SpringBoot-HelloWorld

Question

我想用SpringBoot创建一个简单的hello world应用程序，其中localhost：8080 / welcome.html将向我们显示Hello World。我想我做得很好，但看不到HelloWorld，只有Whitelabel错误页面。这是到我的仓库的链接。如果有人可以检查出什么毛病，我将非常高兴！ https://github.com/BElluu/ElenXHelloPOM.xml<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>com.springbelluu</groupId>    <artifactId>springboot-helloworld</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>jar</packaging>    <name>springboot-helloworld</name>    <description>Demo project for Spring Boot</description>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.1.0.BUILD-SNAPSHOT</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        <java.version>10</java.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.apache.tomcat.embed</groupId>            <artifactId>tomcat-embed-jasper</artifactId>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>jstl</artifactId>        </dependency>    </dependencies>