基于 Spring Boot 博客系统开发（六）

本系统是简易的个人博客系统开发，为了更加熟练地掌握 SprIng Boot 框架及相关技术的使用。🌿🌿🌿
基于 Spring Boot 博客系统开发（五）👈👈

文章详情页实现

在Controller类中，编写处理HTTP请求的方法来获取文章详情并返回视图。

HomeController.java

java 复制代码

	@RequestMapping("/article/{id}")
    public String article(@PathVariable Long id,Model model){
        Article article = articleService.getById(id);
        if(article == null){
            return "error/404";
        }
        model.addAttribute("article",article);
        return "client/article";
    }

修改视图中代码。article.html

html 复制代码

<title th:text="${article.title}">函数式接口</title>

html 复制代码

    <article class="main-content post-page">
        <div class="post-header">
            <h1 class="post-title" itemprop="name headline" th:text="${article.title}">函数式接口</h1>
            <div class="post-data">
                <time datetime="2018-12-01" itemprop="datePublished"  >发布于 [[${article.created}]]</time>
            </div>
        </div>
        <br />
        <div id="post-content" class="post-content content" th:utext="${@textUtils.md2Html(article.content)}"></div>
    </article>

渲染后效果

文章评论实现

评论用户登录渲染

用户评论前需要进行登录

html 复制代码

<span th:if="${@loginUtils.isLogin()}" class="response">
     Hello，<a data-no-instant="" th:text="${@loginUtils.getLoginUser().username}">admin</a>
     如果你想 <a href="/logout">注销</a> ?
</span>
<span th:unless="${@loginUtils.isLogin()}" class="response">
        用户想要评论，请先<a href="/login" title="登录" target="_blank" data-no-instant="">登录</a>!
</span>

LoginUtils.java

java 复制代码

@Component
public class LoginUtils {

    @Autowired
    public HttpServletRequest request;

    public boolean isLogin(){
        Object loginUser = request.getSession().getAttribute("loginUser");
        return loginUser!=null;
    }

    public User getLoginUser(){
        Object loginUser = request.getSession().getAttribute("loginUser");
        if(loginUser instanceof User){
            return (User)loginUser;
        }
        return null;
    }
}

用户登录前渲染效果：

用户登录后渲染效果：

评论列表渲染

创建CommentController.java，查询指定文章ID的评论列表并分页，以JSON格式返回。

这里注意要写@ResponseBody

java 复制代码

@Controller
@RequestMapping("/comment")
public class CommentController {

    @Autowired
    private ICommentService commentService;

    @RequestMapping("/list")
    @ResponseBody
    public PageInfo<Comment> list(Long articleId,@RequestParam(defaultValue = "1") Integer pageNum){
        PageHelper.startPage(pageNum,3);
        QueryWrapper<Comment> query = new QueryWrapper<>();
        query.eq("article_id",articleId);
        List<Comment> list = commentService.list(query);
        PageInfo<Comment> page = new PageInfo<>(list);
        return page;
    }
}

前端代码，需要引入JQ。由于之前有统一引入到公共JS里了，所以这里不需要引入。

引入JQ

html 复制代码

<script src="/assets/js/jquery.min.js"></script>

HTML中添加文章ID

html 复制代码

 <form id="comment-form" class="comment-form" role="form" >
       <input type="hidden" name="articleId" id="aid" th:value="${article.id}">
       <textarea name="content" id="textarea" class="form-control" placeholder="以上信息可以为空,评论不能为空哦!" required="required" minlength="5" maxlength="2000"></textarea>
       <button type="button" class="submit" id="misubmit">提交</button>
</form>

