SpringBoot+Mybatis实现登录注册的示例代码
学习SpringBoot+Mybatis实现的登录注册功能的Demo,实现这个Demo在网上也参考了资料和代码,本文是本人在实现Demo后的个人总结,以便理清思路。
1.环境
- jdk8 : “1.8.0_281”
- Maven: 3.6.3
- Idea:2020.2
- Mysql:5.6.40
- Navicat:10.1.7
2.步骤
2.1 创建一个SpringBoot项目
选择依赖如下:
Web下的Spring Web。
Template Engines下的Thymeleaf。
SQL下的JDBC API、Spring Data JDBC、MySQL Driver。
项目的结构:
2.2 pom依赖配置
<?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>2.4.3</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.haungkd</groupId> <artifactId>weblogindemo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>weblogindemo</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</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>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <!-- mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.3</version> </dependency> <!--lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.12</version> <scope>provided</scope> </dependency> <!--druid连接池--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.2.3</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.xmlunit</groupId> <artifactId>xmlunit-core</artifactId> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.6</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2.3 设置配置文件
yml文件配置:
其中url中的数据库记得对应,我的库为login
spring: datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/login?serverTimezone=GMT%2B8&useSSL=true username: root #数据库 password: 123456 #密码
properties文件配置:
#端口号 server.port=8088 #druid数据库连接池 type=com.alibaba.druid.pool.DruidDataSource #清除缓存 spring.thymeleaf.cache=false #配置mapper mybatis.mapper-locations=classpath:mapper/*.xml
2.4 在pojo包下创建实体类UserLogin
package com.huangkd.weblogindemo.pojo; import javax.persistence.Table; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data // get/set 方法 @AllArgsConstructor//有参构造器 @NoArgsConstructor//无参构造器 @Table(name = "userlogin") public class UserLogin { private String username; private String password; public String getUsername() { return username; } }
2.5创建数据库和数据表
我创建login库,创建userlogin表,字段为username和password
2.6 连接数据库
在IDEA右边选择:
Database——> ——> Data Source——> Mysql
如果测试不通:出现如下:
Server returns invalid timezone. Need to set ‘serverTimezone' property.
是数据库时区问题
解决方法:
打开开最右侧 Advanced,找到 serverTimezone,在右侧value处填写 GMT,保存即可
2.7Mapper层(Dao):数据库持久层
在mapper包下建UserLoginMapper接口
package com.huangkd.weblogindemo.mapper; import com.huangkd.weblogindemo.pojo.UserLogin; import org.apache.ibatis.annotations.Mapper; import org.springframework.stereotype.Repository; import java.util.List; @Mapper @Repository public interface UserLoginMapper { //定义增删改查方法 //查询所有 public List<UserLogin> queryAll(); //添加数据 public int add(UserLogin userLogin); //根据用户名查询 public UserLogin queryByUsername(String username); }
在resources下建UserLoginMapper.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.huangkd.weblogindemo.mapper.UserLoginMapper"> <select id="queryAll" resultType="com.huangkd.weblogindemo.pojo.UserLogin"> select * from userlogin </select> <insert id="add" parameterType="com.huangkd.weblogindemo.pojo.UserLogin"> insert into userlogin values (#{username},#{password}) </insert> <select id="queryByUsername" resultType="com.huangkd.weblogindemo.pojo.UserLogin"> select * from userlogin where username=#{username} </select> </mapper>
2.8 Service层:业务逻辑层
在services下新建接口UserLoginServicesI和类UserLoginServicesImpl
UserLoginServicesI接口:
import com.huangkd.weblogindemo.pojo.UserLogin; import java.util.List; public interface UserLoginServicesl { //查询所有 public List<UserLogin> queryAll(); //添加数据 public int add(UserLogin userLogin); //根据用户名查询 public UserLogin queryByUsername(String username); }
UserLoginServicesImpl类:
package com.huangkd.weblogindemo.services; import com.huangkd.weblogindemo.mapper.UserLoginMapper; import com.huangkd.weblogindemo.pojo.UserLogin; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; @Service public class UserLoginServicesImpl implements UserLoginServicesl { @Autowired //Service层调用dao层/mapper层 一般在service层中创建一个dao/mapper层对象 //用对象调用对应的增删改查方法 UserLoginMapper userLoginMapper; @Override public List<UserLogin> queryAll() { return userLoginMapper.queryAll(); } @Override public int add(UserLogin userLogin) { return userLoginMapper.add(userLogin); } @Override public UserLogin queryByUsername(String username) { return userLoginMapper.queryByUsername(username); } }
2.9 Controller层:控制层
在controller包下创建MyController类:
package com.huangkd.weblogindemo.controller; import com.huangkd.weblogindemo.pojo.UserLogin; import com.huangkd.weblogindemo.services.UserLoginServicesImpl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class MyController { //controller层调用service层 //创建一个service层对象 @Autowired UserLoginServicesImpl userLoginServices; //登录 @RequestMapping("/toLogin") public String toLogin() { return "login"; } @RequestMapping("/loginSuccess") public String loginSuccess(Model model, UserLogin userLogin) { //查询用户名是否存在 UserLogin userLogin1 = userLoginServices.queryByUsername(userLogin.getUsername()); if (userLogin1 != null) { //如果用户名存在 if (userLogin1.getPassword().equals(userLogin.getPassword())) { System.out.println(userLogin1.toString()); return "success"; } else { model.addAttribute("data", "密码不正确"); return "login"; } } else { //用户名不存在,直接返回到登录页面 model.addAttribute("data", "该用户不存在,请先注册"); return "login"; } } //注册 @RequestMapping("/toRegister") public String toRegister() { return "register"; } @RequestMapping("/toRegisterSuccess") public String toRegisterSuccess(Model model,UserLogin userLogin) { //添加一条记录到数据库中 int add = userLoginServices.add(userLogin); System.out.println("插入数据成功"); model.addAttribute("data","注册成功,请登录"); return "login"; } }
2.10 前端页面
login.html:登录页面
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>login</title> </head> <body background="back.jpg"> <div align="center"> <br><br><h2>登录界面</h2><br><br> <span th:text="${data}" style="text-color:red;font-size: 10px"></span> <form method="get" action="/loginSuccess"> 用户名:<input type="text" name="username" placeholder="请输入用户名" required/><br><br> 密码:<input type="text" name="password" placeholder="请输入密码" required/><br><br> <input type="submit" value="登录"> </form> <br> <form method="get" action="/toRegister"> <input type="submit" value="注册"> </form> </div> </body> </html>
regsister.html:注册页面
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>register</title> </head> <body background="back.jpg" > <div align="center"> <br><br><h1>注册界面</h1><br><br> <form method="get" action="/toRegisterSuccess"> 用户名:<input type="text" name="username" placeholder="请输入用户名" required/><br><br> 密码:<input type="text" name="password" placeholder="请输入密码" required/><br><br> 确认密码:<input type="text" name="password2" placeholder="请输入密码" required/><br><br> <input type="submit" value="注册"> </form> </div> </body> </html>
success.html:成功页面
成功页面我复制本人csdn首页源代码
3.测试
登录:
注册:
成功:
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