转载

Spring Boot命令行运行器

CommandLineRunner是一个带有run方法的简单spring引导接口。Spring Boot启动后将自动调用实现CommandLineRunner接口的所有bean的run方法。

Command Line Runner在加载应用程序上下文之后以及Spring Application run方法完成之前执行,相当于你的应用的初始化过程,一般用来实现一些数据预先加载或预先处理。

@SpringBootApplication
<b>public</b> <b>class</b> DemoApplication implements CommandLineRunner {

    <b>private</b> <b>final</b> Logger logger = LoggerFactory.getLogger(DemoApplication.<b>class</b>);

    <b>public</b> <b>static</b> <b>void</b> main(String args) {
        SpringApplication.run(DemoApplication.<b>class</b>, args);
    }

    @Override
    <b>public</b> <b>void</b> run(String... strings) throws Exception {
     ....
    }

}

上面的run方法参数是命令行参数,使用java -jar 启动这个应用的命令行参数。

如果有多个命令行运行器,可以进行排序:

@Component
@Order(1)
<b>public</b> <b>class</b> AnotherDatabaseLoader implements CommandLineRunner {

@Component
@Order(2)
<b>public</b> <b>class</b> DataLoader implements CommandLineRunner {

另外一种在主应用的写法:

@SpringBootApplication
<b>public</b> <b>class</b> UnsplashApplication {
 
    <b>public</b> <b>static</b> <b>void</b> main(String args) {
        SpringApplication.run(UnsplashApplication.<b>class</b>, args);
    }
 
    @Bean
    CommandLineRunner runner(){
        <b>return</b> args -> {
            System.out.println(<font>"CommandLineRunner running in the UnsplashApplication class..."</font><font>);
        };
    }
 
}
</font>
原文  https://www.jdon.com/50511
正文到此结束
Loading...