一篇博客带你实现一个真正的项目!

 先来看看它是什么样式的:

目录:

1、大体步骤🦖

        1、创建Maven项目🦕

        2、引入依赖🦕

        3、创建必要的目录🦕

        4、编写代码🦕

        5、打包部署(基于SmartTomcat)🦕

        6、在浏览器验证🦕

 2、具体代码实现🦖

        1、V——用户界面,前端部分🦕

        HTML 部分🤯

        CSS 部分🤯

        JS 部分🤯: 


1、大体步骤:

        要想自己实现一个Web项目,具体步骤如下:

        1、创建Maven项目

        打开 Idea,创建 new project,在新弹窗的左侧选项中,选择 Maven,点击 next; 

        在新弹窗里写好项目的名称和路径,然后点击 finish,就完成项目创建了。

        2、引入依赖

        现在我们进入了代码编辑界面,开始项目的第二步:引入必需的依赖,包括 servlet、mysql、jackson。 

        先找到自动跳转出来的 pom.xml 文件,文件位置如下:

        在这里填上一段 <dependencies> </dependencies> 标签,之后我们引入的依赖代码就会放在这个标签内部。

        打开Maven中央仓库网站:https://mvnrepository.com/  

        在最上方搜索 servlet ,点击第一个搜索结果 Java Servlet API,再在下方的版本号里选择 3.1.0 版本,最后复制下面那串代码到之前的 pom.xml 文件的 dependencies 标签中:

        mysql 和 jackson 也是一样,先在搜索框搜索 mysql ,点击第一个搜索结果,再找到 5.1.47 版本的,点击之后还是复制那串代码到 dependencies 标签下:

        在搜索框搜索 jackson ,点击第一个搜索结果,再点击 2.12.6.1 版本,最后复制代码:

 

         最后引入成功后,就会开始下载依赖,如果你的idea没有显示下载,那么可以自己手动点击刷新下载。

        3、创建必要的目录

        当我们成功引入依赖后,就可以开始创建必需的目录:
        1)在 main 目录下创建一个 webapp 目录


        2)在 webapp 目录下创建一个 WEB-INF 目录;注意字母为全大写!

 

         3)在 WEB-INF 目录下创建一个文件,命名为 web.xml :

         4)最后把下面这串代码复制到 web.xml 文件里:

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>Archetype Created Web Application</display-name>
</web-app>

        4、编写代码

        这里的内容是之后我们需要花大时间编写的代码,这里只是先演示一下看看我们之前的步骤有没有成功,例如我们先写一个 servlet :

        1)在 main 目录的 java 目录里创建一个类,命名为 HelloServlet:


        2)在 HelloServlet 里填入以下代码:

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("hello servlet");
    }
}

        5、打包部署(基于SmartTomcat)

        这里的打包部署我们使用 smart Tomcat 来合并完成;smart Tomcat 是一个 idea 的插件,所以如果你是第一次使用,需要先下载下来。

        1)点击左上角的 File > Settings···

         2)点击左侧选项的 Plugins > Markplace > 在搜索框搜索 smart tomcat > 点击 Installed 

> apply > OK 结束!

        3)安装好了以后就可以导入这个插件了!先点击 idea 右侧的 Add Configuration···

        4) 在新弹出的弹窗里点击左上角的 + 号,再找到我们下载好的 smart Tomcat ,点击OK:

         5)在这个smart tomcat 设置界面,需要设置的有三个,name 可以随意设置,自己顺眼就行;Tomcat Server 刚开始是没有的,需要选择自己安装 tomcat 的路径的文件夹;第三个 Context Path 很重要,设置后一定得记住,当然记不住也没关系,之后可以再打开这个界面看看。

         6)设置完之后,界面右上角就会变为下面这样,点击右边的那个绿的小三角就可以启动 tomcat 服务器了,点击后会出现一大堆红色代码,不懂担心,就这样的:

        6、在浏览器验证

        当我们成功启动服务器后,就可以在浏览器里验证以下,看看我们之前所做的准备有没有错误或Bug:

