MVC：模型（model）-视图（view）-控制器（Controller）
1.model : 处理数据逻辑部分，对数据库进行操作，业务逻辑
2.view : 数据显示部分，用户操作
3.controller : 从视图层读取数据，通过模型层完成操作
效果图：
该项目采用MVC模式，前端页面用到了Bootstrap及Jquery
项目结构：
首页index.jsp,注册页面采用的Bootstrap的模态框
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>登录页面</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="./bootstrap-3.3.7-dist/css/bootstrap.css"> <script src="./jquery-3.2.1/jquery-3.2.1.min.js"></script> <script src="./bootstrap-3.3.7-dist/js/bootstrap.min.js"></script> </head> <style> #re { margin-top: 10px; float: right; } </style> <script type="text/javascript"> function vform(){ var name = $("#na").val(); var password = $("#pw").val(); if(name == ""){ alert("请输入用户名"); return false; } if(password == ""){ alert("请输入密码"); return false; } return true; } </script> <body> <div class="container"> <!--模态框，点击注册按钮弹窗--> <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"> <div class="modal-dialog" role="document"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true">×</span> </button> <h4 class="modal-title" id="myModalLabel">用户注册</h4> </div> <div class="modal-body"> <form class="form-horizontal" action="Register" method="post" onsubmit="return vform()"> <div class="form-group"> <label class="col-sm-2 control-label">帐号</label> <div class="col-sm-10"> <input type="text" class="form-control" id="un" name="username" placeholder="请输入帐号"> </div> </div> <div class="form-group"> <label class="col-sm-2 control-label">密码</label> <div class="col-sm-10"> <input type="password" class="form-control" id="pw" name="password" placeholder="Password"> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <button type="submit" class="btn btn-default">提交</button> <font color="red">${error}</font> </div> </div> </form> </div> </div> </div> </div> <!-- ============================================================================= --> <button class="btn btn-default" id="re" data-toggle="modal" data-target="#myModal">注册</button> <center> <h1>用户登录</h1> </center> <hr> <form class="form-horizontal" action="LoginServlet" method="post"> <div class="form-group"> <label class="col-sm-2 control-label">帐号</label> <div class="col-sm-10"> <input type="text" class="form-control" id="username" name="username" value="${username}" placeholder="请输入帐号"> </div> </div> <div class="form-group"> <label class="col-sm-2 control-label">密码</label> <div class="col-sm-10"> <input type="password" class="form-control" id="password" name="password" value="${password}" placeholder="Password"> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <button type="submit" class="btn btn-default">登录</button> <font color="red">${error}</font> </div> </div> </form> </div> </body> </html>
main.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%-- <%@ page language="java" import="com.login.model.*" pageEncoding="utf-8" %> --%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>用户列表</title>
<link rel="stylesheet" type="text/css"
href="./bootstrap-3.3.7-dist/css/bootstrap.css">
<script src="./jquery-3.2.1/jquery-3.2.1.min.js"></script>
<script src="./bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
</head>
<style>
h4 {
float: right;
}
</style>
<body>
<div class="container">
<h4>欢迎你:${currentUser.username}</h4>
<center>
<h1>员工信息列表</h1>
</center>
<div class="row">
<div class="col-md-4 col-md-offset-8">
<button class="btn btn-primary">新增</button>
</div>
</div>
<div class="row">
<div class="col-md-12">
<table class="table table-condensed">
<tr>
<td>ID</td>
<td>姓名</td>
<td>性别</td>
<td>邮箱</td>
<td>出生年月</td>
<td>操作</td>
</tr>
<c:forEach var="list" items="${list}">
<tr>
<td>${list.id}</td>
<td>${list.name}</td>
<td><c:if test="${list.gender eq 0 }">男</c:if>
<c:if test="${list.gender eq 1 }">女</c:if>
</td>
<td>${list.email}</td>
<td>${list.birthday}</td>
<td><button class="btn btn-primary">编辑</button>
<button class="btn btn-danger">删除</button>
</td>
</tr>
</c:forEach>
</table>
</div>
</div>
</div>
</body>
</html>
数据库连接代码：DbUtil.java
package com.login.util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class DbUtil { private String url="jdbc:mysql://localhost:3306/ssm"; private String driver="com.mysql.jdbc.Driver"; private String user="root"; private String password="123"; public Connection getCon() throws Exception{ Class.forName(driver); Connection con=DriverManager.getConnection(url,user,password); return con; } public static void getClose(Connection con) throws SQLException{ if(con!=null){ con.close(); } } }
实体类：User.java
package com.login.model; public class User { private int id; private String username; private String password; public User() { super(); } public User(String username, String password) { super(); this.username = username; this.password = password; } public int getId() { return id; } public void setId(int 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; } }
