1.服务注册和发现Eureka
可以用作服务治理。
2.首先我们建立一个父子工程
最外层是forezp
其下面建立四个子工程
eureka-servereureka-clienteureka-client1eureka-ribbon-client
3.forezp工程相关
1.forezp pom文件如下
4.0.0 org.springframework.boot spring-boot-starter-parent 2.1.5.RELEASE com.example forezp 0.0.1-SNAPSHOT forezp Demo project for Spring Boot UTF-8 UTF-8 1.8 Dalston.SR1 org.springframework.cloud spring-cloud-dependencies ${spring-cloud.version}} pom import euraka-client euraka-server eureka-ribbon-client euraka-client2
4.Eureka的服务中心:eureka-server相关
1.pom文件
4.0.0 com.example forezp 0.0.1-SNAPSHOT com.example euraka-server 0.0.1-SNAPSHOT euraka-server Demo project for Spring Boot 1.8 Greenwich.SR1 org.springframework.cloud spring-cloud-starter-netflix-eureka-server org.springframework.boot spring-boot-starter-test test org.springframework.cloud spring-cloud-dependencies ${spring-cloud.version} pom import org.springframework.boot spring-boot-maven-plugin
2.application.properties文件
server.port=8761
eureka.instance.hostname=localhost
#防止自己注册自己
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
#eureka的注册地址
eureka.client.service-url.default-zone=http://${eureka.instance.hostname}:${server.port}/eureka/}
3.需要在启动类添加 @EnableEurekaServer 注解来开启注册服务
package com.example.eurakaserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class EurakaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurakaServerApplication.class, args);
}
}
5.eureka-client和eureka-client1用来提供服务
这两个子工程其实区别不大，只是为了验证实现负载均衡。
1.pom文件
4.0.0 com.example forezp 0.0.1-SNAPSHOT com.example euraka-client2 0.0.1-SNAPSHOT euraka-client2 Demo project for Spring Boot 1.8 Greenwich.SR1 org.springframework.boot spring-boot-starter-web org.springframework.cloud spring-cloud-starter-netflix-eureka-client org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test org.springframework.cloud spring-cloud-dependencies ${spring-cloud.version} pom import org.springframework.boot spring-boot-maven-plugin
2.新建一个ApiController类
package com.example.eurakaclient2;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ApiController {
@Value("${server.port}")
String port;
@GetMapping("/hi")
public String home(@RequestParam String name1){
return "hi "+name1+"i am a port:"+port;
}
}
3.eureka-client 的 apllication.properties配置如下
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/ server.port=8762 spring.application.name=eureka-client
4.eureka-client2的 apllication.properties配置如下
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/ server.port=8763 spring.application.name=eureka-client
5.需要在启动类添加注解 @EnableEurekaClient，开启服务提供
package com.example.eurakaclient2;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class EurakaClient2Application {
public static void main(String[] args) {
SpringApplication.run(EurakaClient2Application.class, args);
}
}
6.eureka-ribbon-client工程相关
1.pom文件
4.0.0 com.example forezp 0.0.1-SNAPSHOT com.example eureka-ribbon-client 0.0.1-SNAPSHOT eureka-ribbon-client Demo project for Spring Boot 1.8 Greenwich.SR1 org.springframework.boot spring-boot-starter-web org.springframework.cloud spring-cloud-starter-netflix-ribbon org.springframework.cloud spring-cloud-starter-netflix-eureka-client org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test org.springframework.cloud spring-cloud-dependencies ${spring-cloud.version} pom import org.springframework.boot spring-boot-maven-plugin
2.applicaiton.properties配置文件如下
spring.application.name=eureka-ribbon-client server.port=8764 eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
3.新建RibbonConfig类，在这里注入RestTemplate类同时开启负载均衡
package com.example.eurekaribbonclient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class RibbonConfig {
@Bean
@LoadBalanced
RestTemplate restTemplate(){
return new RestTemplate();
}
}
4.新建service层，调用eureka-client （eureka-client1）提供的restful接口，其中 eureka-client 为 eureka-client （eureka-client1）注册在 eureka-service上的serviceId信息，如果没有配置serviceId,默认使用spring.application.name
package com.example.eurekaribbonclient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
@Service
public class RibbonService {
@Autowired
RestTemplate restTemplate;
public String hi(String name){
return restTemplate.getForObject("http://eureka-client/hi?name1="+name,String.class);
}
}
5.新建controller层，调用RibbonService为我们提供的方法
package com.example.eurekaribbonclient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class RibbonController {
@Autowired
RibbonService ribbonService;
@GetMapping("/hi")
public String hi(@RequestParam(required = false,defaultValue = "forezp")String name){
return ribbonService.hi(name);
}
}
6.同时也需要在启动类添加@EnableEurekaClient注解
package com.example.eurekaribbonclient;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class EurekaRibbonClientApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaRibbonClientApplication.class, args);
}
}
7.验证
1.按照顺序启动工程
2.浏览器访问 http://localhost:8761/
可以看到EUREKA-CLIENT 和 EUREKA-RIBBON-CLIENT已经注册进来了
3.我们访问 http://localhost:8764/hi?name=forezp 两次
可以看到 页面分别返回
hi forezpi am a port:8762
hi forezpi am a port:8763
这样验证了我们实现了负载均衡。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。