如何查看当前SpringBoot使用的何种web服务器呢？

Spring Boot 使用web日志服务器查看方法

方式1:
   查看SpringBoot启动日志
   
方式2:
   mvn dependency:tree
   查看引用的jar类型

方式3：
   检测pom.xml文件

方式4:
   使用Spring Boot Actuator
   
方式5：
   使用编程的方式，查看当前服务器类型

1.查看启动日志

当Spring Boot应用程序启动时
  它会在控制台输出启动日志
   其中包括使用的Web服务器信息

例
- Tomcat: 
  Tomcat started on port(s): 8080 (http) with context path ''
 
-Jetty:
  Jetty started on port(s) 8080 (http/1.1) with context path ''

- Undertow
  Undertow started on port(s) 8080 (http) with context path ''

2.使用`mvn dependency:tree`命令

 
mvn dependency:tree

- Tomcat:
  [INFO]    org.springframework.boot:spring-boot-starter-tomcat:jar:2.7.4:compile
  
- Jetty:
  [INFO]    org.springframework.boot:spring-boot-starter-jetty:jar:2.7.4:compile
   
- Undertow:
  [INFO]    org.springframework.boot:spring-boot-starter-undertow:jar:2.7.4:compile

3.检查`pom.xml`文件

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

- Jetty:
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <exclusions>
          <exclusion>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-tomcat</artifactId>
          </exclusion>
      </exclusions>
  </dependency>
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jetty</artifactId>
  </dependency>

- Undertow:
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <exclusions>
          <exclusion>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-tomcat</artifactId>
          </exclusion>
      </exclusions>
  </dependency>
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-undertow</artifactId>
  </dependency>

4.使用Spring Boot Actuator

项目中集成Spring Boot Actuator
可通过访问`/actuator/info`或`/actuator/env`端点来获取更多信息

访问`/actuator/env`:
  GET http://localhost:8080/actuator/env

5.编程方式检查服务器

import org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext;
import org.springframework.context.ApplicationContext;
import org.springframework.web.server.adapter.WebHttpHandlerBuilder;

import javax.servlet.ServletContext;

public class WebServerChecker {

    public static void main(String[] args) {
        ApplicationContext context = SpringApplication.run(MyApplication.class, args);

        if (context instanceof ServletWebServerApplicationContext) {
            ServletContext servletContext = ((ServletWebServerApplicationContext) context).getServletContext();
            if (servletContext != null) {
                System.out.println("Web Server: " + servletContext.getServerInfo());
            }
        } else {
            WebHttpHandlerBuilder builder = context.getBean(WebHttpHandlerBuilder.class);
            System.out.println("Web Server: " + builder.getWebServerFactory().getClass().getSimpleName());
        }
    }
}