SpringCloud的入门学习之Eureka（高可用注册中心HA）构建Provider服务、Consumer服务

1、在高可用的Eureka注册中心中构建provider服务。

　　使用springboot的多环境配置，来搭建Eureka的高可用集群式部署。由于使用的是maven构建的springboot项目，所以首先引入pom.xml配置文件，这里需要注意的是springboot的版本、springcloud的版本对应，不然会出现一个版本不对应错误，稍后可以贴一下错误。我使用的springboot版本是2.2.0的，springcloud版本是Hoxton.RC1。

 <?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
     https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.</modelVersion>
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.2..RELEASE</version>
         <relativePath />
         <!-- lookup parent from repository -->
     </parent>
     <groupId>com.bie</groupId>
     <artifactId>springcloud-eureka-provider</artifactId>
     <version>0.0.-SNAPSHOT</version>
     <name>springcloud-eureka-provider</name>
     <description>Demo project for Spring Boot</description>

     <properties>
         <project.build.sourceEncoding>UTF-</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
         <spring-cloud.version>Hoxton.RC1</spring-cloud.version>
         <maven-jar-plugin.version>3.1.</maven-jar-plugin.version>
     </properties>

     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <!-- springcloud eureka 客户端 -->
         <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
             <exclusions>
                 <exclusion>
                     <groupId>org.junit.vintage</groupId>
                     <artifactId>junit-vintage-engine</artifactId>
                 </exclusion>
             </exclusions>
         </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>

     <repositories>
         <repository>
             <id>spring-milestones</id>
             <name>Spring Milestones</name>
             <url>https://repo.spring.io/milestone</url>
         </repository>
     </repositories>

 </project>

修改配置文件application.properties。内容如下所示：

 # 配置项目名称
 spring.application.name=springcloud-eureka-provider

 # 配置端口号
 spring.port=

 # 客户端需要向服务端进行注册,必须配置服务端的地址。知道服务端在那里。
 #设置服务注册中心地址,可以将集群中的所有节点列处理。
 eureka.client.serviceUrl.defaultZone=http://eureka1:8761/eureka/,http://eureka2:8761/eureka/

将Eureka客户端的的注解加到启动类上面。

 package com.bie;

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

 @EnableEurekaClient // Eureka客户端
 @SpringBootApplication
 public class SpringCloudApplication {

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

 }

注意，需要将服务器ip地址和别称映射加到hosts配置文件里面的。C:\Windows\System32\drivers\etc\hosts。

 192.168.110.133 eureka1
 192.168.110.134 eureka2

将配置日志管理的配置文件，logback.xml。如下所示。

 <?xml version="1.0" encoding="UTF-8" ?>
 <configuration>
     <!--定义日志文件的存储地址 勿在 LogBack 的配置中使用相对路径 -->
     <property name="LOG_HOME" value="${catalina.base}/logs/" />
     <!-- 控制台输出 -->
     <appender name="Stdout"
         class="ch.qos.logback.core.ConsoleAppender">
         <!-- 日志输出编码 -->
         <layout class="ch.qos.logback.classic.PatternLayout">
             <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符 -->
             <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{} -
                 %msg%n
             </pattern>
         </layout>
     </appender>
     <!-- 按照每天生成日志文件 -->
     <appender name="RollingFile"
         class="ch.qos.logback.core.rolling.RollingFileAppender">
         <rollingPolicy
             class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
             <!--日志文件输出的文件名 -->
             <FileNamePattern>${LOG_HOME}/server.%d{yyyy-MM-dd}.log
             </FileNamePattern>
             <MaxHistory></MaxHistory>
         </rollingPolicy>
         <layout class="ch.qos.logback.classic.PatternLayout">
             <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符 -->
             <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{} -
                 %msg%n
             </pattern>
         </layout>
         <!--日志文件最大的大小 -->
         <triggeringPolicy
             class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
             <MaxFileSize>10MB</MaxFileSize>
         </triggeringPolicy>
     </appender>

     <!-- 日志输出级别 -->
     <root level="DEBUG">
         <appender-ref ref="Stdout" />
         <appender-ref ref="RollingFile" />
     </root>

 </configuration>

2、开始开发服务，向Eureka Server注册中心服务端进行服务的注册。

首先，启动主启动类，可以看到已经将服务注册到Eureka Server注册中心。如下所示：

首先，配置一个实体类，然后开发一个控制层接口方法。

 package com.bie.po;

 /**
  *
  * @author biehl
  *
  */
 public class User {

     private int id;
     private String username;
     private int age;

     public int getId() {
         return id;
     }

     public void setId(int id) {
         this.id = id;
     }

     public String getUsername() {
         return username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public int getAge() {
         return age;
     }

     public void setAge(int age) {
         this.age = age;
     }

     public User(int id, String username, int age) {
         super();
         this.id = id;
         this.username = username;
         this.age = age;
     }

     public User() {
         super();
     }

     @Override
     public String toString() {
         return "User [id=" + id + ", username=" + username + ", age=" + age + "]";
     }

