spring cloud sleuth

新建spring boot工程trace-1，添加pom依赖

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
        </dependency>
        <!--<dependency>-->
            <!--<groupId>org.springframework.cloud</groupId>-->
            <!--<artifactId>spring-cloud-sleuth-stream</artifactId>-->
        <!--</dependency>-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</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-web</artifactId>
        </dependency>

Trace1Application

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@EnableDiscoveryClient
@SpringBootApplication
public class Trace1Application {

    public static void main(String[] args) {
        SpringApplication.run(Trace1Application.class, args);
    }

    private final Logger logger= LoggerFactory.getLogger(getClass());
    @Bean
    @LoadBalanced
    RestTemplate restTemplate(){
        return new RestTemplate();
    }
    @RequestMapping(value = "/trace-1",method = RequestMethod.GET)
    public String trace(){
        logger.info("===call trace-1===");
        return restTemplate().getForEntity("http://trace-2/trace-2",String.class).getBody();
    }
}

配置

spring.application.name=trace-1
server.port=9101
eureka.client.service-url.defaultZone=http://localhost:1111/eureka/

再建一个trace-2，依赖同上

Trace2Application

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@EnableDiscoveryClient
@SpringBootApplication
public class Trace2Application {

    public static void main(String[] args) {
        SpringApplication.run(Trace2Application.class, args);
    }

    private final Logger logger= LoggerFactory.getLogger(getClass());

    @RequestMapping(value = "/trace-2",method = RequestMethod.GET)
    public String trace(){
        logger.info("===call trace-2===");
        return "Trace";
    }
}

启动之前的eureka-server，启动trace-1和trace-2

访问：http://localhost:9101/trace-1

在控制台中查看日志

trace-1

trace-2

可以看到trace-1中的TraceId c44f784f0a901bd8 已经被传到trace-2中了，这里就实现了服务的跟踪

这里的第二个值是TraceId，第三个值是SpanId，第四个值表示是否将信息输出到Zipkin等服务中收集

这里需要设置一个收集的频率

spring.sleuth.sampler.percentage=1

默认是0.1，改成1方便测试

将trace-1和trace-2中的pom依赖取消注释

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

在docker中运行Zipkin

docker run -d -p 9411:9411 openzipkin/zipkin

配置中添加Zipkin地址

spring.zipkin.base-url=http://10.202.203.29:9411

运行trace-1,trace-2，打开：http://localhost:9101/trace-1 多刷新几次

可以看到第四个值是true

打开Zipkin地址：http://10.202.203.29:9411/zipkin/  点击查找

查看依赖分析