spring-cloud
SpringCloud 教程Finchley版本
服务链路追踪(Spring Cloud Sleuth)(Finchley版本)
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/
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| java -jar zipkin-server-2.10.1-exec.jar
访问 localhost:9411
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构建工程
基本知识讲解完毕，下面我们来实战，本文的案例主要有三个工程组成:一个server-zipkin,它的主要作用使用ZipkinServer 的功能，收集调用数据，并展示；一个service-hi,对外暴露hi接口；一个service-miya,对外暴露miya接口；这两个service可以相互调用；并且只有调用了，server-zipkin才会收集数据的，这就是为什么叫服务追踪了。
创建service-hi
application.properties配制文件
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| server.port=8988
spring.zipkin.base-url=http://localhost:9411
spring.application.name=service-hi
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启动类
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| @SpringBootApplication
@RestController
public class ServiceHiApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceHiApplication.class, args);
}
private static final Logger LOG = Logger.getLogger(ServiceHiApplication.class.getName());
@Autowired
private RestTemplate restTemplate;
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
@RequestMapping("/hi")
public String callHome(){
LOG.log(Level.INFO, "calling trace service-hi ");
return restTemplate.getForObject("http://localhost:8989/miya", String.class);
}
@RequestMapping("/info")
public String info(){
LOG.log(Level.INFO, "calling trace service-hi ");
return "i'm service-hi";
}
@Bean
public Sampler defaultSampler() {
return Sampler.ALWAYS_SAMPLE;
}
}
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创建service-miya
创建过程痛service-hi，引入相同的依赖，配置下spring.zipkin.base-url。
application.properties配制文件
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| server.port=8989
spring.zipkin.base-url=http://localhost:9411
spring.application.name=service-miya
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启动类
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| @SpringBootApplication
@RestController
public class ServiceMiyaApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceMiyaApplication.class, args);
}
private static final Logger LOG = Logger.getLogger(ServiceMiyaApplication.class.getName());
@RequestMapping("/hi")
public String home(){
LOG.log(Level.INFO, "hi is being called");
return "hi i'm miya!";
}
@RequestMapping("/miya")
public String info(){
LOG.log(Level.INFO, "info is being called");
return restTemplate.getForObject("http://localhost:8988/info",String.class);
}
@Autowired
private RestTemplate restTemplate;
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
@Bean
public Sampler defaultSampler() {
return Sampler.ALWAYS_SAMPLE;
}
}
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pom.xml
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| <?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.pflm</groupId>
<artifactId>service-miya</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>service-miya</name>
<description>服务链路追踪演示</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.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.RELEASE</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>
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- 依次启动上面的工程，打开浏览器访问：http://localhost:9411/，会出现以下界面：
- 访问：http://localhost:8989/miya，浏览器出现： i’m service-hi
- 再打开http://localhost:9411/的界面，点击Dependencies,可以发现服务的依赖关系：
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