Springboot + Springcloud 配置一个服务多实例负载均衡实现（fegin）

╰+攻爆jí腚メ 2022-06-02 00:09 90阅读 0赞

网上资料中可能会出先很多的问题  最终可是是pom里面的版本问题   贴上我实际运行的配置环境。

***Server***

pom文件

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Dalston.RELEASE</spring-cloud.version>
    </properties>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>1.5.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

application.yml配置

server: port: 8761
    eureka: instance: hostname: 192.168.10.109
        prefer-ip-address: true
      client: registerWithEureka: false
        fetchRegistry: false
        serviceUrl: defaultZone: http://${
      eureka.instance.hostname}:8761/eureka/
    spring: application: name: spring-cloud-eureka

Application.class类

@SpringBootApplication
    @EnableEurekaServer
    public class Application {
        public static void main(String[] args){
            SpringApplication.run(Application.class,args);
        }
    }

***client -----------生产者***

pom文件

application.yml配置文件

spring: application: name: service
    server: port: 8762
    
    
    
    eureka: client: serviceUrl: defaultZone: http://192.168.10.109:8761/eureka/

生产者的controller类也就是要发布的方法

@RestController
    public class CloudController {
    
        @RequestMapping("/cloud")
        public String cloud(String name){
            return "hello"+name+"---->2";
        }
    }

client可以使用同一个服务多个实例的方法 来解决单点故障问题   只要更改server.port端口重新启动一下  就可以创建另一个实例

<table style="border-collapse:collapse; border-spacing:0px; background-color:rgb(241,241,241); width:1873px; max-width:100%; margin-bottom:20px; color:rgb(52,48,45); font-family:varela_roundregular,sans-serif; font-size:14px"> 
 <thead style=""> 
  <tr style=""> 
   <th style="padding:8px; text-align:left; line-height:1.42857; vertical-align:bottom; border-top:0px; border-bottom:2px solid rgb(52,48,45); background-color:rgb(60,56,52); color:rgb(241,241,241)"> Application</th> 
   <th style="padding:8px; text-align:left; line-height:1.42857; vertical-align:bottom; border-top:0px; border-bottom:2px solid rgb(52,48,45); background-color:rgb(60,56,52); color:rgb(241,241,241)"> AMIs</th> 
   <th style="padding:8px; text-align:left; line-height:1.42857; vertical-align:bottom; border-top:0px; border-bottom:2px solid rgb(52,48,45); background-color:rgb(60,56,52); color:rgb(241,241,241)"> Availability Zones</th> 
   <th style="padding:8px; text-align:left; line-height:1.42857; vertical-align:bottom; border-top:0px; border-bottom:2px solid rgb(52,48,45); background-color:rgb(60,56,52); color:rgb(241,241,241)"> Status</th> 
  </tr> 
 </thead> 
 <tbody style=""> 
  <tr style=""> 
   <td style="padding:8px; vertical-align:top; line-height:1.42857; border-top:1px solid rgb(52,48,45); background-color:rgb(245,245,245)"> <span style="">SERVICE-HI</span></td> 
   <td style="padding:8px; vertical-align:top; line-height:1.42857; border-top:1px solid rgb(52,48,45); background-color:rgb(245,245,245)"> <span style="">n/a</span>&nbsp;(2)</td> 
   <td style="padding:8px; vertical-align:top; line-height:1.42857; border-top:1px solid rgb(52,48,45); background-color:rgb(245,245,245)"> <span style=""></span>(2)</td> 
   <td style="padding:8px; vertical-align:top; line-height:1.42857; border-top:1px solid rgb(52,48,45); background-color:rgb(245,245,245)"> <span style="">UP</span>&nbsp;(2) -&nbsp;<a href="http://youxiong:8763/info" style="background:transparent; color:rgb(95,161,52); text-decoration:none" rel="nofollow">YouXiong:service:8763</a>&nbsp;,&nbsp;<a href="http://youxiong:8762/info" style="background:transparent; color:rgb(95,161,52); text-decoration:none" rel="nofollow">YouXiong:service:8762</a></td> 
  </tr> 
  <tr style=""> 
   <td style="padding:8px; vertical-align:top; line-height:1.42857; border-top:1px solid rgb(52,48,45)"> <span style="">SERVICE-RIBBON</span></td> 
   <td style="padding:8px; vertical-align:top; line-height:1.42857; border-top:1px solid rgb(52,48,45)"> <span style="">n/a</span>&nbsp;(2)</td> 
   <td style="padding:8px; vertical-align:top; line-height:1.42857; border-top:1px solid rgb(52,48,45)"> <span style=""></span>(2)</td> 
   <td style="padding:8px; vertical-align:top; line-height:1.42857; border-top:1px solid rgb(52,48,45)"> <span style="">UP</span>&nbsp;(2) -&nbsp;<a href="http://youxiong:8764/info" style="background:transparent; color:rgb(95,161,52); text-decoration:none" rel="nofollow">YouXiong</a>&nbsp;,&nbsp;<a href="http://youxiong:8764/info" style="background:transparent; color:rgb(95,161,52); text-decoration:none" rel="nofollow">YouXiong:service-fegin:8764</a></td> 
  </tr> 
 </tbody> 
</table>

application.class类

@SpringBootApplication
    @EnableEurekaClient
    public class Application {
        public static void main(String[] args){
            SpringApplication.run(Application.class,args);
        }
    }

消费者  这时候就是要获取实例    得到数据  我这里是使用了Fegin所以需要导入相应jar包

pom.xml文件

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Dalston.RELEASE</spring-cloud.version>
    </properties>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
            <version>1.3.1.RELEASE</version>
        </dependency>
    </dependencies>
    
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>1.5.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

application.yml

eureka: client: serviceUrl: defaultZone: http://192.168.10.109:8761/eureka/
    server: port: 8764
    spring: application: name: service-fegin

application.class类

@SpringBootApplication
    @EnableDiscoveryClient
    @EnableFeignClients
    public class Application {
    
        public static void main(String[] args){
            SpringApplication.run(Application.class,args);
        }
    }

接受实例的接口类  接口的方法要与发布服务的方法一样  由于它是通过URL进行访问所以value值要能访问到发布服务的方法    并且只能是通过GET请求服务

@FeignClient(value="SERVICE")
    public interface CloudService {
    
        //方法名字和value要和发布服务的controller中的一样，并且请求的方式要设置成GET请求
        @RequestMapping(value="/cloud",method= RequestMethod.GET)
        String cloud(@RequestParam("name") String name);
    
    }

消费者的controller类访问

@RestController
    public class ControllerFegin {
        @Autowired
        public CloudService cloudService;
    
        @RequestMapping("/cloud/{name}")
        public String test(@PathVariable("name") String name){
            return cloudService.cloud(name);
        }
    }

访问这个地址http://192.168.10.109:8764/cloud/aaa

就会出现负载均衡的方式来访问   他会通过轮询的方式来访问提供的服务

helloaaa---->1

helloaaa---->2