jdbc連接oracle時報錯 Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableC

錯誤：

 Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

Last packet sent to the server was 0 ms ago.)

解決方法：1、注意驅動包是否正確 驅動類的名字：oracle.jdbc.driver.OracleDriver

                   2、JDBC URL：jdbc:oracle:thin:@dbip:port:databasename

                             dbip –為數據庫服務器的IP地址，如果是本地可寫：localhost或127.0.0.1。

                             port –為數據庫的監聽端口，需要看安裝時的配置，缺省為1521。

                           databasename –為數據庫的SID，通常為全局數據庫的名字。

                        舉例如果要訪問本地的數據庫aaaa，端口1521，那么URL寫法如下：
                              jdbc:oracle:thin:@localhost:1521:aaaa

                   3、username和password 在properties文件中和xml文件中一定要對應上