        1)在浏览器输入这串地址:127.0.0.1:8080/blog_system/hello ,注意,第一个斜杠和第二个斜杠之间的是我们之前在smart tomcat 里设置的 context path ,第二个斜杠后面的是 HelloServlet上面设置的 servlet path ,当页面出现 “hello servlet” 时,就说明前置准备已经完毕了:

 2、具体代码实现:

        这个项目我们使用前后端分离的方式,使用MVC模式,所以我们在代码实现时也分为M、V、C这三部分。

        1、V——用户界面,前端部分:

        前端部分主要分为三个板块:html、css 和 javascript 。

        HTML 部分:

        在真正写代码之前呢,我们需要在 webapp 目录下创建一个 image 文件夹,里面存放三张图片,可以是 jpg 格式,也可以是png 格式, 第一张图片命名为“系统头像”,这个是在系统导航栏最左侧显示的一个小头像;第二张命名为“用户头像”,这个是登录进页面显示的当前用户头像;第三张命名为“背景”,这个图片是你的博客系统的整个背景图片。上面三张你都可以选择你喜欢的,就像我下面那张图片一样。

        1)博客列表页:

        在 webapp 下创建一个新的文件,命名为 blog_list.html ,并输入以下代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>博客列表</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/blog_list.css">
</head>
<body>
    <!-- 这里是导航栏 -->
    <div class="nav">
        <img src="image/小猪头像.png" alt="">
        <span>我的博客系统</span>
        <!-- 空白元素,用来占位置! -->
        <div class="spacer"></div>
        <a href="blog_list.html">主页</a>
        <a href="blog_edit.html">写博客</a>
        <a href="logout">退出</a>
    </div>

    <!-- 这里的contaier作为页面的版心: -->
    <div class="container">
        <!-- 左侧个人信息: -->
        <div class="left">
            <div class="card">
                <img src="image/张卫健.png" alt="">
                <h3></h3>
                <a href="#">github 地址</a>
                <div class="counter">
                    <span>文章</span>
                    <span>分类</span>
                </div>
                <div class="counter">
                    <span>2</span>
                    <span>1</span>
                </div>
            </div>
        </div>
        <!-- 右侧内容信息: -->
        <div class="right">
            <!-- 每一个 .blog都对应着一个博客: -->
            <!-- <div class="blog">
                <div class="title">
                    我的第一篇博客:
                </div>
                <div class="date">
                    2022.05.06
                </div>
                <div class="desc">
                    从今天起,我要认真敲代码!Lorem, ipsum dolor sit amet consectetur adipisicing elit. Vel provident delectus odit exercitationem quis pariatur quia sapiente soluta assumenda consequuntur laboriosam officia repudiandae, placeat quasi, dolores harum eaque nemo officiis.
                </div>
                <a href="./blog_detail.html">
                    点击查看全文 &gt;&gt;
                </a>
            </div> -->
        </div>
    </div>

    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
    <script>
        // 在页面加载的时候,通过ajax给服务器发送数据,获取到博客列表信息,并显示在界面上
        function getBloglist(){
            $.ajax({
                type:'get',
                url:'blog',
                success:function(body){
                    // 获取到的body内容就是一个js对象数组,每个元素就是一个js对象
                    // 1、先把 .right 里原有的数据清空
                    let rightDiv = document.querySelector('.right');
                    rightDiv.innerHTML = '';
                    // 2、遍历body,构造出一个个blogDiv
                    for(let blog of body){
                        let blogDiv = document.createElement('div');
                        blogDiv.className = 'blog';
                        // 构造标题的div:
                        let titleDiv = document.createElement('div');
                        titleDiv.className = 'title';
                        titleDiv.innerHTML = blog.title;
                        blogDiv.appendChild(titleDiv);
                        // 构造发布时间的div:
                        let dateDiv = document.createElement('div');
                        dateDiv.className = 'date';
                        dateDiv.innerHTML = blog.postTime;
                        blogDiv.appendChild(dateDiv);
                        // 构造博客摘要的div:
                        let descDiv = document.createElement('div');
                        descDiv.className = 'desc';
                        descDiv.innerHTML = blog.content;
                        blogDiv.appendChild(descDiv);
                        // 构造查看全文:
                        let a = document.createElement('a');
                        a.innerHTML = '点击查看全文>>';
                        // 此处希望点击之后能够跳转到博客详情页,跳转过程需要告知服务器要访问的是哪个博客的详情页:
                        a.href = 'blog_detail.html?blogId=' + blog.blogId;
                        blogDiv.appendChild(a);

