eureka入門和搭建
- 一、建立eureka-server
-
- 1.pom.xml檔案
- 2.application.yml檔案
- 3.啟動Application.java
- 二、建立用戶端 client1
-
- 1.pom.xml
- 2.application.yml
- 3.Controller
- 4.ClientApplication.java
- 三、建立一個子產品調用這個eureka接口
-
- 1.建立Controller
- 2.Application.java
- 3.application.yml
- 4.以上 eureka-server和eureka-client都啟動後再次啟動最後的Application，然後通路
- 四.總結
一、建立eureka-server
1.pom.xml檔案
pom.xml檔案：
<?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>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</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>Hoxton.SR7</spring-cloud.version>
</properties>
<dependencies>
<!-- 引入eureka-server-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</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>
2.application.yml檔案
server:
port: 8080
eureka:
client:
#是否将自己注冊到Eureka Server,預設為true。由于目前就是server，故而設定成false，表明該服務不會向eureka注冊自己的資訊
register-with-eureka: false
#是否從eureka server擷取注冊資訊，預設為true。由于單節點，不需要同步其他節點資料，用false
fetch-registry: false
#設定服務注冊中心的URL，用于client和server端互動
service-url:
defaultZone: http://localhost:8080/eureka/
3.啟動Application.java
@SpringBootApplication(scanBasePackages = "com")
@EnableEurekaServer //标注eureka 服務端
public class ServerApplication {
public static void main(String[] args) {
SpringApplication.run(ServerApplication.class, args);
}
}
二、建立用戶端 client1
1.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 https://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>2.3.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>eureka-clinet1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>eureka-clinet1</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR7</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- eureka client引用 -->
<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>
2.application.yml
eureka:
client:
registerWithEureka: true #服務注冊，是否将自己注冊到Eureka服務中
fetchRegistry: true #服務發現，是否從Eureka中擷取注冊資訊
serviceUrl: #Eureka用戶端與Eureka服務端的互動位址，高可用狀态配置對方的位址，單機狀态配置自己（如果不配置則預設本機8761端口）
defaultZone: http://localhost:8080/eureka/
server:
port: 8081
spring:
application:
name: service-1 #服務名稱
3.Controller
@RequestMapping("/person")
@RestController
public class PersonController {
@RequestMapping("/list")
public Map getPersion(){
Map map = new HashMap();
map.put("zhangsan",12);
map.put("lisi","16");
return map;
}
}
4.ClientApplication.java
@SpringBootApplication(scanBasePackages = "com")
@EnableDiscoveryClient //辨別啟用服務注冊和發現
public class ClinetApplication {
public static void main(String[] args) {
SpringApplication.run(ClinetApplication.class, args);
}
}
三、建立一個子產品調用這個eureka接口
1.建立Controller
@RequestMapping("/person")
@RestController
public class PersonController {
//引用restTemplate來調用
@Autowired
private RestTemplate restTemplate;
@RequestMapping("/list")
public Map getPersion(){
//引用eureka用戶端注冊的服務執行個體名稱 + 接口名來調用接口
Map forObject = restTemplate.getForObject("http://service-1/person/list", Map.class);
return forObject;
}
}
2.Application.java
@SpringBootApplication(scanBasePackages = "com")
@EnableDiscoveryClient
public class Client3Application {
@Bean
@LoadBalanced //開啟負載均衡的功能
RestTemplate restTemplate(){
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(Client3Application.class, args);
}
}
3.application.yml
eureka:
client:
registerWithEureka: false #服務注冊，是否将自己注冊到Eureka服務中
fetchRegistry: true #服務發現，是否從Eureka中擷取注冊資訊
serviceUrl: #Eureka用戶端與Eureka服務端的互動位址，高可用狀态配置對方的位址，單機狀态配置自己（如果不配置則預設本機8761端口）
defaultZone: http://localhost:8080/eureka/
server:
port: 8088
4.以上 eureka-server和eureka-client都啟動後再次啟動最後的Application，然後通路
http://127.0.0.1:8088/person/list
顯示内容：
四.總結
實際應用中可以将多個用戶端部署至多個伺服器，來達到高可用和提升伺服器承載量。
參考目前項目位址：
https://gitee.com/wangyue123com_admin/eureka-demo.git
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