DBCP连接池的最简单应用(用于ORACLE数据库)
鉴于有人问起DBCP直接用于JDBC连接的问题，我做了一个最简单的示例。所有资源来源于网上。它不需要什么Web容器，就是一简单的控制台应用。

资源：
http://apache.etoak.com//commons/pool/binaries/commons-pool-1.5.6-bin.zip
http://labs.renren.com/apache-mirror//commons/dbcp/binaries/commons-dbcp-1.4-bin.zip
http://download.java.net/maven/1/javaee/jars/javaee-api-5.jar
当然，还有oracle jdbc要用的ojdbc14.jar (适用于oracle9i及以上版本)

工程文件：放到这里了。http://dl.iteye.com/topics/download/210279f0-f752-37a6-969f-d58ba13cc394

数据库连接信息：
jdbc:oracle:thin:scott/tiger@sean-m700:1521:ora92
sean-m700是主机名，ora92是oracle数据库的instance ID. 我手头的机器上没有安装oracle数据库，用的是很早以前的一个oracle9.2的拷贝，重新安装实例和相应服务得来的。

源码如下：借化献佛，源码也是从网上得来的。(http://svn.apache.org/viewvc/commons/proper/dbcp/trunk/doc/BasicDataSourceExample.java?revision=1100136&view=markup)

/*//33  // Here's a simple example of how to use the BasicDataSource.34  //35  36  //37  // Note that this example is very similiar to the PoolingDriver38  // example.39  40  //41  // To compile this example, you'll want:42  //  * commons-pool-1.5.6.jar43  //  * commons-dbcp-1.3.jar (JDK 1.4-1.5) or commons-dbcp-1.4 (JDK 1.6+)44  //  * j2ee.jar (for the javax.sql classes)45  // in your classpath.46  //47  // To run this example, you'll want:48  //  * commons-pool-1.5.6.jar49  //  * commons-dbcp-1.3.jar (JDK 1.4-1.5) or commons-dbcp-1.4 (JDK 1.6+)50  //  * j2ee.jar (for the javax.sql classes)51  //  * the classes for your (underlying) JDBC driver52  // in your classpath.53  //54  // Invoke the class using two arguments:55  //  * the connect string for your underlying JDBC driver56  //  * the query you'd like to execute57  // You'll also want to ensure your underlying JDBC driver58  // is registered.  You can use the "jdbc.drivers"59  // property to do this.60  //61  // For example:62  //  java -Djdbc.drivers=oracle.jdbc.driver.OracleDriver \63  //       -classpath commons-pool-1.5.6.jar:commons-dbcp-1.4.jar:j2ee.jar:oracle-jdbc.jar:. \64  //       PoolingDataSourceExample65  //       "jdbc:oracle:thin:scott/tiger@myhost:1521:mysid"66  //       "SELECT * FROM DUAL"*//*The Oracle connection URL for the thin client-side driver ojdbc14.jar has the following format:jdbc:oracle:thin:[user/password]@[host][:port]:SIDjdbc:oracle:thin:[user/password]@//[host][:port]/SID  user - The login user name defined in the Oracle server.  password - The password for the login user.  host - The host name where Oracle server is running.          Default is 127.0.0.1 - the IP address of localhost.  port - The port number where Oracle is listening for connection.         Default is 1521.  SID  - System ID of the Oracle server database instance.          SID is a required value. By default, Oracle Database 10g Express          Edition creates one database instance called XE.*/import org.apache.commons.dbcp.BasicDataSource;import javax.sql.*;import java.sql.*;public class TestDataSource{    /**     * @param args     */    public static void main(String[] args)    {        System.out.println("Setting up data source.");        String url = "jdbc:oracle:thin:scott/tiger@sean-m700:1521:ora92";        DataSource dataSource = setupDataSource(url);        System.out.println("Done...");        // Now, we can use JDBC DataSource as we normally would.        //        Connection conn = null;        Statement stmt = null;        ResultSet rset = null;        try {            System.out.println("Creating connection.");            conn = dataSource.getConnection();            System.out.println("Creating statement.");            stmt = conn.createStatement();            System.out.println("Executing statement.");            rset = stmt.executeQuery("select 1 from DUAL");            System.out.println("Results:");            int numcols = rset.getMetaData().getColumnCount();            while(rset.next()) {                for(int i=1;i<=numcols;i++) {                    System.out.print("\t" + rset.getString(i));                }                System.out.println("");            }        } catch(SQLException e) {            e.printStackTrace();        } finally {            try { if (rset != null) rset.close(); } catch(Exception e) { }            try { if (stmt != null) stmt.close(); } catch(Exception e) { }            try { if (conn != null) conn.close(); } catch(Exception e) { }        }    }    public static DataSource setupDataSource(String connectURI) {        BasicDataSource ds = new BasicDataSource();        ds.setDriverClassName("oracle.jdbc.driver.OracleDriver");        ds.setUsername("scott");        ds.setPassword("tiger");        ds.setUrl(connectURI);        return ds;    }    public static void printDataSourceStats(DataSource ds) {        BasicDataSource bds = (BasicDataSource) ds;        System.out.println("NumActive: " + bds.getNumActive());        System.out.println("NumIdle: " + bds.getNumIdle());    }    public static void shutdownDataSource(DataSource ds) throws SQLException {        BasicDataSource bds = (BasicDataSource) ds;        bds.close();    }}