环境说明

1. mysql 5.7版本
2. mysql中创建sx的数据库，在sx数据库中有一张t_user的表
3. t_user的表中的字段有id,avatar,create_time,email,nickname,password,type,update_time,username
4. 通过SpringBoot+Hibernate实现登录功能

项目代码

项目整体结构

dao层

UserDao接口

package top.allone8.dao;

import org.springframework.data.jpa.repository.JpaRepository;
import top.allone8.po.User;

public interface UserDao extends JpaRepository<User,Long> {
    User findByUsernameAndPassword(String username,String password);
}

po层

User类

package top.allone8.po;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;


@Entity
@Table(name = "t_user")
public class User {

    @Id
    @GeneratedValue
    private Long id;
    private String nickname;
    private String username;
    private String password;
    private String email;
    private String avatar;
    private Integer type;
    @Temporal(TemporalType.TIMESTAMP)
    private Date createTime;
    @Temporal(TemporalType.TIMESTAMP)
    private Date updateTime;

    @OneToMany(mappedBy = "user")
    private List<Blog> blogs = new ArrayList<>();

    public User() {
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getAvatar() {
        return avatar;
    }

    public void setAvatar(String avatar) {
        this.avatar = avatar;
    }

    public Integer getType() {
        return type;
    }

    public void setType(Integer type) {
        this.type = type;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public Date getUpdateTime() {
        return updateTime;
    }

    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }


    public List<Blog> getBlogs() {
        return blogs;
    }

    public void setBlogs(List<Blog> blogs) {
        this.blogs = blogs;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", nickname='" + nickname + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", email='" + email + '\'' +
                ", avatar='" + avatar + '\'' +
                ", type=" + type +
                ", createTime=" + createTime +
                ", updateTime=" + updateTime +
                '}';
    }
}

service层

UserService类

package top.allone8.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import top.allone8.dao.UserDao;
import top.allone8.po.User;
import top.allone8.service.IUserService;
import top.allone8.util.MD5Util;

@Service
public class UserService implements IUserService {
    
    @Autowired
    private UserDao userDao;
    
    @Override
    public User checkUser(String username, String password) {
        return userDao.findByUsernameAndPassword(username, MD5Util.code(password));
    }
}

IUserService接口

package top.allone8.service;

import top.allone8.po.User;

public interface IUserService {
    User checkUser(String username,String password);
}

util

MD5Util类

package top.allone8.util;

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

public class MD5Util {

    /**
     * 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位的加密
            //return buf.toString().substring(8, 24);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }

    }


    public static void main(String[] args) {
        System.out.println(code("test1"));
    }
}

web层

package top.allone8.web;


import org.hibernate.Session;
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.servlet.mvc.support.RedirectAttributes;
import top.allone8.po.User;
import top.allone8.service.IUserService;

import javax.servlet.http.HttpSession;

@Controller
@RequestMapping("/admin")
public class LoginController {

    @Autowired
    private IUserService userService;

    @GetMapping
    public String toLogin(){
        return "admin/login";
    }


    @PostMapping("/login")
    public String login(String username, String password, HttpSession session, RedirectAttributes redirectAttributes){
        User user =userService.checkUser(username,password);
        if (user!=null){
            session.setAttribute("user",user);
            return "admin/index";
        }else {
            redirectAttributes.addFlashAttribute("message","用户名和密码错误");
            return "redirect:/admin";
        }
    }

    @GetMapping("/logout")
    public String logout(HttpSession session){
        session.removeAttribute("user");
        return "admin/login";
    }

}

HTML关键代码

login.html

 <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>

_fragments.html

  <div class="menu">
    <a href="#" th:href="@{/admin/logout}" class="item">注销</a>
  </div>

application.yml

server:
  port: 8080
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/sx?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    username: root
    password:
  thymeleaf:
    mode: HTML
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

pom.xml

<properties>
    <java.version>1.8</java.version>
    <!-- <thymeleaf.version>3.0.11</thymeleaf.version>-->
    <thymeleaf-layout-dialect.version>2.1.1</thymeleaf-layout-dialect.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-aop</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>