1. 项目设计

前端使用 HTML+CSS+JavaScript+JQuery
后端使用 Spring MVC+Spring Boot+MyBatis

2. 效果展示

3. 创建项目并配置文件

1.1 创建 Spring 项目

1.2 配置文件

application.properties 配置内容

spring.profiles.active=dev

application-dev.properties 配置内容

spring.datasource.url=jdbc:mysql://localhost:3306/MyBlogSystem" />create database if not exists MyBlogSystem;use MyBlogSystem;drop table if exists blog;-- 创建一个博客表create table blog (blogId int primary key auto_increment,title varchar(1024),content mediumtext,postTime datetime,userId int);drop table if exists user;-- 创建一个用户信息表create table user (userId int primary key auto_increment,username varchar(128) unique,password varchar(128));

4.2 使用 MyBatis 操作数据库

在 resources 下创建一个 mapper 包. 包下创建 UserMapper.xml 和
BlogMapper.xml

• BlogMapper.xml 里是对博客表的数据库操作
• UserMapper.xml 里是对用户表的数据库操作

UserMapper.xml

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.example.demo.mapper.UserMapper"><insert id="addUser" keyProperty="userId" keyColumn="userId">insert into user(username password) values (#{username}, #{password})</insert><select id="selectByName" resultType="com.example.demo.model.User">select * from user where username = #{username}</select><select id="selectById" resultType="com.example.demo.model.User">select * from user where userId = #{userId}</select></mapper>

BlogMapper.xml

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.example.demo.mapper.BlogMapper"><select id="getAllBlog" resultType="com.example.demo.model.Blog">select * from blog</select><select id="getBlogByBid" resultType="com.example.demo.model.Blog">select * from blog where blogId = #{blogId}</select><insert id="postBlog" keyColumn="userId" keyProperty="userId">insert into blog(title,content,postTime,userId) values(#{title},#{content},#{postTime},#{userId})</insert><delete id="deleteBlog">delete from blog where blogId = #{blogId}</delete><update id="updateBlog">update blog set content = #{content},title = #{title} where blogId = #{blogId}</update><select id="getAllBlogById" resultType="com.example.demo.model.Blog">select * from blog where userId = #{userId}</select></mapper>

User 实体类 和 Blog 实体类

在 model 包下 创建 User 类 和 Blog 类

User 类

@Datapublic class User {public int userId;public String username;public String password;}

Blog 类

@Datapublic class Blog {public int blogId;public String title;public String content;public Timestamp postTime;public int userId;}

UserMapper 接口 和 BlogMapper 接口

在 mapper 包下创建 UserMapper 和 BlogMapper 接口

UserMapper

@Mapperpublic interface UserMapper {void addUser(User user);User selectByName(String username);User selectById(Integer userId);}

BlogMapper

@Mapperpublic interface BlogMapper {List<Blog> getAllBlog();Blog getBlogByBid(Integer blogId);void postBlog(Blog blog);void deleteBlog(Integer blogId);void updateBlog(Blog blog);List<Blog> getAllBlogById();}

UserService 类 和 BlogService 类

service 包下创建 UserService类 和 BlogService类
UserService

@Servicepublic class UserService {@Resourceprivate UserMapper userMapper;public void addUser(User user){userMapper.addUser(user);}public User selectByName(String username){return userMapper.selectByName(username);}public User selectById(Integer userId){return userMapper.selectById(userId);}}

BlogService

@Servicepublic class BlogService {@Resourceprivate BlogMapper blogMapper;public List<Blog> getAllBlog(){return blogMapper.getAllBlog();}public Blog getBlogByBid(Integer blogId){return blogMapper.getBlogByBid(blogId);}public void postBlog(Blog blog) {blogMapper.postBlog(blog);}public void deleteBlog(Integer blogId){blogMapper.deleteBlog(blogId);}public void updateBlog(Blog blog){blogMapper.updateBlog(blog);}public List<Blog> getAllBlogById(){return blogMapper.getAllBlogById();}}

