Router and Filter: Zuul。 Zuul is a JVM based router and server side load balancer by Netflix。

  Zuul是一個路由器，而且是一個Server端的負載均衡器，Zuul預設的會反向代理到所有註冊到Eureka上的服務。

Zuul實現代理。

啟動類

package com.dynamic.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);    	
    }
}
 

後面的程式碼中，啟動類不會變化。

  @EnableZuulProxy，是一個組合註解，@EnableCircuitBreaker，@EnableDiscoveryClient。因為它有@EnableDiscoveryClient，所以可以註冊到Eureka上。

POM.xml中加入依賴

<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>

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

	<parent>
			<groupId>com.dynamic.cloud</groupId>
			<artifactId>microservice-spring-cloud</artifactId>
			<version>0.0.1-SNAPSHOT</version>
	</parent>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>


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

</dependencies>


</project>
 

spring:
  application:
    name: microservice-gateway-zuul
server:
  port: 8040 
eureka:
  client: 
    service-url: 
      defaultZone: http://user:[email protected]:8761/eureka #把Eureka註冊到那個Eureka
  instance: 
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000
zuul:
  ignored-services: microservice-comsumer-movie-ribbon-withhystrix
  routes:
    microservice-provider-user: /user/**
    
 

zuul:
  ignored-services: microservice-comsumer-movie-ribbon-withhystrix  ，不允許代理本服務
  routes:
    microservice-provider-user: /user/**   ，可以使用user替換microservice-provider-user訪問路徑。

只想反向代理一個微服務，不想反向代理其他的微服務
第一種：所有的服務都ignored，只有配置的才反向代理
第二種：在ignored上配置，不代理的服務。

啟動Eureka，使用者服務，Zuul服務

已經完成了簡單的Zuul的例項

1.指定path+serviceid

zuul: 
  routes: 
    abc: #讓zuul方向代理微服務，路徑是/user-path  abc只要是唯一的就行，可隨意寫
      path: /user-path/**  #封層匹配
      serviceId: microservice-provider-user
    

2.指定Path+url

zuul: 
  routes: 
    abc: #讓zuul方向代理微服務，路徑是/user-path  abc只要是唯一的就行，可隨意寫
      path: /user-path/**  #封層匹配
      #serviceId: microservice-provider-user
      url: http://localhost:7900/

3.解決path + url 實現負載均衡

zuul: 
  routes: 
    abc: #讓zuul方向代理微服務，路徑是/user-path  abc只要是唯一的就行，可隨意寫
      path: /user-path/**  #封層匹配
      serviceId: microservice-provider-user
ribbon:
  eureka:
    enabled: false
microservice-provider-user: #這是Ribbon要請求的微服務的ServiceId
  ribbon:
    listOfServers: http://localhost:7900,http://localhost:7901