idea怎么使用外置tomcat配置springboot

•  创建一个maven项目

• 导入springboot依赖，注意底下注释部分

    4.0.0

    com.znsd.springboot
    springboot-jsp
    1.0-SNAPSHOT
    
    
    
    war
    
        org.springframework.boot
        spring-boot-starter-parent
        2.3.12.RELEASE
         
    

    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
        
            org.springframework.boot
            spring-boot-starter-tomcat
            
            provided
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
            
                
                    org.junit.vintage
                    junit-vintage-engine
                
            
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

完成下图操作保存即可

配置tomcat启动项

配置视图解析器

创建一个springboot主程序

@SpringBootApplication
public class SpringBootMain {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootMain.class,args);
    }
}

必须编写一个SpringBootServletInitializer的子类，并调用configure方法里面的固定写法

public class ServletInitializer extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        //传入SpringBoot的主程序，
        return application.sources(SpringBootMain.class);
    }
}

然后启动tomcat，控制台输出了spring就启动成功了