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Spring Boot 配置 Undertow 容器

配置之前，您需要知道的是，Tomcat, Jetty, Undertow 作为三大主流 Servelt 容器，Undertow 的性能要优于前两者。

所以，我们推荐您使用 Undertow 容器。接下来，就我们看看如何在 Spring Boot 中快捷地集成 Undertow。

一、添加 Maven 依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <!-- 移除掉默认支持的 Tomcat -->
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<!-- 添加 Undertow 容器 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-undertow</artifactId>
</dependency>

二、启动项目

添加完上面的 maven 依赖后，Undertow 容器就已经集成完毕了，接下来，让我们启动项目，看看控制台输出：

Connected to the target VM, address: '127.0.0.1:50915', transport: 'socket'

  .   ____          _            __ _ _
 /\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )___ | '_ | '_| | '_ / _` | \ \ \ \
 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |___, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.2.RELEASE)

2023-10-10 20:29:28.876  INFO 21908 --- [           main] s.e.s.SpringBootUndertowApplication      : Starting SpringBootUndertowApplication on DESKTOP-RL6P6LA with PID 21908 (C:\dev\idea_workspace_personal\spring-boot-tutorial\spring-boot-undertow\target\classes started by allen in C:\dev\idea_workspace_personal\spring-boot-tutorial)
2023-10-10 20:29:28.885  INFO 21908 --- [           main] s.e.s.SpringBootUndertowApplication      : No active profile set, falling back to default profiles: default
2023-10-10 20:29:34.388  WARN 21908 --- [           main] io.undertow.websockets.jsr               : UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used
2023-10-10 20:29:34.478  INFO 21908 --- [           main] io.undertow.servlet                      : Initializing Spring embedded WebApplicationContext
2023-10-10 20:29:34.478  INFO 21908 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 5449 ms
2023-10-10 20:29:35.471  INFO 21908 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2023-10-10 20:29:36.423  INFO 21908 --- [           main] org.xnio                                 : XNIO version 3.3.8.Final
2023-10-10 20:29:36.447  INFO 21908 --- [           main] org.xnio.nio                             : XNIO NIO Implementation Version 3.3.8.Final
2023-10-10 20:29:36.614  INFO 21908 --- [           main] o.s.b.w.e.u.UndertowServletWebServer     : Undertow started on port(s) 8080 (http) with context path ''
2023-10-10 20:29:36.621  INFO 21908 --- [           main] s.e.s.SpringBootUndertowApplication      : Started SpringBootUndertowApplication in 8.912 seconds (JVM running for 10.232)
2023-10-10 20:29:48.534  INFO 21908 --- [  XNIO-1 task-1] io.undertow.servlet                      : Initializing Spring DispatcherServlet 'dispatcherServlet'
2023-10-10 20:29:48.534  INFO 21908 --- [  XNIO-1 task-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2023-10-10 20:29:48.547  INFO 21908 --- [  XNIO-1 task-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 12 ms

启动成功，当您看到 Undertow started on port(s) 8080 (http) with context path '' 的行输出时，说明此时正在使用的是 Undertow 容器，而非 Tomcat !
Spring Boot 配置 Undertow 容器

三、Undertow 相关配置

您可以针对 Undertow 容器做一些特定配置，如日志输出路径，设置工作者线程的个数等参数优化等，如下所示：

# 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.io-threads=
# 指定工作者线程个数，默认为 I/O 线程个数的 8 倍
server.undertow.worker-threads=
# 设置 HTTP POST 内容的最大长度，默认不做限制
server.undertow.max-http-post-size=0