编写渲染评论列表的JS脚本。这里没有使用模板技术，采用原生文本拼接。

javascript 复制代码

 <script type="text/javascript">
        function loadComment(pageNum){
            $.ajax({
                type: 'get',
                url: '/comment/list',
                data: {articleId:$("#aid").val(),pageNum:pageNum},
                async: true,
                dataType: 'json',
                success: function (result) {
                    console.log(result)
                    let templates = '';
                    $.each(result.list,function (i,o){
                        // 渲染模板
                       templates += '<li id="li-comment-15" class="comment-body comment-parent comment-odd">\n' +
                            '                                <div id="comment-15">\n' +
                            '                                    <div class="comment-view" οnclick="">\n' +
                            '                                        <div class="comment-header">\n' +
                            '                                            <!--设置人物头像和名称-->\n' +
                            '                                            <img class="avatar" src="/assets/img/avatars.jpg" height="50">\n' +
                            '                                            <a class="comment-author" rel="external nofollow">'+o.author+'</a>\n' +
                            '                                        </div>\n' +
                            '                                        <!-- 评论内容 -->\n' +
                            '                                        <div class="comment-content">\n' +
                            '                                            <span class="comment-author-at"></span>\n' +
                            '                                            <p></p><p>'+o.content+'</p>\n' +
                            '    <p></p>\n' +
                            '                                        </div>\n' +
                            '                                        <!-- 评论日期 -->\n' +
                            '                                        <div class="comment-meta">\n' +
                            '                                            <time class="comment-time">'+o.created+'</time>\n' +
                            '\n' +
                            '                                        </div>\n' +
                            '                                    </div>\n' +
                            '                                </div>\n' +
                            '                            </li>';
                    })
                    $(".comment-list").html(templates);

                    let pageText = '';
                    $.each(result.navigatepageNums,function (i,o){
                        pageText +=
                            '<li class="'+(o==result.pageNum?'current':'')+'">' +
                            '<a>'+o+'</a>' +
                            '</li>';
                    });
                    $(".page-navigator").html(pageText);
                    $(".page-navigator a").click(function (){
                        let pageNum = $(this).text();
                        loadComment(parseInt(pageNum));
                    });
                }
            });
        }
        loadComment(1);
    </script>

渲染效果：

评论提交实现

后端 CommentController 添加评论方法

java 复制代码

@Controller
@RequestMapping("/comment")
@Slf4j
public class CommentController {

    @Autowired
    private ICommentService commentService;

    @RequestMapping("/list")
    @ResponseBody
    public PageInfo<Comment> list(Long articleId,@RequestParam(defaultValue = "1") Integer pageNum){
        PageHelper.startPage(pageNum,3);
        QueryWrapper<Comment> query = new QueryWrapper<>();
        query.eq("article_id",articleId);
        List<Comment> list = commentService.list(query);
        PageInfo<Comment> page = new PageInfo<>(list);
        return page;
    }

    @Autowired
    private LoginUtils loginUtils;

    @PostMapping("/add")
    @ResponseBody
    public AjaxResult add(Comment comment, HttpServletRequest request){
        comment.setCreated(new Date()); //实体created 属性修改成Date类型
        comment.setIp(request.getRemoteAddr());
        User loginUser = loginUtils.getLoginUser();
        if(loginUser == null){
            return new AjaxResult(-1,"请先登录");
        }
        comment.setAuthor(loginUser.getUsername());
        try {
            commentService.save(comment);
            return AjaxResult.success();
        }catch (Exception e){
            log.error(e.getMessage());
        }
       return  AjaxResult.error();
    }

}

创建AjaxResult 用于返回异步状态结果

AjaxResult.java

java 复制代码

@Data
public class AjaxResult {

    private int code = 0;
    private String msg ="操作成功" ;
    private Object data;

    public AjaxResult() {
    }

    public AjaxResult(int code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public AjaxResult(int code, String msg, Object data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }
    public static AjaxResult success(){
        return new AjaxResult();
    }
    public static AjaxResult error(){
        return new AjaxResult(-1,"未知错误");
    }
}

前端提交的HTML

html 复制代码

  <div>
        <form id="comment-form" class="comment-form" role="form"  >
             <input type="hidden" name="articleId" id="aid" th:value="${article.id}">
             <textarea name="content" id="textarea" class="form-control" placeholder="以上信息可以为空,评论不能为空哦!" required="required" minlength="5" maxlength="2000"></textarea>
             <button type="button" class="submit" id="misubmit">提交</button>
        </form>
  </div>

提交评论的JS脚本

javascript 复制代码

 $("#misubmit").click(function (){

                $.ajax({
                    type: 'post',
                    url: '/comment/add',
                    data: {articleId:$("#aid").val(),content:$("#textarea").val()},
                    async: false,
                    dataType: 'json',
                    success: function (result) {
                        if(result.code == 0){
                            alert("评论成功");
                            window.location.reload();
                        }else{
                            alert(result.msg)
                        }
                    }
                });
            });

基于 Spring Boot 博客系统开发（六）