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.SQLServerDriverjdbc_url=jdbc:sqlserver://127.0.0.1:1433;DatabaseName=policestationjdbc_username=sajdbc_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。