springmvc+mybatis+sql server实现简单登录功能

以下全是从网上copy下来的代码，具体网址忘了

Users.java

package com.login.entity;

import java.io.Serializable;

public class Users implements Serializable {
  /**
   * 
   */
  private static final long serialVersionUID = 1L;
  private Integer id;
  private String username;
  private String password;

  public Users() {
    super();
  }

  public Users(Integer id, String username, String password) {
    super();
    this.id = id;
    this.username = username;
    this.password = password;
  }

  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;
  }

}

UsersController.java

package com.login.controller;


import java.util.HashMap;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.login.entity.Users;
import com.login.service.UsersService;
import com.login.util.MD5Util;

@Controller
@RequestMapping("/")
public class UsersController {

  protected final Log logger = LogFactory.getLog(getClass());

  @Resource
  private UsersService usersService;
  
  @RequestMapping("main")
  public String main() {
    return "main";
  }

  @RequestMapping("login")
  public String login() {
    
      return "login";
    
    /*HashMap<String, Object> users = new HashMap<String, Object>();
    users.put("username",username.trim());
    users.put("password",MD5Util.string2MD5(password.trim()));
    Users one=usersService.getUserByUsernameAndPassword(users);
    HttpSession session = request.getSession();
    session.setAttribute("one",one);
    if(one==null){
      model.addAttribute("error","用户名或密码错误！");
      return "login";
    }else{
      return "redirect:/main";
    }*/
  }
  
  @RequestMapping("adminis")
  public String adminis(@Param("username") String username,@Param("password") String password,HttpServletRequest request,Model model) {
    HttpSession session = request.getSession();
    session.setAttribute("username",username);
    session.setAttribute("password",password);
    if(username==null||username==""){
      model.addAttribute("error","用户名不能为空！");
      return "login";
    }else if(password==null||password==""){
      model.addAttribute("error","密码不能为空！");
      return "logins";
    }
    HashMap<String, Object> users = new HashMap<String, Object>();
    users.put("username",username.trim());
    users.put("password",MD5Util.string2MD5(password.trim()));
    Users user=usersService.getUserByUsernameAndPassword(users);
    
    session.setAttribute("user",user);
    if(user==null){
      model.addAttribute("error","用户名或密码错误！");
      return "logins";
    }else{
      return "redirect:/admin";
    }
  }
  
  @RequestMapping("admin")
  public String admin() {
    return "main";
  }
  
  @RequestMapping("logout")
  public String logout(HttpServletRequest request) {
    request.getSession().removeAttribute("user");
    request.getSession().invalidate();
    return "login";
  }
}

UsersService.java

package com.login.service;

import java.util.ArrayList;
import java.util.Map;

import com.login.entity.Users;

public interface UsersService {
  
  /**
   * 添加用户信息
   * @param param
   */
  public void insertUsers(Map<String, Object> param);
  
  /**
   * 删除用户信息
   * @param id
   */
  public void deleteUsers(int id);
  
  /**
   * 修改用户信息
   * @param param
   */
  public void updateUsers(Map<String, Object> param);
  
  /**
   * 查询用户信息(后台)
   * @return List<Users>
   */
  public ArrayList<Users> searchUsers();
  
  /**
   * 根据用户名称查询用户信息(后台)
   * @return List<Users>
   */
  public ArrayList<Users> searchUsersByUsername(String username);
  
  /**
   * 根据编号查询用户信息
   * @param id
   * @return Users
   */
  public Users searchUsersById(int id);
  
  /**
   * 根据用户名和密码查询用户是否存在
   * @param param
   * @return Users
   */
  public Users getUserByUsernameAndPassword(Map<String, Object> param);
}

UsersServiceImpl.java

package com.login.service.impl;

import java.util.ArrayList;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.login.entity.Users;
import com.login.mapper.UsersMapper;
import com.login.service.UsersService;

