package com.itmuch.cloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.zuul.EnableZuulProxy;@SpringBootApplication@EnableZuulProxypublic class ZuulApplication {  public static void main(String[] args) {    SpringApplication.run(ZuulApplication.class, args);  }}

package com.itmuch.cloud.fallback;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStream;import org.springframework.cloud.netflix.zuul.filters.route.ZuulFallbackProvider;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;//通过zuul（8040端口）访问user微服务http://localhost:8040/microservice-provider-user/simple/1//如果此时user微服务停掉，就会返回"fallbackmicroservice-provider-user",(使用的是hysitrcs的断路器功能)//feign的Fallback是针对一个类，zuul的Fallback是针对一个微服务。@Componentpublic class MyFallbackProvider implements ZuulFallbackProvider {  @Override  public String getRoute() {    return "microservice-provider-user";  }  @Override  public ClientHttpResponse fallbackResponse() {    return new ClientHttpResponse() {      @Override      public HttpStatus getStatusCode() throws IOException {        return HttpStatus.BAD_REQUEST;      }      @Override      public int getRawStatusCode() throws IOException {        return HttpStatus.BAD_REQUEST.value();      }      @Override      public String getStatusText() throws IOException {        return HttpStatus.BAD_REQUEST.getReasonPhrase();      }      @Override      public void close() {      }      @Override      public InputStream getBody() throws IOException {        return new ByteArrayInputStream(("fallback" + MyFallbackProvider.this.getRoute()).getBytes());      }      @Override      public HttpHeaders getHeaders() {        HttpHeaders headers = new HttpHeaders();        headers.setContentType(MediaType.APPLICATION_JSON);        return headers;      }    };  }}

spring:  application:    name: microservice-gateway-zuulserver:  port: 8040eureka:  client:    service-url:      defaultZone: http://user:password123@localhost:8761/eureka  instance:    prefer-ip-address: truehystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 60000ribbon:  ConnectTimeout: 3000  ReadTimeout: 60000

         
      
       4.0.0
          
              
       
        com.itmuch.cloud
               
       
        microservice-spring-cloud
               
       
        0.0.1-SNAPSHOT
           
          
      
       microservice-gateway-zuul-fallback
          
      
       jar
          
              
       
        UTF-8
           
          
              
                   
        
         org.springframework.cloud
                    
        
         spring-cloud-starter-zuul
                
               
                   
        
         org.springframework.cloud
                    
        
         spring-cloud-starter-eureka