正文

springboot梳理-springapplication

手握太阳  2022-02-14  133

关键词：

简单启动方式

public static void main(String[] args) {
    SpringApplication.run(MySpringConfiguration.class, args);
}

调试方式启动

java -jar myproject-0.0.1-SNAPSHOT.jar --debug

高级启动方式

@SpringBootApplication
public class App 
{
    public static void main( String[] args )
    {
        SpringApplication app=new SpringApplication(App.class);
        app.setBannerMode(Banner.Mode.OFF);
        app.run(args);
    }
}

Web Environment
1. A SpringApplication attempts to create the right type of ApplicationContext on your behalf. The algorithm used to determine a WebApplicationType is fairly simple:
  - If Spring MVC is present, an AnnotationConfigServletWebServerApplicationContext is used
  - If Spring MVC is not present and Spring WebFlux is present, an AnnotationConfigReactiveWebServerApplicationContext is used
  - Otherwise, AnnotationConfigApplicationContext is used
  This means that if you are using Spring MVC and the new WebClient from Spring WebFlux in the same application, Spring MVC will be used by default. You can override that easily by calling setWebApplicationType(WebApplicationType).
  
  It is also possible to take complete control of the ApplicationContext type that is used by calling setApplicationContextClass(…?).

Accessing Application Arguments

If you need to access the application arguments that were passed to SpringApplication.run(…?), you can inject a org.springframework.boot.ApplicationArguments bean. The ApplicationArguments interface provides access to both the raw String[] arguments as well as parsed option and non-option arguments, as shown in the following example:

import org.springframework.boot.*;
import org.springframework.beans.factory.annotation.*;
import org.springframework.stereotype.*;

@Component
public class MyBean {

    @Autowired
    public MyBean(ApplicationArguments args) {
        boolean debug = args.containsOption("debug");
        List<String> files = args.getNonOptionArgs();
        // if run with "--debug logfile.txt" debug=true, files=["logfile.txt"]
    }

}

Using the ApplicationRunner or CommandLineRunner
1. If you need to run some specific code once the SpringApplication has started, you can implement the ApplicationRunner or CommandLineRunner interfaces. Both interfaces work in the same way and offer a single run method, which is called just before SpringApplication.run(…?) completes.
  
  The CommandLineRunner interfaces provides access to application arguments as a simple string array, whereas the ApplicationRunner uses the ApplicationArguments interface discussed earlier. The following example shows a CommandLineRunner with a run method:
2. If several CommandLineRunner or ApplicationRunner beans are defined that must be called in a specific order, you can additionally implement the org.springframework.core.Ordered interface or use the org.springframework.core.annotation.Order annotation.
3. ```
import org.springframework.boot.*;
import org.springframework.stereotype.*;

@Component
public class MyBean implements CommandLineRunner {

    public void run(String... args) {
        // Do something...
    }

}
```

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正文

springboot梳理-springapplication

Web Environment

Accessing Application Arguments

Using the ApplicationRunner or CommandLineRunner

springboot源码解析-构建springapplication

springboot—启动原理之springapplication对象的创建(代码片段)

springapplication对象是如何构建的？springboot源码

springboot：springapplication.run的源码解析(代码片段)

springboot启动过程：springapplication及springapplicationbuilder

springboot项目中springapplication都做了什么

springboot启动流程

springboot源码分析之springapplication构造方法核心源码分析(代码片段)

springboot启动原理（基于2.x版本）-springapplication里有啥(代码片段)

springboot-运行部署

springboot启动过程：springapplication及springapplicationbuilder(代码片段)

springboot启动过程：springapplication及springapplicationbuilder(代码片段)

写一个springboot的入门案例,为啥springapplication.run会报错?

#springboot常用扩展点介绍容器启动源码分析

涨姿势：springboot2.x启动全过程源码分析

springboot启动方式

springboot核心技术梳理(持续更新)

springboot是如何动起来的