前提条件

         1)   工程已经可以成功打成jar,并且运行

改造步骤

          1) 在pom中增加如下配置 

<packaging>war</packaging>

         2)跟启动类同级增加类

              DemoApplication替换成你的启动类

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

public class ServletInitializer extends SpringBootServletInitializer {

	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		return application.sources(DemoApplication.class);
	}

}