1、閘道器是什麼東西？以及它的作用？

簡單點說：閘道器就是網路攔截器，而zuul就是在訪問到介面之前的攔截器；

它可以解決跨域問題，攔截訪問路徑，路由到不同的微服務地址；

比喻點說，就是像Nginx的反向代理相同

2、實現

pom.xml

<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>

	<groupId>com.cloud</groupId>
	<artifactId>service-zuul</artifactId>
	<version>1.0.0</version>
	<packaging>jar</packaging>

	<name>service-zuul</name>
	<url>http://maven.apache.org</url>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.2.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<!-- 閘道器zuul依賴包 -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-zuul</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.RC1</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

</project>
 

application.yml

#服務註冊中心(訪問中心)
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8888/eureka/
#本服務埠
server:
  port: 8769
#本服務名稱
spring:
  application:
    name: service-zuul
#本服務閘道器路由地址（核心配置部分）
zuul:
  routes:
    api-a:
      path: /member/**
      service-id: service-member
    api-b:
      path: /order/**
      service-id: consumer-order
 

其中zuul下面的path的配置可以自行定義

xxApp.java

package com.cloud.zuul;

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

/**
 * Hello world!
 *
 */
@SpringBootApplication
@EnableEurekaClient
@EnableZuulProxy//開啟閘道器功能，否則分發失敗
public class ZuulApp {
	public static void main(String[] args) {
		SpringApplication.run(ZuulApp.class, args);
	}
}
 

其中註解@EnableZuulProxy，開啟閘道器代理功能，如果不開啟，則無法分發地址，

訪問結果就是白板頁