PostController
@GetMapping("/detail")
public void read(long id, Model model) {
Post post = postService.read(id); // id로 POSTS 테이블에서 포스트를 검색.
model.addAttribute("post", post); // 결과를 model에 저장. -> view로 전달.
}PostService
@Transactional(readOnly = true)
public Post read(long id) {
return postRepository.findById(id).orElseThrow();
}detail.html
<html xmlns:th="http://www.thymeleaf.org"
xmlns:layout="http://www.ultraq.net.nz/thymeleat/layout"
layout:decorate="~{layout/base_layout}">
<main layout:fragment="main">
<div class="my-2 card" style="padding: 0 30px 0 30px;">
<div class="card-body">
<form>
<small class="card-text" th:text="|NO. ${post.id}|"></small>
<h2 class="card-title my-2" th:text="${post.title}"></h2>
<p class="card-text" th:text="|작성자: ${post.author}|"></p>
<hr />
<div class="my-2">
<label class="form-label" for="content">내용</label>
<textarea class="form-control" id="content" th:text="${post.content}" readonly></textarea>
</div>
<hr />
<p class="card-text text-end"
th:text="|작성 시간: ${#temporals.format(post.createdTime, 'yyyy.MM.dd HH:mm:ss')} / 수정 시간: ${#temporals.format(post.modifiedTime, 'yyyy.MM.dd HH:mm:ss')}|"></p>
</form>
<div class="mt-5 d-grid gap-2 d-md-flex justify-content-md-center">
<a class="btn btn-outline-info" th:href="@{/post/modify?id={id} (id=${post.id})}">수정</a>
</div>
</div>
</div>
</main>
.