@Service
@Transactional
// @Transactional表示该类被Spring作为管理事务的类
public class UsersServiceImpl implements UsersService {

  @Resource
  private UsersMapper usersMapper;

  /**
   * 添加用户信息
   * 
   * @param param
   */
  @Override
  public void insertUsers(Map<String, Object> param) {
    usersMapper.insertUsers(param);
  }

  /**
   * 删除用户信息
   * 
   * @param id
   */
  @Override
  public void deleteUsers(int id) {
    usersMapper.deleteUsers(id);
  }

  /**
   * 修改用户信息
   * 
   * @param param
   */
  @Override
  public void updateUsers(Map<String, Object> param) {
    usersMapper.updateUsers(param);
  }

  /**
   * 查询用户信息(后台)
   * 
   * @return List<Users>
   */
  @Override
  public ArrayList<Users> searchUsers() {
    return usersMapper.searchUsers();
  }

  /**
   * 根据用户名称查询用户信息(后台)
   * 
   * @return List<Users>
   */
  @Override
  public ArrayList<Users> searchUsersByUsername(String username) {
    return usersMapper.searchUsersByUsername(username);
  }

  /**
   * 根据编号查询用户信息
   * 
   * @param id
   * @return Users
   */
  @Override
  public Users searchUsersById(int id) {
    return usersMapper.searchUsersById(id);
  }

  /**
   * 根据用户名和密码查询用户是否存在
   * 
   * @param param
   * @return Users
   */
  public Users getUserByUsernameAndPassword(Map<String, Object> param) {
    return usersMapper.getUserByUsernameAndPassword(param);
  }
}

UsersMapper.java

package com.login.mapper;

import java.util.ArrayList;
import java.util.Map;

import com.login.entity.Users;

public interface UsersMapper {

  /**
   * 添加用户信息
   * 
   * @param param
   */
  public void insertUsers(Map<String, Object> param);

  /**
   * 删除用户信息
   * 
   * @param id
   */
  public void deleteUsers(int id);

  /**
   * 修改用户信息
   * 
   * @param param
   */
  public void updateUsers(Map<String, Object> param);

  /**
   * 查询用户信息(后台)
   * 
   * @return ArrayList<Users>
   */
  public ArrayList<Users> searchUsers();

  /**
   * 根据用户名称查询用户信息(后台)
   * 
   * @return ArrayList<Users>
   */
  public ArrayList<Users> searchUsersByUsername(String username);

  /**
   * 根据编号查询用户信息
   * 
   * @param id
   * @return Users
   */
  public Users searchUsersById(int id);

  /**
   * 根据用户名和密码查询用户是否存在
   * 
   * @param param
   * @return Users
   */
  public Users getUserByUsernameAndPassword(Map<String, Object> param);

}

UsersMapper.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.login.mapper.UsersMapper">
  
  <insert id="insertUsers" parameterType="java.util.Map">
    INSERT INTO tbl_Users ([username],[password]) VALUES (#{username},#{password})
    <selectKey keyProperty="id" resultType="int" order="AFTER">
            select @@identity
        </selectKey>
  </insert>
  
  <select id="deleteUsers" parameterType="java.lang.Integer">
    delete from tbl_Users where id = #{id}
  </select>
  
  <update id="updateUsers" parameterType="com.login.entity.Users" statementType="PREPARED">
    update tbl_Users
    <set>
      <if test="username != null">username = #{username},</if>
      <if test="password != null">password = #{password},</if>
    </set>
    where id = #{id}
  </update>
  
  <select id="searchUsers" parameterType="java.util.Map" resultType="com.login.entity.Users">
    select * from tbl_Users
  </select>
  
  <select id="searchUsersByUsername" parameterType="java.lang.String" resultType="com.login.entity.Users">
    select * from tbl_Users where username like '%${_parameter}%'
  </select>
  
  <select id="searchUsersById" parameterType="java.lang.Integer" resultType="com.login.entity.Users">
    select * from tbl_Users where id = #{id}
  </select>
  
