SpringBoot+mybatis+thymeleaf实现登录功能示例
1.项目文件目录一栏
2.开始工作
先按照上图建立好相应的controller,mapper等文件。接着进行一个配置首先是application.properties
server.port=8080#启动端口#加载Mybatis配置文件mybatis.mapper-locations = classpath:mapper/*.xml#数据源必填项spring.datasource.driver-class-name= com.mysql.cj.jdbc.Driverspring.datasource.url = jdbc:mysql://localhost:3306/studentmanage?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMTspring.datasource.username = rootspring.datasource.password = 123456
接着是spring启动主函数java文件
/*扫描mapper,防止找不到dao层文件，就写上*/@MapperScan(basePackages = {'com.example.learn.Dao'})@SpringBootApplicationpublic class LearnApplication { public static void main(String[] args) { SpringApplication.run(LearnApplication.class, args); }}
配置好以后开始从数据库出发
用户表结构(表名：user_info)
根据用户表，在entity建立实体类User.java,编译器都有相应的操作可以一键生成getter,setter,toString,只需定义好变量即可。
public class User { private String username; private String password; 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; } @Override public String toString() { return 'User{' +'username=’' + username + ’’’ +', password=’' + password + ’’’ +’}’; }}
接着是Dao层
import com.example.learn.Entity.User;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param;import org.springframework.stereotype.Component;@Mapper@Component(value = 'userDao')//这些都为配置注释public interface UserDao {//登录 public User login(@Param('username') String username,@Param('password') String password);}
dao层写完，在写dao层配套的sql语句(mybatis功能)mapper包里面建立.xml文件
<?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.learn.Dao.UserDao'> <select resultType='com.example.learn.Entity.User'> select * from user_info where username=#{username} and password=#{password} </select></mapper>
弄完这些接着到service层，包括impl接口实现首先是service接口
import com.example.learn.Entity.User;public interface UserService { public User login(String username, String password);}
接着是Impl下的实现类
import com.example.learn.Dao.UserDao;import com.example.learn.Entity.User;import com.example.learn.Service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Service('UserService')public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; @Override public User login(String username, String password) { return userDao.login(username,password); }}
最后就是Controller
import com.example.learn.Entity.User;import com.example.learn.Service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PostMapping;import javax.servlet.http.HttpServletRequest;@Controllerpublic class UserController { @Autowired private UserService userService; @PostMapping('/login')//可以换成@RequestMapping,action那里使用的命名 public String login(HttpServletRequest request, User u){ String username=request.getParameter('username'); String password=request.getParameter('password'); u=userService.login(username,password); if(u!=null){ return 'success';//到success的动态网页 } return 'redirect:/login.html';//这里是定向到login.html静态网页 }}
3.测试工作
先在表中插入测试数据用户和密码再建立两个html来测试功能static/login.html
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>登陆</title></head><body> <form method='post' action='/login'> <input type='text' name='username' placeholder='用户名'> <input type='password' name='password' placeholder='密码'> <input type='submit' value='登录'> </form></body></html>
templates/success
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>Title</title></head><body>成功</body></html>
登录测试
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