求 java java.sql.SQLException:The Network Adapter could not e

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求 java java.sql.SQLException:The Network Adapter could not establish the connection
我写了一个链接 oracle 的servlet 小程序,报的上面的错 ,然后我再写个测试的 JDBC 程序,都能通过 ,能打印出数据库中的内容,测试没问题.为什么servlet 访问的时候后台 tomcat 就报上面这个错啊,tomcat 6.0 不行,我试了 5.0 也不行
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl","scott","orcl");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from tb_agent_ofr");
} 大概就这这样了 ,我做了JDBC 测试能通的

("jdbc:oracle:thin:@localhost:1521:ORCL","scott","tiger"); 这行出错了,你看看你数据库实例用户名密码写错了没

求 java java.sql.SQLException:The Network Adapter could not e java.sql.SQLException:IO 错误:The Network Adapter could not es java.sql.SQLException:Io 异常:The Network Adapter could not es java.sql.SQLException:Operation not allowed after ResultSet java.sql.SQLException:The transaction is no longer active-st java.sql.SQLException:Couldn't perform the operation prepare java.sql.SQLException: Listener refused the connection with java.sql.SQLException:Listener refused the connection with t 具体信息如下：java.sql.SQLException:Listener refused the connection java.sql.SQLException:ORA-00917:缺失逗号 java 连接oracle报错java.sql.SQLException: Listener refused the c java.sql.SQLException:ORA-28000:the account is locked?怎么解决