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Spring Boot Document Part.4 23.S

Spring Boot Document Part.4 23.S

作者: TinChiWay | 来源:发表于2017-12-14 22:49 被阅读0次

    23.SpringApplication

    SpringApplication类使用main()方法来方便的方式来引导Spring application的启动.在许多情况下,你可以委托给静态SpringApplication.run方法:

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

    一般的启动失败大都是因为端口(8080)被占用

    启动打印的横幅可以自定义

    Variable Description
    ${application.version} The version number of your application as declared in MANIFEST.MF. For example Implementation-Version: 1.0 is printed as 1.0.
    ${application.formatted-version} The version number of your application as declared in MANIFEST.MF formatted for display (surrounded with brackets and prefixed with v). For example (v1.0).
    ${spring-boot.version} The Spring Boot version that you are using. For example 1.5.9.RELEASE.
    ${spring-boot.formatted-version} The Spring Boot version that you are using formatted for display (surrounded with brackets and prefixed with v). For example (v1.5.9.RELEASE).
    ${Ansi.NAME} (or ${AnsiColor.NAME}, ${AnsiBackground.NAME}, ${AnsiStyle.NAME}) Where NAME is the name of an ANSI escape code. See AnsiPropertySource for details.
    ${application.title} The title of your application as declared in MANIFEST.MF. For exampleImplementation-Title: MyApp is printed as MyApp.

    yaml 可以禁用横幅

    spring:
        main:
            banner-mode: "off"
    

    Accessing application arguments

    访问应用程序参数

    可以注入一个org.springframework.boot.ApplicationArgumentsbean,来访问程序参数.

    import org.springframework.boot.*
    import org.springframework.beans.factory.annotation.*
    import org.springframework.stereotype.*
    
    @Component
    public class MyBean {
    
        @Autowired //注入args[]
        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"]
        }
    
    }
    

    使用ApplicationRunner或CommandLineRunner

    你可以通过实现ApplicationRunnerCommandLineRunner 这两个接口来在启动时运行一些特殊的代码once,这两个接口都以相同的方式工作,并提供一个run方法,将在SpringApplication.run() 完成之前调用.

    CommandLineRunner 接口使用一个简单的String[] 提供对应用程序参数的访问,而ApplicationRunner 则使用ApplicationArguments 接口

    import org.springframework.boot.*
    import org.springframework.stereotype.*
    
    @Component
    public class MyBean implements CommandLineRunner {
    
        public void run(String... args) {
            // Do something...
        }
    
    }
    

    程序退出

    如果bean 在SpringApplication.exit() 调用时希望返回一个特定的退出代码,它们可以实现org.springframework.boot.ExitCodeGenerator 接口.这个退出代码然后可以被传递给System.exit()作为状态代码返回它.

    @SpringBootApplication
    public class ExitCodeApplication {
    
        @Bean
        public ExitCodeGenerator exitCodeGenerator() {
            return new ExitCodeGenerator() {
                @Override
                public int getExitCode() {
                    return 42;
                }
            };
        }
    
        public static void main(String[] args) {
            System.exit(SpringApplication           .exit(SpringApplication.run(ExitCodeApplication.class, args)));
        }
    
    }
    

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