spring cloud微服务配置log4j2日志组件和zipkin进行服务链路追踪

import org.springframework.cloud.sleuth.zipkin2.ZipkinSpanListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import zipkin2.reporter.AsyncReporter;
import zipkin2.reporter.okhttp3.OkHttpSender;
 
@Configuration
public class LoggingConfiguration {
 
    @Bean
    public ZipkinSpanListener zipkinSpanListener(Environment environment) {
        String zipkinBaseUrl = environment.getProperty("spring.zipkin.base-url");
        if (zipkinBaseUrl != null && !zipkinBaseUrl.isEmpty()) {
            OkHttpSender sender = OkHttpSender.create(zipkinBaseUrl);
            return ZipkinSpanListener.create(AsyncReporter.create(sender));
        }
        return ZipkinSpanListener.NOOP;
    }
}

这个代码示例展示了如何在Spring Cloud微服务中配置Zipkin进行服务链路追踪。首先，它检查是否配置了Zipkin的基础URL，如果配置了，它会创建一个OkHttpSender发送者，并配置一个AsyncReporter作为Span监听器。如果没有配置，它会返回一个NOOP的Span监听器，这样不会有任何追踪操作。