第九篇：服务链路追踪（Spring Cloud Sleuth）

2024-03-15 23:42:54

1.Spring Cloud Sleuth介绍

微服务架构上通过业务来划分服务的，通过REST调用，对外暴露的一个接口，可能需要很多个服务协同才能完成这个接口功能，如果链路上任何一个服务出现问题或者网络超时，都会形成导致接口调用失败。随着业务的不断扩张，服务之间互相调用会越来越复杂，这就需要链路追踪

2.准备server-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即可启动即可

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

下载java -jar zipkin-server-2.10.1-exec.jar

进入解压后的文件下，进入cmd，输入java -jar zipkin-server-2.12.9-exec.jar，开启服务

打开浏览器，访问http://127.0.0.1:9411/，可以看到

3.构建工程

新建Maven父工程，eureka-server子工程，如第一篇文章

创建eureka-client子工程，pom文件如下

<?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">
    <parent>
        <artifactId>spring-cloud-sleuth</artifactId>
        <groupId>com.niuben</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>eureka-client</artifactId>
    <packaging>jar</packaging>

    <dependencies>
        <!--Eureka Client依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!--Web依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--zipkin-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>
    </dependencies>

    <!--Maven打包插件-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

编写application.yml配置文件

server:
  port: 8988
spring:
  application:
    name: eureka-client
  zipkin:
    base-url: http://localhost:9411
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

启动类加载@EnableEurekaClient，开始Eureka客户端

@SpringBootApplication
@EnableEurekaClient // 开始Eureka客户端
public class EurekaClientApplication {

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

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

    /**
     * Brave是一个用于捕捉和报告分布式操作的延迟信息给Zipkin的工具库
     * Sampler.ALWAYS_SAMPLE返回一个sampler，设置需要采样
     */
    @Bean
    public Sampler defaultSampler() {
        return Sampler.ALWAYS_SAMPLE;
    }

}

创建controller层，TestEurekaClient类

@RestController
public class TestEurekaClient {

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping("/test2")
    public String info(){
        return restTemplate.getForObject("http://localhost:8988/info",String.class);
    }

    @RequestMapping("/hi")
    public String home(){
        return "i am eureka-client-two";
    }

}

@RestController
public class TestEurekaClient {

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping("/test")
    public String callHome() {
        return restTemplate.getForObject("http://localhost:8989/miya", String.class);
    }

    @RequestMapping("/info")
    public String info() {
        return "i am eureka-client";

    }

}

创建eureka-client-two子工程，pom文件如下

<?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">
    <parent>
        <artifactId>spring-cloud-sleuth</artifactId>
        <groupId>com.niuben</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>eureka-client-two</artifactId>
    <packaging>jar</packaging>

    <dependencies>
        <!--Eureka Client依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!--Web依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--zipkin-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>
    </dependencies>

    <!--Maven打包插件-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

编写application.yml配置文件

server:
  port: 8989
spring:
  application:
    name: eureka-client-two
  zipkin:
    base-url: http://localhost:9411
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

启动类加载@EnableEurekaClient，开始Eureka客户端

@SpringBootApplication
@EnableEurekaClient // 开始Eureka客户端
public class EurekaClientTwoApplication {

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

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

    /**
     * Brave是一个用于捕捉和报告分布式操作的延迟信息给Zipkin的工具库
     * Sampler.ALWAYS_SAMPLE返回一个sampler，设置需要采样
     */
    @Bean
    public Sampler defaultSampler() {
        return Sampler.ALWAYS_SAMPLE;
    }

}

依次启动eureka-server，eureka-client，eureka-client-two，打开浏览器访问：http://localhost:9411/，再访问http://localhost:8989/test2

点击依赖查看依赖关系

查找，进入查看具体详情

源码：https://gitee.com/niugit/spring-cloud-sleuth

码农公寓

1.Spring Cloud Sleuth介绍

2.准备server-zipkin

3.构建工程

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