spring boot 項目打war包

springboot 項目若是要打成war包，部署到tomcat，並非把pom中jar改爲war就能夠，還須要其餘幾個額外步驟

1  把pom中打包類型改成war

<packaging>war</packaging>

2 在springboot starterweb依賴中剔除 tomcat

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <!-- 去除內嵌tomcat -->
    <exclusions>
    <exclusion>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
    </exclusion>
    </exclusions>
</dependency>

3 ，添加servlet依賴

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
</dependency>

4 啓動類繼承springBootServletInitializer 並重寫方法。war包配置完成 

public class CsrfdemoApplication  extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(CsrfdemoApplication.class, args);
    }
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(this.getClass());
    }
}