微服务和VUE入门教程(16)： zuul 熔断

package com.zuul.filter;

import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ApiFallbackProvider implements FallbackProvider {

    @Override
    public String getRoute() {
    // 所有请求，皆通过这里
        return "*";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
            //返回的内容，暂时不知道如何使用
                String response = "{\n" +
                        "    \"msg\": \"core服务失去联系,请联系管理员\",\n" +
                        "    \"code\": 400,\n" +
                        "    \"data\": null\n" +
                        "}";
                ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(response.getBytes());
                return byteArrayInputStream;
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders httpHeaders = new HttpHeaders();
                httpHeaders.setContentType(MediaType.APPLICATION_JSON);
                return httpHeaders;
            }
        };
    }
}

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