Spring Cloud Gateway自定义异常处理Exception Handler的方法小结_Java教程

版本: Spring Cloud 2020.0.3

常见的方法有实现自己的 DefaultErrorWebExceptionHandler 或仅实现ErrorAttributes.

方法1: ErrorWebExceptionHandler (仅供示意)

自定义一个 GlobalErrorAttributes:

				?

									@Component

									public class GlobalErrorAttributes extends DefaultErrorAttributes{

									    @Override

									    public Map<String, Object> getErrorAttributes(ServerRequest request, ErrorAttributeOptions options) {

									        Throwable error = super.getError(request);

									        Map<String, Object> map = super.getErrorAttributes(request, options);

									        map.put("status", HttpStatus.BAD_REQUEST.value());

									        map.put("message", error.getMessage());

									        return map;

									    }

									}

实现一个

				?

									@Component

									@Order(-2)

									public class GlobalErrorWebExceptionHandler extends AbstractErrorWebExceptionHandler {

									    public GlobalErrorWebExceptionHandler(GlobalErrorAttributes gea, ApplicationContext applicationContext,

									                                          ServerCodecConfigurer serverCodecConfigurer) {

									        super(gea, new WebProperties.Resources(), applicationContext);

									        super.setMessageWriters(serverCodecConfigurer.getWriters());

									        super.setMessageReaders(serverCodecConfigurer.getReaders());

									    }

									    //渲染html或json

									    @Override

									    protected RouterFunction<ServerResponse> getRoutingFunction(final ErrorAttributes errorAttributes) {

									        return RouterFunctions.route(RequestPredicates.all(), this::renderErrorResponse);

									    }

									    private Mono<ServerResponse> renderErrorResponse(final ServerRequest request) {

									        final Map<String, Object> errorPropertiesMap = getErrorAttributes(request, ErrorAttributeOptions.defaults());

									        return ServerResponse.status(HttpStatus.BAD_REQUEST)

									                .contentType(MediaType.APPLICATION_JSON)

									                .body(BodyInserters.fromValue(errorPropertiesMap));

									    }

									}

方法2, 仅实现一个 ErrorAttributes, 以覆盖默认的 DefaultErrorAttributes

				?

									//Spring 默认的就很好了.

									@Component

									public class GatewayErrorAttributes extends DefaultErrorAttributes {

									    private static final Logger logger = LoggerFactory.getLogger(GatewayErrorAttributes.class);

									    @Override

									    public Map<String, Object> getErrorAttributes(ServerRequest request,  ErrorAttributeOptions options) {

									        Throwable error = super.getError(request);

									        Map<String, Object> errorAttributes = new HashMap<>(8);

									        errorAttributes.put("message", error.getMessage());

									        errorAttributes.put("method", request.methodName());

									        errorAttributes.put("path", request.path());

									        MergedAnnotation<ResponseStatus> responseStatusAnnotation = MergedAnnotations

									                .from(error.getClass(), MergedAnnotations.SearchStrategy.TYPE_HIERARCHY).get(ResponseStatus.class);

									        HttpStatus errorStatus = determineHttpStatus(error, responseStatusAnnotation);

									        //必须设置, 否则会报错, 因为 DefaultErrorWebExceptionHandler 的 renderErrorResponse 方法会获取此属性, 重新实现 DefaultErrorWebExceptionHandler也可.

									        errorAttributes.put("status", errorStatus.value());

									        errorAttributes.put("code", errorStatus.value());

									        //html view用

									        errorAttributes.put("timestamp", new Date());

									        //html view 用

									        errorAttributes.put("requestId", request.exchange().getRequest().getId());

									        errorAttributes.put("error", errorStatus.getReasonPhrase());

									        errorAttributes.put("exception", error.getClass().getName());

									        return errorAttributes;

									    }

									    //从DefaultErrorWebExceptionHandler中复制过来的

									    private HttpStatus determineHttpStatus(Throwable error, MergedAnnotation<ResponseStatus> responseStatusAnnotation) {

									        if (error instanceof ResponseStatusException) {

									            return ((ResponseStatusException) error).getStatus();

									        }

									        return responseStatusAnnotation.getValue("code", HttpStatus.class).orElse(HttpStatus.INTERNAL_SERVER_ERROR);

									    }

									}

这样就可以了.

注意注意: 必须设置 errorAttributes.put("status", errorStatus.value()) , 否则会报错, 因为 DefaultErrorWebExceptionHandler 的 renderErrorResponse 方法会获取此属性. 除非你自己像方法一一样重新实现 DefaultErrorWebExceptionHandler.

然后在网关中访问一个不存在的服务, 即可看到效果.

curl 'http://127.0.0.1:8900/fundmain22/abc/gogogo?id=1000' --header 'Accept: application/json'
{"exception":"org.springframework.web.server.ResponseStatusException","path":"/fundmain22/abc/gogogo","code":404,"method":"GET","requestId":"094e53e5-1","message":"404 NOT_FOUND","error":"Not Found","status":404,"timestamp":"2021-08-09T11:07:44.106+0000"}

感谢网络上的各种文章...

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原文链接：https://www.cnblogs.com/cnscud/p/15120406.html