登錄的源碼（1）登錄（2）處理登錄（3）登錄成功（4）登錄失敗 哪里錯了求解？？？？？
(1)
<%@ page language="java" import="java.util.*" contentType="text/html;charset=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>
? ? ?
? </head>
? <body>
? ? <form action="dologin.jsp" method="post">
? ? <table>
? ? <tr><td>用戶名</td></tr>
? ? <tr><td><input type="text" name="username"></td></tr>
? ? ?<tr><td>密碼</td></tr>
? ? ?<tr><td><input type="password" name="password"></td></tr>
? ??
? ? ?<tr><td>
? ? ?<input type="submit" name="submit" value="登錄">
? ? ?</td></tr>
? ? </table>
? ? </form>
?
? </body>
?
</html>
? ?
(2)
<%@ page language="java" import="java.util.*" ?contentType="text/html;charset=utf-8"%>
<%
? ?String path = request.getContextPath();
? ?String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
? ?String username ="";
? ?String password ="";
? ?
? ?request.setCharacterEncoding("utf-8"); ?//防止出現(xiàn)中文亂碼
? ?
? ?username=request.getParameter("username");
? ?password=request.getParameter("password");
? ?
? ?//如果用戶名和密碼都等于admin則登陸成功
? ?if("admin".equals(username)&&"admin".equals(password))
? ?{
? ? ?request.getRequestDispatcher("Login_success.jsp").forward(request, response);
? ?}
? ?else
? ?{
? ? ?response.sendRedirect("Login_failure.jsp");
? ?}
%>
(3)
<%@ page language="java" import="java.util.*" contentType="text/html;charset=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>
? ?
? ?
? </head>
? <body>?
? ? ? ? ? 登錄成功?
?
? </body>
?
</html>
(4)
<%@ page language="java" import="java.util.*" contentType="text/html;charset=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>
? ??
? </head>
?
? <body>
? ? ? ? 登錄失敗 ?<a href="Login.jsp">重新登錄</a>
?
? </body>
?
</html>
2015-11-08
我用你的代碼可以運行。
2016-04-11
跟你的一摸一樣我的也一直登陸失敗，怎么回事?。?/p>
2015-11-09
恩 ?謝謝。