場景

關于Eureka

1.提供了Eureka服務端與客戶端。

2.主要用于服務管理。

Eureka架構

構建第一個應用

1.建立服務器端。

2.建立服務提供者。

3.建立服務調用者。

實現

建立服務器端

打開eclipse，新建Maven Project--create a simple project

打開pom.xml，添加依賴

<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.badao.cloud</groupId><artifactId>eureka-server</artifactId><version>0.0.1-SNAPSHOT</version><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Dalston.SR3</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-config</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka-server</artifactId></dependency></dependencies> </project>

新建啟動類

代碼：

package com.badao.cloud;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;@SpringBootApplication @EnableEurekaServer public class ServerApplication {public static void main(String[] args) throws Exception {SpringApplication.run(ServerApplication.class, args);}}

注：

@EnableEurekaServer注解是配置為服務端

在resource下新建配置文件application.yml

修改端口號并使其注冊為服務器端。

server:port: 8761 eureka:client:register-with-eureka: falsefetch-registry: false

運行啟動類效果：

建立服務提供者

打開eclipse，新建Maven Project--create a simple project

打開pom.xml

<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.bao.cloud</groupId><artifactId>eureka-provide</artifactId><version>0.0.1-SNAPSHOT</version><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Dalston.SR3</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-config</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency></dependencies> </project>

新建啟動類

package com.badao.cloud;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication public class ProvideApplication {public static void main(String[] args) throws Exception {SpringApplication.run(ProvideApplication.class, args);}}

新建實體類

package com.badao.cloud;public class Police {private Integer id;private String name;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

新建Controller

package com.badao.cloud;import org.apache.tomcat.util.http.fileupload.ParameterParser; import org.springframework.http.MediaType;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;@RestController public class PoliceController {/*** 指定警員id出警* @param id* @return*/@RequestMapping(value="/call/{id}",method=RequestMethod.GET,produces=MediaType.APPLICATION_JSON_VALUE)public Police call(@PathVariable Integer id){Police police = new Police();police.setId(id);police.setName("警員"+id);return police;} }

運行啟動類，默認8080端口，打開瀏覽器輸入：

http://localhost:8080/call/1

?

將服務提供者注冊到服務器端

打開服務提供者的啟動類添加注解：

@EnableEurekaClient

完整代碼：

package com.badao.cloud;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication @EnableEurekaClient public class ProvideApplication {public static void main(String[] args) throws Exception {SpringApplication.run(ProvideApplication.class, args);}}

在服務提供者項目下新建配置文件application.yml

spring:application:name: eureka-provide eureka:client:serviceUrl:defaultZone: http://localhost:8761/eureka/

?重新運行服務提供者的啟動類和服務端的啟動類

查看服務器端，已經成功注冊：

新建服務調用者

打開eclipse，新建Maven Project--create a simple project

?

打開項目的pom.xml

<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.badao.cloud</groupId><artifactId>eureka-call</artifactId><version>0.0.1-SNAPSHOT</version><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Dalston.SR3</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-config</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-ribbon</artifactId></dependency></dependencies></project>

新建啟動類

package com.badao.cloud;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication @EnableEurekaClient public class CallApplication {public static void main(String[] args) throws Exception {SpringApplication.run(CallApplication.class, args);}}

新建Controller

package com.badao.cloud;import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.client.RestTemplate;@Controller @Configuration public class TestController {@Bean@LoadBalancedpublic RestTemplate getRestTemplate() {return new RestTemplate();}@GetMapping("/router")@ResponseBodypublic String router() {RestTemplate tpl = getRestTemplate();String json = tpl.getForObject("http://eureka-provide/call/1", String.class);return json;}}

新建配置文件application.yml

server:port: 8081 spring:application:name: eureka-call eureka:client:serviceUrl:defaultZone: http://localhost:8761/eureka/

打開瀏覽器輸入：

http://localhost:8081/router

源碼下載

https://download.csdn.net/download/badao_liumang_qizhi/11206065

總結

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