springMVC利用HandlerInterceptor实现简单登录注销功能及表单处理

其他 2018-05-06 22:44:44 阅读次数: 4

一、项目结构及依赖包

二、建库

-- phpMyAdmin SQL Dump
-- version 4.6.4
-- https://www.phpmyadmin.net/
--
-- Host: localhost
-- Generation Time: 2017-12-27 13:44:25
-- 服务器版本： 5.7.14
-- PHP Version: 5.6.26

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Database: `test`
--

-- --------------------------------------------------------

--
-- 表的结构 `t_user`
--

CREATE TABLE `t_user` (
  `userId` int(11) NOT NULL,
  `userName` varchar(20) DEFAULT NULL,
  `password` varchar(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

--
-- 转存表中的数据 `t_user`
--

INSERT INTO `t_user` (`userId`, `userName`, `password`) VALUES
(1, 'wxw1', '123'),
(3, 'wxw3', '123'),
(4, 'wxw4', '4444'),
(8, 'wxw8', '1234'),
(2, '王弈伟', '123');

--
-- Indexes for dumped tables
--

--
-- Indexes for table `t_user`
--
ALTER TABLE `t_user`
  ADD PRIMARY KEY (`userId`),
  ADD UNIQUE KEY `userName` (`userName`,`password`);

--
-- 在导出的表使用AUTO_INCREMENT
--

--
-- 使用表AUTO_INCREMENT `t_user`
--
ALTER TABLE `t_user`
  MODIFY `userId` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=9;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

三、DAO实现

只贴代码不做解释，不清楚的请移步Spring 的持久化实例和Spring Mybatis实例SqlSessionDaoSupport混用xml配置和注解。

实体pojo

package test.SpringMVC.model;

public class TUser {
	
	private long userId;
	private String userName;
	private String password;
	public long getUserId() {
		return userId;
	}
	public void setUserId(long userId) {
		this.userId = userId;
	}
	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;
	}
	@Override
	public String toString() {
		return "TUser [userId=" + userId + ", userName=" + userName + ", password=" + password + "]";
	}

}

接口

package test.SpringMVC.dao;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import test.SpringMVC.model.TUser;

public interface ITUserDao {
    @Select("select * from t_user")
	public List<TUser> listAll();
    @Select("select * from t_user where userId=#{userId}")
	public TUser getById(long userId);
    @Insert("insert into t_user(userId,userName,password) values(#{userId}, #{userName}, #{password})")
	public int insert(TUser u);
    @Update("update t_user set userName=#{userName},password=#{password} where userId=#{userId}")
	public int update(TUser u);
	@Delete("delete from t_user where userId=#{userId}")
	public int deleteById(long userId);
    @Select("delete from t_user")
    public void delAllUser();
    @Select("select * from t_user  where userName=#{userName} and password=#{password}")
	public TUser CheckLoginAndPwd(@Param("userName") String userName,@Param("password") String password);

}

接口实现：

package test.SpringMVC.daoimpl;

import java.util.List;

import org.mybatis.spring.support.SqlSessionDaoSupport;

import test.SpringMVC.dao.ITUserDao;
import test.SpringMVC.model.TUser;

public class TUserDaoImpl extends SqlSessionDaoSupport implements ITUserDao {

	@Override
	public List<TUser> listAll() {
		// TODO 自动生成的方法存根
		return this.getSqlSession().getMapper(ITUserDao.class).listAll();
	}

	@Override
	public TUser getById(long userId) {
		// TODO 自动生成的方法存根
		return this.getSqlSession().getMapper(ITUserDao.class).getById(userId);
	}

	@Override
	public int insert(TUser u) {
		// TODO 自动生成的方法存根
		return this.getSqlSession().getMapper(ITUserDao.class).insert(u);
	}

	@Override
	public int update(TUser u) {
		// TODO 自动生成的方法存根
		return this.getSqlSession().getMapper(ITUserDao.class).update(u);
	}

	@Override
	public int deleteById(long userId) {
		// TODO 自动生成的方法存根
		return this.getSqlSession().getMapper(ITUserDao.class).deleteById(userId);
	}

	@Override
	public TUser CheckLoginAndPwd(String userName, String password) {
		// TODO 自动生成的方法存根
		return this.getSqlSession().getMapper(ITUserDao.class).CheckLoginAndPwd(userName, password);
	}

	@Override
	public void delAllUser() {
		// TODO 自动生成的方法存根
		this.getSqlSession().getMapper(ITUserDao.class).delAllUser();
	}

