使用环境：MyEclipse/Eclipse + Tomcat + MySql。

使用技术：SpringMVC + Spring + Mybatis。


实现效果

登录页面：

SpringMVC+Spring+Mybatis实现登录注册Demo_spring

密码错误提示

SpringMVC+Spring+Mybatis实现登录注册Demo_java_02

登录成功后

SpringMVC+Spring+Mybatis实现登录注册Demo_java_03

注册

SpringMVC+Spring+Mybatis实现登录注册Demo_web.xml_04

注册成功

SpringMVC+Spring+Mybatis实现登录注册Demo_web.xml_05

目录结构

SpringMVC+Spring+Mybatis实现登录注册Demo_web.xml_06

一、配置文件

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/jee
        http://www.springframework.org/schema/jee/spring-jee.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 自动扫描 -->
    <context:component-scan base-package="com.java.dao"></context:component-scan>  
    <context:component-scan base-package="com.java.service"></context:component-scan>  
    <context:component-scan base-package="com.java.serviceimpl"></context:component-scan>

  <!-- 配置mysql连接 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <context:property-placeholder location="classpath:/jdbc.properties"/>

   <!-- 配置mybatis的SQLSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
      <property name="dataSource" ref="dataSource"></property>
      <!-- 自动扫描mappers.xml文件 -->
      <property name="mapperLocations" value="classpath:com/java/mappers/*.xml"></property>
      <!-- mybatis配置文件 -->
      <property name="configLocation" value="classpath:mybatis-config.xml "></property>
    </bean>

  <!-- spring自动查找其下的类 -->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.java.dao"></property>
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
  </bean>  

</beans>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 对entity下的实体类起个别名，起到简化的作用 -->
    <typeAliases>
      <package name="com.java.entity"></package>
    </typeAliases>
</configuration>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/jee
        http://www.springframework.org/schema/jee/spring-jee.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

        <!-- 使用注解的包，包括子集    --> 
    <context:component-scan base-package="com.java.controller"/>

        <!-- 视图解析器 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp" />
    </bean>

</beans>

jdbc.properties

jdbc.driverClassName=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_student?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC
jdbc.username=root
jdbc.password=root

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
          http://www.springmodules.org/schema/cache/springmodules-cache.xsd
          http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd" 
     xmlns="http://java.sun.com/xml/ns/javaee"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     id="WebApp_ID" version="2.5">

  <display-name>mybatis06-spring-springmvc</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

<!-- 对spring的支持   -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:beans.xml</param-value>
  </context-param>
      <!-- 过滤器 -->
  <filter> 
       <filter-name>characterEncodingFilter</filter-name> 
       <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 
       <init-param> 
           <param-name>encoding</param-name> 
           <param-value>UTF-8</param-value> 
       </init-param> 
       <init-param> 
           <param-name>forceEncoding</param-name> 
           <param-value>true</param-value> 
       </init-param> 
   </filter> 
   <filter-mapping> 
       <filter-name>characterEncodingFilter</filter-name> 
       <url-pattern>/*</url-pattern> 
   </filter-mapping> 

    <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

<!-- 对springmvc的支持   -->
    <servlet>
    <servlet-name >springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>

    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>


</web-app>

二、Java代码

1、com.java.entity

User.java

package com.java.entity;

public class User {

  private Integer id;
  private String userName;
  private String passWord;

  // 无参构造
  public User() {
    super();
  }

  // 全参构造
  public User(String userName, String passWord) {
    super();
    this.userName = userName;
    this.passWord = passWord;
  }

  //get、set方法
  public Integer getId() {
    return id;
  }
  public void setId(Integer id) {
    this.id = id;
  }
  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;
  }

  // toString方法
  @Override
  public String toString() {
    return "User [id=" + id + ", userName=" + userName + ", passWord=" + passWord + "]";
  }


}

2、com.java.dao

UserDao.java

package com.java.dao;

import com.java.entity.User;

public interface UserDao {

  public User login(User user);

  public User add(User user);

}

3、com.java.mappers

user.xml

<?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.java.dao.UserDao">

  <resultMap type="com.java.entity.User" id="UserResult">
    <id property="id" column="id"></id>
    <result property="userName" column="userName"></result>
    <result property="passWord" column="passWord"></result>
  </resultMap>

  <select id="login" parameterType="com.java.entity.User" resultMap="UserResult">
    select * from user where userName=#{userName} and passWord=#{passWord}
  </select>

  <select id="add" parameterType="com.java.entity.User" resultMap="UserResult">
    insert into user (userName,passWord) values(#{userName},#{passWord})
  </select>

</mapper>

4、com.java.controller

UserController.java

package com.java.controller;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.java.entity.User;
import com.java.service.UserService;

@Controller
@RequestMapping("/user")
public class UserController {

  @Resource
  private UserService userService;

  @RequestMapping("/login")
  public String login(User user,HttpServletRequest request) {
    User resultUser=userService.login(user);
    System.out.println(resultUser);
    if(resultUser==null) {
      request.setAttribute("user", user);
      request.setAttribute("errorMsg", "用户名或密码错误！");
      return "index";
    }else {
      HttpSession session=request.getSession();
      session.setAttribute("currentUser", resultUser);
      return "welcome";
    }
  }

  @RequestMapping("/add")
  public String add(HttpServletRequest request,HttpServletResponse response){
    response.setContentType("text/html");
    response.setCharacterEncoding("UTF-8");
    String username=request.getParameter("userName");
    String password=request.getParameter("passWord");
    User users=new User(username, password);
    userService.add(users);
    return "reback";
  }

}

5、com.java.service

UserService.java

package com.java.service;

import com.java.entity.User;

public interface UserService {

  public User login(User user);

  public User add(User user);
}

6、com.java.serviceimpl

ServiceImpl.java

package com.java.serviceimpl;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.java.dao.UserDao;
import com.java.entity.User;
import com.java.service.UserService;

@Service("userService")
public class ServiceImpl implements UserService{

  @Resource
  private UserDao userDao;

  public User login(User user) {
    return userDao.login(user);
  }

  public User add(User user) {
    return userDao.add(user);
  }

}

三、Jsp页面代码

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>用户登录页面</title>
</head>
<body>
<a href="add.jsp">注册</a>&nbsp;<br/>
<form action="${pageContext.request.contextPath}/user/login.do" method="post">
    userName:<input type="text" name="userName" value="${userName}"/><br/>
    passWord:<input type="password" name="passWord" value="${passWord}"/><br/>
    <input type="submit" value="登录"/><br/>
    <font color="red">${errorMsg}</font>
</form>
</body>
</html>

welcome.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录成功</title>
</head>
<body>
欢迎   ${currentUser.userName} 来到我们的世界！
</body>
</html>

reback.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录成功</title>
<script>
    function fun(){
        alert("确认返回登录页面");
/*      location.href ="http://localhost:8080/mybatis06-spring-springmvc/index.jsp";
 */     
        window.history.go(-2);
    }

</script>
</head>
<body>
<input type="button" value="注册成功，返回登录页面" onclick="fun()"/>

</body>
</html>

add.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/user/add.do" method="post">
    userName:<input type="text" name="userName"/>
    passWord:<input type="password" name="passWord"><br/>
    <input type="submit" value="注册" />
</form>
</body>
</html>