1.新建项目

利用idea创建一个父项目，三个子项目，其中一个项目为生产者，一个项目为消费者，一个为接口等公共服务项目，生产者和消费者需要有web依赖，可以作为tomcat容器启动。

2.项目依赖

<dependencies>
    <dependency>
      <groupId>org.apache.dubbo</groupId>
      <artifactId>dubbo-spring-boot-starter</artifactId>
      <version>2.7.6</version>
    </dependency>

    <!-- zk的依赖 -->
    <dependency>
      <groupId>org.apache.dubbo</groupId>
      <artifactId>dubbo-dependencies-zookeeper</artifactId>
      <version>2.7.6</version>
      <type>pom</type>
      <exclusions>
        <exclusion>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-log4j12</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-aop</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
    </dependency>

3.在facade项目中新建接口

4.编写生产者

4.1 增加dubbo配置

server.port=8081
dubbo.registry.address=zookeeper://localhost:2181
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880
dubbo.registry.timeout=30000
dubbo.application.name=dubbo-provider-ll

4.2 编写生产者dubbo filter

public class ProviderFilter implements Filter {
  @Override
  public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
    Object threadName= invocation.getAttachment("ThreadName");
    if(null!=threadName){
      Thread thread = Thread.currentThread();
      thread.setName(threadName.toString());
    }
    return invoker.invoke(invocation);
  }
}

注意：此处Filter 是dubbo的filter，不是servlet的filter

这里代码的目的是将从消费端传来的线程名称设置为线程名称

在resources目录下新建META-INF/dubbo/com.alibaba.dubbo.rpc.Filter 文件
即新增目录META-INF/dubbo和文件 com.alibaba.dubbo.rpc.Filter

在文件中增加，等号后面为实现dubbo filter的实现类路径
providerFilter=com.dubbo.spring.provider.filter.ProviderFilter

4.3编写dubbo生产者实现类

@Service(filter = {"providerFilter"})
public class DemoServiceImpl implements IDemoService {
  public Logger LOGGER= LoggerFactory.getLogger(DemoServiceImpl.class);
  @Override
  public String getName() {
    LOGGER.info("provider ThreadName : "+Thread.currentThread().getName());
    return "dubbo-test";
  }
}

5.编写消费者

5.1编写消费者filter

public class DubboFilter implements Filter {
  @Override
  public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
    String name = Thread.currentThread().getName();
    invocation.setAttachment("ThreadName",name);
    return invoker.invoke(invocation);
  }
}

此处是将线程名称放入到attachment中，attachment底层是hashmap，后续使用dubbo请求生产者时，会把attachment给到生产者，故在生产中中可以通过key ThreadName来获取消费者端的线程名称
在resources目录下新建META-INF/dubbo/com.alibaba.dubbo.rpc.Filter 文件
即新增目录META-INF/dubbo和文件 com.alibaba.dubbo.rpc.Filter

在文件中增加，等号后面为实现dubbo filter的实现类路径
consumerFilter=com.dubbo.spring.consumer.filter.DubboFilter

5.2 编写response对象

public class Response implements Serializable {

  private static final long serialVersionUID = -3186818832535757509L;
  private String code;

  private String message;

  private Object result;

  private String index;

  public String getCode() {
    return code;
  }

  public void setCode(String code) {
    this.code = code;
  }

  public String getMessage() {
    return message;
  }

  public void setMessage(String message) {
    this.message = message;
  }

  public Object getResult() {
    return result;
  }

  public void setResult(Object result) {
    this.result = result;
  }

  public String getIndex() {
    return index;
  }

  public void setIndex(String index) {
    this.index = index;
  }
}

此response为web端返回到页面统一对象

5.3 编写aop切面

@Aspect
@Component
public class AopContext {

  @Before("execution(* com.dubbo.spring..*.*(..))")
  public void before(){
    Thread thread = Thread.currentThread();
    thread.setName(UUIDUtil.getUUID());
  }
  @Around("execution(* com.dubbo.spring..*.*(..))")
  public Object around(ProceedingJoinPoint pjp){
    Response response=new Response();
    try {
      Object proceed = pjp.proceed();
      if(proceed instanceof Response){
         response=(Response) proceed;
        response.setIndex(Thread.currentThread().getName());
      }
    } catch (Throwable throwable) {
      throwable.printStackTrace();
    }
    return response;
  }
}

1.before是在请求进入时给线程设置名称，为随机生成的uuid
2.around是环绕通知，在执行完之后，在返回的结果中将线程名称设置进去，便于以后异常追踪

5.4 编写web

@RestController
public class WebController {

  private Logger LOGGER= LoggerFactory.getLogger(WebController.class);

  @Reference(filter = {"consumerFilter"})
  private IDemoService iDemoService;

  @GetMapping("/getName")
  public Response getName(){
    LOGGER.info("consumer ThreadName : "+Thread.currentThread().getName());
    String name = iDemoService.getName();
    Response response=new Response();
    response.setResult(name);
    response.setCode("1001");
    response.setMessage("success");
    return response;
  }
}

请求结果

此处为postman响应的，index 为1ca55cb7a17148879923265b89102ccf

生产者线程名称：

消费者线程名称：

可以看到从web页面到生产者，消费者，都有一个全局唯一id进行贯穿，如果在web页面提示有异常时，可以通过这个uuid进行日志追踪

到此这篇关于springboot整合dubbo设置全局唯一ID进行日志追踪的文章就介绍到这了。