我们如何将 Spring Cloud Sleuth 与 spring MVC 项目一起使用?

How can we use Spring Cloud Sleuth with spring MVC project?

我正在尝试将 spring 云侦探与 spring web mvc 项目一起使用。我们正在将请求从 spring web mvc 发送到另一个 spring 引导项目。我需要在 UI 中显示 traceID 和 spanId。我们怎样才能做到这一点?

编辑

POM.xml 用于 spring 引导应用程序。我正在使用最新版本的 Spring Boot 并添加了 spring cloud sleuth 的依赖项。

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.test</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>

<properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Hoxton.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-sleuth</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </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>

Web MVC 代码:我正在使用 spring rest 模板并从 spring web mvc 应用程序调用 spring 引导服务。

@Controller
public class HelloController {

    @Autowired
    RestTemplate restTemplate;

    private Logger logger = Logger.getLogger(HelloController.class);

    @GetMapping("/hello")
    public String hello(Model model) {
        logger.info("Hello from controller");
        ResponseEntity<String> entity = restTemplate.getForEntity("http://localhost:8092/test", String.class);
        String response = entity.getBody();
        logger.info("Response from Service: "+ response);
        model.addAttribute("name", "Test");
        return "welcome";
    }
}

为此,您需要注入 Tracer bean,然后如果您调用 tracer.currentSpan().context().traceIdString()tracer.currentSpan().context().spanIdString()