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SpringCloud Eureak整合Ribbon经验总结和问题处理

蒸熟的土豆 2022-04-13 阅读 96
springcloudeurekaribbon

SpringCloud Eureak整合Ribbon经验总结

使用Eureka注册中心整合Ribbon

文章目录

前言

使用Eureak注册中心整合Ribbon,使用一个Eureka注册中心,2个Eureka客户端(包括一个服务提供方,一个服务消费客户端)

一、搭建服务注册中心和客户端

使用idea搭建一个多module模块,代码结构如下:
在这里插入图片描述

server -注册中心
provider-服务提供方
client-客户端
commom-公用类

二、代码说明

1.引入库

父类pom设置

<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.zz</groupId>
    <artifactId>hystrix</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>common</module>
        <module>provider</module>
        <module>client</module>
        <module>server</module>
    </modules>
    <packaging>pom</packaging>


    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.6</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>2021.0.1</spring-cloud.version>
    </properties>

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


    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</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>



</project>

注册中心pom如下

<?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/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>hystrix</artifactId>
        <groupId>com.zz</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>server</artifactId>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
       <!-- <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>
</project>

配置注册中心application.properites

#服务名称
spring.application.name=server
server.port=8080

management.endpoints.web.exposure.include=*
#作为Eureka注册中心不注册自己
eureka.client.fetch-registry=false
eureka.client.register-with-eureka=false

启动类增加注册@EnableEurekaServer

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }
}

注册中心到此结束

配置服务提供方pom

<?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/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>hystrix</artifactId>
        <groupId>com.zz</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <description>服务提供方</description>
    <artifactId>provider</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>com.zz</groupId>
            <artifactId>common</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>

    </dependencies>


</project>

服务方启动类 增加注解@EnableDiscoveryClient代表向注册中心注册

@SpringBootApplication
@EnableDiscoveryClient
public class ProviderApplication {
    public static void main(String[] args) {
        SpringApplication.run(ProviderApplication.class, args);
    }
}

服务提供方applicaiton.properties配置

#服务名称
spring.application.name=provider
server.port=8081

management.endpoints.web.exposure.include=*
#配置注册中心地址
eureka.client.service-url.defaultZone=http://localhost:8080/eureka

编写服务方controller 此处随意编写只要是一个rest请求

@RestController
public class ProviderUserController {

    @Autowired
    private UserService userService;
    @PostMapping("/user/save")
    public String saveUser(@RequestBody User user) {
        userService.addUser(user);
        return user.toString();
    }

}

服务方介绍完毕

客户端调用pom文件

<?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/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>hystrix</artifactId>
        <groupId>com.zz</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>client</artifactId>
    <description>客户端</description>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>com.zz</groupId>
            <artifactId>common</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>

    </dependencies>

</project>

客户端application.properties

#应用名称
spring.application.name=client
server.port=8082

management.endpoints.web.exposure.include=*

server.provider.name=provider


eureka.client.service-url.defaultZone=http://localhost:8080/eureka

客户端启动类

@SpringBootApplication
@EnableDiscoveryClient
public class ClientApplication {


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

	//此处使用LoadBalance代表使用Riboon进行客户端负载均衡
    @Bean
    @LoadBalanced
    public RestTemplate getRest() {
        return new RestTemplate();
    }

}

客户端调用服务端代码实现类

@RestController
public class ClientUserController {
	
	//服务提供方的spring.application.name
    @Value("${server.provider.name}")
    private String providerName;

    @Autowired
    private RestTemplate restTemplate;
    @GetMapping("/client/get")
    public String getUser() {
        User user = new User();
        user.setId(1L);
        user.setName("zz");
       // String o = restTemplate.postForObject("http://" + "localhost:8081" + "/user/save", user, String.class);
        String o = restTemplate.postForObject("http://" + providerName + "/user/save", user, String.class);
        return o;
    }


}

注册中心
在这里插入图片描述
进行测试访问
http://localhost:8082/client/get 即客户端请求地址,通过服务名称能正常调用到服务提供方 此处只是简单使用可以启动多个服务提供方进行Ribbon的负载均衡测试

问题处理

**在使用过程中如通过服务名调用时提示
No instances available for xx这种错误的时检查客户端pom文件是否引入了

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>

本文中使用的eureka-client版本为3.3.1, 已经内置了ribbon.如果再次引入上方spring-cloud-starter-netflix-ribbon则会提示No instances available for xx

  <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

其他高级特性等待继续学习

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