IDEA下创建SpringBoot+MyBatis+MySql项目实现动态登录与注册功能

一、搭建springboot项目

1.1、file ——> new ——> project——> spring initializr——> next——> next——> next——> finish

注意选择包依赖关系

二、springboot整合mybatis.mysql

2.1、整体结构

2.2、设置所需要的依赖

即pom.xml文件

<?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>2.4.2</version>
 <relativepath/> <!-- lookup parent from repository -->
 </parent>
 <groupid>springboot-web04</groupid>
 <artifactid>demo</artifactid>
 <version>0.0.1-snapshot</version>
 <name>demo</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-jdbc</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>
 <dependency>
 <groupid>org.springframework.boot</groupid>
 <artifactid>spring-boot-starter-test</artifactid>
 <scope>test</scope>
 </dependency>
<!--下面的都是我加的-->
 <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>org.mybatis.spring.boot</groupid>
 <artifactid>mybatis-spring-boot-starter</artifactid>
 <version>2.1.3</version>
 </dependency>

 <dependency>
 <groupid>mysql</groupid>
 <artifactid>mysql-connector-java</artifactid>
 </dependency>

 <dependency>
 <groupid>org.projectlombok</groupid>
 <artifactid>lombok</artifactid>
 <version>1.18.12</version>
 <scope>provided</scope>
 </dependency>

 <dependency>
 <groupid>com.alibaba</groupid>
 <artifactid>druid</artifactid>
 <version>1.2.1</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application.yml文件与pplication.properties文件

在resources目录下新建yml文件，用于存放数据库连接需要的一些数据

spring:
 datasource:
 driver-class-name: com.mysql.cj.jdbc.driver
 url: jdbc:mysql://localhost:3306/mybatis?servertimezone=gmt%2b8&usessl=true
 username: root //数据库
 password: sm1208 //密码

在application.properties文件中加入

#端口号
server.port=8080
#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下的新建类userlogin

package springbootweb04.demo.pojo;

import lombok.allargsconstructor;
import lombok.data;
import lombok.noargsconstructor;

@data
@allargsconstructor
@noargsconstructor

public class userlogin {
 private string username;
 private string password;

 public string getusername() {
 return username;
 }
}

2.5、新建数据库，名为mybatis，创建用户表，名为userlogin，创建username、password字段

2.5.1、数据库名可以随意，不过要与application.yml文件中的一致

2.5.2、idea中连接数据库

database——> +——> data source——> mysql

2.6、mapper层

新建userloginmapper接口

package springbootweb04.demo.mapper;

import org.apache.ibatis.annotations.mapper;
import org.springframework.stereotype.repository;
import springbootweb04.demo.pojo.userlogin;

import java.util.list;

@mapper
@repository
public interface userloginmapper {
 //查询
 public list<userlogin> queryall();
 //添加数据
 public int add(userlogin userlogin);
 //根据用户名查询数据
 public userlogin querybyname(string username);
}

2.7、resources目录下的mapper目录

在resources目录下新建mapper目录，并在这个目录下新建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="springbootweb04.demo.mapper.userloginmapper">
 <select id="queryall" resulttype="springbootweb04.demo.pojo.userlogin">
 select * from userlogin
 </select>

 <insert id="add" parametertype="springbootweb04.demo.pojo.userlogin">
 insert into userlogin values (#{username},#{password})
 </insert>

 <select id="querybyname" resulttype="springbootweb04.demo.pojo.userlogin">
 select * from userlogin where username = #{username}
 </select>

</mapper>

2.8、测试

在test.java.springbootweb04.demo类中，测试是否能联通数据库，没有报错说明成功。

package springbootweb04.demo;

import org.junit.jupiter.api.test;
import org.springframework.boot.test.context.springboottest;
import springbootweb04.demo.mapper.userloginmapper;
import springbootweb04.demo.pojo.userlogin;
import org.springframework.beans.factory.annotation.autowired;


import javax.sql.datasource;
import java.sql.connection;
import java.sql.sqlexception;
import java.util.list;

@springboottest
class demoapplicationtests {
 @autowired
 datasource datasource;
 @test
 void contextloads() throws sqlexception {
 system.out.println(datasource.getclass());
 connection connection = datasource.getconnection();
 system.out.println(connection);

 //template模板，拿来即用
 connection.close();
 }
 @autowired
 userloginmapper userloginmapper;
 @test
 public void totest(){
 list<userlogin> userlogins = userloginmapper.queryall();
 userlogins.foreach(e-> system.out.println(e));
 }
}

2.9、services层

在services下新建接口userloginservicesi和类userloginservicesimpl

userloginservicesi接口：

package springbootweb04.demo.services;

import springbootweb04.demo.pojo.userlogin;

import java.util.list;

public interface userloginservicesi {
 //查询
 public list<userlogin> queryall();
 //添加数据
 public int add(userlogin userlogin);
 //根据用户名查询数据
 public userlogin querybyname(string username);
}

userloginservicesimpl类

package springbootweb04.demo.services;

import springbootweb04.demo.mapper.userloginmapper;
import springbootweb04.demo.pojo.userlogin;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.service;

import java.util.list;

@service
public class userloginservicesimpl implements userloginservicesi {

 @autowired
 userloginmapper userloginmapper;
 @override
 public list<userlogin> queryall() {
 return userloginmapper.queryall();
 }

 @override
 public int add(userlogin userlogin) {
 return userloginmapper.add(userlogin);
 }

 @override
 public userlogin querybyname(string username) {
 return userloginmapper.querybyname(username);
 }
}

2.a、conteoller层

编写mycontroller类

package springbootweb04.demo.controller;

import springbootweb04.demo.pojo.userlogin;
import springbootweb04.demo.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 {
 @autowired
 userloginservicesimpl userloginservicesimpl;

 @requestmapping("/tologin")
 public string tologin(){
 return "login";
 }

 @requestmapping("/loginsuccess")
 public string loginsuccess(model model, userlogin userlogin){
 //先查询看该用户名是否存在
 userlogin userlogin1 = userloginservicesimpl.querybyname(userlogin.getusername());
 if(userlogin1 != null){ // 如果查询的用户不为空
 system.out.println(userlogin1.tostring());
 return "success";
 }
 else{
 //返回到登录页面
 model.addattribute("data","该用户不存在，请先注册");
 return "login";
 }
 }
 //登录界面
 @requestmapping("/toregister")
 public string toregister(){
 return "register";
 }
 @requestmapping("/registersuccess")
 public string toregistersuccess(model model,userlogin userlogin){
 //将账号密码加入到数据库中
 int add = userloginservicesimpl.add(userlogin);
 system.out.println("数据插入成功！");
 model.addattribute("data","注册成功，请登录！");
 return "login";
 }
}

三、编写前端页面

将以下三个页面放在templates下面

login.html：登录页面

<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="utf-8">
 <title>title</title>
</head>
<body style="background: aqua">
<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>

register.html:注册页面

<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="utf-8">
 <title>title</title>
</head>
<body style="background: aqua">
<div align="center">
 <br><br>注册界面<br><br>
 <form method="get" action="/registersuccess">
 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：成功界面

<!doctype html>
<html lang="en">
<head>
 <meta charset="utf-8">
 <title>title</title>
</head>
<body>

</body>
</html>

四、运行测试

:localhost:8080/tologin

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