1.Application 启动类加注解
@PropertySource(value = { "classpath:application.properties", "file:./config/application.properties" }, ignoreResourceNotFound = true)
读取顺序，先找classpath 下application.properties 如果找不到读同级/config/application.properties
2.src 同级目录新建 config文件夹并放入application.properties 配置文件