解决Springboot部署到webapps下访问404

首先，启动类需要重写：

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(ApplicationRun.class);
}
pom.xml需要添加：

<packaging>war</packaging>

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