SpringBoot初始化加载获取所有url ApplicationRunner CommandLineRunner

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在这里插入图片描述
SpringBoot方便了对Spring项目的开发整合，有时候我们在项目启动时会需要初始化一些东西，比如读取配置，记录开始时间一些需求，Spring Boot 提供了两个接口 ApplicationRunner ,CommandLineRunner。通过实现接口中的run方法可以进行项目启动的初始化

ApplicationRunner

@FunctionalInterface
public interface ApplicationRunner {

  /**
   * Callback used to run the bean.
   * @param args incoming application arguments
   * @throws Exception on error
   */
  void run(ApplicationArguments args) throws Exception;

}

CommandLineRunner

@FunctionalInterface
public interface CommandLineRunner {

	/**
	 * Callback used to run the bean.
	 * @param args incoming main method arguments
	 * @throws Exception on error
	 */
	void run(String... args) throws Exception;

}

两者都是函数式接口只存在一个方法。唯一的区别时参数类型不同，前者时数组，后者时字符串

下面是实现Code 项目会在启动时，读取所有url添加到 allUrl 对象中

初始化加载url集合

@Component
public class InitUrlConfig implements ApplicationRunner {


    @Resource
    WebApplicationContext applicationContext;


    public static List<String> allUrl;

    @Override
    public void run(ApplicationArguments args) throws Exception {
        RequestMappingHandlerMapping mapping = applicationContext.getBean(RequestMappingHandlerMapping.class);
        // 获取url与类和方法的对应信息
        Map<RequestMappingInfo, HandlerMethod> map = mapping.getHandlerMethods();

        List<String> urlList = new ArrayList<>();
        for (RequestMappingInfo info : map.keySet()) {
            // 获取url的Set集合，一个方法可能对应多个url
            Set<String> patterns = info.getPatternsCondition().getPatterns();
            urlList.addAll(patterns);
        }
        allUrl = urlList;

    }
}

接口简单使用


@Component
@Order(1)
public class InitConfig implements ApplicationRunner {
    @Override
    public void run(ApplicationArguments applicationArguments) throws Exception {
        System.out.println("ApplicationRunner");
    }

    @Bean
    public String Init(){
        System.out.println("方法的初始化");
        return "初始化";
    }
}

@Component
@Order(2) 
public class InitOrderConfig implements ApplicationRunner {
    @Override
    public void run(ApplicationArguments applicationArguments) throws Exception {
        System.out.println("Application2");
    }
}