Spring boot 不显示 index.html

Question

I have this in com.tuke.doto.Controllers / RootController.java :

package com.tuke.doto.Controllers;

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

@Controller
public class RootController {

    @RequestMapping("/")
    public String root() {
        return "frontpage";
    }
}

and I have frontpage.html in main/resources/static (I also tried to move it into main/resources/templates

When I do request on localhost:8080 I see this:

HTTP Status [404] – [Not Found]

Type Status Report

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Apache Tomcat/8.5.15

and in my console on jetbrains intellij I see this:

javax.servlet.ServletException: Circular view path [error]: would dispatch back to the current handler URL [/error] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)

I've also included server.error.whitelabel.enabled=false into main/resources/application.properties

Where is the problem? Isn't that the simplest example so why it doesn't work?

EDIT maybe I should install some dependency to make it work... this is how my build.gradle looks right now:

dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    compile('org.springframework.boot:spring-boot-starter-websocket')

    compile("org.springframework.boot:spring-boot-devtools")

    testCompile('org.springframework.boot:spring-boot-starter-test')
}

Answer 1

There are a few assumptions we have to make with this question. Do you mean src /main/templates? We also have to assume you are using Thymeleaf? Is that dependency in your gradle path?

compile 'org.springframework.boot:spring-boot-starter-thymeleaf'

Answer 2

IF you are just using static html, you may not need a template library like thyme leaf. Simple return ModelAndViewObject. Place your html in src/main/resources/static

example

@GetMapping("/")
public ModelAndView index() {
    return new ModelAndView("frontpage.html");
}

Answer 3

Try to adding the following to your configuration class

    @Bean
    public EmbeddedServletContainerFactory factory(){
        TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory();
        factory.setContextPath("/myapp");
        return factory;
    }

and the following to application.config

spring.resources.chain.strategy.fixed.enabled=true
spring.resources.chain.strategy.fixed.paths=/**

put .html file inside src/main/resources/templates

And then try to access localhost:8080/myapp/frontpage

Answer 4

If you are trying to simply run an html file, do ensure that the project structure is the following for a Spring Boot app

After following this structure, you will be able to access index.html via launching localhost:8080

Answer 5

For CRA React, below 2 methods can be used

• Copy contents from CRA build folder to either target/classes/static or target/classes/public

This will automatically map index.html with MVC . You can see this during startup of spring-boot application as Adding welcome page: class path resource [public/index.html] Incase this Method fails, alternatively use below

• create a ModelAndView object as below

@RequestMapping("/")
public ModelAndView frontend(){
  return new ModelAndView("frontend.html")
}