连接oracle数据库 账号和密码是全大写 会报连接出错问题(因为oracle帐号都是小写的所以会出现这个问题，所以 帐号 如果创建是小写的 话连接名最好小写，因为oracle登录有区分大小写)
java.sql.SQLException: ORA-01017: invalid username/password; logon denied
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:305)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:272)
at oracle.jdbc.driver.T4CTTIoauthenticate.receiveOauth(T4CTTIoauthenticate.java:648)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:308)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:348)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:151)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:563)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at DB.masDataBaseConnection.<init>(masDataBaseConnection.java:17)
at DB.test.sendMessage(test.java:24)
at DB.test.main(test.java:16)
java.lang.NullPointerExceptionthis.conn2null
at DB.test.sendMessage(test.java:29)
at DB.test.main(test.java:16)
or