我是习惯了使用tomcat做容器的，虽然Spring Boot中已经内置了容器，但是出于习惯，还是想和原来web项目一样打war包发布。总体来说很容易，从pom中改几个地方就好。（Spring Boot本意不是我这么玩的）

...
<groupId>com.example</groupId>
    <artifactId>demo02</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>demo02</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!-- Add typical dependencies for a web application -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!-- 如果在使用自带tomcat请注释下面，如果使用第三方tomcat不要注释下面 -->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        ...<!--其他依赖-->
    </dependencies>

    <!-- Package as an executable jar or war -->
    <build>
        <plugins>
            <!-- 如果要打成jar包并使用 java -jar **.jar运行，请不要注释spring-boot-maven-plugin -->
            <!--<plugin>-->
                <!--<groupId>org.springframework.boot</groupId>-->
                <!--<artifactId>spring-boot-maven-plugin</artifactId>-->
            <!--</plugin>-->
                        <!-- 传统的war打包 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <configuration>
                    <warName>springboot</warName>
                </configuration>
            </plugin>
        </plugins>
    </build>
...

主要是<packaging>war</packaging>，自带tomcat关掉，build换成war的。
当然Spring Boot的主函数的启动类要这样写：

@ComponentScan
@EnableAutoConfiguration
public class Application  extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(Application.class);
    }

    public Application() {
        super();
    }

    public static void main(String[] args){
        SpringApplication.run(Application.class,args);
        System.out.println("running .........................................");
    }
}

后来偶然发现有些东西都不用去手写，找啊的，人家也有这么玩的，如下图：