  <select id="getUserByUsernameAndPassword" parameterType="java.util.Map" resultType="com.login.entity.Users">
    select * from tbl_Users where username=#{username} and password=#{password} 
  </select>
</mapper>

jdbc.properties

jdbc_driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
jdbc_url=jdbc:sqlserver://127.0.0.1:1433;DatabaseName=policestation
jdbc_username=sa
jdbc_password=systemadmin

applicationContext.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:context="http://www.springframework.org/schema/context"
  xmlns:p="http://www.springframework.org/schema/p"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xmlns:tx="http://www.springframework.org/schema/tx"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
  http://www.springframework.org/schema/tx 
  	http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
  http://www.springframework.org/schema/aop 
  	http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
  	http://www.springframework.org/schema/context
  	http://www.springframework.org/schema/context/spring-context-3.0.xsd">

  <!-- 引入jdbc配置文件 -->    
    <context:property-placeholder location="config/jdbc.properties" />

  <!--配制数据源-->
  <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="${jdbc_driver}"></property>
    <property name="url" value="${jdbc_url}"></property>
    <property name="username" value="${jdbc_username}"></property>
    <property name="password" value="${jdbc_password}"></property>
  </bean>
  
  <!-- 创建sqlSessionFactory，同时指定数据源 -->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="configLocation" value="/WEB-INF/mybatis-config.xml"/>
    <!-- 自动扫描mapper目录, 省掉mybatis-config.xml里的手工配置 -->
    <property name="mapperLocations">
      <list>
        <value>classpath:com/login/mapper/*.xml</value>
      </list>
    </property>
  </bean>
  
   <!-- 通过扫描的模式，扫描目录在com/login/mapper目录下 -->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.login.mapper" />
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
  </bean>
  
  <!-- (事务管理)-->
  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
  </bean>
  <!-- 使用annotation定义数据库事务，这样可以在类或方法中直接使用@Transactional注解来声明事务 -->
  <tx:annotation-driven transaction-manager="transactionManager" />
  
  <tx:advice id="txAdvice" transaction-manager="transactionManager">
    <tx:attributes>
      <tx:method name="insert*" propagation="REQUIRED" />
      <tx:method name="delete*" propagation="REQUIRED" />
      <tx:method name="update*" propagation="REQUIRED" />
      <tx:method name="approve" propagation="REQUIRED" />
      <tx:method name="undo" propagation="REQUIRED" />
      <tx:method name="load*" propagation="SUPPORTS" read-only="true" />
      <tx:method name="get*" propagation="SUPPORTS" read-only="true" />
      <tx:method name="search*" propagation="SUPPORTS" read-only="true" />
      <tx:method name="*" propagation="SUPPORTS" read-only="true" />
    </tx:attributes>
  </tx:advice>

  <aop:config>
    <aop:pointcut id="serviceMethod" expression="execution(* com.login.service.*.*(..))" />
    <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethod" />
  </aop:config>
  

  <!-- 自动搜索注解路径-->
    <context:component-scan base-package="com.login"></context:component-scan>
</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>
  
  <!--整合Spring的时候 只有 settings typeAliases mapper 三个属性有用, 其余的要在spring总配置文件中会覆盖 -->
  <settings>
    <!-- 全局映射器，是否启用缓存 -->
    <setting name="cacheEnabled" value="false" />
    <!-- 查询时，关闭关联对象即时加载以提高性能 -->
    <!-- 设置关联对象加载的形态，此处为按需加载字段(加载字段由SQL指 定)，不会加载关联表的所有字段，以提高性能 -->
    <setting name="aggressiveLazyLoading" value="false" />
    <!-- 对于未知的SQL查询，允许返回不同的结果集以达到通用的效果 -->
    <setting name="multipleResultSetsEnabled" value="true" />
    <!-- 允许使用列标签代替列名 -->
    <setting name="useColumnLabel" value="true" />
    <!-- 允许使用自定义的主键值(比如由程序生成的UUID 32位编码作为键值)，数据表的PK生成策略将被覆盖 -->
    <setting name="useGeneratedKeys" value="true" />
    <!-- 给予被嵌套的resultMap以字段-属性的映射支持 -->
    <setting name="autoMappingBehavior" value="FULL" />
    <!-- 对于批量更新操作缓存SQL以提高性能 -->
    <setting name="defaultExecutorType" value="BATCH" />
    <!-- 数据库超过25000秒仍未响应则超时 -->
    <setting name="defaultStatementTimeout" value="25000" />
  </settings>
  
