Spring Cloud Sleuth (zipkin组件)(Finchley版本)

1.构建服务zipkin

在spring Cloud为F版本的时候，已经不需要自己构建Zipkin Server了，只需要下载jar即可，下载地址：

https://dl.bintray.com/openzipkin/maven/io/zipkin/java/zipkin-server/

下载并启动该服务。

登陆：http://localhost:9411 可以查看

2.eurka-server服务先启动，服务的注册中心

3.实现服务a

*********服务 eureka-service-a**********

pom.xml

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.0.5.RELEASE
         
    
    com.cxb
    springcloud
    0.0.1-SNAPSHOT
    eureka-service-a
    Demo project for Spring Boot

    
        1.8
        Finchley.RELEASE
    

    
        
            
                org.springframework.cloud
                spring-cloud-dependencies
                ${spring-cloud.version}
                pom
                import
            
        
    

    
        
            org.springframework.boot
            spring-boot-starter
        

        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
        

        
            org.springframework.cloud
            spring-cloud-starter-zipkin
        

        
            org.springframework.cloud
            spring-cloud-starter-netflix-ribbon
        

    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

application.yml 注意这里的zipkin的服务中心是http://localhost:9411 而不是http://localhost:9411/zipkin/ 被这个坑了好一会.

server:
  port: 8770

spring:
  application:
    name: eureka-service-a
  zipkin:
    base-url: http://localhost:9411

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

IndexController

package com.cxb.springcloud.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;


@RestController
public class IndexController {

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/getInfo")
    public String get() {
        return "service a";
    }

    @RequestMapping("/call")
    public String callService(){
        return restTemplate.getForObject("http://EUREKA-SERVICE-B/getInfo", String.class);
    }
}

启动类EurekaServiceAApplication，注意这里的@EnableDiscoveryClient注解要加上，不然后面报错No instances available for EUREKA-SERVICE-B，被这个也坑了好一会0.0

package com.cxb.springcloud;

import brave.sampler.Sampler;
import org.springframework.beans.factory.annotation.Autowired;
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.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class EurekaServiceAApplication {

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

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }

    @Bean
    public Sampler defaultSampler() {
        return Sampler.ALWAYS_SAMPLE;
    }
}

启动服务a。

4.实现服务b,跟服务a基本一样

*********服务 eureka-service-b**********

pom.xml

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.0.5.RELEASE
         
    
    com.cxb
    springcloud
    0.0.1-SNAPSHOT
    eureka-service-b
    Demo project for Spring Boot

    
        1.8
        Finchley.RELEASE
    

    
        
            
                org.springframework.cloud
                spring-cloud-dependencies
                ${spring-cloud.version}
                pom
                import
            
        
    

    
        
            org.springframework.boot
            spring-boot-starter
        

        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
            
                
                    org.junit.vintage
                    junit-vintage-engine
                
            
        

        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
        

        
            org.springframework.cloud
            spring-cloud-starter-zipkin
        

        
            org.springframework.cloud
            spring-cloud-starter-netflix-ribbon
        

    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

application.yml

server:
  port: 8771

spring:
  application:
    name: eureka-service-b
  zipkin:
    base-url: http://localhost:9411

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

IndexController

package com.cxb.springcloud.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.logging.Level;

@RestController
public class IndexController {

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/getInfo")
    public String get() {
        return "service b";
    }

    @RequestMapping("/call")
    public String callService(){
        return restTemplate.getForObject("http://EUREKA-SERVICE-A/getInfo",String.class);
    }
}

EurekaServiceBApplication启动类

package com.cxb.springcloud;

import brave.sampler.Sampler;
import org.springframework.beans.factory.annotation.Autowired;
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.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class EurekaServiceBApplication {

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

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }

    @Bean
    public Sampler defaultSampler() {
        return Sampler.ALWAYS_SAMPLE;
    }
}

启动服务b。

最后测试：服务注册成功。

http://desktop-u2hs0mo:8771/call 调用服务a的接口成功。

http://desktop-u2hs0mo:8770/call  调用服务b的接口成功。

最后去http://localhost:9411/zipkin/中心查看服务之间的关系以及调用情况等。

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