出现问题：
我的代码是通过本机eclipse访问电脑虚拟机安装的oracle数据库数据，出现了Io 异常: The Network Adapter could not establish the connection，这个异常是由于ui端接口发送数据进行接口访问时出现的。
处理过程：
1.修改虚拟机oracle监听配置，配置listener和tnsnames文件，这两个文件在db_home2中，不是在db_home1中，一定要注意。
2.配置了监听的主机名，一定是主机名不然没法访问，具体如下图所示。
3.修改eclipse中的application.yml文件中的连接，改成了： host：端口：SID，，在这里host是我的主机名（主机名通过计算机属性查看，后面一般带有-PC），端口是1521，注意是SID不是全局数据库名。
listener配置文件：
# listener.ora Network Configuration File: C:\app\st\product\11.2.0\dbhome_2\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\st\product\11.2.0\dbhome_2)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\app\st\product\11.2.0\dbhome_2\bin\oraclr11.dll")
)
)
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = st-PC)(PORT = 1521))
)
ADR_BASE_LISTENER = C:\app\st
tnsnames配置文件：
# tnsnames.ora Network Configuration File: C:\app\st\product\11.2.0\dbhome_2\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.
LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.80.3)(PORT = 1521))
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(Key = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = st-PC)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl.168.153.154)
)
)
SQLNET配置文件：
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
监听配置：
application.yml文件配置：
注意：文件配置严格按照格式来，只能是用空格键，不能使用tab键。
spring:
datasource:
url : jdbc:oracle:thin:@st-PC:1521:ORCL
username: SCOTT
password: st
driver-class-name: oracle.jdbc.OracleDriver
mybatis:
mapperLocations :
classpath:mapper/*Mapper.xml