一、概述

　　参看地址：

　　Zuul本事是基于Hystrix和Ribbon等，默认会支持Hystrix的Command等

　　在Zuul给定的路由回路跳闸，可以通过创建一个类型为ZuulFallbackProvider的bean来提供回退响应。在此bean中，您需要指定回退的路由ID，并提供ClientHttpResponse作为回退。这是一个非常简单的ZuulFallbackProvider实现。

 二、提供Hystrix路由回退

　　当Zuul中给定路由的电路被触发时，您可以通过创建一个类型为ZuulFallbackProvider的bean来提供回退响应。在此bean中，您需要指定回退的路由ID，并提供ClientHttpResponse作为回退。这是一个非常简单的ZuulFallbackProvider实现。

class MyFallbackProvider implements ZuulFallbackProvider {    @Override    public String getRoute() {        return "customers";    }    @Override    public ClientHttpResponse fallbackResponse() {        return new ClientHttpResponse() {            @Override            public HttpStatus getStatusCode() throws IOException {                return HttpStatus.OK;            }            @Override            public int getRawStatusCode() throws IOException {                return 200;            }            @Override            public String getStatusText() throws IOException {                return "OK";            }            @Override            public void close() {            }            @Override            public InputStream getBody() throws IOException {                return new ByteArrayInputStream("fallback".getBytes());            }            @Override            public HttpHeaders getHeaders() {                HttpHeaders headers = new HttpHeaders();                headers.setContentType(MediaType.APPLICATION_JSON);                return headers;            }        };    }}

路由配置

zuul:  routes:    customers: /customers/**

如果您希望为所有路由提供默认回退，则可以创建类型为ZuulFallbackProvider的bean，并让getRoute方法返回*或null

class MyFallbackProvider implements ZuulFallbackProvider {    @Override    public String getRoute() {        return "*";    }    @Override    public ClientHttpResponse fallbackResponse() {        return new ClientHttpResponse() {            @Override            public HttpStatus getStatusCode() throws IOException {                return HttpStatus.OK;            }            @Override            public int getRawStatusCode() throws IOException {                return 200;            }            @Override            public String getStatusText() throws IOException {                return "OK";            }            @Override            public void close() {            }            @Override            public InputStream getBody() throws IOException {                return new ByteArrayInputStream("fallback".getBytes());            }            @Override            public HttpHeaders getHeaders() {                HttpHeaders headers = new HttpHeaders();                headers.setContentType(MediaType.APPLICATION_JSON);                return headers;            }        };    }}

如果您想选择基于故障原因的响应，请使用FallbackProvider，它将替换未来版本中的ZuulFallbackProvder。

class MyFallbackProvider implements FallbackProvider {    @Override    public String getRoute() {        return "*";    }    @Override    public ClientHttpResponse fallbackResponse(final Throwable cause) {        if (cause instanceof HystrixTimeoutException) {            return response(HttpStatus.GATEWAY_TIMEOUT);        } else {            return fallbackResponse();        }    }    @Override    public ClientHttpResponse fallbackResponse() {        return response(HttpStatus.INTERNAL_SERVER_ERROR);    }    private ClientHttpResponse response(final HttpStatus status) {        return new ClientHttpResponse() {            @Override            public HttpStatus getStatusCode() throws IOException {                return status;            }            @Override            public int getRawStatusCode() throws IOException {                return status.value();            }            @Override            public String getStatusText() throws IOException {                return status.getReasonPhrase();            }            @Override            public void close() {            }            @Override            public InputStream getBody() throws IOException {                return new ByteArrayInputStream("fallback".getBytes());            }            @Override            public HttpHeaders getHeaders() {                HttpHeaders headers = new HttpHeaders();                headers.setContentType(MediaType.APPLICATION_JSON);                return headers;            }        };    }}

 

 

 

 

 

 

 

 

 

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