Run the jar package project as a war package project

1: Modify the pom file

<packaging>war</packaging>

2: Add the following dependencies to the pom file

<!--  war打包配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!--忽略内嵌tomcat，打包部署到tomcat。注*本地运行的时候要把这一段忽略引入个注释掉，要不然项目启动不了-->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        
            <!--  去掉内置的tomcat-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <!--打包的时候可以不用包进去，别的设施会提供。事实上该依赖理论上可以参与编译，测试，运行等周期。
       相当于compile，但是打包阶段做了exclude操作-->
            <scope>provided</scope>
        </dependency>
        
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>

3: Inherit the SpringBootServletInitializer class and implement the configure method

import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

public class SpringBootStartApplication extends SpringBootServletInitializer {
    
    

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    
    
        return application.sources(启动类.class);//启动类--是自己项目的启动类名
    }
}

4: Modify the war package name and replace build

Here, first comment out the jar configuration in the pom file build, and replace the war build configuration

  注释
  <build>
        <resources>
            <resource>
                <directory>${
    
    project.basedir}/lib</directory>
                <targetPath>BOOT-INF/lib/</targetPath>
                <includes>
                    <include>**/*.jar</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
   </build>

添加如下配置
<build>
        <finalName>war-demo</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                    <webResources>
                        <resource>
                            <directory>${
    
    project.basedir}/lib</directory>
                            <targetPath>WEB-INF/lib/</targetPath>
                            <includes>
                                <include>**/*.jar</include>
                            </includes>
                        </resource>
                    </webResources>
                </configuration>
            </plugin>
        </plugins>

    </build>

5: Project packaging

   通过idea的maven打包----执行package（与jar打包一致）

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