}

四、配置文件

web.xml配置了首页index.jsp,其它的请求都被spring拦截

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	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>spring mvc</display-name>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>


	<!--configure the setting of springmvcDispatcherServlet and configure the 
		mapping -->
	<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-servlet.xml</param-value>
		</init-param>
		<!-- <load-on-startup>1</load-on-startup> -->
	</servlet>

	<servlet-mapping>
		<servlet-name>springmvc</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

</web-app>

springmvc-servlet.xml配置了数据源、mybatis配置文件路径、静态资源放行，需要说明的是拦截器Myinterceptor实现了HandlerInterceptor接口，其中postHandle对未处于登录状态的请求进行拦截，强制跳转到登录页面user/Login.jsp,后面给出代码。

<?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:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">                    
 
    <!-- scan the package and the sub package -->
    <context:component-scan base-package="test.SpringMVC"/>
 

	<!-- 解除servlet对静态资源文件访问的限制，使得静态资源先经过 -->
<!-- 	<mvc:default-servlet-handler />
 -->
     <mvc:resources mapping="/js/**" location="/js/"/>
     <mvc:resources mapping="/css/**" location="/css/"/>

    <!-- if you use annotation you must configure following setting -->
    <mvc:annotation-driven />
    
    <!-- 拦截器 -->
	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/**"/>
			<mvc:exclude-mapping path="/**/*.js"/>
			<mvc:exclude-mapping path="/**/*.css"/>
			<bean class="test.SpringMVC.controller.Myinterceptor"></bean>
		</mvc:interceptor>
	</mvc:interceptors>
	
    <!-- configure the InternalResourceViewResolver -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
            id="internalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/" />
        <!-- 后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>
 
   
   <bean id="dataSource1" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">        
    	<property name="driverClassName" value="com.mysql.jdbc.Driver" />       
    	<property name="url" value="jdbc:mysql://localhost:3306/test?useSSL=false" />       
    	<property name="username" value="your-user" />       
    	<property name="password" value="your-passwd" />       
   </bean>
   
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource1" />
		<property name="configLocation"
			value="classpath:test/SpringMVC/dao/mybatis-cfg.xml" />
	</bean>
	<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
		<constructor-arg ref="sqlSessionFactory" />
	</bean>
		<bean id="TUserDao" class="test.SpringMVC.daoimpl.TUserDaoImpl">
		<property name="sqlSessionTemplate" ref="sqlSession" />
	</bean>
	 	
</beans>

mybatis配置mybatis-cfg.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>
	<typeAliases>
		<typeAlias alias="TUser" type="test.SpringMVC.model.TUser" />
	</typeAliases>
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://127.0.0.1:3306/test?useSSL=false" />
				<property name="username" value="your-user" />
				<property name="password" value="your-passwd" />
			</dataSource>
		</environment>
	</environments>

	<mappers>
 		<!--接口的方式  注册接口-->
       	<mapper class="test.SpringMVC.dao.ITUserDao"/>
    </mappers>

	
</configuration>

五、控制器

package test.SpringMVC.controller;

import java.util.List;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import test.SpringMVC.dao.ITUserDao;
import test.SpringMVC.model.TUser;

@RestController
@ComponentScan("test.SpringMVC.*")
@RequestMapping("/user")
public class UserController {
	@Autowired
	@Qualifier("TUserDao") ;
	private ITUserDao iservice; 
	
	@RequestMapping(value="/checkLogin",produces = {"application/json;charset=UTF-8" })	 
	public @ResponseBody TUser checkLogin(@RequestBody TUser user,Model model,HttpSession session){
		TUser user1=iservice.CheckLoginAndPwd(user.getUserName(), user.getPassword());
			session.setAttribute("user1", user1);
			return user1;	
	}
	
	@RequestMapping(value = "/ulist", method = RequestMethod.GET)
	public ModelAndView getUsers() {
		List<TUser> ulist = iservice.listAll();
		ModelAndView modelAndView = new ModelAndView("user/userslist");// 转到/WEB-INF/jsp/user/userslist.jsp
		modelAndView.addObject("userslist", ulist);
		return modelAndView;
	}
	
	@RequestMapping(value="/register",method={RequestMethod.GET,RequestMethod.POST})
	public ModelAndView register(@ModelAttribute TUser user,Model model){
		ModelAndView modelAndView = new ModelAndView("user/regsuccess");// 转到/WEB-INF/jsp/user/regsuccess.jsp
		if(iservice.CheckLoginAndPwd(user.getUserName(), user.getPassword())!=null||iservice.getById(user.getUserId())!=null){
			model.addAttribute("msg", "注册失败：id不能重复，用户名密码不能都一样！");// 失败也是转到user/regsuccess.jsp这个页面只是显示不一样信息
			return modelAndView;
		}
		model.addAttribute("msg", "注册成功");
		iservice.insert(user);
		return modelAndView;
	}

