jdbc连接oracle11g数据库 报错。 求找错！！
java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at org.accp.test.Test.main(Test.java:19)



代码： 

static Connection conn; 
static PreparedStatement stm; 
static ResultSet rs; 
static String driver="oracle.jdbc.driver.OracleDriver"; 
static String url="jdbc:oracle:thin:@localhost:1521:ORCL"; 
public static void main(String[] args) { 
try { 
Class.forName(driver); 
Connection ct = DriverManager.getConnection(url, "us", "us"); 
String sql="select * from person";
stm = ct.prepareStatement(sql); 
  rs=stm.executeQuery();
while(rs.next()) 
{ 
System.out.println("用户名："+rs.getString(1)); 
} 
} catch (ClassNotFoundException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} catch (SQLException e) { 
// TODO Auto-generated catch block 
e.printStackTrace();
  }
}

------解决方案--------------------
static String url="jdbc:oracle:thin:@localhost:1521:ORCL"; 

localhost 换成计算机名？