２.RailsをSpringBootに移行する

２．５ コントローラの作成

①パッケージ・エクスプローラーから、右クリックで新規>クラスを選択し、WebNoteController.javaを作成し 以下のコードを入力します

WebNoteController.java

package com.example.demo;

import java.security.Principal;
import java.util.Date;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class WebNoteController {
    @Autowired
    WebnoteRepository repos;
    
    @GetMapping("/")
    public ModelAndView index(
            @ModelAttribute("formModel") Webnote webnote,
            ModelAndView mav) {
        mav.setViewName("index");
        Iterable list = repos.findAll();
        mav.addObject("data", list);
        return mav;
    }

    @GetMapping("/new")
    ModelAndView add() {
        ModelAndView mav = new ModelAndView();
        Webnote webnote = new Webnote();
        mav.addObject("webnote", webnote);
        mav.setViewName("new");
        return mav;
    }

    @GetMapping("/edit")
    ModelAndView edit(@RequestParam int id) {
        ModelAndView mav = new ModelAndView();
        Webnote webnote = repos.findById(id);
        mav.addObject("webnote", webnote);
        mav.setViewName("new");
        return mav;
    }

    @GetMapping("/show")
    ModelAndView show(@RequestParam int id) {
        ModelAndView mav = new ModelAndView();
        Webnote webnote = repos.findById(id);
        mav.addObject("webnote", webnote);

        mav.setViewName("show");
        return mav;
    }
    
    @PostMapping("/create")
    @Transactional(readOnly=false)
    public ModelAndView save(
        @ModelAttribute("webnote") @Validated Webnote webnote,
            BindingResult result,
            Principal principal) {

        webnote.setCreatedAt(new Date());
        webnote.setUpdatedAt(new Date());
        repos.saveAndFlush(webnote);
        return new ModelAndView("redirect:index");
    }

    @PostMapping("/delete")
    @Transactional(readOnly=false)
    public ModelAndView delete(@RequestParam int id) {
        repos.deleteById(id);
        return new ModelAndView("redirect:index");
    }
}