Update 22. SpringApplication.md

IV. Spring Boot features/22. SpringApplication.md

@@ -0,0 +1,23 @@
+### SpringApplication
+SpringApplication类提供了一种从main()方法启动Spring应用的便捷方式。在很多情况下，你只需委托给SpringApplication.run这个静态方法：
+```java
+public static void main(String[] args){
+    SpringApplication.run(MySpringConfiguration.class, args);
+}
+```
+当应用启动时，你应该会看到类似下面的东西（这是何方神兽？？）：
+```java
+.   ____          _            __ _ _
+ /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
+( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
+ \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
+  '  |____| .__|_| |_|_| |_\__, | / / / /
+ =========|_|==============|___/=/_/_/_/
+ :: Spring Boot ::   v1.2.2.BUILD-SNAPSHOT
+
+2013-07-31 00:08:16.117  INFO 56603 --- [           main] o.s.b.s.app.SampleApplication            : Starting SampleApplication v0.1.0 on mycomputer with PID 56603 (/apps/myapp.jar started by pwebb)
+2013-07-31 00:08:16.166  INFO 56603 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6e5a8246: startup date [Wed Jul 31 00:08:16 PDT 2013]; root of context hierarchy
+2014-03-04 13:09:54.912  INFO 41370 --- [           main] .t.TomcatEmbeddedServletContainerFactory : Server initialized with port: 8080
+2014-03-04 13:09:56.501  INFO 41370 --- [           main] o.s.b.s.app.SampleApplication            : Started SampleApplication in 2.992 seconds (JVM running for 3.658)
+```
+默认情况下会显示INFO级别的日志信息，包括一些相关的启动详情，比如启动应用的用户等。