                        // 最后把blogDiv挂到dom树上:
                        rightDiv.appendChild(blogDiv);
                    }
                },
                error:function(){
                    alert('获取博客列表失败!');
                }
            });
        }

        getBloglist();
        
    </script>

    <!-- 在这里引入common.js文件,就可以执行到里面的代码,也就进行了登录状态的检测了 -->
    <script src="js/common.js"></script>

    <script>
        getUserInfo('blog_list.html');
    </script>
</body>
</html>

        2)博客详情页:

        在 webapp 目录下创建一个文件,命名为 blog_detail.html :

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>博客详情页</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/blog-detail.css">

    <!-- 引入 editor.md 的依赖: -->
    <link rel="stylesheet" href="editor.md/css/editormd.min.css" />
    <script src="js/jquery.min.js"></script>
    <script src="editor.md/lib/marked.min.js"></script>
    <script src="editor.md/lib/prettify.min.js"></script>
    <script src="editor.md/editormd.js"></script>
</head>
<body>
    <!-- 这里是导航栏 -->
    <div class="nav">
        <img src="image/小猪头像.png" alt="">
        <span>我的博客系统</span>
        <!-- 空白元素,用来占位置! -->
        <div class="spacer"></div>
        <a href="blog_list.html">主页</a>
        <a href="blog_edit.html">写博客</a>
        <a href="logout">退出</a>
    </div>

    <!-- 这里的contaier作为页面的版心: -->
    <div class="container">
        <!-- 左侧个人信息: -->
        <div class="left">
            <div class="card">
                <img src="image/张卫健.png" alt="">
                <h3>夏开开</h3>
                <a href="#">github 地址</a>
                <div class="counter">
                    <span>文章</span>
                    <span>分类</span>
                </div>
                <div class="counter">
                    <span>2</span>
                    <span>1</span>
                </div>
            </div>
        </div>
        <!-- 右侧内容信息: -->
        <div class="right">
            <!-- 使用这个div来包裹住整个博客的内容详情 -->
            <div class="blog-content">
                <!-- 博客标题 -->
                <h3></h3>
                <!-- 博客的时间 -->
                <div class="date"></div>
                <!-- 正文 -->
                <div id="content" style="opacity: 80%">
                </div>
            </div>
        </div>
    </div>


    <script>
        function getBlogDetail(){
            $.ajax({
                type:'get',
                // location.search 拿到了形如“?vlogId=5” 这样的内容
                url:'blog' + location.search,
                success: function(body){
                    // 根据body里的内容来构造html页面:

                    // 1、先构造博客的标题:
                    let h3 = document.querySelector(".blog-content>h3");
                    h3.innerHTML = body.title;
                    // 2、构造博客发布时间:
                    let dateDiv = document.querySelector(".date");
                    dateDiv.innerHTML = body.postTime;
                    // 3、构造博客正文内容:

                    // 如果直接把content设为innerHTML,此时展示在页面上的是原始的markdown字符串
                    // 咱们需要的是渲染后,带格式的效果,所以不用下面方法,
                    // let content = document.querySelector("#content");
                    // content.innerHTML = body.content;

                    // 第一个参数对应id=content的html标签,渲染后得到的html片段就会被放到这个标签下
                    editormd.markdownToHTML('content',{
                        markdown: body.content
                    });
                }
            });
        }

        getBlogDetail();

        

