目录
前端:
register.html
login.html
success.html
style.css
后端:
com.example.entity.User
数据库建表(user)
编辑 com.example.mapper.UserMapper
com.example.controller.UserController
注册逻辑:
登录逻辑:
application.properities
pom.xml
调试:
注册:
登录:
前端:
register.html
<!DOCTYPE html> <html lang="en" > <head> <meta charset="UTF-8"> <title>register</title> <link rel="stylesheet" type="text/css" href="/css/style.css" /> </head> <body> <div class="control"> <div class="item"> <div class="active">注册</div> </div> <div class="content"> <div style="display: block;"> <form action="/user/register" method="post"> <p>用户名</p> <input type="text" placeholder="请输入用户名" name="username" /> <p>密码</p> <input type="password" placeholder="请输入密码" name ="password"/> <br/> <input type="submit" value="注册"/> </form> <p>已注册,<a href="/user/login" target="top">去登录</a></p> </div> </div> </div> </body> </html>
login.html
<!DOCTYPE html> <html lang="en" > <head> <meta charset="UTF-8"> <title>login</title> <link href="/css/style.css" type="text/css" rel="stylesheet"> <script src="/static/js/change.js"></script> </head> <body> <div class="control"> <div class="item"> <div class="active">登录</div> </div> <div class="content"> <div style="display: block;"> <form action="/user/login" method="post"> <p>账号</p> <input type="text" placeholder="请输入用户名" name="username"/> <p>密码</p> <input type="password" placeholder="请输入密码" name="password"/> <br/> <input type="submit" value="登录"/> </form> <p>没有账号,<a href="/user/register" target="top">去注册</a></p> </div> </div> </div> </body> </html>
success.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> 登录成功 </body> </html>
style.css
*{ margin: 0; padding: 0; } body{ background: #f3f3f3; } .control{ width: 340px; background: white; position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); border-radius: 5px; } .item{ width: 340px; height: 60px; background: #eeeeee; } .item div{ width: 340px; height: 60px; display: inline-block; color: black; font-size: 18px; text-align: center; line-height: 60px; cursor: pointer; } .content{ width: 100%; } .content div{ margin: 20px 30px; display: none; text-align: left; } p{ color: #4a4a4a; margin-top: 30px; margin-bottom: 6px; font-size: 15px; } .content input[type="text"], .content input[type="password"]{ width: 100%; height: 40px; border-radius: 3px; border: 1px solid #adadad; padding: 0 10px; box-sizing: border-box; } .content input[type="submit"]{ margin-top: 40px; width: 100%; height: 40px; border-radius: 5px; color: white; border: 1px solid #adadad; background: cyan; cursor: pointer; letter-spacing: 4px; margin-bottom: 40px; } .active{ background: white; } .item div:hover{ background: #f6f6f6; }
后端:
com.example.entity.User
@Data @Accessors(chain = true) @EqualsAndHashCode(callSuper = false) @Table( "user") public class User { private String username; private String password; }
数据库建表(user)
com.example.mapper.UserMapper
@Mapper public interface UserMapper extends BaseMapper<User> { @Select(value = "select u.username,u.password from user u where u.username=#{username}") User findUserByName(@Param("username") String username); }
com.example.controller.UserController
@Controller @RequestMapping("user") public class UserController { @Autowired private UserMapper userMapper; @RequestMapping("/register") public String register(User user, Model m) { if (user.getUsername()!=null&&userMapper.findUserByName(user.getUsername()) == null) { //判断用户是否已经存在 if (!user.getUsername().isEmpty()) { //注册的时候,用户名不能为空 if (!user.getPassword().isEmpty()) { //注册 的时候,密码不能为空*/ userMapper.insert(user); return "html/login"; } else { m.addAttribute("msg", "用户名已经存在!"); return "html/register"; } } else { m.addAttribute("msg", "用户名不能为空!"); return "html/register"; } } else { m.addAttribute("msg", "密码不能为空!"); return "html/register"; } } @RequestMapping("/login" ) public String login( User user, Model m){ User exitUser=userMapper.findUserByName(user.getUsername()); if(user.getUsername()==null||user.getUsername().isEmpty()){ m.addAttribute("msg","用户名不能为空"); return "html/login"; } if(user.getPassword()==null||user.getPassword().isEmpty()){ m.addAttribute("msg","密码不能为空"); return "html/login"; } if(exitUser==null){ m.addAttribute("msg","该用户未注册"); return "html/login"; } if(!user.getPassword().equals(exitUser.getPassword())){ m.addAttribute("msg","用户输入的密码有误"); return "html/login"; }else{ m.addAttribute("msg","登录成功"); return "html/success"; } } }
注册逻辑:
1.判断要创建的用户在数据库是否存在,如果不存在就注册
2.注册的时候用户名不能为空
3.注册的时候密码不能为空
登录逻辑:
1.判断要登录的用户在数据库是否存在,如果存在就登录
2.登录的时候,输入的密码要与数据库里对应的用户的密码保持一致
3.登录的时候,输入用户名与密码不能为空
application.properities
spring.datasource.url=jdbc:mysql://localhost:3306/springboot?serverTimezone=GMT spring.datasource.username=root spring.datasource.password=1234
pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.5.0</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>register-login</artifactId> <version>0.0.1-SNAPSHOT</version> <name>register-login</name> <description>register-login</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.mysql</groupId> <artifactId>mysql-connector-j</artifactId> <version>8.0.33</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>com.mybatis-flex</groupId> <artifactId>mybatis-flex-spring-boot-starter</artifactId> <version>1.6.4</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>com.mybatis-flex</groupId> <artifactId>mybatis-flex-spring-boot-starter</artifactId> <version>1.6.4</version> </dependency> <dependency> <groupId>com.mybatis-flex</groupId> <artifactId>mybatis-flex-spring-boot-starter</artifactId> <version>1.6.4</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <fork>true</fork> <excludes> <exclude> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </exclude> </excludes> </configuration> </plugin> </plugins> </build> </project>
调试:
注册:
如果注册的用户在数据库中不存在,且注册的时候,用户名与密码都不为空,则跳转到
登录界面,反之,任意一个条件都不满足的话就不会跳转到登录界面
登录:
如果登录的用户在数据库中存在,且登录的时候,用户名不为空,密码不为,则跳转到
成功界面(success.html),反之,任意一个条件都不满足的话就不会跳转到成功界面。