随笔 - 355  文章 - 0  评论 - 3  阅读 - 62834

个人博客平台随笔2

1.按照需求， 编写实体类po，处理实体类之间的关系

通常many作为维护端，one作为被维护端（感觉JPA框架好麻烦。。。感觉mybatis方便多了

 如type和blog之间的关系为一对多（多对多的情况也需要指定某一方作为被维护端）

 

 启动后看数据库是否能够生成相关的表

2.编写service层和dao层

 例如：service/UserService.java

package com.example.service;

import com.example.po.User;

public interface UserService {

    User checkUser(String username, String password);
}

service/UserServiceImpl.java

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package com.example.service;

import com.example.dao.UserRepository;
import com.example.po.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    private UserRepository userRepository;

    @Override
    public User checkUser(String username, String password) {
        User user =userRepository.findByUsernameAndPassword(username,password);
        return user;
    }
}
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dao/UserRepository.java

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package com.example.dao;

import com.example.po.User;
import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository extends JpaRepository<User, Long> {

    User findByUsernameAndPassword(String username, String password);
}
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web/loginController.java中

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package com.example.web;

import com.example.po.User;
import com.example.service.UserService;
import jakarta.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
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;

@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";
    }

}
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<!DOCTYPE html>
<html lang="en">
<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@2.5.0/dist/semantic.min.css">
    <link rel="stylesheet" href="../../static/css/my.css">
</head>

<body>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<div class="m-container-small" 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}">用户名密码错误</div>
                </form>

            </div>
        </div>
    </div>
</div>

<!--/*/<th:block th:replace="_fragments :: script">/*/-->
<script src="https://cdn.jsdelivr.net/npm/jquery@3.6/dist/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/semantic-ui@2.5.0/dist/semantic.min.js"></script>
<!--/*/</th:block>/*/-->

<script>
    $('.ui.form').form({
        fields : {
            username : {
                identifier: 'username',
                rules : [{
                    type : 'empty',
                    prompt : '标题：请输入用户名'
                }]
            },
            password : {
                identifier: 'password',
                rules : [{
                    type : 'empty',
                    prompt : '标题：请输入密码'
                }]
            }
        }
    });
</script>

</body>
</html>
前端登录页面
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3.MD5加密

util/MD5Util.java

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package com.example.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util {

    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));
            }
            return buf.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
    
//    public static void main(String[] args) {
//        System.out.println(code("123456"));
//    }

}
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 4.添加登录拦截器

interceptor/LoginInterceptor.java

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package com.example.interceptor;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;

//登录拦截
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,
                             Object handler) throws Exception {
        if (request.getSession().getAttribute("user") == null) {
            response.sendRedirect("/admin");
            return false;
        }

        return true;
    }
}
View Code
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interceptor/WebConfig.java

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package com.example.interceptor;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

//配置类
@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor())
                .addPathPatterns("/admin/**")
                .excludePathPatterns("/admin")
                .excludePathPatterns("/admin/login");

    }
}
View Code
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posted on   201812  阅读(3)  评论(0)  编辑  收藏  举报
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