前言
继Memcached之后，考虑尝试选用Redis做缓存架构并使用分布式锁，先安装入门。
1：配置文件的优先级
spring boot 启动会扫描以下位置的application.properties或者application.yml文件作为Spring boot的默认配置文件
–file:./config/
–file:./
–classpath:/config/
–classpath:/
2：全部优先级
springboot对配置文件设置了共17个优先级，上述配置文件分别是第11到第15。全部优先级如下：
1：Devtools global settings properties on your home directory (~/.spring-boot-devtools.properties when devtools is active).
2：@TestPropertySource annotations on your tests.
3：@SpringBootTest#properties annotation attribute on your tests.
4：Command line arguments.
5：Properties from SPRING_APPLICATION_JSON (inline JSON embedded in an environment variable or system property)
6：ServletConfig init parameters.
7：ServletContext init parameters.
8：JNDI attributes from java:comp/env.
9：Java System properties (System.getProperties()).
10：OS environment variables.
11：A RandomValuePropertySource that only has properties in random.*.
12：Profile-specific application properties outside of your packaged jar (application-{profile}.properties and YAML variants)
13：Profile-specific application properties packaged inside your jar (application-{profile}.properties and YAML variants)
14：Application properties outside of your packaged jar (application.properties and YAML variants).
15：Application properties packaged inside your jar (application.properties and YAML variants).
16：@PropertySource annotations on your @Configuration classes.
17：Default properties (specified using SpringApplication.setDefaultProperties).
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