5. 前后端交互接口设计

交互1

交互2

交互3

交互4

交互5

交互6

交互7

交互8

交互9

交互10

交互11

6. 导入前端代码

导入前端代码到 resources 的 static下

具体代码查看 文章 博客系统前端界面
https://wangzhi430.blog.csdn.net/article/details/124649884

7. 实现博客主页

这里的交互接口是 交互6

7.1 实现后端代码

@RestControllerpublic class IndexController {@Autowiredprivate BlogService blogService;@RequestMapping("/index")public List<Blog> getAllBlog() {return blogService.getAllBlog();}}

7.2 实现前端代码

 $.ajax({url: "index",method: "GET",success: function(data,status) {buildBlogs(data);}})function buildBlogs(blogs){let rightDiv = document.querySelector('.right');for(let blog of blogs){let blogDiv = document.createElement('div');blogDiv.className = 'article';// 创建 titlelet h2 = document.createElement('h2');h2.className = 'title';h2.innerHTML = blog.title;blogDiv.appendChild(h2);// 创建 postTimelet postTime = document.createElement('span');postTime.className = 'date';postTime.innerHTML = DateFormat(blog.postTime);blogDiv.appendChild(postTime);// 创建 contentlet content = document.createElement('div');content.className = 'desc';content.innerHTML = blog.content;blogDiv.appendChild(content);// 创建 详情页的超链接let detailA = document.createElement('a');detailA.className = 'more';detailA.href = 'art.html" />+ blog.blogId;detailA.innerHTML = '查看全文>>';blogDiv.appendChild(detailA);// 加入到 right 中rightDiv.appendChild(blogDiv);}}// 把毫秒级时间戳转化成格式化日期function DateFormat(timeStampMS) {var date = new Date(timeStampMS); var year = date.getFullYear(),month = date.getMonth()+1,//月份是从0开始的day = date.getDate(),hour = date.getHours(),min = date.getMinutes(),sec = date.getSeconds();var newTime = year + '-' +(month < 10? '0' + month : month) + '-' +(day < 10? '0' + day : day) + ' ' +(hour < 10? '0' + hour : hour) + ':' +(min < 10? '0' + min : min) + ':' +(sec < 10? '0' + sec : sec);return newTime;}

7.3 测试代码

7.4 解决页面内容太多超出当前浏览器

7.5 解决页面顺序不是按最新时间排序

在BlogMapper.xml中修改当前sql语句.

7.6 解决内容太多, 导致显示的时候占位太多.

7.7 再次测试代码

8. 实现博客详情页

这里的交互是 交互5

8.1 实现后端代码

根据当前blogId来获取文章, 要判断blogId是否合法, 是否存在当前blogId的文章
这里使用, message来判断, 返回的message不为空就表示异常.

@RestControllerpublic class DetailsController {@Autowiredprivate BlogService blogService;@RequestMapping("/details")public Object ShowBlog(Integer blogId) {HashMap<String,Object> map = new HashMap<>();if (blogId == null || blogId < 1) {map.put("message","blogId异常!");return map;}Blog blog = blogService.getBlogByBid(blogId);if (blog == null) {map.put("message","不存在当前blogId的文章");return map;}return blog;}}

8.2 实现前端代码

$.ajax({url: "details"+location.search,method: "GET",success: function(data,status) {if(data.message == null) {buildBlog(data);} else {alert(data.message);location.assign("home.html");}}})function buildBlog(blog){// 1. 更新 titlelet titleDiv = document.querySelector('.title');titleDiv.innerHTML = blog.title;// 2. 更新 postTimelet postTime = document.querySelector('.date');postTime.innerHTML = DateFormat(blog.postTime);editormd.markdownToHTML('content', {markdown: blog.content});}// 把毫秒级时间戳转化成格式化日期function DateFormat(timeStampMS) {var date = new Date(timeStampMS);var year = date.getFullYear(),month = date.getMonth()+1,//月份是从0开始的day = date.getDate(),hour = date.getHours(),min = date.getMinutes(),sec = date.getSeconds();var newTime = year + '-' +(month < 10" />'0' + month : month) + '-' +(day < 10? '0' + day : day) + ' ' +(hour < 10? '0' + hour : hour) + ':' +(min < 10? '0' + min : min) + ':' +(sec < 10? '0' + sec : sec);return newTime;}