        //加上一个逻辑,通过GET /login 这个接口来获取当前的登陆状态:
        function getUserInfo(pageName){
            $.ajax({
                type: 'get',
                url: 'login',
                success: function(body){
                // 判定此处的body是不是一个有效的user对象(userId 是否为非0)
                if(body.userId && body.userId > 0){
                    // 此时登陆成功,不做处理
                    console.log('当前登陆成功!用户名:'+body.username);

                    // // 根据当前用户登录的情况,把用户名设置到html页面上:
                    // if(pageName == 'blog_list.html'){
                    // changeUserName(body.username);
                    // }

                    // 在getUserInfo 的回调函数中,来调用获取作者信息
                    getAuthorInfo(body);
                }else{
                    // 登录失败:
                    // 让前端页面跳转到login.html
                    alert('当前尚未登录,请登录后再访问!')
                    location.assign('blog_login.html');
                }
                },
                error: function(){
                    alert('当前尚未登录,请登录后再访问!')
                    location.assign('blog_login.html');
                }
            });
        }
    
        // 判定用户的登录状态:
        getUserInfo('blog_detail.html');
        
        // 从服务器获取一下当前博客的作者信息,并显示在界面上
        // 这里的参数user就是刚才从服务器拿到的当前登录用户信息
        function getAuthorInfo(user){
            $.ajax({
                type: 'get',
                url: 'authorInfo'+location.search,
                success: function(body){
                    // 此处的body,就是服务器返回的User对象,是文章的作者信息
                    if(body.username){
                        // 若响应中的username存在,就把这个值设置到页面上:
                        changeUserName(body.username);

                        if(body.username == user.username){
                            // 若作者和当前登录用户是同一个人,则显示“删除按钮”
                            let navDiv = document.querySelector('.nav');
                            let a = document.createElement('a');
                            a.innerHTML = '删除';
                            // 此时点击删除时,期望构造一个形如:blogDelete?blogId=6 这样的请求
                            a.href = 'blogDelete'+location.search;
                            navDiv.appendChild(a);
                        }
                    }else{
                        console.log('获取作者信息失败!' + body.season);
                    }
                }
            });
        }

        function changeUserName(username){
            let h3 = document.querySelector('.card>h3');
            h3.innerHTML = username;
        }
    </script>
</body>
</html>

        3)博客编辑页:

        在编写博客编辑页之前需要导入editor.md 这个 api ,这个可以自己自行下载,也可以在文章最后进入我的码云下载,里面也有整套代码。

        在 webapp 目录下创建一个文件,命名为 blog_edit.html :

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>博客编辑页</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/blog_edit.css">

    <!-- 引入 editor.md 的依赖 -->
    <link rel="stylesheet" href="editor.md/css/editormd.min.css" />
    <script src="js/jquery.min.js"></script>
    <script src="editor.md/lib/marked.min.js"></script>
    <script src="editor.md/lib/prettify.min.js"></script>
    <script src="editor.md/editormd.js"></script>
</head>
<body>
    <!-- 这里是导航栏 -->
    <div class="nav">
        <img src="image/小猪头像.png" alt="">
        <span>我的博客系统</span>
        <!-- 空白元素,用来占位置! -->
        <div class="spacer"></div>
        <a href="blog_list.html">主页</a>
        <a href="blog_edit.html">写博客</a>
        <a href="logout">退出</a>
    </div>
    
    <!-- 包含整个博客编辑页内容的编辑器: -->
    <div class="blog-edit-container">
        <form action="blog" method="post" style="height: 100%">
            <div class="title">
                <input type="text" placeholder="在此处输入标题" name="title" id="title">
                <!-- <button>发布文章</button> -->
                <input type="submit" value="发布文章" id="submit">
            </div>
            <!-- 放置 md 编辑器: -->
            <div id="editor">
                <!-- 为了进行form的提交,此处加一个textarea多行编辑器,借助这个编辑框来实现表单提交 -->
                <textarea name="content" style="display: none"></textarea>
            </div>
        </form>
    </div>

