简单的Spring Boot Webapp不起作用，whitelabel错误页面
[英]Simple spring boot webapp doesnt work, whitelabel error page
问题描述
I try run my simple "hello world" Spring Boot web application, but it doesn't work, I get "Whitelabel error page" all the time. 
我尝试运行我的简单“ hello world” Spring Boot Web应用程序，但是它不起作用，我一直都得到“ Whitelabel错误页面”。
My Controller 我的控制器
package com.packt.webapp.controller;
@Controller
@RequestMapping("/")
public class HomeController {
public String home(Model model){
String welcome = new String("Witam");
model.addAttribute("welcome", welcome);
return "home";
}
}
Application.java 应用程序
package com.packt.webapp.controller;
@Configuration
@EnableAutoConfiguration
@ComponentScan
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
}
home.html home.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<title>Test</title>
<link rel="stylesheet" th:href="@{/css/style.css}" />
</head>
<body>
<h1>Hello</h1>
<span th:text="'Message: ' + ${welcome}"></span>
</body>
</html>
pom.xml pom.xml
<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.packt.webapp</groupId>
<artifactId>basket</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.1.4.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
What am I doing wrong? 我究竟做错了什么？ I tried change my project structure, was playing with dependencies, nothing helps. 我试图更改我的项目结构，正在使用依赖项，没有任何帮助。 Can somebody enlighten me? 有人可以启发我吗？
2 个解决方案
解决方案1
0 已采纳 2017-03-17 18:44:12
Your home() method is most likely not being registered by spring since there is no @RequestMapping() above the method. 您的home（）方法很可能在spring之前没有注册，因为该方法上方没有@RequestMapping（）。
If you want home to be registered to /, you have two options. 如果要将房屋注册到/，则有两个选择。 You can move the @RequestMapping that is currently at the class level to the home method like so... 您可以像这样将当前在类级别的@RequestMapping移动到home方法。
@Controller
public class HomeController {
@RequestMapping("/")
public String home(Model model){
String welcome = new String("Witam");
model.addAttribute("welcome", welcome);
return "home";
}
}
Or you can add an addition annotation above the home() method and leave it empty. 或者，您可以在home（）方法上方添加一个附加注释，并将其留空。
@Controller
@RequestMapping("/")
public class HomeController {
@RequestMapping()
public String home(Model model){
String welcome = new String("Witam");
model.addAttribute("welcome", welcome);
return "home";
}
}
解决方案2
-1 2017-03-17 16:13:04
Based on your comments above, you're accessing the wrong url. 根据上面的评论，您访问的网址错误。 Since you've mapped your controller to / and you only have the 1 method, you should access it like: 由于您已将控制器映射到/并且只有1方法，因此应按以下方式进行访问：
http://localhost:8080/
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