

compile('org.springframework.boot:spring-boot-starter-mustache')src/main/resources/templates : 이 위치에 머스테치 파일을 두면 스프링 부트에서 자동으로 로딩함<!DOCTYPE HTML>
<html>
<head>
    <title>스프링부트 웹서비스</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h1>스프링부트로 시작하는 웹 서비스 Ver.2</h1>
</body>
</html>
@Controller
public class IndexController {
    @GetMapping("/")
    public String index(){
        return "index";
    }
}
//footer.mustache
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<!--index.js 추가-->
<script src="/js/app/index.js"></script>
</body>
</html>
//header.mustache
<!DOCTYPE HTML>
<html>
<head>
    <title>스프링부트 웹서비스</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
</head>
<body>
{{>layout/header}}
<h1>스프링부트로 시작하는 웹 서비스 Ver.2</h1>
<div class="col-md-12">
    <div class="row">
        <div class="col-md-6">
            <a href="/posts/save" role="button" class="btn btn-primary">글 등록</a>
        </div>
    </div>
    <br>
<div>
{{>layout/footer}}
<a>태그를 사용해 글 등록 버튼 생성, 이동할 페이지의 주소 "/posts/save"@RequiredArgsConstructor
@Controller
public class IndexController {
    @GetMapping("/posts/save")
    public String postsSave(){
        return "posts-save";
    }
}
posts/save를 호출하면 posts-save.mustache를 호출하는 메소드{{>layout/header}}
<h1>게시글 등록</h1>
<div class="col-md-12">
    <div class="col-md-4">
        <form>
            <div class="form-group">
                <label for="title">제목</label>
                <input type="text" class="form-control" id="title" placeholder="제목을 입력하세요">
            </div>
            <div class="form-group">
                <label for="author"> 작성자 </label>
                <input type="text" class="form-control" id="author" placeholder="작성자를 입력하세요">
            </div>
            <div class="form-group">
                <label for="content"> 내용 </label>
                <textarea class="form-control" id="content" placeholder="내용을 입력하세요"></textarea>
            </div>
        </form>
        <a href="/" role="button" class="btn btn-secondary">취소</a>
        <button type="button" class="btn btn-primary" id="btn-save">등록</button>
    </div>
</div>
{{>layout/footer}}
src/main/resourcws/static/js/app 폴더 생성, index.js 파일 생성var main = {
    init : function () {
        var _this = this;
        $('#btn-save').on('click', function () {
            _this.save();
        });
    },
    save : function () {
        var data = {
            title: $('#title').val(),
            author: $('#author').val(),
            content: $('#content').val()
        };
        $.ajax({
            type: 'POST',
            url: '/api/v1/posts',
            dataType: 'json',
            contentType:'application/json; charset=utf-8',
            data: JSON.stringify(data)
        }).done(function() {
            alert('글이 등록되었습니다.');
            window.location.href = '/';
        }).fail(function (error) {
            alert(JSON.stringify(error));
        });
    }
};
main.init();
var main = { } 형태로 작성한 이유
<script src="/js/app/index.js"></script>
src/main/resources/static에 위치한 정적파일들은 URL에서 /로 설정됨{{>layout/header}}
<h1>스프링부트로 시작하는 웹 서비스 Ver.2</h1>
<div class="col-md-12">
    <div class="row">
        <div class="col-md-6">
            <a href="/posts/save" role="button" class="btn btn-primary">글 등록</a>
        </div>
    </div>
    <br>
    <!-- 목록 출력 영역 -->
    <table class="table table-horizontal table-bordered">
        <thead class="thead-strong">
        <tr>
            <th>게시글번호</th>
            <th>제목</th>
            <th>작성자</th>
            <th>최종수정일</th>
        </tr>
        </thead>
        <tbody id="tbody">
        {{#posts}}
            <tr>
                <td>{{id}}</td>
                <td>{{title}}</a></td>
                <td>{{author}}</td>
                <td>{{modifiedDate}}</td>
            </tr>
        {{/posts}}
        </tbody>
    </table>
</div>
{{>layout/footer}}
public interface PostsRepository extends JpaRepository<Posts, Long> {
    @Query("SELECT p FROM Posts p ORDER BY p.id DESC")
    List<Posts> findAllDesc();
}
@Transactional(readOnly = true)
public List<PostsListResponseDto> findAllDesc(){
        return postsRepository.findAllDesc().stream()
        .map(PostsListResponseDto::new).collect(Collectors.toList());
}
@Getter
public class PostsListResponseDto {
    private Long id;
    private String title;
    private String author;
    private LocalDateTime modifiedDate;
    public PostsListResponseDto(Posts entity){
        this.id = entity.getId();
        this.title = entity.getTitle();
        this.author = entity.getAuthor();
        this.modifiedDate = entity.getModifiedDate();
    }
}
@GetMapping("/")
    private final PostsService postsService;
    
