jdbc连接oracle的连接串如下：

String url="jdbc:oracle:thin:@(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = host2)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = host1)(PORT = 1521))
(LOAD_BALANCE = yes)(FAILOVER = ON)
(CONNECT_DATA =(SERVER = DEDICATED)
(SERVICE_NAME = db.domain)
(FAILOVER_MODE=(TYPE = SELECT)(METHOD = BASIC)(RETIRES = 20)(DELAY = 15))))";

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假定有以下 Oracle RAC 配置：
  Sid = slrac
SLRAC = 

  (DESCRIPTION = 
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.231)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.230)(PORT = 1521))
      (LOAD_BALANCE = yes) 
    )

    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = slrac.beta.com)
      (FAILOVER_MODE =
        (TYPE = SELECT)
        (METHOD = BASIC)
        ) 
      )
    )

 SLRAC2 =
   (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.230)(PORT = 1521))
    )
     (CONNECT_DATA =
      (SERVICE_NAME = slrac.beta.com) 
       (INSTANCE_NAME = slrac2) 
     )
   )  SLRAC1 =
     (DESCRIPTION =
     (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.231)(PORT = 1521)) 
      )
      (CONNECT_DATA =
      (SERVICE_NAME = slrac.beta.com)
      (INSTANCE_NAME = slrac1)
      )
    )

则JDBC URL 的配置如下：

jdbc:oracle:thin:@(description=(address_list= (address=(host=192.168.1.231) (protocol=tcp)(port=1521))(address=(host=192.168.1.230)(protocol=tcp) (port=1521)) (load_balance=yes)(failover=yes))(connect_data=(service_name= slrac.beta.com)))

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? java测试程序如下：

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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class Test {

public static void main(String arg[]) {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
String url="jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = host1)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = host2)(PORT = 1521))(LOAD_BALANCE = yes)(FAILOVER = ON)(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = db.domain)(FAILOVER_MODE=(TYPE = SELECT)(METHOD = BASIC)(RETIRES = 20)(DELAY = 15))))";
Connection c = DriverManager.getConnection(url,"aa","aa");
Statement s = c.createStatement();
ResultSet r = s.executeQuery("select 1 from dual");
while(r.next()) {
System.out.println(r.getString(1));
}
}catch(Exception e) {
System.out.println(e.toString());
}
}
}