SpringBoot切换Tomcat容器，SpringBoot使用Jetty容器

SpringBoot切换Tomcat容器，

SpringBoot修改为Jetty容器，

SpringBoot使用undertow容器，

SpringBoot使用Jetty容器

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©Copyright 蕃薯耀 2018年3月29日

http://www.cnblogs.com/fanshuyao/

附件&源码下载见：http://fanshuyao.iteye.com/blog/2414809

一、SpringBoot默认的容器为Tomcat，依赖包在spring-boot-starter-web下

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

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

</dependencies>

 

 

二、SpringBoot把容器修改为Jetty

方法很简单，就是在pom.xml文件中，在引用的spring-boot-starter-web排除Tomcat的依赖包，然后再引入Jetty容器的依赖包，如下：

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- Jetty适合长连接应用，就是聊天类的长连接 -->
        <!-- 使用Jetty，需要在spring-boot-starter-web排除spring-boot-starter-tomcat，因为SpringBoot默认使用tomcat -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
</dependencies>

三、SpringBoot把容器修改为undertow

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- undertow不支持jsp -->
        <!-- 使用undertow，需要在spring-boot-starter-web排除spring-boot-starter-tomcat，因为SpringBoot默认使用tomcat -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-undertow</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
</dependencies>

四、为什么可以这样切换呢？

因为SpringBoot在org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration类中已经配置好，根据依赖的Jar包自动切换，代码如下：

/**
     * Nested configuration if Tomcat is being used.
     */
    @Configuration
    @ConditionalOnClass({ Servlet.class, Tomcat.class })
    @ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class, search = SearchStrategy.CURRENT)
    public static class EmbeddedTomcat {

        @Bean
        public TomcatEmbeddedServletContainerFactory tomcatEmbeddedServletContainerFactory() {
            return new TomcatEmbeddedServletContainerFactory();
        }

    }

    /**
     * Nested configuration if Jetty is being used.
     */
    @Configuration
    @ConditionalOnClass({ Servlet.class, Server.class, Loader.class,
            WebAppContext.class })
    @ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class, search = SearchStrategy.CURRENT)
    public static class EmbeddedJetty {

        @Bean
        public JettyEmbeddedServletContainerFactory jettyEmbeddedServletContainerFactory() {
            return new JettyEmbeddedServletContainerFactory();
        }

    }

    /**
     * Nested configuration if Undertow is being used.
     */
    @Configuration
    @ConditionalOnClass({ Servlet.class, Undertow.class, SslClientAuthMode.class })
    @ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class, search = SearchStrategy.CURRENT)
    public static class EmbeddedUndertow {

        @Bean
        public UndertowEmbeddedServletContainerFactory undertowEmbeddedServletContainerFactory() {
            return new UndertowEmbeddedServletContainerFactory();
        }

    }

  

方法上注解根据依赖的容器Jar包判断使用哪个容器：

如：

1、tomcat容器

@ConditionalOnClass({ Servlet.class, Tomcat.class })

表示有使用类Tomcat.class则是tomcat容器

2、Jetty容器

@ConditionalOnClass({ Servlet.class, Server.class, Loader.class,
            WebAppContext.class })

3、undertow容器

@ConditionalOnClass({ Servlet.class, Undertow.class, SslClientAuthMode.class })

（如果你觉得文章对你有帮助，欢迎捐赠，^_^，谢谢！） 

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©Copyright 蕃薯耀 2018年3月29日

http://www.cnblogs.com/fanshuyao/