一, 简介

Spring Cloud Sleuth 集成 zipkin 组件

Spring Cloud Sleuth 主要功能就是在分布式系统中提供追踪解决方案，并且兼容支持了 zipkin，你只需要在pom文件中引入相应的依赖即可.

二, 下载 zipkin-server :

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

https://gitee.com/ge.yang/spring-demo/tree/master/Jar

1, 启动 zipkin-service: java -jar zipkin-server-2.11.9-exec.jar

2, 启动成功后访问 zipkin 主页: http://localhost:9411/zipkin/

三, 新建服务 service-b

1, 引入Jar包 pom.xml :

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.gy.cloud</groupId>
        <artifactId>cloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>cloud-b</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>cloud-b</name>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- 服务追踪分析组件 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>
    </dependencies>

</project>

2, 配置参数 application.yml :

server:
  port: 8762

spring:
  # 当前服务名称
  application:
    name: service-b
  # zipkin服务地址
  zipkin:
    base-url: http://localhost:9411

# 服务注册地址
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

3, 编写调用接口,启动类 :

package com.gy.cloud.cloudb;

import brave.sampler.Sampler;
import org.springframework.beans.factory.annotation.Autowired;
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.context.annotation.Bean;
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
@EnableEurekaClient
@SpringBootApplication
public class CloudBApplication {

    public static void main(String[] args) {
        SpringApplication.run(CloudBApplication.class, args);
        System.out.println("=== 服务B启动成功 === ");
    }

    @Value("${server.port}")
    private String port;

    @GetMapping("/hi")
    public String home(String name) {
        name = name == null ? "SERVICE-B" : name;
        return "Hi " + name + " , I am from port: " + port;
    }

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

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/info")
    public String info(){
        System.out.println("=== SERVICE-B/info 调取 SERVICE-C/hi ===");
        return restTemplate.getForObject("http://localhost:8763/hi", String.class);
    }

    // 服务追踪分析取样器
    @Bean
    public Sampler defaultSampler() {
        return Sampler.ALWAYS_SAMPLE;
    }

}

启动 service-b, 访问: http://localhost:8762/info , 系统报错.

四, 新建服务 service-c

service-c 与 service-b 基本相同, 只需稍作修改:

1, 修改配置参数 application.yml :

server:
  port: 8763

spring:
  application:
    name: service-c

2, 修改启动类:

    @GetMapping("/info")
    public String info(){
        System.out.println("=== SERVICE-B/info 调取 SERVICE-C/hi ===");
        return restTemplate.getForObject("http://localhost:8762/hi", String.class);
    }