1、在pom.xml添加如下内容：
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jsp-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<scope>provided</scope>
</dependency>
我的pom.xml之前有这么一段依赖代码，需要注释掉，我试了一下，不注释也不影响（重复引用？）：
<!-- <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency> -->
要注意的是scope需要指定为provided
不添加这些对应的引用会出现各种错误，404找不到文件，或者直接把jsp页面下载等等
2、在springboot的配置文件application.properties添加如下内容：
#spring mvc configuration
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
3、编写测试代码
Test2Controller.java
@Controller
public class Test2Controller { @GetMapping("test20")
public String test20() {
return "test20";
} }
test20.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
test20
</body>
</html>
我的目录结构：