文章目录
- 一、后台登录
- （一）构建登录页面 - login.html
- （二）后台管理页面 - index.htm
- （三）创建用户接口UserService
- （四）创建用户接口实现UserServiceImpl
- （五）创建UserRepository接口
- （六）创建登录控制器LoginController
- （七）MD5加密:创建工具类MD5Utils
- （八）将数据库密码加密
- （九）创建登录拦截器BlogController
- （十）创建登录过滤器LoginInterceptor
- （十一）创建配置类WebConfig
- （十二）运行查看效果
一、后台登录
1、构建登录页面和后台管理首页
2、UserService和UserRepository
3、LoginController实现登录
4、MD5加密
5、登录拦截器
（一）构建登录页面 - login.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head th:replace="admin/_fragments :: head(~{::title})">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>博客管理登录</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.css">
<link rel="stylesheet" href="../../static/css/me.css">
</head>
<body>
<br>
<br>
<br>
<div class="m-container-small m-padded-tb-massive" style="max-width: 30em !important;">
<div class="ui container">
<div class="ui middle aligned center aligned grid">
<div class="column">
<h2 class="ui teal image header">
<div class="content">
管理后台登录
</div>
</h2>
<form class="ui large form" method="post" action="#" th:action="@{/admin/login}">
<div class="ui segment">
<div class="field">
<div class="ui left icon input">
<i class="user icon"></i>
<input type="text" name="username" placeholder="用户名">
</div>
</div>
<div class="field">
<div class="ui left icon input">
<i class="lock icon"></i>
<input type="password" name="password" placeholder="密码">
</div>
</div>
<button class="ui fluid large teal submit button">登 录</button>
</div>
<div class="ui error mini message"></div>
<div class="ui mini negative message" th:unless="${#strings.isEmpty(message)}" th:text="${message}">用户名和密码错误</div>
</form>
</div>
</div>
</div>
</div>
<!--/*/<th:block th:replace="_fragments :: script">/*/--><!--加/*/静态页面注释有效，动态页面注释无效-->
<script src="https://cdn.jsdelivr.net/npm/jquery@3.2/dist/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.js"></script>
<!--/*/</th:block>/*/-->
<script>
$('.ui.form').form({
fields : {
username: {
identifier : 'username',
rules : [{
type :'empty',
prompt : '请输入用户名'
}]
},
password: {
identifier: 'password',
rules: [{
type: 'empty',
prompt: '请输入密码'
}]
}
}
});
</script>
</body>
</html>（二）后台管理页面 - index.htm
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head th:replace="admin/_fragments :: head(~{::title})">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>博客管理</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.css">
<link rel="stylesheet" href="../../static/css/me.css">
</head>
<body>
<!--导航-->
<nav th:replace="admin/_fragments ::menu(0)" class="ui inverted attached segment m-padded-tb-mini m-shadow-small">
<div class="ui container">
<div class="ui inverted secondary stackable menu">
<h2 class="ui teal header item">管理后台</h2>
<a href="#" class="active m-item item m-mobile-hide"><i class="home icon"></i>博客</a>
<a href="#" class="m-item item m-mobile-hide"><i class="idea icon"></i>分类</a>
<a href="#" class="m-item item m-mobile-hide"><i class="tags icon"></i>标签</a>
<div class="right m-item m-mobile-hide menu">
<div class="ui dropdown item">
<div class="text">
<img class="ui avatar image" src="https://unsplash.it/100/100?image=1005">
袁晓晓
</div>
<i class="dropdown icon"></i>
<div class="menu">
<a href="#" th:href="@{/admin/logout}" class="item">注销</a>
</div>
</div>
</div>
</div>
</div>
<a href="#" class="ui menu toggle black icon button m-right-top m-mobile-show">
<i class="sidebar icon"></i>
</a>
</nav>
<!--中间内容-->
<div class="m-container-small m-padded-tb-big">
<div class="ui container">
<div class="ui success large message">
<h3>Hi,</h3>
<p>袁晓晓，欢迎登陆！</p>
</div>
<img src="https://unsplash.it/1000/400?image=1005" alt="" class="ui rounded bordered fluid image">
</div>
</div>
<br>
<br>
<!--底部footer-->
