java oracle 连接错误 谢谢解答!!

yaowu

一下为员代码,编译通过:
import java.sql.*;

class test
{
public static void main (String args [])
throws SQLException
{
// Load the Oracle JDBC driver
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
/* try{
Class.forName("oracle.jdbc.driver.OracleDriver";
}catch(Exception e){
System.out.println("No Driver!";
}
*/
// Connect to the database
// You must put a database name after the @ sign in the connection URL.
// You can use either the fully specified SQL*net syntax or a short cut
// syntax as ::. The example uses the short cut syntax.
String url = "jdbcracle:thin202.197.237.90:1521:mydomain";
String userName = "scott";
String password = "tiger";

if (args.length > 0) url = args[0];
if (args.length > 1) userName = args[1];
if (args.length > 2) password = args[2];
System.out.println(url);
System.out.println(userName);
System.out.println(password);
Connection conn =
DriverManager.getConnection (url, userName, password);

// Create a Statement
Statement stmt = conn.createStatement ();

// Select the ENAME column from the EMP table
ResultSet rset = stmt.executeQuery ("select * from Test";

// Iterate through the result and print the employee names
while (rset.next ())
System.out.println (rset.getString (1));
}
}

错误提示:
Exception in thread "main" java.sql.SQLException: Io 异常: The Network Adapter c ould not establish the connection
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java :125)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java :162)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java :274)
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:322)
        at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java: 347)
        at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:150)
        at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtensio n.java:32)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:549)
        at java.sql.DriverManager.getConnection(DriverManager.java:525)
        at java.sql.DriverManager.getConnection(DriverManager.java:171)
        at test.main(test.java:31)
给点建议呀!!

yaowu

我已经找到原因了，没有打开监听进程！！！