8.3 测试代码

8.4 这里展示为markdown语法的正文

展示为 markdown 语法的正文.
注意这里的几段代码


这里还需要导入依赖包

9. 实现博客登录界面

这里的交互是 交互8

9.1 实现后端代码

这里要根据前端穿过来的 json 格式数据进行判断
判断当前是否存在用户, 以及当前用户密码是否正确
登录成功之后, 要创建一个session

@RestControllerpublic class LoginController {@Autowiredprivate UserService userService;@RequestMapping("/login")public Object userLogin(@RequestBody User user, HttpServletRequest request) {HashMap<String,Object> map = new HashMap<>();if (user == null) {map.put("message","当前还没有输入用户名和密码,登录失败!");return map;}User user1 = userService.selectByName(user.getUsername());if (user1 == null) {map.put("message","当前用户名不存在!");return map;}if (!user.getPassword().equals(user1.getPassword())) {map.put("message","当前用户名密码错误!");return map;}user.setUserId(user1.getUserId());HttpSession session = request.getSession(true);if (session != null) {session.setAttribute("user",user);}return map;}}

9.2 实现前端代码

这里前端去除了前后空格,以及为空的情况

let submit = document.querySelector('.button');submit.onclick = function() {let username = document.querySelector('.user');let password = document.querySelector('.password');if (username.value.trim() == ""){alert('请先输入用户名!');username.focus();return;}if (password.value.trim() == ""){alert('请先输入密码!');password.focus();return;}$.ajax({url: "login",method: "POST",data: JSON.stringify({username: username.value.trim(), password: password.value.trim()}),contentType: "application/json;charset=utf-8",success: function(data, status) {if(data.message == null) {location.assign("home.html");}else{alert(data.message);username.value="";password.value="";username.focus();}}})}

10. 实现登录判断 — 拦截器

10.1 实现自定义拦截器

public class LoginInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {HttpSession session = request.getSession(false);if (session != null && session.getAttribute("user") != null) {return true;}response.setStatus(401);response.sendRedirect("/login.html");return false;}}

10.2 将自定义拦截器加入到系统配置

@Configurationpublic class AppConfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/**/*.js").excludePathPatterns("/**/*.jpg").excludePathPatterns("/**/*.css").excludePathPatterns("/**/*.png").excludePathPatterns("/**/login.html").excludePathPatterns("/**/register.html").excludePathPatterns("/**/login").excludePathPatterns("/**/register");}}

11. 实现注册功能

这里的交互是 交互9

11.1 实现后端代码

实现一个 类 Register 来接收前端返回来的数据

class Register {public String username;public String password1;public String password2;}

这里后端需要判断当前用户名是否已经被使用.

@RestControllerpublic class RegisterController {@Autowiredprivate UserService userService;@RequestMapping("/register")public Object userRegister(@RequestBody Register register) {HashMap<String,Object> map = new HashMap<>();User user = userService.selectByName(register.username);if (user != null) {map.put("message","当前用户名已经存在了, 请更换!");return map;}User user1 = new User();user1.setUsername(register.username);user1.setPassword(register.password1);userService.addUser(user1);return map;}}

11.2 实现前端代码

要对输入内容去除前后空格,并且判空

let submit = document.querySelector('.button');submit.onclick = function() {let username = document.querySelector('.user');let password1 = document.querySelector('.password1');let password2 = document.querySelector('.password2');if(username.value.trim() == ""){alert("请先输入用户名!");username.focus();return;}if(password1.value.trim() == ""){alert('请先输入密码!');password1.focus();return;}if(password2.value.trim() == ""){alert('请再次输入密码!');password2.focus();return;}if(password1.value.trim() != password2.value.trim()) {alert('两次输入的密码不同!');passwrod1.value="";password2.value="";return;}$.ajax({url: "register",method: "POST",data: JSON.stringify({username: username.value.trim(), password1: password1.value.trim(),password2: password2.value.trim()}),contentType: "application/json;charset=utf-8",success: function(data,status){if(data.message != null){alert(data.message);username.value="";password1.value="";password2.value="";username.focus();}else{location.assign('login.html');}}})}

