markdown 操作文章

悠悠 2022-07-19 05:22 138阅读 0赞

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# markdown 操作文章 #

[markdown 页面编辑器][markdown] ： [http://blog.csdn.net/qq\_19558705/article/details/51993884][markdown]

[markdown 发表文章][markdown 1]： [http://blog.csdn.net/qq\_19558705/article/details/52121321][markdown 1]

[markdown 分页 排序 搜索文章][markdown _ _]  :  [http://blog.csdn.net/qq\_19558705/article/details/52251519][markdown _ _]  
  
markdown 文字标签：[http://blog.csdn.net/qq\_19558705/article/details/52265947][http_blog.csdn.net_qq_19558705_article_details_52265947]

个人主页：[http://www.itit123.cn/][http_www.itit123.cn] 更多干货等你来拿

今天谈谈文章的编辑，查看，删除。慢慢完善博客系统。

效果图：

![20160810143805217][]

![20160810143926838][]

![20160810143837061][]

![20160810143843795][]

直接上代码：

首页简单修改了博客首页的样式，添加了查看，编辑，删除按钮。

<%@ page contentType="text/html;charset=UTF-8"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <%@ taglib prefix="tags" tagdir="/WEB-INF/tags"%>
    <c:set var="ctx" value="${pageContext.request.contextPath}" />
    <style>
    /* 
    	overflow:hidden;white-space:nowrap;text-overflow:ellipsis; 
    	可以将超出的内容用省略号表示，貌似只能对文本格式有效，html格式有问题，有待解决 !
    */
    #blog-listings{width:94%;border:1px solid #ccc;border-radius:7px;box-shadow:1px 1px 1px #ccc;margin:-10px auto 10px;}
    .blog-content{height:70px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;}
    </style>
    <script type="text/javascript" src="${ctx}/static/markdown/js/markdown.js"></script>
    <script type="text/javascript" src="${ctx}/static/markdown/js/markdown-editor.js"></script>
    
    <section id="blog-listings">
    	<div class="container">
    		<div class="row">
    			<c:forEach items="${blogs}" var="blog">
    			<div class="col-sm-4">
                    <div class="panel panel-success" id="${blog.id}">
                        <div class="panel-heading">
                            <h4 class="blog-title">${blog.title}</h4>
                        </div>
                        <div class="panel-body">
    						<p class="pull-right">${blog.createdDate} ${blog.author}</p>
    						<div class="blog-content">${blog.content}</div>
    						<span class="pull-right">
    							<a href="${ctx}/blog/detail?num=${blog.id}" class="btn btn-success"> 查 看 </a>
    							<a href="${ctx}/blog/edit?num=${blog.id}" class="btn btn-warning"> 编 辑  </a>
    							<button οnclick="deleteBlog('${blog.id}')" class="btn btn-danger"> 删 除  </button>
    						</span>
                        </div>
                    </div>
                </div>
    			<script>
    				// 问题一：不能直接把blog.content作为值传给 markdown2html js对特殊字符敏感
    				// 问题二：markdown2html(text) 内容相同 解决方法是给最后一个class添加
    				$(".blog-content:last").html(markdown2html($(".blog-content:last").text()));
    			</script>
    			</c:forEach>
    		</div>
    	</div>
    </section>
    <script>
    function deleteBlog(blogId){
    	alertify.confirm("确定删除该文章么？",
    		function(){
    			$.ajax({
    				type:"post",
    				url:"${ctx}/blog/delete",
    				data:{"num":blogId},
    				success:function(data){
    					if(data.trim() == "success"){
    						var $blogId = "#"+blogId;
    						$($blogId).remove();
    					}
    				}
    			});
    			alertify.success('OK');
    		},
    	  	function(){
    	    	//alertify.error('Cancel');
    	});
    }
    </script>

查看文章的后台逻辑：

/**
    	 * 查看博客详细内容
    	 * @param blogId
    	 * @param model
    	 * @return
    	 */
    	@RequestMapping(value="detail")
    	public String detail(@RequestParam(value="num") String blogId,Model model){
    		if (null != blogId) {
    			model.addAttribute("blog", blogService.findOne(Blog.class,Long.valueOf(blogId)));
    		}
    		return "blog/detail";
    	}

查看文章前端代码：

编辑文章后台逻辑：

/**
    	 * 跳转编辑博客页面
    	 * 
    	 * @param blogId
    	 * @return
    	 */
    	@RequestMapping(value="edit")
    	public String edit(@RequestParam(value="num",required=false) String blogId,Model model){
    		if (null != blogId || ! StringUtils.isEmpty(blogId)) {
    			model.addAttribute("blog", blogService.findOne(Blog.class,Long.valueOf(blogId)));
    		}
    		return "blog/edit";
    	}

编辑文章前端代码：

<%@ page contentType="text/html;charset=UTF-8"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <%@ taglib prefix="tags" tagdir="/WEB-INF/tags"%>
    <c:set var="ctx" value="${pageContext.request.contextPath}" />
    
