15-SpringBoot自动配置-切换内置web服务器
切换内置web服务器
SpringBoot的Web环境中默认使用tomcat作为内置服务器,其实SpringBoot提供了4种内置服务器供我们选择,我们可以很方便的切换。
演示案例
1.我们首先还是使用上一篇的项目,启动看看 Tomcat 作为内置 web 服务启动
首先要确认一下项目的 pom.xml 是否有 web 启动依赖:
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
2.确认了存在依赖之后,我们在从源码查看内置的web服务器
我们首先打开外部库,依然是找到 autoconfigure 的包:
再找到 web 包,如下:
可以看到内置了几种web服务器。
package org.springframework.boot.autoconfigure.web.embedded;import io.undertow.Undertow;import org.apache.catalina.startup.Tomcat;import org.apache.coyote.UpgradeProtocol;import org.eclipse.jetty.server.Server;import org.eclipse.jetty.util.Loader;import org.eclipse.jetty.webapp.WebAppContext;import org.xnio.SslClientAuthMode;import reactor.netty.http.server.HttpServer;import org.springframework.boot.autoconfigure.EnableAutoConfiguration;import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;import org.springframework.boot.autoconfigure.web.ServerProperties;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.env.Environment; @Configuration@ConditionalOnWebApplication@EnableConfigurationProperties(ServerProperties.class)public class EmbeddedWebServerFactoryCustomizerAutoConfiguration { @Configuration @ConditionalOnClass({ Tomcat.class, UpgradeProtocol.class }) public static class TomcatWebServerFactoryCustomizerConfiguration { @Bean public TomcatWebServerFactoryCustomizer tomcatWebServerFactoryCustomizer(Environment environment, ServerProperties serverProperties) { return new TomcatWebServerFactoryCustomizer(environment, serverProperties); } } @Configuration @ConditionalOnClass({ Server.class, Loader.class, WebAppContext.class }) public static class JettyWebServerFactoryCustomizerConfiguration { @Bean public JettyWebServerFactoryCustomizer jettyWebServerFactoryCustomizer(Environment environment, ServerProperties serverProperties) { return new JettyWebServerFactoryCustomizer(environment, serverProperties); } } @Configuration @ConditionalOnClass({ Undertow.class, SslClientAuthMode.class }) public static class UndertowWebServerFactoryCustomizerConfiguration { @Bean public UndertowWebServerFactoryCustomizer undertowWebServerFactoryCustomizer(Environment environment, ServerProperties serverProperties) { return new UndertowWebServerFactoryCustomizer(environment, serverProperties); } } @Configuration @ConditionalOnClass(HttpServer.class) public static class NettyWebServerFactoryCustomizerConfiguration { @Bean public NettyWebServerFactoryCustomizer nettyWebServerFactoryCustomizer(Environment environment, ServerProperties serverProperties) { return new NettyWebServerFactoryCustomizer(environment, serverProperties); } }}
也就是说,我们只要改变类的依赖,那么就应该可以切换内置的web服务器了。
3.查看 spring-boot-starter-web 启动依赖的内部继承关系
4.排除 tomcat 的依赖
image-20220224213305912
设置了排除之后,我们回头看看 pom.xml 里面的配置如下:
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
<exclusions>
<exclusion>
<artifactId>spring-boot-starter-tomcatartifactId>
<groupId>org.springframework.bootgroupId>
exclusion>
exclusions>
dependency>
可以看到已经排除了依赖。
5.增加 jetty 依赖,使用 jetty 启动web服务
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
<exclusions>
<exclusion>
<artifactId>spring-boot-starter-tomcatartifactId>
<groupId>org.springframework.bootgroupId>
exclusion>
exclusions>
dependency>
<dependency>
<artifactId>spring-boot-starter-jettyartifactId>
<groupId>org.springframework.bootgroupId>
dependency>
Original: https://blog.51cto.com/u_11239407/5435198
Author: 海洋的渔夫
Title: 15-SpringBoot自动配置-切换内置web服务器
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