Employee.java
package com.login.model; import java.util.Date; public class Employee { private int id; private String name; private String password; private int gender; private String email; private Date birthday; public Employee() { super(); } public Employee(int id, String name, String password, int gender, String email, Date birthday) { super(); this.id = id; this.name = name; this.password = password; this.gender = gender; this.email = email; this.birthday = birthday; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public int getGender() { return gender; } public void setGender(int gender) { this.gender = gender; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } }
UserDao.java
package com.login.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import com.login.model.User; public class UserDao { // 登录 public User login(Connection con, User user) throws SQLException { User resultUser = null; String sql = "select * from user where username=? and password=?"; PreparedStatement ps = con.prepareStatement(sql); ps.setString(1, user.getUsername()); ps.setString(2, user.getPassword()); ResultSet rs = ps.executeQuery(); if (rs.next()) { resultUser = new User(); resultUser.setUsername(rs.getString("username")); resultUser.setPassword(rs.getString("password")); } return resultUser; }
// 显示所有信息
public User getAll(Connection con, User user) throws SQLException {
User resultUser = null;
String sql = "select * from user ";
PreparedStatement ps = con.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
if (rs.next()) {
resultUser = new User();
}
return resultUser;
} // 注册 public boolean insert(Connection con, User user) { String sql = "insert into user(username,password) values(?,?)"; boolean flag = false; try { PreparedStatement psta = con.prepareStatement(sql);// psta.setString(1, user.getUsername()); psta.setString(2, user.getPassword()); flag = psta.executeUpdate() > 0; } catch (Exception e) { e.printStackTrace(); } try { con.close(); } catch (SQLException e) { e.printStackTrace(); } return flag; } }
LoginServlet.java
package com.login.servlet; import java.io.IOException; import java.sql.Connection; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.login.dao.UserDao; import com.login.model.User; import com.login.util.DbUtil; public class LoginServlet extends HttpServlet { /** * */ private static final long serialVersionUID = 1063251913450385726L; DbUtil db = new DbUtil(); UserDao userDao = new UserDao(); public LoginServlet() { super(); } public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = request.getParameter("username"); String password = request.getParameter("password"); Connection con = null; try { User user = new User(username,password); con = db.getCon(); User currentUser=userDao.login(con, user); if(currentUser == null){ request.setAttribute("error", "用户名或密码错误"); request.setAttribute("username", username); request.setAttribute("password", password); request.getRequestDispatcher("index.jsp").forward(request, response); }else{ //使用request对象的getSession()获取session，如果session不存在则创建一个 HttpSession session = request.getSession(); //将数据存储到session中 session.setAttribute("currentUser",currentUser); ArrayList<Employee> list = userDao.selectNotDeleteList();
if (list != null) {
HttpSession session1 = request.getSession();
// 将数据存储到session中
session1.setAttribute("list", list);
response.sendRedirect("main.jsp");
} } } catch (Exception e) { e.printStackTrace(); } } public void init() throws ServletException { } }
Register.java
package com.login.servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.Connection; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.login.dao.UserDao; import com.login.model.User; import com.login.util.DbUtil; public class Register extends HttpServlet { private static final long serialVersionUID = -6373590750212315505L; DbUtil db=new DbUtil(); UserDao userDao=new UserDao(); public Register() { super(); } public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username=request.getParameter("username"); String password=request.getParameter("password"); Connection con=null; User user=new User(username,password); try{ con=db.getCon(); }catch(Exception e){ e.printStackTrace(); } boolean current=userDao.insert(con, user); if(current){ request.setAttribute("error", "注册成功,请登录"); request.getRequestDispatcher("index.jsp").forward(request, response); }else{ request.setAttribute("error", "注册失败"); request.getRequestDispatcher("regist.jsp").forward(request, response); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } public void init() throws ServletException { // Put your code here } }
小总结：前一个多月都花时间在SSM上面了，对于Servlet和Jsp的基础不怎么样，所以现在还是开始把基础打好，再去研究其他框架。