcePlugin);
		
		ActiveRecordPlugin arp = new ActiveRecordPlugin(tomcatDataSourcePlugin);
		arp.setShowSql(true);
		me.add(arp);
	}

注：这个代码是仿C3p0里的插件的代码的。呵呵，在此特别注明一下。不过自己还是挺有成就感的。
呵呵。也体会到插件式的软件及框架的优秀性--没有的东西，你自己可以实现一个。哈哈。在此特别纪念一下。
 注：必须是在Tomcat7.x或以上中使用。呵呵 。