login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="check.jsp" >
用户名：<input type="text" name="uname"><br/>
密码：<input type="password" name="upwd"><br/>
<input type="submit" value="登录"><br/>
</form>
</body>
</html>
check.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String name = request.getParameter("uname");
String pwd = request.getParameter("upwd");
if(name.equals("zs")&&pwd.equals("abc"))
{
response.sendRedirect("success.jsp");
}
else
{
out.print("用户名或者密码失败");
}
%>
</body>
</html>
success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
登录成功！<br/>
欢迎您：
<%
String name =request.getParameter("uname");
out.print(name);
%>
</body>
</html>
这里的null表示页面元素丢失了。
现在修改转发的方式：
check.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String name = request.getParameter("uname");
String pwd = request.getParameter("upwd");
if(name.equals("zs")&&pwd.equals("abc"))
{
//response.sendRedirect("success.jsp");
request.getRequestDispatcher("success.jsp").forward(request,response);
}
else
{
out.print("用户名或者密码失败");
}
%>
</body>
</html>
