springboot 4大默认容器、指定运行容器

原创已于 2022-09-14 20:27:11 修改 · 1.8k 阅读

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文章标签：

#spring boot #容器 #tomcat #jetty #websocket

于 2022-09-13 09:27:30 首次发布

该文介绍了Spring Boot中如何自定义Web容器的启动顺序，以及如何将默认的Tomcat容器替换为Undertow、Jetty或Netty。通过排除`spring-boot-starter-tomcat`并引入其他容器的相关依赖，可以改变服务器执行的优先级。顺序为：Tomcat > Jetty > Undertow > Netty。

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总结：假如自定义依赖全部存在，则执行生效顺序依次为

tomcat > jetty > undertow > netty

private static RequestUpgradeStrategy initUpgradeStrategy() {
		String className;
		if (tomcatPresent) {
			className = "TomcatRequestUpgradeStrategy";
		}
		else if (jettyPresent) {
			className = "JettyRequestUpgradeStrategy";
		}
		else if (jetty10Present) {
			className = "Jetty10RequestUpgradeStrategy";
		}
		else if (undertowPresent) {
			className = "UndertowRequestUpgradeStrategy";
		}
		else if (reactorNettyPresent) {
			// As late as possible (Reactor Netty commonly used for WebClient)
			className = "ReactorNettyRequestUpgradeStrategy";
		}
		else {
			throw new IllegalStateException("No suitable default RequestUpgradeStrategy found");
		}

		try {
			className = "org.springframework.web.reactive.socket.server.upgrade." + className;
			Class<?> clazz = ClassUtils.forName(className, HandshakeWebSocketService.class.getClassLoader());
			return (RequestUpgradeStrategy) ReflectionUtils.accessibleConstructor(clazz).newInstance();
		}
		catch (Throwable ex) {
			throw new IllegalStateException(
					"Failed to instantiate RequestUpgradeStrategy: " + className, ex);
		}
	}

tomcat （默认）

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

在这里插入图片描述

将默认容器替换为 undertow 容器

<dependency>
  <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <!-- 默认执行顺序：tomcat > jetty > undertow > netty-->
        <!-- 排除tomcat引入其他容器 -->
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<!-- 替换为 undertow -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-undertow</artifactId>
</dependency>

在这里插入图片描述

将默认容器替换为 jetty 容器

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-web</artifactId>
     <exclusions>
         <!-- 默认执行顺序：tomcat > jetty > undertow > netty-->
         <!-- 排除tomcat引入其他容器 -->
         <exclusion>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-tomcat</artifactId>
         </exclusion>
     </exclusions>
 </dependency>
 <!-- 替换为 jetty -->
 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-jetty</artifactId>
 </dependency>

在这里插入图片描述

将默认容器替换为 netty 容器

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <!-- 默认执行顺序：tomcat > jetty > undertow > netty-->
        <!-- 排除tomcat引入其他容器 -->
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>
 <!-- 替换为 netty -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-reactor-netty</artifactId>
</dependency>

在这里插入图片描述