    public String index(Model model){
        model.addAttribute("posts", postsService.findAllDesc());
        return "index";
}
postsService.findAllDesc()로 가져온 결과를 posts로 index.mustache에 전달함{{>layout/header}}
<h1>게시글 수정</h1>
<div class="col-md-12">
    <div class="col-md-4">
        <form>
            <div class="form-group">
                <label for="title">글 번호</label>
                <input type="text" class="form-control" id="id" value="{{post.id}}" readonly>
            </div>
            <div class="form-group">
                <label for="title">제목</label>
                <input type="text" class="form-control" id="title" value="{{post.title}}">
            </div>
            <div class="form-group">
                <label for="author"> 작성자 </label>
                <input type="text" class="form-control" id="author" value="{{post.author}}" readonly>
            </div>
            <div class="form-group">
                <label for="content"> 내용 </label>
                <textarea class="form-control" id="content">{{post.content}}</textarea>
            </div>
        </form>
        <a href="/" role="button" class="btn btn-secondary">취소</a>
        <button type="button" class="btn btn-primary" id="btn-update">수정 완료</button>
    </div>
</div>
{{>layout/footer}}
var main = {
    init : function () {
        var _this = this;
        
        $('#btn-update').on('click', function () {
            _this.update();
        });  
    },
    
    update : function () {
        var data = {
            title: $('#title').val(),
            content: $('#content').val()
        };
        var id = $('#id').val();
        $.ajax({
            type: 'PUT',
            url: '/api/v1/posts/'+id,
            dataType: 'json',
            contentType:'application/json; charset=utf-8',
            data: JSON.stringify(data)
        }).done(function() {
            alert('글이 수정되었습니다.');
            window.location.href = '/';
        }).fail(function (error) {
            alert(JSON.stringify(error));
        });
    },
};
main.init();
type : 'PUT' : PostApiController에 있는 API에서 이미 @PutMapping으로 선언했기 때문에 PUT을 사용해야함url: '/api/v1/posts/'+id, : 어느 게시글을 수정할지 URL Path로 구분하기 위해 id를 추가함{{#posts}}
    <tr>
      <td>{{id}}</td>
      <td><a href="/posts/update/{{id}}">{{title}}</a></td>
      <td>{{author}}</td>
      <td>{{modifiedDate}}</td>
    </tr>
{{/posts}}
@GetMapping("/posts/update/{id}")
    public String postsUpdate(@PathVariable Long id, Model model){
        PostsResponseDto dto = postsService.findById(id);
        model.addAttribute("post", dto);
        return "posts-update";
}
<button type="button" class="btn btn-danger" id="btn-delete">삭제</button>
var main = {
    init : function () {
        var _this = this;
        $('#btn-delete').on('click', function () {
            _this.delete();
        });
    },
    delete : function () {
        var id = $('#id').val();
        $.ajax({
            type: 'DELETE',
            url: '/api/v1/posts/'+id,
            dataType: 'json',
            contentType:'application/json; charset=utf-8'
        }).done(function() {
            alert('글이 삭제되었습니다.');
            window.location.href = '/';
        }).fail(function (error) {
            alert(JSON.stringify(error));
        });
    }
};
main.init();
@Transactional
    public void delete(Long id){
        Posts posts = postsRepository.findById(id).orElseThrow(() -> new IllegalArgumentException("해당 게시글이 없습니다. id = " + id));
        postsRepository.delete(posts);
    }
@DeleteMapping("/api/v1/posts/{id}")
    public Long delete(@PathVariable Long id){
        postsService.delete(id);
        return id;
}