jsp使用者登入驗證
阿新 • • 發佈：2019-02-03
專案結構
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>使用者登入</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> <form method="post" action="loginCheck.jsp"> <center> <h4>xxx學生管理系統</h4> <table> <tr> <td>使用者名稱:</td> <td><input type="text" name="username"></td> </tr> <tr> <td>密 碼:</td> <td><input type="password" name="password"></td> </tr> <tr> <td></td> <td><input type="submit" value="登入" onclick="check()"> <input type="reset" value="重置"></td> </tr> </table> </center> </form> </body> </html>
介面效果
loginCheck.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>使用者登入</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> <form method="post" action="loginCheck.jsp"> <center> <h4>xxx學生管理系統</h4> <table> <tr> <td>使用者名稱:</td> <td><input type="text" name="username"></td> </tr> <tr> <td>密 碼:</td> <td><input type="password" name="password"></td> </tr> <tr> <td></td> <td><input type="submit" value="登入" onclick="check()"> <input type="reset" value="重置"></td> </tr> </table> </center> </form> </body> </html>
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>學生管理系統</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"> --> <style type="text/css"> ul{ list-style-type: none; background-color:#333; margin:0; padding:0; } li a{ text-decoration: none; color:white; } li{ display: inline; padding: 10px 16px; } </style> </head> <body> <% String username=session.getAttribute("user").toString(); %> <ul> <li><a href="">學生管理</a></li> <li><a href="">課程管理</a></li> <li><a href="">成績管理</a></li> </ul> <p><font color="red"><%=username%></font>歡迎您,使用學生管理系統！</p> </body> </html>
介面效果
loginError.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>登入錯誤頁面</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="styles.css">
-->
</head>
<body>
登入失敗，使用者名稱或密碼輸入有誤。 <br>
<a href="login.jsp">返回登入</a>
</body>
</html>DbHelper類
package com;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
public class DbHelper {
private Connection conn=null;
private Statement stmt=null;
private ResultSet rest=null;
private PreparedStatement prst=null;
public Connection getConn(){
try{
String url="jdbc:mysql://localhost:3306/student";
String username="root";
String password="root";
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection(url,username,password);
if(conn!=null){
System.out.println("資料庫連線成功。");
}else{
System.out.println("資料庫連線失敗。");
}
}catch(Exception e){
e.printStackTrace();
}
return conn;
}
public ResultSet selectUser(String name,String pwd){
try{
conn=getConn();
String sql="select * from user where username=? and password=?";
prst=conn.prepareStatement(sql);
prst.setString(1, name);
prst.setString(2, pwd);
rest=prst.executeQuery();
}catch(Exception e){
e.printStackTrace();
}
return rest;
}
}