</configuration>

spring-servlet.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:mvc="http://www.springframework.org/schema/mvc"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    	http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    	http://www.springframework.org/schema/context
    	http://www.springframework.org/schema/context/spring-context-4.0.xsd
    	http://www.springframework.org/schema/mvc
    	http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    	
  <!-- 自动扫描的包名 -->
  <context:component-scan base-package="com.login.controller"/>
    
  <!-- 默认的注解映射的支持 -->
    <mvc:annotation-driven />

    <!-- 静态资源映射 -->
  <mvc:resources mapping="/css/**" location="/WEB-INF/view/css/" cache-period="31556926"/>
  <mvc:resources mapping="/images/**" location="/WEB-INF/view/images/" cache-period="31556926"/>
  <mvc:resources mapping="/img/**" location="/WEB-INF/view/img/" cache-period="31556926"/>
  <mvc:resources mapping="/js/**" location="/WEB-INF/view/js/" cache-period="31556926"/>
  <mvc:resources mapping="/m_css/**" location="/WEB-INF/view/manager/css/" cache-period="31556926"/>
  <mvc:resources mapping="/m_images/**" location="/WEB-INF/view/manager/images/" cache-period="31556926"/>
  <mvc:resources mapping="/datePicker/**" location="/WEB-INF/view/manager/My97DatePicker/" cache-period="31556926"/>
  <mvc:resources mapping="/dtree/**" location="/WEB-INF/view/dtree/" cache-period="31556926"/>
  <mvc:resources mapping="/ztree/**" location="/WEB-INF/view/zTree_v3/" cache-period="31556926"/>
  <mvc:resources mapping="/FCKeditor/**" location="/FCKeditor/" cache-period="31556926"/>
  <mvc:resources mapping="/UserFiles/**" location="/UserFiles/" cache-period="31556926"/>
  <mvc:resources mapping="/upload/**" location="/upload/" cache-period="31556926"/>
  <mvc:resources mapping="/uploadFriendly/**" location="/uploadFriendly/" cache-period="31556926"/>
  <mvc:resources mapping="/uploadAdvert/**" location="/uploadAdvert/" cache-period="31556926"/>
  <mvc:resources mapping="/uploadNotice/**" location="/uploadNotice/" cache-period="31556926"/>
  <mvc:resources mapping="/tool/**" location="/tool/" cache-period="31556926"/>
  <mvc:resources mapping="/loginImg/**" location="/WEB-INF/view/manager/login/images/" cache-period="31556926"/>
  
  <!-- 对模型视图添加前后缀 -->
  <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/" />
    <property name="suffix" value=".jsp" />
  </bean>	

    <!-- file upload -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="-1" /><!-- 字节单位 -->
        <property name="maxInMemorySize" value="2048" /><!-- 2M -->
        <property name="defaultEncoding" value="UTF-8" />
    </bean>

</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>错误跳转页面</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <display-name>session销毁时间(分钟)</display-name>
  <session-config>
    <session-timeout>30</session-timeout>
  </session-config>
  <listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
  </listener>
  <servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>*.html</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <display-name>Spring字符集过滤器</display-name>
  <filter>
    <filter-name>encoding</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>encoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">    
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->
  </head>
  
