12.将springboot项目打成war包

1.需要在pom.xml文件中添加如下内容

指定将当前应用打成war包

<!-- 指定将当前应用打成war包 -->
<packaging>war</packaging>

2.指定打包的项目名

<finalName>demo</finalName>

<build>
    <!-- 指定打包的项目名 -->
    <finalName>demo</finalName>
    <plugins>
         <plugin>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
    </plugins>
</build>

3.去除内置tomcat容器，添加servlet-api依赖

<!--使用Spring MVC构建Web（包括RESTful）应用程序的入门者。使用Tomcat作为默认的嵌入式容器  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!-- 去除内置tomcat容器 -->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- 添加servlet-api的依赖,用来打war包 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>

4.改造启动类，继承SpringBootServletInitializer类重写configure方法

@SpringBootApplication
public class Demo2Application extends SpringBootServletInitializer{
    
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(Demo2Application.class);
    }
    public static void main(String[] args) {
        SpringApplication.run(Demo2Application.class);
    }
}