Spring Boot Rest-如何配置404-找不到资源

Question

我得到了一个工作Spring靴Rest服务。当路径错误时，它不会返回任何东西。一点反应都没有。同时它也不会抛出错误。理想情况下，我希望出现404 not found错误。

@ControllerAdvice
public class GlobalErrorHandler extends ResponseEntityExceptionHandler {

}

ResponseEntityExceptionHandler中有此方法

protected ResponseEntity<Object> handleNoHandlerFoundException(NoHandlerFoundException ex, HttpHeaders headers,
                                                     HttpStatus status, WebRequest request) {

    return handleExceptionInternal(ex, null, headers, status, request);
}

我已在属性中标记error.whiteLabel.enabled=false

要将404 not found响应抛回客户端，我还必须为此服务执行什么操作

 @EnableAutoConfiguration // Sprint Boot Auto Configuration
@ComponentScan(basePackages = "com.xxxx")
@EnableJpaRepositories("com.xxxxxxxx") // To segregate MongoDB
                                                        // and JPA repositories.
                                                        // Otherwise not needed.
@EnableSwagger // auto generation of API docs
@SpringBootApplication
@EnableAspectJAutoProxy
@EnableConfigurationProperties

public class Application extends SpringBootServletInitializer {

    private static Class<Application> appClass = Application.class;

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(appClass).properties(getProperties());

    }

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

    @Bean
    public FilterRegistrationBean correlationHeaderFilter() {
        FilterRegistrationBean filterRegBean = new FilterRegistrationBean();
        filterRegBean.setFilter(new CorrelationHeaderFilter());
        filterRegBean.setUrlPatterns(Arrays.asList("/*"));

        return filterRegBean;
    }

    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }

    static Properties getProperties() {
        Properties props = new Properties();
        props.put("spring.config.location", "classpath:/");
        return props;
    }

    @Bean
    public WebMvcConfigurerAdapter webMvcConfigurerAdapter() {
        WebMvcConfigurerAdapter webMvcConfigurerAdapter = new WebMvcConfigurerAdapter() {
            @Override
            public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
                configurer.favorPathExtension(false).favorParameter(true).parameterName("media-type")
                        .ignoreAcceptHeader(false).useJaf(false).defaultContentType(MediaType.APPLICATION_JSON)
                        .mediaType("xml", MediaType.APPLICATION_XML).mediaType("json", MediaType.APPLICATION_JSON);
            }
        };
        return webMvcConfigurerAdapter;
    }

    @Bean
    public RequestMappingHandlerMapping defaultAnnotationHandlerMapping() {
        RequestMappingHandlerMapping bean = new RequestMappingHandlerMapping();
        bean.setUseSuffixPatternMatch(false);
        return bean;
    }
}

Answer 1

解决方法很简单：

首先，您需要实现将处理所有错误情况的控制器。此控制器必须具有@controlleradvice--定义应用于所有@requestmappings的@exceptionhandler所需的。

@ControllerAdvice
public class ExceptionHandlerController {

    @ExceptionHandler(NoHandlerFoundException.class)
    @ResponseStatus(value= HttpStatus.NOT_FOUND)
    @ResponseBody
    public ErrorResponse requestHandlingNoHandlerFound() {
        return new ErrorResponse("custom_404", "message for 404 error code");
    }
}

在@exceptionhandler中提供要覆盖响应的异常。noHandlerFoundException是Spring无法委托请求（404种情况）时生成的异常。您还可以指定throwable来覆盖任何异常。

@SpringBootApplication
@EnableWebMvc
public class Application {

    public static void main(String[] args) {
        ApplicationContext ctx = SpringApplication.run(Application.class, args);

        DispatcherServlet dispatcherServlet = (DispatcherServlet)ctx.getBean("dispatcherServlet");
        dispatcherServlet.setThrowExceptionIfNoHandlerFound(true);
    }
}

使用未定义URL时的结果

{
    "errorCode": "custom_404",
    "errorMessage": "message for 404 error code"
}

更新：如果您使用application.properties配置SpringBoot应用程序，那么您需要添加以下属性，而不是在main方法中配置DispatcherServlet（感谢@mengchengfeng):

spring.mvc.throw-exception-if-no-handler-found=true
spring.resources.add-mappings=false