1、导入相关依赖     （存在jsp页面下载问题，可能是缺少tomcat-embed-jasper的依赖对jsp的支持）

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <dependencies>
    <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency> 
        <!--springboot自带的tomcat并没有携带tomcat-embed-jasper的依赖(对jsp的支持的依赖)-->
    <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>  
    </dependencies>

 2、配置application.properties文件

spring.mvc.view.prefix=/pages
spring.mvc.view.suffix=.jsp

3、controller层及springboot启动类

@Controller
public class IndexController {
   @RequestMapping("/index")
  public ModelAndView index(){
   
    ModelAndView mv=new ModelAndView();
    mv.setViewName("/index");
    return mv;
  }
}

 

@SpringBootApplication

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

 注：如果没有使用springboot自带的tomcat，使用外部tomcat的

添加依赖依赖：

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-tomcat</artifactId>    //spring-boot-starter-tomcat里面有tomcat-embed-jasper依赖
      <scope>provided</scope>
    </dependency>