java 代码在连接oracle时，根据oracle安装是单机还是RAC,此时jdbc的连接串或者连接方式有说不通
连接单机的配置：
jdbc.url=jdbc:oracle:thin:@
192.168.1.12:1521:orcl
连接集群的配置：
1.jdbc.url=jdbc:oracle:thin:@
192.168.1.12:1521/orcl
2.jdbc.url=jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 10.204.7.87)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = 10.204.7.89)(PORT = 1521))(FAILOVER=ON)(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = tyyj)(FAILOVER_MODE =(TYPE = SELECT)(METHOD = BASIC)(RETRIES = 180)(DEL
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