12. 实现注销功能

这里的交互是 交互10

12.1 实现后端代码

因为 注销功能是点击注销的时候, 触发一个logout的url, 然后发送一个请求.
这里只需要实现后端代码既可

@Controllerpublic class LogoutController {@RequestMapping("/logout")public void userLogout(HttpServletRequest request, HttpServletResponse response) throws IOException {HttpSession session = request.getSession(false);// 拦截器的拦截, 所以不可能出现session为空的情况session.removeAttribute("user");response.sendRedirect("login.html");}}

13. 实现博客编辑页

这里的交互是 交互1

13.1 实现后端代码

@RestControllerpublic class EditController {@Autowiredprivate BlogService blogService;@RequestMapping("/edit")public void postBlog(@RequestBody Blog blog, @SessionAttribute(value = "user",required = false)User user){blog.setPostTime(new Timestamp(System.currentTimeMillis()));blog.setUserId(user.getUserId());blogService.postBlog(blog);}}

13.2 实现前端代码

let submit = document.querySelector('.publish');submit.onclick = function() {let title = document.querySelector('.title');let content = document.querySelector('.content');if(title.value.trim() == ""){alert('当前文章标题为空,请输入!');title.focus();return;}if(content.value.trim() == ""){alert('当前文章内容为空,请输入!');content.focus();return;}$.ajax({url: "edit",method: "POST",data: JSON.stringify({title: title.value.trim(), content: content.value.trim()}),contentType: "application/json;charset=utf-8",success: function(data,status) {location.assign('home.html');}})}

14. 实现博客个人主页

这里的交互是 交互7
这里的前端页面主要就是主页页面的改进

14.1 实现后端代码

@RestControllerpublic class PersonController {@Autowiredprivate BlogService blogService;@RequestMapping("/person")public List<Blog> getMyBlog(@SessionAttribute(value = "user",required = false)User user) {List<Blog> blogs = blogService.getAllBlogById(user.getUserId());for (Blog blog : blogs) {if (blog.getContent().length() > 80) {blog.setContent(blog.getContent().substring(0,80) + " ...");}}return blogs;}}

14.2 实现前端代码

$.ajax({url: "person",method: "GET",success: function(data,status) {buildBlogs(data);}})function buildBlogs(blogs){let rightDiv = document.querySelector('.right');for(let blog of blogs){let blogDiv = document.createElement('div');blogDiv.className = 'article';// 创建 titlelet h2 = document.createElement('h2');h2.className = 'title';h2.innerHTML = blog.title;blogDiv.appendChild(h2);// 创建 postTimelet postTime = document.createElement('span');postTime.className = 'date';postTime.innerHTML = DateFormat(blog.postTime);blogDiv.appendChild(postTime);// 创建 contentlet content = document.createElement('div');content.className = 'desc';content.innerHTML = blog.content;blogDiv.appendChild(content);// 创建 详情页的超链接let detailA = document.createElement('a');detailA.className = 'more';detailA.href = 'art.html" />+ blog.blogId;detailA.innerHTML = '查看全文>>';blogDiv.appendChild(detailA);// 加入到 right 中rightDiv.appendChild(blogDiv);}}// 把毫秒级时间戳转化成格式化日期function DateFormat(timeStampMS) {var date = new Date(timeStampMS); var year = date.getFullYear(),month = date.getMonth()+1,//月份是从0开始的day = date.getDate(),hour = date.getHours(),min = date.getMinutes(),sec = date.getSeconds();var newTime = year + '-' +(month < 10? '0' + month : month) + '-' +(day < 10? '0' + day : day) + ' ' +(hour < 10? '0' + hour : hour) + ':' +(min < 10? '0' + min : min) + ':' +(sec < 10? '0' + sec : sec);return newTime;}

