基于 SpringBoot + MyBatis 的博客系统

伤心客 · 2022-6-26 03:13:00

文章目录

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

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application-dev.properties 配置内容

spring.datasource.url=jdbc:mysql://localhost:3306/MyBlogSystem?characterEncoding=utf8&useSSL=true
spring.datasource.username=root
spring.datasource.password=0000
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
mybatis.mapper-locations=classpath:mapper/**Mapper.xml

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4. 数据库实现用户和博客管理

4.1 设计数据库

这里博客系统, 是一个用户表和博客表,
用户一般分为:

用户Id (每个人一个且互不相同)
用户名 (每个人的用户名不相同)
密码
用户头像(暂不实现)
用户马云地址(暂不实现)

博客一般分为:

博客Id (每篇博客一个且互不相同)
标题
正文
创建时间
修改时间 (这里没用到, 自己想加也可以)
用户Id (可以设置一个外键,这里没设置)

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)
);

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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

<?xml version="1.0" encoding="UTF-8"?>
<!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>

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BlogMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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>

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User 实体类和 Blog 实体类

在 model 包下创建 User 类和 Blog 类
User 类

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

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Blog 类

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

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UserMapper 接口和 BlogMapper 接口

在 mapper 包下创建 UserMapper 和 BlogMapper 接口
UserMapper

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

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BlogMapper

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

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UserService 类和 BlogService 类

service 包下创建 UserService类 和 BlogService类
UserService

@Service
public class UserService {
@Resource
private 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);
}
}

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BlogService

@Service
public class BlogService {
@Resource
private 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();
}
}

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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

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

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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 title
let h2 = document.createElement('h2');
h2.className = 'title';
h2.innerHTML = blog.title;
blogDiv.appendChild(h2);
// 创建 postTime
let postTime = document.createElement('span');
postTime.className = 'date';
postTime.innerHTML = DateFormat(blog.postTime);
blogDiv.appendChild(postTime);
// 创建 content
let 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?blogId=' + 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;
}

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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.

@RestController
public class DetailsController {
@Autowired
private 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;
}
}

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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 title
let titleDiv = document.querySelector('.title');
titleDiv.innerHTML = blog.title;
// 2. 更新 postTime
let 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;
}

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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

@RestController
public class LoginController {
@Autowired
private 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;
}
}

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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();
}
}
})
}

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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 {
@Override
public 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;
}
}

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10.2 将自定义拦截器加入到系统配置

@Configuration
public class AppConfig implements WebMvcConfigurer {
@Override
public 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");
}
}

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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;
}

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这里后端需要判断当前用户名是否已经被使用.

@RestController
public class RegisterController {
@Autowired
private 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;
}
}

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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');
}
}
})
}

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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

@Controller
public 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");
}
}

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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

@RestController
public class EditController {
@Autowired
private 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);
}
}

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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');
}
})
}

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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

@RestController
public class PersonController {
@Autowired
private 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;
}
}

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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 title
let h2 = document.createElement('h2');
h2.className = 'title';
h2.innerHTML = blog.title;
blogDiv.appendChild(h2);
// 创建 postTime
let postTime = document.createElement('span');
postTime.className = 'date';
postTime.innerHTML = DateFormat(blog.postTime);
blogDiv.appendChild(postTime);
// 创建 content
let 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?blogId=' + 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;
}

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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)

@RestController
public class UserController {
@Autowired
private UserService userService;
@Autowired
private 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;
}
}
}

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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');
}
}
})

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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;
}
})

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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

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

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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

@RestController
public class UpdateController {
@Autowired
private 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;
}
}

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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');
}
}
})
}

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