jdbc连接池配置

/**

访问数据库的相关参数写入src下的config.properties

**/
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Locale;
import java.util.ResourceBundle;

import org.apache.commons.dbcp.ConnectionFactory;
import org.apache.commons.dbcp.DriverManagerConnectionFactory;
import org.apache.commons.dbcp.PoolableConnectionFactory;
import org.apache.commons.dbcp.PoolingDriver;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.GenericObjectPool;

@SuppressWarnings("unchecked")
public class PoolManager
{
 private static String  driver  = null; // 驱动
 private static String  url   = null; // URL
 private static String  name   = null; // 用户名
 private static String  password  = null; // 密码
 private static Class  driverClass = null;
 private static ObjectPool connectionPool = null;
 private static String  poolname  = null;
 private static ResourceBundle rb;
 
 /**
  * 初始化数据源
  */
 private static synchronized void initDataSource()
 {
  if(driverClass == null)
  {
   try
   {
    driverClass = Class.forName (driver);
   }catch (ClassNotFoundException e)
   {
    e.printStackTrace ();
   }
  }
 }
 
 /**
  * 装配配置文件 initProperties
  */
 private static void loadProperties()
 {
  rb = ResourceBundle.getBundle ("config",Locale.getDefault ());;
  driver = rb.getString ("dataSource.driver");
  url = rb.getString ("dataSource.jdbcUrl");
  name = rb.getString ("dataSource.user");
  password = rb.getString ("dataSource.password");
  poolname = rb.getString ("dataSource.poolname");
 }
 
 /**
  * 连接池启动
  */
 public static void StartPool()
 {
  loadProperties ();
  initDataSource ();
  if(connectionPool != null)
  {
   ShutdownPool ();
  }
  try
  {
   connectionPool = new GenericObjectPool (null);
   ConnectionFactory connectionFactory = new DriverManagerConnectionFactory (
    url,name,password);
   new PoolableConnectionFactory (connectionFactory,connectionPool,
    null,null,false,true);
   Class.forName ("org.apache.commons.dbcp.PoolingDriver");
   PoolingDriver driver = (PoolingDriver) DriverManager.getDriver ("jdbc:apache:commons:dbcp:");
   driver.registerPool (poolname,connectionPool);
   System.out.println ("装配连接池OK");
  }catch (Exception e)
  {
   e.printStackTrace ();
  }
 }
 
 /**
  * 释放连接池
  */
 public static void ShutdownPool()
 {
  try
  {
   PoolingDriver driver = (PoolingDriver) DriverManager.getDriver ("jdbc:apache:commons:dbcp:");
   driver.closePool (poolname);
  }catch (SQLException e)
  {
   e.printStackTrace ();
  }
 }
 
 /**
  * 取得连接池中的连接
  */
 public static Connection getConnection()
 {
  Connection conn = null;
  if(connectionPool == null)
   StartPool ();
  try
  {
   conn = DriverManager.getConnection ("jdbc:apache:commons:dbcp:"
    + poolname);
  }catch (SQLException e)
  {
   e.printStackTrace ();
  }
  return conn;
 }
 
 /**
  * 获取连接 getConnection
  *
  * @param name
  */
 public static Connection getConnection(String name)
 {
  return getConnection ();
 }
 
 /**
  * 释放连接 freeConnection
  *
  * @param conn
  */
 public static void freeConnection(Connection conn)
 {
  if(conn != null)
  {
   try
   {
    conn.close ();
   }catch (SQLException e)
   {
    e.printStackTrace ();
   }
  }
 }
 
 /**
  * 释放连接 freeConnection
  *
  * @param name
  * @param con
  */
 public static void freeConnection(String name, Connection con)
 {
  freeConnection (con);
 }
 
 /**
  * 例子 main
  *
  * @param args
  */
 public static void main(String [] args)
 {
  try
  {
   Connection conn = PoolManager.getConnection ();
   System.out.println (conn.isClosed ());
   if(conn != null)
   {
    Statement statement = conn.createStatement ();
    ResultSet rs = statement.executeQuery ("select * from test2..log");
    int c = rs.getMetaData ().getColumnCount ();
    while (rs.next ())
    {
     System.out.println ();
     for (int i = 1;i <= c;i++ )
     {
      System.out.print (rs.getObject (i));
     }
    }
    rs.close ();
   }
   PoolManager.freeConnection (conn);
  }catch (SQLException e)
  {
   e.printStackTrace ();
  }
  
 }
 
}