Oracle10G thin 管理员 权限 登陆 问题

1.使用sys，无法连接。

String u = "sys" ;
String p = "fducs" ;        
String url = "jdbc:oracle:thin:@localhost:1521:fdu" ;

try {
                        Class.forName("oracle.jdbc.driver.OracleDriver" );
                        System.out.println("Driver loaded" );
} catch (ClassNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
}

try {
                        con = DriverManager.getConnection(url, u, p);
                        System.out.println("Database connected" );
} catch (SQLException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
}

抛出异常：
java.sql.SQLException: ORA-28009: connection to sys should be as sysdba or sysoper

2.使用system as sysdba无法连接

String url = "jdbc:oracle:thin:@localhost:1521:fdu" ;

try {
        Class.forName("oracle.jdbc.driver.OracleDriver" );
        System.out.println("Driver loaded" );
} catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
}

Properties     prop     =     new      Properties();    
prop.put("user" ,"system" );    
prop.put("password" ,"fducs" );    
prop.put("defaultRowPrefetch" , "15" );    
prop.put("internal_logon" ,     "sysdba" );
try {
           con= DriverManager.getConnection(url, prop);
           System.out.println("Database connected" );
} catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
}

抛出异常：
java.sql.SQLException: ORA-01017: invalid username/password; logon denied

由此可见JDBC Thin连接Oracle只能以normal方式.应该是考虑安全性，实际中并不需要以sysdba身份从客户端连接到oracle数据库，应该采用别的授权用户