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服务器之家 - 编程语言 - Java教程 - Spring Cloud Gateway自定义异常处理Exception Handler的方法小结

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

2021-11-11 13:20飞云~风之谷 Java教程

这篇文章主要介绍了Spring Cloud Gateway自定义异常处理Exception Handler的方法,本文通过两种方法结合实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下

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:

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@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

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@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

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//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...

到此这篇关于Spring Cloud Gateway自定义异常处理Exception Handler的文章就介绍到这了,更多相关Spring Cloud Gateway自定义异常处理内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家!

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

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