Spring Boot 2 健康执行器默认映射

Spring Boot 2 提供了一个健康执行器，默认情况下，它会将健康检查的端点映射到 `/actuator/health` 路径下。这个健康执行器可以帮助我们监控应用程序的运行状态，检查各个组件的健康情况，以及提供对健康检查端点的自定义配置。本文将介绍如何使用 Spring Boot 2 的健康执行器，并提供案例代码进行演示。

xml
    org.springframework.boot
    spring-boot-starter-actuator

properties
management.endpoints.web.base-path=/actuator
management.endpoints.web.path-mapping.health=health-check

java
@Configuration
public class ActuatorConfig {
    @Bean
    public HealthEndpoint healthEndpoint() {
        return new HealthEndpoint();
    }
    @Bean
    public WebEndpointRegistrar webEndpointRegistrar() {
        return new WebEndpointRegistrar();
    }
    @Bean
    public WebMvcEndpointHandlerMapping webMvcEndpointHandlerMapping(
            WebEndpointDiscoverer webEndpointDiscoverer,
            EndpointMediaTypes endpointMediaTypes,
            CorsConfigurationProperties corsProperties) {
        return new WebMvcEndpointHandlerMapping(webEndpointDiscoverer, endpointMediaTypes,
                corsProperties, new EndpointPathResolver(), new MvcEndpointPathProvider(),
                Collections.emptyList());
    }
}

java
@RestController
public class HealthCheckController {
    @Autowired
    private HealthEndpoint healthEndpoint;
    @GetMapping("/health-check")
    public ResponseEntity healthCheck() {
        Health health = healthEndpoint.health();
        HttpStatus status = determineHttpStatus(health.getStatus());
        return new ResponseEntity<>(health, status);
    }
    private HttpStatus determineHttpStatus(Status status) {
        if (status.equals(Status.UP)) {
            return HttpStatus.OK;
        } else if (status.equals(Status.DOWN)) {
            return HttpStatus.SERVICE_UNAVAILABLE;
        } else {
            return HttpStatus.INTERNAL_SERVER_ERROR;
        }
    }
}