    <link rel="stylesheet" type="text/css" href="${ctx}/static/markdown/css/bootstrap.css"/>
    <style>
    #blog-listings{width:94%;border:1px solid #ccc;border-radius:7px;box-shadow:1px 1px 1px #ccc;margin:20px auto 10px;}
    .blogTitle{height:36px !important;}
    </style>
    
    <section id="blog-listings">
    	<div class="container">
    		<div class="row form">
    			<div class="col-sm-8">
    				<form id="blogForm" action="${ctx}/blog/update" method="post">
    					<input type="hidden" value="${blog.id}" name="blogId"/>
    					<input type="text" name="blogTitle" class="blogTitle" autofocus="autofocus" placeholder="请输入标题" 
    					value="<c:if test='${not empty blog}'>${blog.title}</c:if>"><br/><br/>
    					
    					<textarea id="markdown-textarea" rows="12" class="span7" name="blogContent" ><c:if test="${not empty blog}">${blog.content}</c:if></textarea>
    					<br/>
    					<button class="btn btn-success"> 发 表 </button>
    					<button οnclick="history.go(-1)" class="btn btn-link"> 返 回  </button>
    				</form>
    			</div>
    		</div>
    	</div>
    </section>
    <script type="text/javascript" src="${ctx}/static/jquery/jquery-1.9.1.min.js"></script>
    <script type="text/javascript" src="${ctx}/static/bootstrap/js/bootstrap.min.js"></script>
    <script type="text/javascript" src="${ctx}/static/markdown/js/markdown.js"></script>
    <script type="text/javascript" src="${ctx}/static/markdown/js/markdown-editor.js"></script>
    <script type="text/javascript" src="${ctx}/static/markdown/js/custom.js"></script>
    <script type="text/javascript" src="${ctx}/static/jquery-validation/jquery.validate-1.14.0.min.js"></script>
    
    <script>
    $(function(){
    	$('#markdown-textarea').markdown();
    });
    $().ready(function() {  
        $("#blogForm").validate({  
            rules: {  
            	blogTitle: {  
                    required: true,  
                    minlength: 3  
                },  
            	blogContent: "required"  
            },  
            messages: {  
            	blogTitle: "标题不能为空",
                blogContent: "请填写内容" 
            },
            submitHandler:function(form){
                form.submit();
            }
        });  
    }); 
    </script>

保存和发表的逻辑是一样的，就不贴代码了。

删除文章后台逻辑：

/**
    	 * 删除博客
    	 * @param blogId
    	 * @param model
    	 * @return
    	 */
    	@RequestMapping(value="delete", method = RequestMethod.POST)
    	@ResponseBody
    	public String delete(@RequestParam(value="num") String blogId,Model model,
    			RedirectAttributes redirectAttributes){
    		try {
    			blogService.deleteBlogBylogic(Long.valueOf(blogId));
    		} catch (Exception e) {
    			e.printStackTrace();
    			// FIXME 有待完善
    			redirectAttributes.addFlashAttribute("message", "删除失败，请稍后再试！");
    			return "fail";
    		}
    		return "success";
    	}

删除文章js代码：

以上是大体思路。现在我们来细化，对于删除，笔者采用的是逻辑删除。所以要在blog的实体类中添加一个删除标识。同样，查询所有文章的时候也是需要通过该标识来查询。

private Integer isDelete;

BlogDao的代码：

package com.real.blog.repository;
    
    import java.util.List;
    
    import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
    import org.springframework.data.jpa.repository.Query;
    import org.springframework.data.repository.PagingAndSortingRepository;
    
    import com.real.blog.entity.Blog;
    
    public interface BlogDao extends PagingAndSortingRepository<Blog, Long>,
    	JpaSpecificationExecutor<Blog>{
    	
    	List<Blog> findByIsDelete(Integer isDelete);
    	
    	@Query("select b from Blog b where b.isDelete = 0")
    	Blog fetchBlogById(Long id);
    }

BlogService：

// 逻辑删除
    	public void deleteBlogBylogic(Long id){
    		Blog blog = blogDao.findOne(id);
    		try {
    			blog.setIsDelete(1);
    			blogDao.save(blog);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    	
    	// 查询所有isDelete = 0 的集合
    	public List<Blog> fetchBlogs() {
    		return blogDao.findByIsDelete(0);
    	}

第一次按照自己的思路来做，可能在设计上存在很多问题。有什么问题和建议可以指出。谢谢！

[markdown]: http://blog.csdn.net/qq_19558705/article/details/51993884
[markdown 1]: http://blog.csdn.net/qq_19558705/article/details/52121321
[markdown _ _]: http://blog.csdn.net/qq_19558705/article/details/52251519
[http_blog.csdn.net_qq_19558705_article_details_52265947]: http://blog.csdn.net/qq_19558705/article/details/52265947
[http_www.itit123.cn]: http://www.itit123.cn/
[20160810143805217]: /images/20220718/52750213b6964394a2d9098efa2bf7cf.png
[20160810143926838]: /images/20220718/97d07b0d3f3342edb0c33bcbab40721c.png
[20160810143837061]: /images/20220718/f481a4945c7842899adbf2a5b8dfe2b0.png
[20160810143843795]: /images/20220718/2277c3a183b24d29b50996cbc2650a83.png