SpringCloud Zuul Eureka

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用maven的弊端就是各个依赖包版本要求比较高，有一个依赖包的版本不兼容就会导致各种启动加载的问题。

Demo中Zuul，Eureka都是被Spring封过的，有利于初学者快速搭建环境。

对于Spring高版本目前尝试的结果是会到导致 spring-cloud-starter-eureka 有兼容问题。

1.3.5版本是测试过。可以进行serviceId转发功能。如果Zuul只是做为URL转发，可以不用导入Eureka的依赖包。

下面是maven项目使用的pom.xml

aspectjweaver 1.8.6 版本是为了解决1.3.5版本启动Zuul时JoinPoint 找不到的问题。

NoClassDefFoundError: org/aspectj/lang/JoinPoint

Zuul 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>zuul-demo</groupId>
  <artifactId>zuul-demo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <parent>
	   <groupId>org.springframework.boot</groupId>
	   <artifactId>spring-boot-starter-parent</artifactId>
	   <version>1.3.5.RELEASE</version>
  </parent>
 	<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>
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.8.6</version>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Brixton.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
</project>

Eureka client pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>springcloud-demo</groupId>
	<artifactId>springcloud-demo</artifactId>
	<packaging>jar</packaging>
	<version>0.0.1-SNAPSHOT</version>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<mainClass>demo.EurekaSampleServer</mainClass>
				</configuration>
				<executions>
					<execution>
						<goals>
							<goal>repackage</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
	<parent>
	    <groupId>org.springframework.boot</groupId>
	    <artifactId>spring-boot-starter-parent</artifactId>
	    <version>1.3.5.RELEASE</version>
	    <relativePath/> <!-- lookup parent from repository -->
	</parent>
	<dependencies>
	    <dependency>
	        <groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-test</artifactId>
		<scope>test</scope>
	    </dependency>
	    <dependency>
	        <groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-eureka-server</artifactId>
	    </dependency>
	</dependencies>
	<dependencyManagement>
	    <dependencies>
	        <dependency>
		    <groupId>org.springframework.cloud</groupId>
		    <artifactId>spring-cloud-dependencies</artifactId>
		    <version>Brixton.RELEASE</version>
		    <type>pom</type>
		    <scope>import</scope>
		</dependency>
	    </dependencies>
	</dependencyManagement>
</project>

Eureka server pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>springcloud-demo</groupId>
	<artifactId>springcloud-demo</artifactId>
	<packaging>jar</packaging>
	<version>0.0.1-SNAPSHOT</version>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<mainClass>demo.EurekaSampleController</mainClass>
				</configuration>
				<executions>
					<execution>
						<goals>
							<goal>repackage</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.3.5.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Brixton.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
</project>

在图中可以看出，Zuul也需要被当成一个service注册到Eureka中，否则会出现Forwarding Error错误，因为在Zuul的配置中，无法找到serviceId对应的URL信息。

当Zuul启动好之后，可以看到如下的log：

2017-11-10 15:57:13.560  INFO 4952 --- [nio-1111-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 52 ms
2017-11-10 15:57:45.773  INFO 4952 --- [nio-1111-exec-6] c.n.e.registry.AbstractInstanceRegistry  : Registered instance COMPUTE-SERVICE/HOSTNAME:compute-service:2222 with status UP (replication=false)
2017-11-10 15:57:46.554  INFO 4952 --- [nio-1111-exec-7] c.n.e.registry.AbstractInstanceRegistry  : Registered instance COMPUTE-SERVICE/HOSTNAME:compute-service:2222 with status UP (replication=true)
2017-11-10 15:59:00.547  INFO 4952 --- [nio-1111-exec-3] c.n.e.registry.AbstractInstanceRegistry  : Registered instance API-GATEWAY/HOSTNAME:api-gateway:8000 with status UP (replication=false)
2017-11-10 15:59:01.065  INFO 4952 --- [nio-1111-exec-2] c.n.e.registry.AbstractInstanceRegistry  : Registered instance API-GATEWAY/HOSTNAME:api-gateway:8000 with status UP (replication=true)

说明当前的Zuul已经被注册到Eureka中，所以在Zuul的配置中可以通过serviceId找到对应在Eureka中的service，从而转发到微服务中。

Zuul在Spring中的配置信息，application.properties：

zuul.routes.compute-service.path=/compute-service/**
zuul.routes.compute-service.serviceId=compute-service
#zuul.routes.compute-service.url=http://192.168.10.100:2222

spring.application.name=api-gateway
server.port=8000

#eureka.client.serviceUrl.defaultZone=${EUREKA_URL:http://user:password@localhost:5000}/eureka/
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/

Eureka client在Spring中的配置信息，application.properties：

spring.application.name=compute-service
server.port=2222

eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/

Eureka server在Spring中的配置信息，application.properties：

server.port=1111

eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

eureka.client.serviceUrl.defaultZone=http://localhost:${server.port}/eureka/

该配置中disable了Eureka把自身作为client注册到Eureka server中。

最后，先启动Eureka server, 启动client 最后Zuul。当都启动完成时，在Eureka server的画面可以看到注册的service信息http://localhost:1111/

访问Zuul的URL，http://localhost:8000/compute-service/ 内部转发到compute-service上。

Eureka Client代码：

package demo;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@Configuration
@RestController
@EnableEurekaClient
@SpringBootApplication
public class EurekaSampleController {

	  @RequestMapping("/")
	  public String home() {
	    return "Hello World";
	  }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(EurekaSampleController.class, args);
    }
}

Eureka Server：

package demo;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaSampleServer {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(EurekaSampleServer.class, args);
    }
}

Zuul：

package demo;

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

@EnableZuulProxy
//@SpringCloudApplication
@SpringBootApplication
public class ZuulDemoApplication {

    @Bean
    public SimpleFilter simpleFilter() {
        return new SimpleFilter();
    }
    
	public static void main(String[] args) {
		SpringApplication.run(ZuulDemoApplication.class, args);
	}
}