启动main类继承SpringBootServletInitializer，并重写“protected SpringApplicationBuilder configure(SpringApplicationBuilder builder)” 方法即可，

修改pom.xml，把<packaging>jar</packaging>修改为<packaging>war</packaging>

有如下依赖包：

<dependency>
　　<groupId>org.springframework.boot</groupId>
　　<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
　　<groupId>org.springframework.boot</groupId>
　　<artifactId>spring-boot-starter-tomcat</artifactId>
　　<scope>provided</scope>
</dependency>