当Zuul中给定路由的电路跳闸时，您可以通过创建类型为ZuulFallbackProvider的bean来提供回退响应。在这个bean中，您需要指定回退的路由ID，并提供返回的ClientHttpResponse作为后备。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;
}
};
}
}
这里是路由配置的样子。
zuul:
routes:
customers: /customers/**
如果您希望为所有路由提供默认的回退，您可以创建一个类型为ZuulFallbackProvider的bean，并且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;
}
};
}
}