    <script>
        // 初始化编辑器:
        let editor = editormd("editor", {
            // 这里的尺寸必须在这里设置. 设置样式会被 editormd 自动覆盖掉. 
            width: "100%",
            // 设定编辑器高度
            height: "calc(100% - 50px)",
            // 编辑器中的初始内容
            markdown: "# 在这里写下一篇博客",
            // 指定 editor.md 依赖的插件路径
            path: "editor.md/lib/",
            // 此处要加上一个重要的选项,然后editor.md会自动把内容同步在这里:
            saveHTMLToTextarea: true
        });
    </script>
</body>
</html>

        4)博客登录页:

        在 webapp 目录下创建一个文件,命名为 blog_login.html :

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登陆页面</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/blog-login.css">
</head>
<body>
    <!-- 这里是导航栏 -->
    <div class="nav">
        <img src="image/小猪头像.png" alt="">
        <span>我的博客系统</span>
        <!-- 空白元素,用来占位置! -->
        <div class="spacer"></div>
        <a href="blog_list.html">主页</a>
        <a href="blog_edit.html">写博客</a>
        <!-- 注销按钮没必要在登录页面展示: -->
        <!-- <a href="#">注销</a> -->
    </div>

    <div class="login-container">
        <!-- 设置登录界面的登录框: -->
        <form action="login" method="post">
            <div class="login-dialog">
                <h3>登录</h3>
                <div class="row">
                    <span>用户名:</span>
                    <input type="text" id="username" name="username">
                </div>
                <div class="row">
                    <span>密码:</span>
                    <input type="password" id="password" name="password">
                </div>
                <div class="row">
                    <!-- <button>提交</button> -->
                    <input type="submit" id="submit" value="提交">
                </div>
            </div>
        </form>
    </div>
</body>
</html>

        CSS 部分:

        这部分代码可以直接在webapp 目录里写,也可以先创建一个 css 目录,在这个目录里写,我选择的是在创建一个 css 目录:

        1)博客通用样式:

        创建一个文件,命名为 common.css :

/* 放置一些页面都会用到的样式 */

/* 此操作取消浏览器的默认样式: */
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 给整个页面添加背景: */
html,body{
    height: 100%;
}

body{
    /* 这里路径:因为common是在css目录里,而css和image是同级的,所以需要.. */
    background-image: url(../image/粉红猪猪背景.jpeg);
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
}

/* 设置导航栏样式: */
.nav{
    /* 设置宽度: */
    width: 100%;
     /* 设置高度: */
    height: 50px;
    /* r-红色;g-绿色;b-蓝色;a-透明度 */
    background-color: rgba(51, 51, 51, 0.5);
    /* 文字颜色: */
    color: white;
    /* 导航栏内部的内容都是一行排列,所以使用弹性布局 flex */
    display: flex;
    /* 设置子元素垂直居中: */
    align-items: center;
}

/* 设置导航栏里的图片样式: */
.nav img{
    width: 40px;
    height: 40px;
    /* 设置圆角弧度,当为50%时,是圆形: */
    border-radius: 50%;
    /* 设置图片与左侧的外边距: */
    margin-left: 30px;
    /* 设置图片与右侧的外边距: */
    margin-right: 10px;
}
/* 设置那个空白元素: */
.nav .spacer{
    /* 相对于父元素,宽度设为父元素的70%: */
    width: 78%;
}

/* 设置导航栏的a标签样式: */
.nav a{
    color: white;
    /* 取消下划线: */
    text-decoration: none;
    /* 设置a标签之间的内边距:0 为上下边距;10px为左右边距: */
    padding: 0 10px;
}


/* 以下为版心相关样式: */
.container{
    /* 设置版心宽度: */
    width: 1000px;
    /* 设置版心高度,为浏览器页面高度减去导航栏高度(使用calc()函数): */
    height: calc(100% - 50px);

    /* 将版心设为水平居中: */
    margin: 0 auto;

    /* 设置弹性布局,因为left 和right 都是块级元素,默认占一行 */
    display: flex;
    /* 设置container里的两个元素为左右分开 */
    justify-content: space-between;
}
/* 设置left个人信息的样式: */
.container .left{
    height: 100%;
    width: 200px;
}
/* 设置right内容信息的样式: */
.container .right{
    height: 100%;
    width: 790px;