	@RequestMapping("/LogOut")
	public ModelAndView LogOut(HttpSession session){
		session.invalidate();
		ModelAndView modelAndView = new ModelAndView("user/Login");// 转到/WEB-INF/jsp/user/Login.jsp
		return modelAndView;
	}
	@RequestMapping(value = "/saveUser",produces = "text/html;charset=UTF-8")
	public void saveUser(TUser u){
		iservice.insert(u);
	}
	@RequestMapping("/delUser")
	public void delUser(int id){
    	iservice.deleteById(id);
	}

	@RequestMapping("/updateUser")
	public void updateUser(TUser u){
		iservice.update(u);
	}
	

	@RequestMapping("/userlist.json")
	public @ResponseBody List<TUser> getUserList() {
		return iservice.listAll();
	}
	
	@RequestMapping("/toaddform") 
	public ModelAndView toaddform() {
		ModelAndView modelAndView = new ModelAndView("user/userform");// 转到/WEB-INF/jsp/user/userform.jsp
		return modelAndView;
	}
}

使用@RestController注解等于使用@Controller和@ResponseBody两个注解，标识该类是Spring MVC controller处理器，并且把返回结果直接写入HTTP response body中。所以返回String没有被解析为跳转路径，而是直接把字符串的内容显示到页面上。如返回String需要跳转则用@Controller注解。

六、拦截器Myinterceptor

package test.SpringMVC.controller;

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

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import test.SpringMVC.model.TUser;

public class Myinterceptor implements HandlerInterceptor {

	@Override
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		// TODO 自动生成的方法存根
	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		// TODO 自动生成的方法存根
	}

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object hander) throws Exception {
		// TODO 自动生成的方法存根
		String url=request.getRequestURI();
		if(url.indexOf("/checkLogin.action")>=0){
			return true;
		}
		if(url.indexOf("/register.action")>=0)
		{
			return true;
		}
		HttpSession session=request.getSession();
		TUser user=(TUser)session.getAttribute("user1");
		if(user!=null){
			return true;
		}
		request.getRequestDispatcher("/WEB-INF/jsp/user/Login.jsp").forward(request, response);
		return false;
	}

}

七、页面代码：

首页index.jsp:一个菜单列表，以及用bootstrap实现了右上角登录标志，登录状态就显示用户名，点击注销会通过/LogOut RequestMapping转到Login.jsp叫用户重新登录

<%@ 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">
<link rel="stylesheet" href="css/bootstrap.min.css" />
<script type="text/javascript" src="js/bootstrap.min.js"></script>
<title>Insert title here</title>
</head>
<body>
<!-- 标题 -->
    	<div class="row">
    		<div class="col-md-7">
    			<h1>菜单列表</h1>
    		</div>
    		<div class="col-md-offset-10">
    			<h4>欢迎您：<span class="glyphicon glyphicon-user"></span>
    			      <strong>${user1.userName}</strong>
    			      <small><a href="${pageContext.request.contextPath }/user/LogOut.action">注销</a></small></h4>
    		</div>
    	</div>    	
	<ul>
		<li><a href="user/ulist.do">t_user数据库页面</a></li>
		<li><a href="user/toaddform.do">注册新t_user</a></li>
	</ul>
</body>
</html>

user/Login.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 'Login.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" href="css/bootstrap.min.css" />
<link rel="stylesheet" href="css/bootstrap-datetimepicker.min.css" />
<script type="text/javascript" src="js/jquery-3.2.1.min.js"></script>
<script type="text/javascript" src="js/bootstrap.min.js"></script>
<script type="text/javascript" src="js/bootstrap-datetimepicker.min.js"></script>
<script type="text/javascript"
	src="js/bootstrap-datetimepicker.zh-CN.js"></script>
</head>
<style>
</style>
<script type="text/javascript">
	$("#myModal").modal({
		keyboard : false,
		backdrop : false
	});
	$(function() {

