template might not exist or might not be accessible by any of the configured Template Resolvers 完美解决

有了以上这两步就没问题了，如下是项目的目录结构

Spring 启动类及MVC的 控制器部分代码：

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.example.bean.User;



@Controller
@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
        System.out.print("app init");
    }
    
    @RequestMapping("/hello")
    @ResponseBody
    String home() {
        System.out.print("hello");
        return "Hello ,spring boot!";
    }

    @RequestMapping("/")
    public String index() {
        System.out.print("index");
        return "index";
    }
    
    @RequestMapping("/userLogin")
    public String userLogin(Model model) {
        User user = new User("guozhong",30);
        model.addAttribute("user",user);
        return "userLogin";
    }
}

浏览器访问：

template might not exist or might not be accessible by any of the configured Template Resolvers 完美解决

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