 }

 package com.bie.controller;

 import java.util.ArrayList;
 import java.util.List;

 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;

 import com.bie.po.User;

 /**
  *
  * @author biehl
  *
  */
 @RestController
 public class UserController {

     @RequestMapping(value = "/showUser")
     public List<User> getListUser() {
         List<User> list = new ArrayList<User>();

         User user = new User();
         user.setId();
         user.setUsername("zhangsan");
         user.setAge();
         list.add(user);

         User user2 = new User();
         user2.setId();
         user2.setUsername("lisi");
         user2.setAge();
         list.add(user2);

         User user3 = new User();
         user3.setId();
         user3.setUsername("wangwu");
         user3.setAge();
         list.add(user3);

         return list;
     }
 }

最后，开发完服务中的接口以后，启动主启动类，将服务注册到注册中心当中去。查看演示效果，如下所示：

开发服务提供者，通过浏览器访问接口成功，代表成功将服务注册到Eureka Server注册中心。

3、在高可用的Eureka注册中心中构建consumer服务。由于consumer服务也是Eureka的客户端，所以pom.xml配置文件这里省略了。logback.xml配置文件一致即可，这里省略了。启动主类一致，这里也省略了，都需要加上@EnableEurekaClient，代表Eureka的客户端。

注意：服务的消费者与提供者都需要在Eureka注册中心注册。consumer服务也需要去Eureka Server服务端进行注册，这样才可以去消费Eureka Server注册中心的服务。

修改配置文件application.properties。内容如下所示：

 # 配置项目名称
 spring.application.name=springcloud-eureka-consumer

 # 配置端口号
 spring.port=

 # 客户端需要向服务端进行注册,必须配置服务端的地址。知道服务端在那里。
 #设置服务注册中心地址,可以将集群中的所有节点列处理。
 eureka.client.serviceUrl.defaultZone=http://eureka1:8761/eureka/,http://eureka2:8761/eureka/

consumer服务调用provider服务，需要知道provider服务的基本信息，比如ip地址、端口等等。SpringCloud微服务中如何知道调用服务的基本信息呢？人家封装好了类让你用啦，抓紧学吧，孩子。

通过LoadBalancerClient 获取到服务提供方的ip地址和端口号，拼接出URL，进行方法的调用。

 package com.bie.service;

 import java.util.List;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.cloud.client.ServiceInstance;
 import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
 import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 import org.springframework.web.client.RestTemplate;

 import com.bie.po.User;

 /**
  *
  * @author biehl
  *
  */
 @Service
 public class UserService {

     // SpringCloud提供的负载均衡的对象。
     // ribbon的负载均衡器。通过该对象可以获取调用服务的ip地址、端口号等等信息。
     // 通过服务的名称获取到调用服务的ip地址、端口号等等信息。
     @Autowired
     private LoadBalancerClient loadBalancerClient;

     public List<User> getListUser() {
         // 1、选择调用的服务的名称
         // 注意,ServiceInstance封装了服务的基本信息,包含ip地址、端口号
         ServiceInstance serviceInstance = this.loadBalancerClient.choose("springcloud-eureka-provider");
         // 2、拼接访问服务的URL。StringBuffer线程安全的,StringBuilder线程不安全,效率高
         StringBuilder sb = new StringBuilder();
         // 访问地址,http://127.0.0.1:8080/showUser
         sb.append("http://").append(serviceInstance.getHost()).append(":").append(serviceInstance.getPort())
                 .append("showUser");

         // 3、向URL发送请求。SpringMVC RestTemplate
         RestTemplate restTemplate = new RestTemplate();
         // 处理接口的返回值,参数类型的定义
         ParameterizedTypeReference<List<User>> parameterizedTypeReference = new ParameterizedTypeReference<List<User>>() {
         };

         // 4、封装了返回值信息。
         // 参数1是URL。
         // 参数2是http请求类型。
         // 参数3是参数的传递。
         // 参数3是返回值类型的封装。
         ResponseEntity<List<User>> responseEntity = restTemplate.exchange(sb.toString(), HttpMethod.GET, null,
                 parameterizedTypeReference);

         // 5、返回调用成功以后的返回值。
         List<User> list = responseEntity.getBody();
         return list;
     }

 }

开发消费端的控制层，可以调用消费端的业务service层。

 package com.bie.controller;

 import java.util.ArrayList;
 import java.util.List;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;

 import com.bie.po.User;
 import com.bie.service.UserService;

 /**
  *
  * @author biehl
  *
  */
 @RestController
 public class UserController {

     @Autowired
     private UserService userService;

     @RequestMapping(value = "/consumer")
     public List<User> getListUser() {
         List<User> list = new ArrayList<User>();
         list = userService.getListUser();
         return list;
     }
 }

启动你的高可用Eureka Server，启动你的服务提供方Provider，启动你的服务消费方Consumer。

然后你发现服务提供方的返回信息，在服务消费方也可以完全访问到，从而实现服务的远程调用。

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作者：别先生

博客园：https://www.cnblogs.com/biehongli/

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