Spring Cloud dan Spring Boot. Bagian 1: Menggunakan Server Eureka

Kami mengundang siswa masa depan kursus Pengembang Kerangka Musim Semi dan semua orang ke pelajaran online terbuka tentang topik "Pengantar awan, membuat kluster di Mongo DB Atlas018" . Peserta, bersama dengan seorang guru ahli, akan berbicara tentang jenis cloud dan menyiapkan cluster Mongo DB gratis untuk proyek mereka.



Dan sekarang kami membagikan kepada Anda terjemahan tradisional dari artikel tersebut.

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Pada artikel ini, kita akan berbicara tentang cara menginstal dan mengkonfigurasi penemuan layanan untuk layanan mikro Java.

Apa itu Server Eureka?

Server Eureka adalah penemuan layanan untuk layanan mikro Anda. Aplikasi klien dapat mendaftar sendiri dengannya, dan layanan mikro lainnya dapat mengakses Server Eureka untuk menemukan layanan mikro yang mereka butuhkan.

Eureka Server Discovery Server IP- .

Eureka Server pom.xml



.

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

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

Eureka Server

https://start.spring.io . , Group, Artifact, / . "Generate Project" zip-. IDE Maven-.

• Eureka Server

  
  
  
  
  

• Web

  
  
  
  
  

• Actuator

  
  
  
  
  

, 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/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>2.0.7.RELEASE</version>
       <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.example.eureka.server</groupId>
   <artifactId>eureka-server</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>eureka-server</name>
   <description>Demo project for Spring Boot</description>

   <properties>
       <java.version>1.8</java.version>
       <spring-cloud.version>Finchley.SR2</spring-cloud.version>
   </properties>

   <dependencies>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-actuator</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-netflix-eureka-server</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>${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>
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

​ EurekaServerApplication.java



@EnableEurekaServer



, .

package com.example.eureka.server.eurekaserver;

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

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {

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

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

application.properties



, src/main/resources



, .

spring.application.name=eureka-server
server.port=8761
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

• spring.application.name
  
  
  
  — .

  
  
  
  
  

• server.port
  
  
  
  — , , (8761).

  
  
  
  
  

• eureka.client.register-with-eureka
  
  
  
  — , Eureka Server.

  
  
  
  
  

• eureka.client.fetch-registry
  
  
  
  — .

  
  
  
  
  

Eureka Java- http://localhost:8761/ 

, Eureka Server , .

Eureka Server

https://start.spring.io . , Group, Artifact, / . "Generate Project" zip-. IDE Maven-.

• DevTools

  
  
  
  
  

• Actuator

  
  
  
  
  

• Discovery 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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
     <version>2.0.7.RELEASE</version>
     <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.example.eureka.client</groupId>
  <artifactId>EurekaClientApplication</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>EurekaClientApplication</name>
  <description>Demo project for Spring Boot</description>
 
  <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.SR2</spring-cloud.version>
  </properties>
 
  <dependencies>
     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
     </dependency>
     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
     </dependency>
     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
     </dependency>
     <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-netflix-eureka-client</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>
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

EurekaClientApplication.java



@EnableDiscoveryClient



, .

package com.example.eureka.client.application;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class EurekaClientApplication {

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

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

REST- 

HelloWorldController



com.example.eureka.client.application



GET- .

package com.example.eureka.client.application;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloWorldController {

   @GetMapping("/hello-worlds/{name}")
   public String getHelloWorld(@PathVariable String name) {
       return "Hello World " + name;
   }
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

application.properties



, src/main/resources, .

spring.application.name=eureka-client-service
server.port=8081
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

eureka.client.service-url.defaultZone



Eureka Server, .

, Eureka Server . Java- Eureka Server http://localhost:8761/. , Eureka Server.

Eureka Server . (Distributed Tracing) Spring Boot-.

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« Spring Framework».



- « , Mongo DB Atlas018».