Tips: 以下内容根据源码中的注解翻译
SpringApplication
SpringApplication可用来从一个Java main方法引导和启动一个Spring应用。默认情况下,SpringApplication按照以下步骤引导你的应用:
- 创建一个合适的ApplicationContext(依赖于你的classpath)
- 注册一个CommandLinePropertySource,用来将命令行参数暴露为Spring属性
- 刷新应用上下文,加载所有单例beans
- 触发所有的CommandLineRunner beans
在绝大多数情况下,可以直接在main方法中调用静态方法 SpringApplication.run(Class, String[])来引导你的应用:
@Configuration@EnableAutoConfigurationpublic class MyApplication {// ... Bean definitionspublic static void main(String[] args) {SpringApplication.run(MyApplication.class, args);}}
想要使用更多高级配置,可以创建一个SpringApplication实例并自定义,然后调用实例的run方法:
public static void main(String[] args) {SpringApplication application = new SpringApplication(MyApplication.class);// ... customize application settings hereapplication.run(args)}
SpringApplications可以从各种不同的资源读入beans。通常建议用一个单独的@Configuration类来引导你的应用,尽管如此,你也可以从以下资源读入beans:
- 完全限定的类名,将被AnnotatedBeanDefinitionReader加载
- XML配置文件的路径,将被XmlBeanDefintionReader加载,或者是groovy脚本,将被GroovyBeanDefintionReader加载
- 包名,将被ClassPathBeanDefinitioinReader扫描
Configuration属性会被绑定到SpringApplication。这让动态设置SpringApplication属性成为可能,如附加的资源("spring.main.sources" - 一个CSV列表) ,表示一个web环境的标识("spring.main.web-application-type=none" ),或 关闭banner的标记("spring.main.banner-mode=off")
源码中的注解:
Class that can be used to bootstrap and launch a Spring application from a Java main method. By default class will perform the following steps to bootstrap your application:
Create an appropriate ApplicationContext instance (depending on your classpath)
Register a CommandLinePropertySource to expose command line arguments as Spring properties
Refresh the application context, loading all singleton beans
Trigger any CommandLineRunner beans
In most circumstances the static run(Class, String[]) method can be called directly from your main method to bootstrap your application:@Configuration@EnableAutoConfigurationpublic class MyApplication {// ... Bean definitionspublic static void main(String[] args) {SpringApplication.run(MyApplication.class, args);}}For more advanced configuration a SpringApplication instance can be created and customized before being run:public static void main(String[] args) {SpringApplication application = new SpringApplication(MyApplication.class);// ... customize application settings hereapplication.run(args)}SpringApplications can read beans from a variety of different sources. It is generally recommended that a single @Configuration class is used to bootstrap your application, however, you may also set sources from:
The fully qualified class name to be loaded by AnnotatedBeanDefinitionReader
The location of an XML resource to be loaded by XmlBeanDefinitionReader, or a groovy script to be loaded by GroovyBeanDefinitionReader
The name of a package to be scanned by ClassPathBeanDefinitionScanner
Configuration properties are also bound to the SpringApplication. This makes it possible to set SpringApplication properties dynamically, like additional sources ("spring.main.sources" - a CSV list) the flag to indicate a web environment ("spring.main.web-application-type=none") or the flag to switch off the banner ("spring.main.banner-mode=off").
Since:
1.0.0
See Also:
run(Class, String[]), run(Class[], String[]), SpringApplication(Class...)