一、改造 POM.xml 文件

1、 pom.xml 文件中 packaging 结点值修改为 war

如果没有 <packaging> 节点，自己添加

<packaging>war</packaging>

2、排除 SpringBoot 内嵌的 tomcat

dependencies下找到 spring-boot-starter-web 这个依赖，添加 exclusions

<!-- 多模块排除内置tomcat -->
    <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>

3、添加 servlet-api 依赖, 打war包要用到

<!-- servlet-api 依赖, 打war包要用到 -->
     <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>javax.servlet-api</artifactId>
         <scope>provided</scope>
     </dependency>

4、 build 下添加 finalName

<finalName> 等于application.yml 中的 context-path

<build>
        <finalName>jerrydemo</finalName>
    </build>

5、改造前后差异对比

在这里插入图片描述

二、改造启动类

继承 SpringBootServletInitializer 重写 SpringApplicationBuilder

改造前

package com.jerry.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication{ 
    public static void main(String[] args) { 
        SpringApplication.run(DemoApplication.class, args);
    }
}

改造后

package com.jerry.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer { 
    public static void main(String[] args) { 
        SpringApplication.run(DemoApplication.class, args);
    }
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) { 
        return builder.sources(DemoApplication.class);
    }
}