遇到的IO异常问题
背景：启动服务时，在启动日志中报错
The Network Adapter could not establish the connection
网络适配器无法建立连接
原因：项目配置的oracle数据库未启动，不能成功链接到oracle数据库
因为切换数据库的原因，原数据库关闭并切换成其他地址的数据库导致无法链接到原来的数据库
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