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); } }