Eureka架构图
image
PS：
所有的服务提供者和服务调用者都会在注册中心进行注册，服务提供者在注册中心上提供服务，服务调用者在注册中心中获取服务列表。
构建第一个应用
1. 创建一个Eureka服务
导入相关依赖，pom文件如下
4.0.0
com.zgy
first-114
0.0.1-SNAPSHOT
jar
first-114
Demo project for Spring Boot
org.springframework.boot
spring-boot-starter-parent
1.5.13.RELEASE
UTF-8
UTF-8
1.8
org.springframework.cloud
spring-cloud-dependencies
Dalston.SR5
pom
import
org.springframework.boot
spring-boot-starter
org.springframework.cloud
spring-cloud-starter-eureka-server
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-maven-plugin
将注解@EnableEurekaServer加在启动类上
package com.zgy.first114;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
/**
* @EnableEurekaServer：说明该应用是一个Eureka服务器
*/
@SpringBootApplication
@EnableEurekaServer
public class First114Application {
public static void main(String[] args) {
new SpringApplicationBuilder(First114Application.class).web(true).run(args);
}
}
配置文件
server:
port: 8761 #设置服务器端口号为：8761
eureka:
client:
register-with-eureka: false #不注册到其他Eureka服务器上
fetch-registry: false #不在其他Eureka服务器上读取注册信息
启动应用
image
2. 创建服务提供者
导入依赖，pom文件如下
4.0.0
com.zgy
first-police
0.0.1-SNAPSHOT
jar
first-police
Demo project for Spring Boot
org.springframework.boot
spring-boot-starter-parent
1.5.13.RELEASE
org.springframework.cloud
spring-cloud-dependencies
Dalston.SR5
pom
import
UTF-8
UTF-8
1.8
org.springframework.boot
spring-boot-starter
org.springframework.boot
spring-boot-starter-test
test
org.springframework.cloud
spring-cloud-starter-eureka
org.springframework.boot
spring-boot-maven-plugin
将注解@EnableEurekaClient加在启动类上
package com.zgy.firstpolice;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
/**
* @EnableEurekaClient：说明该应用是一个客户端
*/
@SpringBootApplication
@EnableEurekaClient
public class FirstPoliceApplication {
public static void main(String[] args) {
SpringApplication.run(FirstPoliceApplication.class, args);
}
}
package com.zgy.firstpolice;
public class Police {
private Integer id;
private String name;
private String message;
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;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
package com.zgy.firstpolice;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class PoliceController {
@GetMapping("/call/{id}")
public Police call(@PathVariable Integer id){
Police police = new Police();
police.setId(id);
police.setName("张三");
police.setMessage("AAA");
return police;
}
}
配置文件
spring:
application:
name: first-police #定义项目的名称
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/ #将该应用注册到Eureka服务器上
启动应用，然后查看eureka服务器
image
3. 创建服务调用者
引入依赖，pom文件如下
4.0.0
com.zgy
first-person
0.0.1-SNAPSHOT
jar
first-person
Demo project for Spring Boot
org.springframework.boot
spring-boot-starter-parent
1.5.13.RELEASE
UTF-8
UTF-8
1.8
org.springframework.cloud
spring-cloud-dependencies
Dalston.SR5
pom
import
org.springframework.boot
spring-boot-starter
org.springframework.boot
spring-boot-starter-test
test
org.springframework.cloud
spring-cloud-starter-eureka
org.springframework.cloud
spring-cloud-starter-ribbon
org.springframework.boot
spring-boot-maven-plugin
将注解@EnableEurekaClient加在启动类上
package com.zgy.firstperson;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class FirstPersonApplication {
public static void main(String[] args) {
SpringApplication.run(FirstPersonApplication.class, args);
}
}
编写Controller
package com.zgy.firstperson;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
@Configuration
public class TestController {
/*
@LoadBalanced：该RestTemplate具有负载均衡的功能
*/
@Bean
@LoadBalanced
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
@GetMapping("/router")
public String router(){
RestTemplate restTemplate = getRestTemplate();
String json = restTemplate.getForObject("http://first-police/call/100", String.class);
return json;
}
}
配置文件
server:
port: 8081
spring:
application:
name: first-person
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
启动应用，查看eureka服务器
image
访问Controller
image
第一个应用就已经完成，以下是本次程序的结构图
image