    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 10px;

    /* 将页面设置为上下延申 */
    overflow: auto;
}

/* 下面设置card部分样式: */
.card{
    /* 设置背景颜色: */
    background-color: rgba(255, 255, 255, 0.8);
    /* 设置圆角弧度: */
    border-radius: 10px;
    /* 通过设置内边距,达到使头像居中效果: */
    padding: 30px;
}
/* 设置card里的图片: */
.card img{
    width: 140px;
    height: 140px;
    /* 将其设为圆形: */
    border-radius: 50%;
}
/* 设置h3标签: */
.card h3{
    text-align: center;
    padding: 10px;
}
/* 设置card里的a标签: */
.card a{
    /* 将a标签转换为块级元素,因为很多行内元素边距不生效: */
    display: block;
    text-align: center;
    text-decoration: none;
    color: grey;
    padding: 10px;
}
/* 设置“文章,分类”标签: */
.card .counter{
    display: flex;
    justify-content: space-around;
    padding: 5px;
}

        2)博客列表页样式:

        创建一个文件,命名为 blog_list.css :

/* 这里专门写和博客列表页相关样式: */

.blog{
    width: 100%;
    padding: 20px;
}
/* 设置博客标题: */
.blog .title{
    /* 设置标题水平居中: */
    text-align: center;
    /* 设置标题字体大小: */
    font-size: 22px;
    /* 设置字体是否加粗: */
    font-weight: bold;
    padding: 10px;
}
/* 设置博客日期: */
.blog .date{
    text-align: center;
    color: rgb(189, 8, 77);
    /* 设置内边距,上下10px,左右0: */
    padding: 10px 0;
}

.blog .desc{
    /* 设置首行缩进2字符: */
    text-indent: 2em;
}
/* 设置 查看全文 按钮: */
.blog a{
    /* 设为块级元素,方便设置尺寸: */
    display: block;
    width: 140px;
    height: 40px;
    /* 将该元素设为水平居中: */
    margin: 13px auto;
    /* 设置边框: */
    border: 2px rgb(238, 87, 87) solid;
    border-radius: 20px;

    /* 设置字体颜色: */
    color: rgb(238, 87, 87);
    /* 设置字体垂直居中: */
    line-height: 40px;
    /* 设置字体水平居中: */
    text-align: center;
    /* 取消下划线: */
    text-decoration: none;

    /* 如果想让变化有一个渐变,可以加上过渡效果: */
    transition: all 1s;
}
/* 设置将鼠标放在a标签上时,出现的样式: */
.blog a:hover{
    background-color: tomato;
    color: white;
}

        3)博客详情页样式:

        创建一个文件,命名为 blog_detail.css :

/* 给博客详情页使用的样式文件: */


.blog-content{
    padding: 30px;
}
/* 设置博客标题: */
.blog-content h3{
    /* 设置文本居中对齐: */
    text-align: center;
}
/* 设置博客时间: */
.blog-content .date{
    text-align: center;
    color: rgb(189, 8, 77);
    /* 设置边距:上下20px,左右0; */
    padding: 20px 0;
}

.blog-content p{
    /* 首行缩进2字符: */
    text-indent: 2em;
    padding: 10px 0;
}

        4)博客编辑页样式:

        创建一个文件,命名为 blog_edit.css :

/* 这是博客编辑页专用的样式文件: */

.blog-edit-container{
    width: 1000px;
    height: calc(100% - 50px);
    /* 设置该元素为水平居中 */
    margin: 0 auto;
}

.blog-edit-container .title{
    width: 100%;
    height: 50px;

    display: flex;
    align-items: center;
    justify-content: space-between;
}

.blog-edit-container .title #title{
    width: 900px;
    height: 40px;

    border-radius: 10px;
    border: none;
    outline: none;

    font-size: 22px;
    line-height: 40px;
    padding-left: 10px;

    background-color: rgba(255, 255, 255, 0.8);
}

.blog-edit-container .title #submit{
    width: 95px;
    height: 40px;
    
    color: white;
    background-color: rgb(231, 76, 89);

    border-radius: 10px;
    border: none;
    outline: none;
}
/* 设置“发布文章”按钮的点击效果: */
.blog-edit-container .title #submit:active{
    background-color: rgb(201, 11, 4);
}

