男篮世界杯赌球:spring cloud将spring boot服务注册到

spring cloud将spring boot服务注册到Eureka Server上的方法,cloudeureka

开篇:

我们将前面的springboot整合H2内存数据库,实现单元测试与数据库无关性提供的Restful服务注册到spring cloud的Eureka Server上。

男篮世界杯赌球,一、引入Eureka的Client

</dependencies> 
 <dependency> 
  <groupId>org.springframework.cloud</groupId> 
  <artifactId>spring-cloud-starter-eureka</artifactId> 
 </dependency> 
</dependencies> 
<dependencyManagement> 
 <dependencies> 
  <dependency> 
   <groupId>org.springframework.cloud</groupId> 
   <artifactId>spring-cloud-dependencies</artifactId> 
   <version>Camden.SR3</version> 
   <type>pom</type> 
   <scope>import</scope> 
  </dependency> 
 </dependencies> 
</dependencyManagement> 

二、添加配置文件

# spring boot服务注册到Eureka Server上的应用名称 
spring.application.name=springboot-h2 
eureka.instance.prefer-ip-address=true 
# Eureka Server注册服务的地址 
eureka.client.service-url.defaultZone=http://localhost:8761/eureka 

三、开启Eureka Client支持

package com.chhliu.springboot.h2; 

import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
import org.springframework.cloud.netflix.eureka.EnableEurekaClient; 

@SpringBootApplication 
@EnableEurekaClient 
public class SpringbootH2Application { 

 public static void main(String[] args) { 
  SpringApplication.run(SpringbootH2Application.class, args); 
 } 
} 

四、启动spring boot服务并验证

男篮世界杯赌球 1

通过上面几个步骤,说明我们已经将spring boot的服务注册到了Eureka Server上了!

五、可能出现的问题

如果在服务注册的过程中,发现Connection refused异常,如下:

男篮世界杯赌球 2

有可能是hosts文件中没有加入如下映射关系

127.0.0.1  loaclhost

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持帮客之家。

http://www.bkjia.com/Javabc/1294332.htmlwww.bkjia.comtruehttp://www.bkjia.com/Javabc/1294332.htmlTechArticlespring cloud将spring boot服务注册到Eureka Server上的方法,cloudeureka 开篇: 我们将前面的springboot整合H2内存数据库,实现单元测试与数据库无关性...

详解spring cloud中使用Ribbon实现客户端的软负载均衡,cloudribbon

开篇

本例是在springboot整合H2内存数据库,实现单元测试与数据库无关性和使用RestTemplate消费spring boot的Restful服务两个示例的基础上改造而来

在使用RestTemplate来消费spring boot的Restful服务示例中,我们提到,调用spring boot服务的时候,需要将服务的URL写死或者是写在配置文件中,但这两种方式,无论哪一种,一旦ip地址发生了变化,都需要改动程序,并重新部署服务,使用Ribbon的时候,可以有效的避免这个问题。

前言:

软负载均衡的实现方式有两种,分别是服务端的负载均衡和客户端的负载均衡

服务端负载均衡:当浏览器向后台发出请求的时候,会首先向反向代理服务器发送请求,反向代理服务器会根据客户端部署的ip:port映射表以及负载均衡策略,来决定向哪台服务器发送请求,一般会使用到nginx反向代理技术。

客户端负载均衡:当浏览器向后台发出请求的时候,客户端会向服务注册器(例如:Eureka Server),拉取注册到服务器的可用服务信息,然后根据负载均衡策略,直接命中哪台服务器发送请求。这整个过程都是在客户端完成的,并不需要反向代理服务器的参与。

