springboot切换使用undertow容器的方式

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-WEB</artifactId>
    <!-- 默认是使用的Tomcat -->
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<!-- undertow容器支持 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-undertow</artifactId>
</dependency>

#undertow容器配置开始
# 是否打开 undertow 日志，默认为 false
server.undertow.accesslog.enabled=false
# 设置访问日志所在目录
server.undertow.accesslog.dir=logs
# 指定工作者线程的 I/0 线程数，默认为 2 或者 CPU 的个数
server.undertow.threads.io=8
# 指定工作者线程个数，默认为 I/O 线程个数的 8 倍
server.undertow.threads.worker=256
# 设置 Http POST 内容的最大长度，默认不做限制
server.undertow.max-http-post-size=4MB
# 以下的配置会影响buffer,这些buffer会用于服务器连接的IO操作,有点类似Netty的池化内存管理；
server.undertow.buffer-size=1024
# 是否分配的直接内存(NIO直接分配的堆外内存)
server.undertow.direct-buffers=true
#undertow容器配置结束

@Component
public class UndertowPoolCustomizer implements WebServerFactoryCustomizer<UndertowServletWebServerFactory> {
    @Override
    public void customize(UndertowServletWebServerFactory factory) {
        factory.aDDDeploymentInfoCustomizers(deploymentInfo -> {
            WebSocketDeploymentInfo webSocketDeploymentInfo = new WebSocketDeploymentInfo();
            webSocketDeploymentInfo.setBuffers(new DefaultByteBufferPool(false, 1024));
            deploymentInfo.addServletContextAttribute("io.undertow.websockets.jsr.WebSocketDeploymentInfo", webSocketDeploymentInfo);
        });
    }
}

<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-core</artifactId>
    <version>2.1.0.Final</version>
</dependency>
<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-servlet</artifactId>
    <version>2.1.0.Final</version>
</dependency>
<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-websockets-jsr</artifactId>
    <version>2.1.0.Final</version>
</dependency>