Spring Cloud学习笔记---Spring Cloud Sleuth--新建两个互相调用的服务测试zipkin

之前已经介绍了如何手动搭建一个zipkin，但是那个是很久之前的东西了，没啥技术含量还浪费时间，所以今天就来一个有意思的，好玩的，其实这个也没啥技术含量。２３３３３３
https://zipkin.io/pages/quickstart.html
这个是zipkin的官网，我们可以进行下载它的jar包，直接运行。

启动成功后，zipkin默认是在9411端口的，访问
http://localhost:9411/zipkin/
就可以看到zipkin的追踪界面

接下来，我们写两个互相调用的小的demo。
首先是我们的serviceThree.
其整个demo的目录结构如下

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"><modelVersion>4.0.0</modelVersion><groupId>com.example</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>serviceThree</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.4.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><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>Finchley.SR1</spring-cloud.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-zipkin</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></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

然后就是application.yml

spring:application:name: serviceThreezipkin:base-url: http://localhost:9411#eureka:
#  client:
#    serviceUrl:
#      defaultZone: http://localhost:9999/eureka/server:port: 7779

注释掉注册中心的原因是，zipkin进行服务追踪的时候并不需要注册中心。

为了方便我就直接在入口函数写了

package com.example.demo;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.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;@RestController
@SpringBootApplication
public class ServiceThreeApplication {public static void main(String[] args) {SpringApplication.run(ServiceThreeApplication.class, args);}@Autowiredprivate RestTemplate restTemplate;@Beanpublic RestTemplate getRestTemplate(){return new RestTemplate();}@RequestMapping("/getInfo")public String info(){return "I'm serviceThree";}@RequestMapping("/callServiceFour")public String callServiceTwo(){return restTemplate.getForObject("http://localhost:7780/getInfo",String.class)+"form serviceThree";}@Beanpublic Sampler defaultSampler() {return Sampler.ALWAYS_SAMPLE;}}

接下来就是serviceFour，这次为了稍微规范一点，改了一下目录结构，这个无所谓的。

然后是pom文件，

<?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><groupId>com.example</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>serviceFour</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.4.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><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>Finchley.SR1</spring-cloud.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-zipkin</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></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

然后就是配置文件

spring.application.name=serviceFour
spring.zipkin.base-url=http://localhost:9411
server.port=7780
#eureka.client.service-url.defaultZone=http://localhost:9999/eureka/

之后就是写的测试调用

package com.example.demo.controller;import brave.sampler.Sampler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;/*** Created by chenzhen on 2018/8/7.*/
@RestController
public class xxxController {private Logger logger = LoggerFactory.getLogger(xxxController.class);@AutowiredRestTemplate restTemplate;@Beanpublic RestTemplate getRestTemplate(){return new RestTemplate();}@RequestMapping("/getInfo")public String getInfo(){return "I'm serviceFour";}@RequestMapping("/callServiceThree")public String callServiceThree(){return restTemplate.getForObject("http://localhost:7779/getInfo",String.class)+" form serviceFour";}@Beanpublic Sampler defaultSampler() {return Sampler.ALWAYS_SAMPLE;}
}

两个都写完之后，访问
http://localhost:7780/callServiceThree
http://localhost:7779/callServiceFour
之后再打开zipkin的追踪页面就会发现
http://localhost:9411/zipkin/dependency/

至此，整个小demo的服务依赖关系已经追踪完毕。

但是就目前来看，用zipkin来进行服务链路追踪，对代码有入侵，比如
代码中加的如下的代码就很重要。

@Beanpublic Sampler defaultSampler() {return Sampler.ALWAYS_SAMPLE;}

还有就是配置文件中需要配置zipkin的url,

spring.zipkin.base-url=http://localhost:9411

以及在pom中要引入zipkin依赖

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-zipkin</artifactId></dependency>

以上三者缺一不可。

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