这篇文章很早就写了，才发现尽然显示不出来。
经过我的调研，结论是不建议使用war包部署，好在是有Workaround ：（
github springboot issues/12455)
Workaround
根据spring 官网描述
Servlet 3.1+ Container
To deploy as a WAR to any Servlet 3.1+ container, you can extend and include AbstractReactiveWebInitializer in the WAR. That class wraps an HttpHandler with ServletHttpHandlerAdapter and registers that as a Servlet.
所以尝试了下： demo project
加载springboot上下文
AbstractReactiveWebInitializer 的onStartup(ServletContext servletContext)是和容器的钩子，我们这里需要重写createApplicationContext来加载springboot的上下文。
public class ReactiveWebInitializer extends AbstractReactiveWebInitializer {
@Override
protected Class<?>[] getConfigClasses() {
return new Class[] { StartBootApplication.class };
}
@Override
protected ApplicationContext createApplicationContext() {
SpringApplication springApplication = new SpringApplication(getConfigClasses());
return springApplication.run();
}
}
POM文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.liuliu.webflux.war</groupId>
<artifactId>webflux-war</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>webflux-war</name>
<description>Demo project for Spring Boot webflux war</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.1.1.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<finalName>webflux-war</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>
测试结果
2021-03-14 21:09:11.565 [reactor-http-nio-2] DEBUG o.s.web.server.adapter.HttpWebHandlerAdapter - [a2c7e670] HTTP GET "/mono"
2021-03-14 21:09:11.567 [reactor-http-nio-2] DEBUG o.s.w.r.r.m.a.RequestMappingHandlerMapping - [a2c7e670] Mapped to public reactor.core.publisher.Mono<java.lang.String> com.liuliu.webflux.learning.demo.HelloController.monoHandle()
2021-03-14 21:09:11.568 [reactor-http-nio-2] INFO com.liuliu.webflux.learning.demo.HelloController - mono-start:75c66ab5-3908-4e75-852b-2d7ae72def1e
2021-03-14 21:09:11.569 [reactor-http-nio-2] INFO com.liuliu.webflux.learning.demo.HelloController - mono-end:75c66ab5-3908-4e75-852b-2d7ae72def1e
2021-03-14 21:09:11.569 [reactor-http-nio-2] DEBUG o.s.w.r.r.m.annotation.ResponseBodyResultHandler - Using 'text/html' given [text/html, application/xhtml+xml, image/avif, image/webp, image/apng, application/xml;q=0.9, application/signed-exchange;v=b3;q=0.9, */*;q=0.8] and supported [text/plain;charset=UTF-8, text/event-stream, text/plain;charset=UTF-8, */*]
2021-03-14 21:09:11.569 [reactor-http-nio-2] DEBUG o.s.w.r.r.m.annotation.ResponseBodyResultHandler - [a2c7e670] 0..1 [java.lang.String]
2021-03-14 21:09:21.572 [reactor-http-nio-2] DEBUG org.springframework.core.codec.CharSequenceEncoder - [a2c7e670] Writing "mono handle:75c66ab5-3908-4e75-852b-2d7ae72def1e"
2021-03-14 21:09:21.573 [reactor-http-nio-2] DEBUG reactor.netty.channel.ChannelOperationsHandler - [id: 0xa2c7e670, L:/[0:0:0:0:0:0:0:1]:8081 - R:/[0:0:0:0:0:0:0:1]:63993] Writing object DefaultHttpResponse(decodeResult: success, version: HTTP/1.1)
HTTP/1.1 200 OK
Content-Type: text/html;charset=UTF-8
Content-Length: 48
2021-03-14 21:09:21.581 [reactor-http-nio-2] DEBUG reactor.netty.channel.ChannelOperationsHandler - [id: 0xa2c7e670, L:/[0:0:0:0:0:0:0:1]:8081 - R:/[0:0:0:0:0:0:0:1]:63993] Writing object
2021-03-14 21:09:21.583 [reactor-http-nio-2] DEBUG o.s.web.server.adapter.HttpWebHandlerAdapter - [a2c7e670] Completed 200 OK
2021-03-14 21:09:21.585 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [id: 0xa2c7e670, L:/[0:0:0:0:0:0:0:1]:8081 - R:/[0:0:0:0:0:0:0:1]:63993] Last HTTP response frame
2021-03-14 21:09:21.586 [reactor-http-nio-2] DEBUG reactor.netty.channel.ChannelOperationsHandler - [id: 0xa2c7e670, L:/[0:0:0:0:0:0:0:1]:8081 - R:/[0:0:0:0:0:0:0:1]:63993] Writing object EmptyLastHttpContent
2021-03-14 21:09:21.588 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [id: 0xa2c7e670, L:/[0:0:0:0:0:0:0:1]:8081 - R:/[0:0:0:0:0:0:0:1]:63993] Decreasing pending responses, now 0
2021-03-14 21:09:21.588 [reactor-http-nio-2] DEBUG reactor.netty.channel.ChannelOperationsHandler - [id: 0xa2c7e670, L:/[0:0:0:0:0:0:0:1]:8081 - R:/[0:0:0:0:0:0:0:1]:63993] No ChannelOperation attached. Dropping: EmptyLastHttpContent
测试可用
