spring - spring @controller vs @RestController 错误 whitelabel 错误

Question

我在 STS IDE 中创建了一个基本的 Spring MVC 项目。当我尝试添加控制器时，我添加注释 @Controller 并运行 spring boot 程序，我收到以下错误：-(Whitelabel Error Page This application has no explicit mapping for /error，因此您将此视为后备。 )，但是当我添加 @RestController 时，该方法返回“hello”字符串。请帮助我解决如何使用 @Controller 修复它，并请让我知道为什么会发生这种情况。

示例代码：

package com.adithya.spring.controllers;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@Controller
public class ApplicationController {

@RequestMapping("/")
public String Hello() {
    return "Hello";

}
}

另外，我的pom.xml文件如下：

<?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.adithya</groupId>
<artifactId>spring</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>MyApplication</name>
<description>Login &amp; Reg</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</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>1.8</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>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

项目目录结构。

标签： springmodel-view-controller