第一步，修改配置pom.xml文件

<packaging>war</packaging>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>

<!-- 移除嵌入式tomcat插件 -->
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>

<!-- 移除之后会报错，加入下面的依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
   <scope>provided</scope>
</dependency>

<build>
<finalName>wxxm</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
<mainClass>com.sc.wxxm.WxxmApplication</mainClass><!-- 项目运行main方法的全路径 -->
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>

</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>

<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
<compilerArguments>
<extdirs>${project.basedir}/src/main/resources/lib</extdirs><!-- maven无法导入的依赖，我自己建的lib包 -->
</compilerArguments>
</configuration>
</plugin>

</plugins>
<resources>
<resource>
<directory>${basedir}/src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<resource>
<directory>${basedir}/src/main/resources</directory>
<includes>
<include>**/**</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>

第二步，修改启动类，启动类继承SpringBootServletInitializer类，重写configure方法

@SpringBootApplication
@EnableAutoConfiguration

public class WxxmApplication extends SpringBootServletInitializer {

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

public static void main(String[] args) {
SpringApplication.run(WxxmApplication.class, args);
}
}

完成以上配置就可以正常打包发布了