springcloud15---zuul-fallback

Posted 2020-11-14 672530440

package com.itmuch.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@SpringBootApplication
@EnableZuulProxy
public 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。
@Component
public 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-zuul
server:
  port: 8040
eureka:
  client:
    service-url:
      defaultZone: http://user:password123@localhost:8761/eureka
  instance:
    prefer-ip-address: true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 60000
ribbon:
  ConnectTimeout: 3000
  ReadTimeout: 60000

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.itmuch.cloud</groupId>
        <artifactId>microservice-spring-cloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <artifactId>microservice-gateway-zuul-fallback</artifactId>
    <packaging>jar</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zuul</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
    </dependencies>

</project>