一、启动Eureka Server

请参考该例:spring cloud中启动Eureka Server

二、启动微服务,并注册到Eureka Server上

spring cloud-将spring boot服务注册到Eureka Server上

为了演示负载均衡的效果,再启动一个为服务,注意需要将端口号改成不一致

三、添加Ribbon支持

1、添加Ribbon的依赖

男篮世界杯赌球 3

2、添加负载均衡支持

package com.chhliu.springboot.restful; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
import org.springframework.boot.web.client.RestTemplateBuilder; 
import org.springframework.cloud.client.loadbalancer.LoadBalanced; 
import org.springframework.cloud.netflix.eureka.EnableEurekaClient; 
import org.springframework.context.annotation.Bean; 
import org.springframework.web.client.RestTemplate; 
@SpringBootApplication 
@EnableEurekaClient 
public class SpringbootRestTemplateApplication { 

  @Autowired 
  private RestTemplateBuilder builder; 

  @Bean 
  @LoadBalanced // 添加负载均衡支持,很简单,只需要在RestTemplate上添加@LoadBalanced注解,那么RestTemplate即具有负载均衡的功能,如果不加@LoadBalanced注解的话,会报java.net.UnknownHostException:springboot-h2异常,此时无法通过注册到Eureka Server上的服务名来调用服务,因为RestTemplate是无法从服务名映射到ip:port的,映射的功能是由LoadBalancerClient来实现的。 
  public RestTemplate restTemplate() { 
    return builder.build(); 
  } 

  public static void main(String[] args) { 
    SpringApplication.run(SpringbootRestTemplateApplication.class, args); 
  } 
} 

3、修改调用微服务的URL

package com.chhliu.springboot.restful.controller; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.web.bind.annotation.GetMapping; 
import org.springframework.web.bind.annotation.PathVariable; 
import org.springframework.web.bind.annotation.RestController; 
import org.springframework.web.client.RestTemplate;  
import com.chhliu.springboot.restful.vo.User; 

@RestController 
public class RestTemplateController { 
  @Autowired 
  private RestTemplate restTemplate; 

  @GetMapping("/template/{id}") 
  public User findById(@PathVariable Long id) {// 将原来的ip:port的形式,改成注册到Eureka Server上的应用名即可 
    User u = this.restTemplate.getForObject("http://springboot-h2/user/"   id, User.class); 
    System.out.println(u); 
    return u; 
  } 
} 

四、查看Eureka Server状态

男篮世界杯赌球 4

五,在浏览器中,多次刷新http://localhost:7904/template/2地址

六、测试结果

7900端口服务:

Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 

7901端口服务:

Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=? 

7904端口服务:

User [id=2, username=user2, name=李四, age=20, balance=100.00] 
2017-01-23 09:58:05.682 INFO 7436 --- [erListUpdater-0] c.netflix.config.ChainedDynamicProperty : Flipping property: springboot-h2.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647 
User [id=2, username=user2, name=李四, age=20, balance=100.00] 
User [id=2, username=user2, name=李四, age=20, balance=100.00] 
User [id=2, username=user2, name=李四, age=20, balance=100.00] 
User [id=2, username=user2, name=李四, age=20, balance=100.00] 
User [id=2, username=user2, name=李四, age=20, balance=100.00] 
User [id=2, username=user2, name=李四, age=20, balance=100.00] 
User [id=2, username=user2, name=李四, age=20, balance=100.00] 
User [id=2, username=user2, name=李四, age=20, balance=100.00] 

从上面的测试结果可以看出,总共调了7904端口服务9次,其中7904端口服务调7900端口服务4次,调7901端口5次,刚好是9次

经过上面的几个步骤,就基本使用Ribbon实现了客户端负载均衡的功能

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持帮客之家。

http://www.bkjia.com/Javabc/1294329.htmlwww.bkjia.comtruehttp://www.bkjia.com/Javabc/1294329.htmlTechArticle详解spring cloud中使用Ribbon实现客户端的软负载均衡,cloudribbon 开篇 本例是在springboot整合H2内存数据库,实现单元测试与数据库无关性和使用...

本文由美洲杯赌球发布于计算机教程,转载请注明出处:男篮世界杯赌球:spring cloud将spring boot服务注册到

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