1.Eureka在上一章节我们已经创建成功,初始化的Eureka是没有服务注册的。那么这一章节就开始创建服务提供者。
4.0.0
com.example
eureka
0.0.1-SNAPSHOT
jar
eureka
Demo project for Spring Boot
org.springframework.boot
spring-boot-starter-parent
2.0.3.RELEASE
UTF-8
UTF-8
1.8
Finchley.RELEASE
org.springframework.cloud
spring-cloud-starter-netflix-eureka-client
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-dependencies
${spring-cloud.version}
pom
import
org.springframework.boot
spring-boot-maven-plugin
package com.example.eureka;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
//消费者提供
@SpringBootApplication
@EnableEurekaClient //在程序类启动的时候像eureka注册中心注册一个服务
@RestController //restful注解
public class EurekaApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaApplication.class, args);
}
//端口号
@Value("${server.port}")
private String port;
//提供一个hi的测试方法
@RequestMapping(value = "/hi")
private String sayHei(){
return "hello Word"+port+"test";
}
}
yml配置文件配置的相关信息
server:
port: 8091 #设置端口号
spring:
application:
name: service-hi #后续通过这里配置的名字进行调用服务
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/ #表名自己的服务中心的地址
注册完会看到一个叫service-hi的服务端口号为8091 那么就代表我们的服务注册成功了
image.png
服务消费者(Feign与、RestTemplate的调用)
Feign的调用
//在SpringBootApplication启动类上打上@EnableFeignClients注解
package com.example.servicefeignapplication;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients//开启feign服务
public class ServicefeignapplicationApplication {
public static void main(String[] args) {
SpringApplication.run(ServicefeignapplicationApplication.class, args);
}
}
创建一个service接口类去调用服务
package com.example.servicefeignapplication.service;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* @Auther: 创建一个接受服务的接口 FeignClinet表示调用的服务
* @Date: 2018/7/18 0018 09:54
* @Description:
*/
@FeignClient(value = "service-hi")
public interface ServiceTest {
//调用服务名为service-hi的服务方法
@RequestMapping(value = "/hi")
public String say();
}
给web层暴露一个controller可以进行访问方法
package com.example.servicefeignapplication.controller;
import com.example.servicefeignapplication.service.ServiceTest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @Auther: TG
* @Date: 2018/7/18 0018 09:56
* @Description:
*/
@RestController
public class ServiceController {
//这里会进行报错，启动没有任何问题 原因是因为无法识别 差找不到对应的bean
@Autowired
private ServiceTest serviceTest;
@GetMapping(value = "hello")
public String hello(){
System.out.println(serviceTest.say());
return serviceTest.say();
}
}
yml文件的配置
server:
port: 8888
spring:
application:
name: serverBase 服务名
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
2.采用RestTemplate调用服务
启动类
package com.example.serviceribbon;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
@SpringBootApplication
@EnableDiscoveryClient
public class ServiceRibbonApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceRibbonApplication.class, args);
}
//开启负载均衡
@Bean
@LoadBalanced
RestTemplate restTemplate(){
return new RestTemplate();
}
}
service
package com.example.serviceribbon.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
/**
* @Auther: TG
* @Date: 2018/7/17 0017 15:06
* @Description:
*/
@Service
public class RibbonService {
@Autowired
private RestTemplate restTemplate;
//调用service服务中心的数据
public String getMessage(){
System.out.println("调用注册的服务--->");
return restTemplate.getForObject("http://service-hi/hi",String.class);
}
}
package com.example.serviceribbon.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @Auther: TG
* @Date: 2018/7/17 0017 15:09
* @Description:
*/
@RestController
public class RibbonController {
@Autowired
private RibbonService ribbonService;
@RequestMapping(value = "sayBase")
public String sayBase(){
return ribbonService.getMessage();
}
}
yml配置文件配置
server:
port: 80 #设置端口为80
eureka:
client:
serviceUrl:
defaultZone : http://localhost:8761/eureka/
spring:
application:
name: service-ribbon
@EnableEurekaClient采用Eureka服务注册中心的时候采用
@EnableDiscoveryClient使用其他服务注册中心的时候采用