		$("#lo")
				.click(
						function() {
							$
									.ajax({
										type : 'post',
										url : '${pageContext.request.contextPath}/user/checkLogin.action',
										contentType : 'application/json;charset=utf-8',
										data : JSON.stringify({
											"userName" : $("#loginusername")
													.val(),
											"password" : $("#loginpassword")
													.val()
										}),
										success : function(data) {
											if (data == "" || data == null) {
												$("#message").html("用户名或密码错误");
											} else {
 												window.location.href = "${pageContext.request.contextPath}/index.jsp"; //登录成功后转主页面
											}
										}
									});
						});
	});
</script>
<style>
#login {
	width: 450px;
	height: 100px;
	margin: 50px auto;
}
</style>
<body>
	<div class="container">
		<div id="login">
			<form class="form-horizontal" role="form">
				<div class="form-group">
					<label for="inputEmail3" class="col-sm-2 control-label">用户名</label>
					<div class="col-sm-10">
						<input type="text" class="form-control" id="loginusername"
							name="userName" placeholder="请输入您的用户名" required autofocus>
					</div>
				</div>
				<div class="form-group">
					<label for="inputPassword3" class="col-sm-2 control-label">密码</label>
					<div class="col-sm-10">
						<input type="password" class="form-control" id="loginpassword"
							name="password" placeholder="请输入您的密码" required> <label
							class="control-label" for="inputSuccess1" style="color: red;"
							id="message"></label>
					</div>
				</div>
				<div class="form-group">
					<div class="col-sm-offset-2 col-sm-10">
						<button type="button" class="btn btn-info" id="lo">登陆</button>
						<button type="button" class="btn btn-danger" data-toggle="modal"
							data-target="#myModal">点击注册新用户</button>
					</div>
				</div>
			</form>
			<!-- 注册模态框 -->
			<div class="modal fade" id="myModal" tabindex="-1" role="dialog"
				aria-labelledby="myModalLabel" aria-hidden="true">
				<div class="modal-dialog">
					<div class="modal-content">
						<div class="modal-header">
							<button type="button" class="close" data-dismiss="modal">
								<span aria-hidden="true">&times;</span><span class="sr-only">Close</span>
							</button>
							<h4 class="modal-title" id="myModalLabel">用户注册</h4>
						</div>
						<form class="form-horizontal" role="form"
							action="${pageContext.request.contextPath}/user/register.action"
							method="post" id="form">
							<div class="modal-body">
								<!-- 表单 -->
								<div class="form-group">
									<label for="inputEmail3" class="col-sm-3 control-label">用户名</label>
									<div class="col-sm-6">
										<input type="text" class="form-control" id="userName"
											name="userName" placeholder="请输入您的用户名" required autofocus>
									</div>
								</div>
								<div class="form-group">
									<label for="inputPassword3" class="col-sm-3 control-label">密码</label>
									<div class="col-sm-6">
										<input type="password" class="form-control" id="password"
											name="password" placeholder="请输入您的密码" required autofocus>
									</div>
								</div>
							</div>
							<div class="modal-footer">
								<button type="button" class="btn btn-default"
									data-dismiss="modal">关闭</button>
								<button type="submit" class="btn btn-primary" id="save">注册</button>
							</div>
						</form>
					</div>
				</div>
			</div>
		</div>
	</div>
</body>
</html>

user/userform.jsp springmvc表单处理的例子用于注册新用户

<?xml version="1.0" encoding="UTF-8" ?>
<!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>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Spring MVC表单处理</title>
</head>
<body>
<h2>User Information</h2>
   <form action="${pageContext.request.contextPath}/user/register" method="post">  
       编号：<input type="text" name="userId"/>  
       用户名：<input type="text" name="userName"/>  
       密码：<input type="text" name="password"/>
       <input type="submit" value="提交"/>  
   </form> 
</body>
</html>

注册后转到regsuccess.jsp显示信息

<%@ 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 'success.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">
  </head>
  
  <body>
  	<h1>${msg }</h1>   </body>
</html>

userslist.jsp用于显示t_user表的内容

<?xml version="1.0" encoding="UTF-8" ?>
<!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>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<title>JSP显示用户</title>
</head>
<body>
    <table border="1">
    	<tr>
			<th>编号</th>
			<th>名字</th>
			<th>密码</th>
		</tr>
		<c:forEach items="${userslist}" var="users">
			<tr>
				<td>${users.userId}</td>
				<td>${users.userName}</td>
				<td>${users.password}</td>
			</tr>
		</c:forEach>
	</table>
</body>
</html>

八、运行截图：

未登录时点击菜单的条目都会转到登录页面

登录后会转到首页，再点击t_user数据库页面就会显示t_user表的内容

新增用户表单页面

项目代码下载

MyBatis+PageHelper实现分页

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