MTGClone/src/main/java/MTGClone/controller/HelloController.java

package MTGClone.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class HelloController {
    @GetMapping({"/", "/hello"})
    public String hello(Model model, @RequestParam(value="name", required=false, defaultValue="World") String name) {
        model.addAttribute("name", name);
        return "hello";
    }

    @PostMapping({"/greet"})
    public String greet(@RequestParam("name") String name, ModelMap modelMap) {
        modelMap.put("name", name);
        return "hello";
    }
}