查看内置web容器

spring-boot-autoconfigure-2.3.2.RELEASE.jar 里找到下面的embedded包，可以看到以下4种容器：Jetty，Netty，Tomcat，Undertow

切换至Tomcat容器

1.首先引入pom依赖

我们可以从依赖项中看到SpringBooot依赖了tomcat容器，所以启动web时就是启动的tomcat

 <!--引入springboot父依赖-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
    </parent>

    <dependencies>
        <!--引入启动器依赖 里面就有默认的tomcat -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

2.启动类测试

结果: 可以看到Tomcat started on port(s): 8080，说明现在用的内置容器就是tomcat

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SwitchBuiltInServersApplication {
    public static void main(String[] args) {
        SpringApplication.run(SwitchBuiltInServersApplication.class,args);
    }
}

---

切换至Jetty容器

1.首先引入pom依赖

注意：Maven配置阿里云的settings，如果本地没有Jetty的jar包，Maven会自动去阿里云仓库拉取相关jar包

因为web里引入的是tomcat容器，所以这里首先排除tomcat容器，然后引入Jetty容器

    <!--引入springboot父依赖-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
    </parent>

    <dependencies>
        <!--引入启动器依赖 里面就有默认的tomcat -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!--排除tomcat-->
            <exclusions>
                <exclusion>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--引入Jetty-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
    </dependencies>

2.启动类测试

结果: 可以看到Jetty started on port(s) 8080，说明现在用的内置容器就是Jetty

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SwitchBuiltInServersApplication {
    public static void main(String[] args) {
        SpringApplication.run(SwitchBuiltInServersApplication.class,args);
    }
}

---

切换至Netty容器

1.首先引入pom依赖

注意：Maven配置阿里云的settings，如果本地没有Netty的jar包，Maven会自动去阿里云仓库拉取相关jar包

因为web里引入的是tomcat容器，所以这里首先排除tomcat容器，然后引入Netty容器

    <!--引入springboot父依赖-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
    </parent>

    <dependencies>
        <!--引入启动器依赖 里面就有默认的tomcat -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!--排除tomcat-->
            <exclusions>
                <exclusion>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--引入Netty-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
    </dependencies>

2.启动类测试

结果: 可以看到Netty started on port(s): 8080，说明现在用的内置容器就是Netty

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SwitchBuiltInServersApplication {
    public static void main(String[] args) {
        SpringApplication.run(SwitchBuiltInServersApplication.class,args);
    }
}

---

切换至Undertow容器

1.首先引入pom依赖

注意：Maven配置阿里云的settings，如果本地没有Netty的jar包，Maven会自动去阿里云仓库拉取相关jar包

因为web里引入的是tomcat容器，所以这里首先排除tomcat容器，然后引入Undertow容器

<!--引入springboot父依赖-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
    </parent>

    <dependencies>
        <!--引入启动器依赖 里面就有默认的tomcat -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!--排除tomcat-->
            <exclusions>
                <exclusion>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--引入Undertow-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-undertow</artifactId>
        </dependency>
    </dependencies>

2.启动类测试

结果: 可以看到Undertowstarted on port(s): 8080，说明现在用的内置容器就是Undertow

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SwitchBuiltInServersApplication {
    public static void main(String[] args) {
        SpringApplication.run(SwitchBuiltInServersApplication.class,args);
    }
}

链接：SpringBoot内置web容器切换 源代码下载地址