用JAVA连接oracle8.1.6的错误！

[whlusha]

用的eclipse3.2 + MyEclipse5.5

java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection
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:334)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:418)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:521)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:325)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.spume.logic.VenditionGather.qryData(VenditionGather.java:75)
at com.spume.logic.VenditionGather.main(VenditionGather.java:131)

Connection conn = null;
		//连接字符串格式： "jdbc:数据库驱动名称:连接模式:@数据库服务器ip:端口号:数据库SID" 
		String url = "jdbc:oracle:thin:@localhost:1521:XXGW";
		String username = "green";
		String password = "light";
		try {
			//创建oracle数据库驱动实例
//			oracle.jdbc.driver.OracleDriver
			Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
			//获得与数据库的连接 
			conn = DriverManager.getConnection(url,username,password);
			//创建执行语句对象
			Statement stmt = conn.createStatement(); 
			//执行sql语句,返回结果集
			ResultSet rs = stmt.executeQuery(sql);

用PL/SQL可以登陆ORACLE classes12.jar包也导入工程了 想知道错误在哪？

[QUERY123123]

你的CLASS12是在oracle8.1.6下拷贝的吗？？？？
不是的话，换一下。
是的话。无话.

[panxuan]

网络适配器无法建立连接

[whlusha]

原来是classes12包的问题
现在已经解决了 谢谢大家