  <body>
    This is my JSP page. <br>
  <a href="login.html">管理登录</a>
  </body>
</html>

login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="com.login.entity.Users"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>用户登录</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style>
body{margin:0; padding:0; font-size:9pt;}
#login{margin:auto; width:975px; height:368px; margin-top:120px;}
#top_left{width:691px; height:89px; float:left;}
#top_left img {margin-left:33px;}
#top_center{width:248px; height:89px; background:url(loginImg/login_05.gif); float:left;}

#center_left{width:691px; height:190px; background:url(loginImg/login_09.jpg); float:left;}
#center_middle{width:248px; height:190px; float:left; background:url(loginImg/login_13.gif) repeat-y;}
#center_right{width:36px; height:190px; float:right; background:url(loginImg/login_11.gif);}

#down_left{width:691px; height:89px; float:left; margin-top:15px;}
#down_center{width:248px; height:89px; background:url(loginImg/login_16.gif); float:left;}
#inf{width:691px; height:38px; background:url(loginImg/login_18.gif) no-repeat; }
.inf_text{display:block; width:100px; height:20px; font-size:16px; font-weight:bolder; color:#fff; margin-left:17px; margin-top:12px; float:left;}
.copyright{display:block; float:left; margin-left:17px; margin-top:15px;}

#message{text-align:center;color:red;}
#user{ margin-left:40px; margin-top:15px;}
#password{margin-left:40px; margin-top:25px; height:25px;}
input{width:120px; height:18px; border:solid 1px #aca7a7; font-size:9pt;}
#btn{margin-left:30px; margin-top:40px;height:25px; margin-right:28px; text-align:center;}
#btn a{display:block; line-height:25px; background: url(loginImg/bt_bg.gif); border: solid 1px #b6b6b6; width:65px; float:left; margin-left:15px; text-decoration:none; color:#000;}
#btn input{display:block;height:25px; line-height:22px; background: url(loginImg/bt_bg.gif); border: solid 1px #b6b6b6; width:65px; float:left; margin-left:2px; text-decoration:none; color:#000;}
</style>
<script type="text/javascript">
function show(){  
    if(document.getElementById("name").value==""){
      document.getElementById("showname").innerHTML="用户名不能为空！";
      document.getElementById("name").focus();
      return false;
    }else if(document.getElementById("pwd").value==""){
        document.getElementById("showname").innerHTML="密码不能为空！";
      document.getElementById("pwd").focus();
      return false;
    }else{
        return true;
    }
</script>
</head>
<body>
  <form action="adminis.html" method="post" name="myform">
  <div id="login">
    <div id="top">
      <div id="top_left"><img src="loginImg/login_03.gif"/></div>
      <div id="top_center"></div>
    </div>	
    <div id="center">
      <div id="center_left"></div>
      <div id="center_middle">
        <div id="message">${error}<span id="showname" style="display:inline;"></span></div>
        <div id="user">用  户：<input type="text" name="username" onblur="show()" id="name"/></div>
        <div id="password">密  码：<input type="password" name="password" onblur="show()" id="pwd"/></div>
        <div id="btn"><a href="javascript:document.myform.submit();">登  录</a><a href="javascript:document.myform.reset();">清  空</a></div>
     		</div>
      <div id="center_right"></div>		 
    </div>
    <div id="down">
      <div id="down_left">
        <div id="inf"><span class="inf_text">版本信息</span><span class="copyright">信息管理系统 2015 v1.0</span><span class="copyright" style="color:red;">请在IE10以下版本中使用后台功能</span></div>
      </div>
      <div id="down_center"></div>		 
    </div>
  </div>
  </form>
</body>
</html>

logins.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="com.login.entity.Users"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>用户登录</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style>
body{margin:0; padding:0; font-size:9pt;}
#login{margin:auto; width:975px; height:368px; margin-top:120px;}
#top_left{width:691px; height:89px; float:left;}
#top_left img {margin-left:33px;}
#top_center{width:248px; height:89px; background:url(loginImg/login_05.gif); float:left;}

