我使用sqlplus和PLSQLDeveloper连接本地数据库都没有问题，但是使用JDBC就连接不上了，不知道哪里问题。请懂的人指教下，感激不尽！

public class ConnectionFactory {
	private static BasicDataSource bds;
	private static String driverClassName = "oracle.jdbc.driver.OracleDriver";
	private static String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	private static String username = "fcs";
	private static String password = "123";
	private ConnectionFactory(){

	}
	public static BasicDataSource getBs(){
		if(null == bds){
			bds = new BasicDataSource();
			bds.setDriverClassName(driverClassName);
			bds.setUrl(url);
			bds.setUsername(username);
			bds.setPassword(password);
			bds.setMaxActive(10);
		}
		return bds;
	}
	public static void main(String[] args) {
		try {
			System.out.println(ConnectionFactory.getBs().getConnection().isClosed());
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}

报错
org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Io exception: The Network Adapter could not establish the connection)
at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at com.wistron.DB.ConnectionFactory.main(ConnectionFactory.java:30)
Caused by: java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:334)
at oracle.jdbc.ttc7.TTC7Protocol.handleIOException(TTC7Protocol.java:3678)
at oracle.jdbc.ttc7.TTC7Protocol.logon(TTC7Protocol.java:352)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:365)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:547)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:347)
at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1556)
at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1545)
… 3 more