<footer th:replace="admin/_fragments :: footer" class="ui inverted vertical segment m-padded-tb-massive">
<div class="ui center aligned container">
<div class="ui inverted divided stackable grid">
<div class="three wide column">
<div class="ui inverted link list">
<div class="item">
<img src="../../static/images/wechat.jpg" class="ui rounded image" alt="" style="width: 110px">
</div>
</div>
</div>
<div class="three wide column">
<h4 class="ui inverted header m-text-thin m-text-spaced">最新博客</h4>
<div class="ui inverted link list">
<a href="#" class="item">用户故事（User Story）</a>
<a href="#" class="item">用户故事（User Story）</a>
<a href="#" class="item">用户故事（User Story）</a>
</div>
</div>
<div class="three wide column">
<h4 class="ui inverted header m-text-thin m-text-spaced">联系我</h4>
<div class="ui inverted link list">
<a href="#" class="item">Email: listen@169.com</a>
<a href="#" class="item">QQ: 2293432330</a>
</div>
</div>
<div class="seven wide column">
<h4 class="ui inverted header m-text-thin m-text-spaced">Lirenmi</h4>
<p class="m-text-thin m-text-spaced m-opacity-mini">这是我的个人博客，会分享关于编程、写作、思考相关的任何内容，希望可以给来到这儿的人有所帮助...</p>
</div>
</div>
<div class="ui inverted section divider"></div>
<p class="m-text-thin m-text-spaced m-opacity-tiny">Copyright@2019-2022Lirenml Designed by Lirenmi</p>
</div>
</footer>
<!--/*/<th:block th:replace="_fragments :: script">/*/--><!--加/*/静态页面注释有效，动态页面注释无效-->
<script src="https://cdn.jsdelivr.net/npm/jquery@3.2/dist/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.js"></script>
<!--/*/</th:block>/*/-->
<script>
$('.menu.toggle').click(function () {
$('.m-item').toggleClass('m-mobile-hide');
});
$('.ui.dropdown').dropdown({
on : 'hover'
});
</script>
</body>
</html>（三）创建用户接口UserService
（四）创建用户接口实现UserServiceImpl
（五）创建UserRepository接口
（六）创建登录控制器LoginController
src/main/java/net.lbj/web/admin/LoginController
package net.lbj.web.admin;
import net.lbj.po.User;
import net.lbj.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import javax.servlet.http.HttpSession;
/**
* 20210623
*/
@Controller
@RequestMapping("/admin")
public class LoginController {
@Autowired
private UserService userService;
@GetMapping
public String loginPage() {
return "admin/login";
}
@PostMapping("/login")
public String login(@RequestParam String username,
@RequestParam String password,
HttpSession session,
RedirectAttributes attributes) {
User user = userService.checkUser(username, password);
if (user != null) {
user.setPassword(null);
session.setAttribute("user", user);
return "admin/index";
} else {
attributes.addFlashAttribute("message","用户名和密码错误");
return "redirect:/admin";
}
}
@GetMapping("/logout")
public String logout(HttpSession session) {
session.removeAttribute("user");
return "redirect:/admin";
}
}（七）MD5加密:创建工具类MD5Utils
输入：不定长度信息（要加密的信息）
package net.lbj.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* 20210623
*/
public class MD5Utils {
/**
* MD5加密类
* @param str 要加密的字符串
* @return 加密后的字符串
*/
public static String code(String str) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(str.getBytes());
byte[]byteDigest = md.digest();
int i;
StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < byteDigest.length; offset++) {
i = byteDigest[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
//32位加密
return buf.toString();
//16位加密
//return buf.toString().substring(8, 24);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return null;
}
}
public static void main(String[] args) {
System.out.println(code("111111"));
}
}运行效果：
111111加密：96e79218965eb72c92a549dd5a330112
（八）将数据库密码加密
（九）创建登录拦截器BlogController
（十）创建登录过滤器LoginInterceptor
（十一）创建配置类WebConfig
（十二）运行查看效果
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