標籤：
首先我們需要寫一個簡單的登陸頁面login.jsp，然後用from表單提交給index.jsp頁面。在index.jsp頁面通過DBHelper串連資料庫判斷帳號和密碼，如果密碼正確則顯示登陸成功。
下面是登陸頁面代碼
<html>
<head>
<base href="<%=basePath%>">
<title>登陸頁面</title>
</head>
<body>
//提交使用者名稱密碼到index.jsp
<form action="index.jsp" name="form1" method="post" >
<div >
<a>使用者：</a><br> <input class="yh" type="text" value="" name="username" /><br>
<a>密碼：</a><br> <input class="ma" type="password" value="" name="password" /><br>
<input class="dl1" type="submit" value="登陸" />
</div>
</form>
</body>
</html>
：
下面是index.jsp 的代碼：
<%@ page language="java" import="java.util.*,DBHelper.*,java.sql.*" 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>驗證頁面</title>
</head>
<body>
<%
String SQL="SELECT * FROM user WHERE username=? AND password=?";
String uid=request.getParameter("uid");
String pwd=request.getParameter("pwd");
Object[] params=new Object[]{uid,pwd};
ResultSet rs=DBHelper.getResultSet(SQL,params);
if(rs.next())
out.print("登入成功");
else
out.print("登入失敗");
rs.close();
%>
</body>
</html>
然後將DBHelper包copy到src檔案夾下
將DBHelper代碼裡的使用者名稱和密碼換成你的mysql資料庫的。
然後就可以運行了。
我的運行結果
用DBHelper在JSP頁面中實現登入功能
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