Spring cloud實戰 從零開始一個簡單搜尋網站(五)
Client端畢竟是重中之中,萬一出現異常掛了怎麼辦,這時候我們希望做成一個叢集
Ribbon 是一個客戶端負載均衡器 Feign本身集成了Rabbon 這裡只說 Ribbon
先將Client專案 複製一份,改下bootstrap.properties就行
spring.application.name=client server.port=8882 spring.cloud.config.label=master spring.cloud.config.profile=dev spring.cloud.config.uri=http://localhost:8782/
新建ribbon專案
application.properties
eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
server.port=8681
spring.application.name=ribbon
POM
<?xml version="1.0" encoding="UTF-8"?> <project xmlnsView Code="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>tsearch_web</groupId> <artifactId>springtest-ribbon</artifactId> <version>0.0.1</version> <packaging>jar</packaging> <name>springtest-ribbon</name> <description>Note Server catch</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.1.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> <spring-cloud.version>Greenwich.M3</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-ribbon</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>Finchley.RELEASE</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
@SpringBootApplication @EnableEurekaClient @EnableDiscoveryClient public class SpringtestRibbonApplication { public static void main(String[] args) { SpringApplication.run(SpringtestRibbonApplication.class, args); } }
Controller
@RestController
public class RibbonController {
@Autowired
RestTemplate restTemplate;
@RequestMapping(value = "/")
public String search() {
String str = restTemplate.getForObject("http://CLIENT", String.class);
return str;
}
@Bean
@LoadBalanced
RestTemplate restTemplate() {
return new RestTemplate();
}
}
訪問 http://localhost:8681/
不斷重新整理 會預設切來切去
Router and Filter: Zuul
主要是做API 對映 比如api/user 對映到A伺服器的user. api/shop對映到B伺服器的shop
在Ribbon專案 的pom中加入zuul
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-zuul</artifactId> </dependency>
Application加入
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
@EnableZuulProxy
public class SpringtestRibbonApplication {
public static void main(String[] args) {
SpringApplication.run(SpringtestRibbonApplication.class, args);
}
}
ZUUL 可以通過SERVICE_ID 或者URL 對映 這裡對映到了turbine-test的伺服器
eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
server.port=8681
spring.application.name=ribbon
zuul.routes.users.path=/turb/**
zuul.routes.users.serviceId=turbine-test
也可以直接換成URL
eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
server.port=8681
spring.application.name=ribbon
zuul.routes.users.path=/turb/**
zuul.routes.users.url=http://localhost:8783/