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1.普通SID方式
jdbc:oracle:thin:username/password@x.x.x.1:1521:SID
2.普通ServerName方式

jdbc:oracle:thin:username/password@//x.x.x.1:1522/ABCD
3.RAC方式
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=x.x.x.1)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=x.x.x.2)(PORT=1521)))(LOAD_BALANCE=yes)(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=xxrac)))