#center_left{width:691px; height:190px; background:url(loginImg/login_09.jpg); float:left;}
#center_middle{width:248px; height:190px; float:left; background:url(loginImg/login_13.gif) repeat-y;}
#center_right{width:36px; height:190px; float:right; background:url(loginImg/login_11.gif);}

#down_left{width:691px; height:89px; float:left; margin-top:15px;}
#down_center{width:248px; height:89px; background:url(loginImg/login_16.gif); float:left;}
#inf{width:691px; height:38px; background:url(loginImg/login_18.gif) no-repeat; }
.inf_text{display:block; width:100px; height:20px; font-size:16px; font-weight:bolder; color:#fff; margin-left:17px; margin-top:12px; float:left;}
.copyright{display:block; float:left; margin-left:17px; margin-top:15px;}

#message{text-align:center;color:red;}
#user{ margin-left:40px; margin-top:15px;}
#password{margin-left:40px; margin-top:25px; height:25px;}
input{width:120px; height:18px; border:solid 1px #aca7a7; font-size:9pt;}
#btn{margin-left:30px; margin-top:40px;height:25px; margin-right:28px; text-align:center;}
#btn a{display:block; line-height:25px; background: url(loginImg/bt_bg.gif); border: solid 1px #b6b6b6; width:65px; float:left; margin-left:15px; text-decoration:none; color:#000;}
#btn input{display:block;height:25px; line-height:22px; background: url(loginImg/bt_bg.gif); border: solid 1px #b6b6b6; width:65px; float:left; margin-left:2px; text-decoration:none; color:#000;}
</style>
<script type="text/javascript">
function show(){  
    if(document.getElementById("name").value==""){
      document.getElementById("showname").innerHTML="用户名不能为空！";
      document.getElementById("name").focus();
      return false;
    }else if(document.getElementById("pwd").value==""){
        document.getElementById("showname").innerHTML="密码不能为空！";
      document.getElementById("pwd").focus();
      return false;
    }else{
        return true;
    }
    
</script>
</head>
<body>
  <form action="adminis.html" method="post" name="myform">
  <div id="login">
    <div id="top">
      <div id="top_left"><img src="loginImg/login_03.gif"/></div>
      <div id="top_center"></div>
    </div>	
    <div id="center">
      <div id="center_left"></div>
      <div id="center_middle">
        <div id="message">${error}<span id="showname" style="display:inline;"></span></div>
        <div id="user">用  户：<input type="text" name="username" value="<%=(String)session.getAttribute("username") %>" onblur="show()" id="name"/></div>
        <div id="password">密  码：<input type="password" name="password" value="<%=(String)session.getAttribute("password") %>" onblur="show()" id="pwd"/></div>
        <div id="btn"><a href="javascript:document.myform.submit();">登  录</a><a href="login.html">清  空</a></div>
     		</div>
      <div id="center_right"></div>		 
    </div>
    <div id="down">
      <div id="down_left">
        <div id="inf"><span class="inf_text">版本信息</span><span class="copyright">信息管理系统 2015 v1.0</span><span class="copyright" style="color:red;">请在IE10以下版本中使用后台功能</span></div>
      </div>
      <div id="down_center"></div>		 
    </div>
  </div>
  </form>
</body>
</html>

main.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="com.login.entity.Users"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<%
  Users user=(Users)session.getAttribute("user");
%>
  <head>
  
    
    <title>My JSP 'index.jsp' starting page</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">    
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->
  </head>
  
  <body>
    This is my JSP page. <br>
    欢迎您<%=user.getUsername() %>
  </body>
</html>

lib下项目支持的驱动包(以下是需要的jar包，文件太大，无法上传请看图片，按照下面的版本下载就可以。)

需要的数据库文件可自行设计建库。