使用DBCP必须用的三个包：
commons-dbcp-1.2.1.jar, commons-pool-1.2.jar, commons-collections-3.1.jar。
配置参数。
Java API: BasicDataSourceFactory.createDataSource(properties);
package cn.itcast.jdbc;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.commons.dbcp.BasicDataSourceFactory;
import cn.itcast.jdbc.datasource.MyDataSource2;
public final class JdbcUtils {
private static String url = "jdbc:mysql://localhost:3306/jdbc";
private static String user = "root";
private static String password = "";
private static DataSource myDataSource = null;
private JdbcUtils() {
}
static {
try {
Class.forName("com.mysql.jdbc.Driver");
// myDataSource = new MyDataSource2();
Properties prop = new Properties();
// prop.setProperty("driverClassName", "com.mysql.jdbc.Driver");
// prop.setProperty("user", "user");
InputStream is = JdbcUtils.class.getClassLoader()
.getResourceAsStream("dbcpconfig.properties");
prop.load(is);
myDataSource = BasicDataSourceFactory.createDataSource(prop);//工厂模式，创建数据源
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
}
public static DataSource getDataSource() {
return myDataSource;
}
public static Connection getConnection() throws SQLException {
// return DriverManager.getConnection(url, user, password);
return myDataSource.getConnection();
}
public static void free(ResultSet rs, Statement st, Connection conn) {
try {
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (st != null)
st.close();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (conn != null)
try {
conn.close();
// myDataSource.free(conn);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}