9.SpringCloud-Sleuth

Spring Cloud Sleuth 功能是在分布式系统中提供服务调用追踪。集成Zipkin提供了可视化界面。

1.创建SleuthZipkinServer工程添加依赖

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
   <groupId>io.zipkin.java</groupId>
   <artifactId>zipkin-server</artifactId>
</dependency>

<dependency>
   <groupId>io.zipkin.java</groupId>
   <artifactId>zipkin-autoconfigure-ui</artifactId>
</dependency>

<dependency>
   <groupId>io.zipkin.java</groupId>
   <artifactId>zipkin-ui</artifactId>
   <version>2.4.3</version>
</dependency>

2.修改配置文件

server:
  port: 8020

3.启动类加入注解

@EnableZipkinServer

4.创建2个相互调用的工程
4.1 创建SleuthZipkina工程并添加依赖

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-zipkin</artifactId>
   <version>1.3.1.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-sleuth</artifactId>
   <version>1.3.1.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-sleuth-core</artifactId>
   <version>1.3.1.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-sleuth-zipkin</artifactId>
   <version>1.3.1.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.aspectj</groupId>
   <artifactId>aspectjweaver</artifactId>
   <version>1.8.13</version>
</dependency>

4.2 修改工程a配置文件

server:
  port: 8021
spring:
  zipkin:
    base-url: http://localhost:8020
  application:
    name: service-hi

4.3 工程a启动类

@SpringBootApplication
@RestController
public class SleuthzipkinaApplication {

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

    @Autowired
    private RestTemplate restTemplate;

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

    @RequestMapping("/hi")
    public String callHome() {
        return restTemplate.getForObject("http://localhost:8022/miya", String.class);
    }

    @RequestMapping("/info")
    public String info() {
        return "i'm service-hi";
    }

    @Bean
    public AlwaysSampler defaultSampler(){
        return new AlwaysSampler();
    }

}

4.4 创建SleuthZipkinb工程并添加依赖

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-zipkin</artifactId>
   <version>1.3.1.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-sleuth-zipkin</artifactId>
   <version>1.3.1.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-sleuth</artifactId>
   <version>1.3.1.RELEASE</version>
</dependency>

4.5 修改工程b配置文件

server:
  port: 8022
spring:
  zipkin:
    base-url: http://localhost:8020
  application:
    name: service-miya

4.6 工程b启动类

@SpringBootApplication
@RestController
public class SleuthzipkinbApplication {

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

   @RequestMapping("/hi")
   public String home(){
      return "hi i'm miya!";
   }

   @RequestMapping("/miya")
   public String info(){
      return restTemplate.getForObject("http://localhost:8021/info",String.class);
   }

   @Autowired
   private RestTemplate restTemplate;

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

}

5.按顺序启动三个工程
访问http://localhost:8021/hi/ 页面返回i'm service-hi，表示调用成功
访问http://localhost:8020/

点列表中的请求查看详情

点Service列表显示请求信息

点依赖分析显示如下图