15. 实现展示用户信息的功能

这里的交互是 交互11

这里需要分情况考虑, 展示个人信息主要是 主页页面, 详情页面, 个人主页页面.
以带不带blogId来区分

15.1 实现后端代码

这里判断了 blogId丢失的情况以及,文章作者丢失情况(数据库表数据被删除的时候会出现这种错误)

@RestControllerpublic class UserController {@Autowiredprivate UserService userService;@Autowiredprivate BlogService blogService;@RequestMapping("/user")public Object getUser(Integer blogId, @SessionAttribute(value = "user",required = false)User user){if(blogId == null) {return user;}else {HashMap<String,Object> map = new HashMap<>();Blog blog = blogService.getBlogByBid(blogId);if(blog == null) {map.put("message","不存在当前blogId的文章");return map;}User author = userService.selectById(blog.getUserId());if(author == null){map.put("message","当前文章作者出错");return map;}return author;}}}

15.2 实现前端代码

详情页的情况:

$.ajax({url: "user"+location.search,method: "GET",success: function(data,status) {if(data.message == null){let username = document.querySelector('.name');username.innerHTML = data.username;}else{alert(data.message);location.assign('home.html');}}})

个人主页和主页的情况

$.ajax({url: "user",method: "GET",success: function(data,status){let username = document.querySelector('.name');username.innerHTML = data.username;}})

16. 实现博客的删除功能

这里需要用到 交互2
这里在详情页的时候进行构建, 在Blog实体类中加一项 isAuthor, 为1的时候就是当前文章就是作者.
前端接收到这个的时候, 进行判断, 如果为1就显示删除的按钮.

16.1 改进代码

16.2 实现后端代码

@Controllerpublic class DeleteController {@Autowiredprivate BlogService blogService;@RequestMapping("/delete")public Object deleteBlog(Integer blogId) {blogService.deleteBlog(blogId);return "/home.html";}}

17. 实现博客的修改功能

这里的交互是 交互3 和 交互4
交互3是在新的页面进行加载

17.1 实现后端代码

@RestControllerpublic class UpdateController {@Autowiredprivate BlogService blogService;@RequestMapping("/updateLoad")public Object updateLoad(Integer blogId){HashMap<String, Object> map = new HashMap<>();if(blogId == null) {map.put("message","blogId丢失!");return map;}Blog blog = blogService.getBlogByBid(blogId);if(blog == null) {map.put("blog","不存在当前blog的文章!");return map;}return blog;}@RequestMapping("/update")public Object Update(Integer blogId, @RequestBody Blog blog, @SessionAttribute(value = "user",required = false)User user) {HashMap<String, Object> map = new HashMap<>();if(blogId == null) {map.put("message","blogId丢失!");return map;}blog.setBlogId(blogId);blog.setUserId(user.getUserId());blogService.updateBlog(blog);return map;}}

17.2 实现前端代码

$.ajax({url: "updateLoad"+location.search,method: "GET",success: function(data,status) {if(data.message == null) {let title = document.querySelector('.title');title.value=data.title;let content = document.querySelector('.content');content.value=data.content;}else{alert(data.message);location.assign('home.html');}}})// 初始化编辑器var editor = editormd("editor", {// 这里的尺寸必须在这里设置. 设置样式会被 editormd 自动覆盖掉.width: "100%",// 高度 100% 意思是和父元素一样高. 要在父元素的基础上去掉标题编辑区的高度height: "calc(100% - 60px)",// 指定 editor.md 依赖的插件路径path: "editor.md/lib/",// 放到 textarea中saveHTMLToTextArea: true});let submit = document.querySelector('.publish');submit.onclick = function() {let title = document.querySelector('.title');let content = document.querySelector('.content');if(title.value.trim() == ""){alert('当前文章标题为空,请输入!');title.focus();return;}if(content.value.trim() == ""){alert('当前文章内容为空,请输入!');content.focus();return;}$.ajax({url: "update"+location.search,method: "POST",data: JSON.stringify({title: title.value.trim(), content: content.value.trim()}),contentType: "application/json;charset=utf-8",success: function(data,status) {if(data.message == null){location.assign('home.html');}else{alert(data.message);location.assign('home.html');}}})}