原因是指定源文件夹中的哪个资源要编译进行
<build>
<plugins>
<!-- springboot项目编译打包的插件-->
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
<resources>
<resource>
<!--源文件-->
<directory>src/main/webapp</directory>
<!--指定编译到META-INF/resources-->
<targetPath>META-INF/resources</targetPath>
<!--指定源文件夹中的哪个资源要编译进行-->
<includes>
<!-- <include>*.*</include>-->
<include>**/**</include>
</includes>
</resource>
</resources>
</build>
<!-- JSP相关 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<!-- servlet包 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>${jsp-api.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
