Question

Exception in thread "main" java.sql.SQLException:Io 异常

classes12.jar我也导入了
oracle6.jar我也导入了怎么回事啊

代码如下：
import java.sql.*;

public class jdbc {

/**
* @param args
* @throws SQLException
*/
public static void main(String[] args) {
String url="jdbc:oracle:thin:@localhost:1521:ora9";
String user="scott";
String password="tiger";
try {
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
} catch (InstantiationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalAccessException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

try {
Connection conn= DriverManager.getConnection(url,user,password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}
敬请高手解答
异常如下：
java.sql.SQLException: Io 异常: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=153092352)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))
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:333)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:404)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:468)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:314)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at jdbc.main(jdbc.java:28)

Answer 1

连接被拒绝，你试一试用其他客户端能否连到Oracle
例如 PL/SQL Developer 或 Toad啥的

Answer 2

连接数据库被拒绝，
看一下url地址,账号和密码以及数据库名是不是正确