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在尝试使用 java 8 中的 jdbc 连接到 oracle 18c 时，使用

"Class.forName("oracle.jdbc.driver.OracleDriver"); cn=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE","PL","PL"); "

我收到 2 个异常“原因：oracle.net.ns.NetException：侦听器拒绝连接并出现以下错误：ORA-12505，TNS：侦听器当前不知道连接描述符中给出的 SID”“java.sql.SQLException：侦听器拒绝连接并出现以下错误：ORA-12505，TNS：侦听器当前不知道连接描述符中给出的 SID”

我尝试在 CMD 中执行“lsnrctl status”和“lsnrctl services”并且还检查了“D:\db_home\dbhomeXE\network\admin\tnsnames.ora”文件和“D:\db_home\dbhomeXE\network\admin\listener.ora” "

tnsnames.ora

# tnsnames.ora Network Configuration File: D:\db_home\dbhomeXE\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

LISTENER_XE =
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

监听器.ora

# listener.ora Network Configuration File: D:\db_home\dbhomeXE\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.

DEFAULT_SERVICE_LISTENER = XE

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = D:\db_home\dbhomeXE)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:D:\db_home\dbhomeXE\bin\oraclr18.dll")
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

lsnrctl 服务的o/p：


Copyright (c) 1991, 2018, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0
         LOCAL SERVER
The command completed successfully```

o/p of lsnrctl status:
```LSNRCTL for 64-bit Windows: Version 18.0.0.0.0 - Production on 12-SEP-2019 01:34:23

Copyright (c) 1991, 2018, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for 64-bit Windows: Version 18.0.0.0.0 - Production
Start Date                11-SEP-2019 20:13:48
Uptime                    0 days 5 hr. 20 min. 39 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Default Service           XE
Listener Parameter File   D:\db_home\dbhomeXE\network\admin\listener.ora
Listener Log File         D:\db_home\diag\tnslsnr\DESKTOP-ARH7AVT\listener\alert\log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=DESKTOP-ARH7AVT)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully```

I'm getting 

java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

Caused by: oracle.net.ns.NetException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
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