#editor{
    border-radius: 10px;
    /* opacity 也是设置元素背景颜色的透明度
    但是background-color只是针对当前元素进行设置,不会影响到子元素
    而 opacity会影响到子元素,具备“继承性”,即:
    给最外面元素设置了透明度,里面的元素也会一起变透明~
     */
    opacity: 90%;
}

        5)博客登录页样式:

        创建一个文件,命名为 blog_login.css :

/* 登陆页面的专用样式文件 */

.login-container{
    width: 100%;
    height: calc(100% - 50px);

    /* 需要让里面的登录框垂直水平居中: */
    display: flex;
    /* 垂直居中 */
    align-items: center;
    /* 水平居中 */
    justify-content: center;
}
/* 设置登录框: */
.login-dialog{
    width: 400px;
    height: 350px;

    background-color: rgba(255, 255, 255, 0.9);
    /* 设置矩形的圆角弧度: */
    border-radius: 10px;
}
/* 设置登录框里的“登录”标题: */
.login-dialog h3{
    text-align: center;
    padding: 50px;
}
/* 设置“row”行: */
.login-dialog .row{
    width: 100%;
    height: 50px;

    display: flex;
    align-items: center;
    justify-content: center;
}

.login-dialog .row span{
    /* 将其设为块级元素,方便设置尺寸: */
    display: block;
    width: 100px;
    font-weight: 700;
}

/* 设置两个输入框: */
#username,#password{
    width: 200px;
    height: 40px;
    /* 设置输入框里的文字大小: */
    font-size: 22px;
    /* 使输入款里的文字垂直居中: */
    line-height: 40px;
    /* 让文字与左边有10px的距离: */
    padding-left: 10px;

    border-radius: 10px;
    /* 消除边框: */
    /* border: none; */
    /* 消除轮廓线: */
    outline: none;
}
/* 设置提交按钮的样式: */
.row #submit{
    width: 300px;
    height: 50px;
    /* 与上面元素的边距: */
    margin-top: 45px;

    border-radius: 10px;
    border: none;
    outline: none;

    color: white;
    background-color: rgb(212, 53, 67);

    font-size: 15px;
}
/* 设置提交按钮点击时的样式: */
.row #submit:active{
    background-color: rgb(184, 45, 10);
}

        JS 部分: 

        js 部分也是一样,可以选择创建一个子目录,也可以不创建直接生产文件,这里我们只需要创建两个文件,

        1)创建一个文件,命名为 common.js :

// 这里放置一些检测登录状态的公共代码:

//加上一个逻辑,通过GET /login 这个接口来获取当前的登陆状态:
function getUserInfo(pageName){
    $.ajax({
        type: 'get',
        url: 'login',
        success: function(body){
            // 判定此处的body是不是一个有效的user对象(userId 是否为非0)
            if(body.userId && body.userId > 0){
                // 此时登陆成功,不做处理
                console.log('当前登陆成功!用户名:'+body.username);

                // 根据当前用户登录的情况,把用户名设置到html页面上:
                if(pageName == 'blog_list.html'){
                   changeUserName(body.username);
                }
            }else{
                // 登录失败:
                // 让前端页面跳转到login.html
                alert('当前尚未登录,请登录后再访问!')
                location.assign('blog_login.html');
            }
        },
        error: function(){
            alert('当前尚未登录,请登录后再访问!')
            location.assign('blog_login.html');
        }
    });
}

function changeUserName(username){
    let h3 = document.querySelector('.card>h3');
    h3.innerHTML = username;
}

        2)创建一个文件,命名为 jquery.min.js :

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        这一篇博客先写到这里,因为实在太长了,可以点进我的主页,还有第二篇哦!

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