史上最详细从零开始SpringCloud Eureka搭建与服务调用

于 2019-04-12 12:00:51 发布
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文章标签： springCloud Eureka
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本文链接：https://blog.youkuaiyun.com/qq_24018663/article/details/89225579

1、创建maven主工程

在其pom文件添加依赖，spring Boot版本为2.0.3.RELEASE，Spring Cloud版本为Finchley.RELEASE。这个pom文件作为父pom文件，起到依赖版本控制的作用，其他module工程继承该pom，不再赘述。

 

maven主工程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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.company</groupId>
    <artifactId>cl-eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <name>cl-eureka</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/>
    </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>Finchley.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <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>${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>

maven主工程创建完毕

===============================分割线===============================

2创建eureka注册中心eureka-server

在maven主工程上点击右键-new-module

完善eureka-server的pox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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.company</groupId>
    <artifactId>eureka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka-server</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>com.company</groupId>
        <artifactId>cl-eureka</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

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

</project>

在主工程的pom文件中添加eureka-server module依赖

<modules> 
<module>eureka-server</module> 
</modules>

打开eureka-server的入口函数，添加@EnableEurekaServer注解

新建yml配置文件

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

spring:
  application:
    name: eurka-server

启动EurekaServerApplication工程，访问 http://localhost:8761

出现此界面，说明eureka-server注册中心搭建完成。

===============================分割线===============================

3搭建服务提供者并注册到eureka中

和搭建eureka-server一样，新建一个module作为服务提供者

一路next到finish。module新建完毕后，添加eure-provide的pom依赖

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.company</groupId>
    <artifactId>service-provide</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>service-provide</name>
    <description>Demo project for Spring Boot</description>

    <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>
        <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>

 打开maven主工程pom文件，添加该module依赖

<module>eureka-provide</module>

在eureka-provide中添加yml配置文件

server:
  port: 8762
  context-path: /eurekaprovide

spring:
  application:
    name: service-provide

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  instance:
    instance-id:  eureka-provide8762  #自定义eureka的注册名称
    prefer-ip-address: true           #访问路径显示IP地址

打开入口函数，在里面写个测试方法，并添加以下注解

@EnableEurekaClient
@RestController
@EnableDiscoveryClient
package com.company.eurekaprovide;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@EnableEurekaClient //本服务启动后会自动注册进eureka服务中
@RestController
@EnableDiscoveryClient //服务发现
public class EurekaProvideApplication {

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

    @Value("${server.port}")
    String port;

    @RequestMapping(value = "/dept/get/{name}", method = RequestMethod.GET)
    public String get(@PathVariable("name") String name)
    {
        return "hi " + name + " ,i am from port:" + port;
    }

}

访问http://localhost:8761/

application中出现SERVICE-PROVIDE，说明服务注册成功

 

访问http://localhost:8762/eurekaprovide/dept/get/hello,eureka 

测试写的方法是否成功

至此，消费者成功注册到eureka中

===============================分割线===============================

4新建消费者，并注入到eureka中

按照同样的步骤新建一个module，为消费者（只说关键步骤）

配置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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.company</groupId>
    <artifactId>eureka-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka-consumer</name>
    <description>消费者</description>

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

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </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>

配置yml文件

server:
  port: 80
  context-path: /consumer

spring:
  application:
    name: consumer

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  instance:
    instance-id:  consumer80 #自定义eureka的注册名称
    prefer-ip-address: true #访问路径显示IP地址

主函数添加@EnableEurekaClient注解

package com.company.eurekaconsumer;

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

@SpringBootApplication
@EnableEurekaClient
public class EurekaConsumerApplication {

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

}

在maven主函数中添加module依赖

<module>eureka-consumer</module>

启动EurekaConsumer工程，访问http://localhost:8761/

出现选中的服务，说明消费者、提供者都成功注册到eurek中

===============================分割线===============================

5消费者通过eureka中暴露的提供者接口访问服务

在eurek-consume中新建两个包cfgbeans、controller

在cfgbeans包中新建一个ConfigBean类

配置类：

package com.company.eurekaconsumer.cfgbeans;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class ConfigBean //boot -->spring   applicationContext.xml --- @Configuration配置   ConfigBean = applicationContext.xml
{ 
	@Bean
	@LoadBalanced//Spring Cloud Ribbon是基于Netflix Ribbon实现的一套客户端       负载均衡的工具。
	public RestTemplate getRestTemplate()
	{
		return new RestTemplate();
	}
	
}

在controller包中新建一个ConsumeController测试类：

把访问地址定义为eureka中暴露的名称http://SERVICE-PROVIDE，通过访问该地址，来测试服务是否畅通

package com.company.eurekaconsumer.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;


@RestController
public class ConsumeController {

    @Autowired
    private RestTemplate restTemplate;

    private static final String REST_URL_PREFIX = "http://SERVICE-PROVIDE";

    @RequestMapping(value = "/getRest/{name}", method = RequestMethod.GET)
    public String getRest(@PathVariable("name") String name) {
        return restTemplate.getForObject(  REST_URL_PREFIX+"/eurekaprovide/dept/get/" + name, String.class);
    }



}

重启消费者服务，访问测试类http://localhost/consumer/getRest/hello

通过访问eureka暴露的接口，可以访问成功

完毕

完整源码下载地址：https://download.youkuaiyun.com/download/qq_24018663/11109732

 

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