一、实例：配置Servlet容器的端口为9000

import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import
org.springframework.boot.web.servlet.server.ConfigurableServletWebServerFactory;
import org.springframework.stereotype.Component;
@Component
public class MyWebServerFactoryCustomizer implements
WebServerFactoryCustomizer<ConfigurableServletWebServerFactory> {
  @Override
  public void customize(ConfigurableServletWebServerFactory server) {
  server.setPort(9000);
  }
}

二、实例：使用ConfigurableServletWebServerFactory的子类（比如TomcatServletWebServerFactory)来配置Servlet容器

import java.time.Duration;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.stereotype.Component;
@Component
public class MyTomcatWebServerFactoryCustomizer implements
WebServerFactoryCustomizer<TomcatServletWebServerFactory> {
  @Override
  public void customize(TomcatServletWebServerFactory server) {
  server.addConnectorCustomizers((connector) ->
connector.setAsyncTimeout(Duration.ofSeconds(20).toMillis()));
  }
}