配置springboot项目使用外部tomcat过程解析

<!--使用自带的tomcat-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-tomcat</artifactId>
  <scope>provided</scope>
</dependency>

package com.huang;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
//让该类继承springboot的SpringBootServletInitializer
public class SpringBootStartApplication extends SpringBootServletInitializer {
  @Override
  protected SpringApplicationBuilder configure(SpringApplicationBuilder application){
    //找到原先的启动类
    return application.sources(WebchatApplication.class);
  }
}

#目录如下
src
 |-main
  |-java
    |-com.huang.sockerservice
    |-WebchatApplication.class #原本的启动类
    |-SpringBootStartApplication.class #新的启动类
  |-resources