（1）建立登入界面login.jsp
<body>
<form action="do_login.jsp" method="post">
賬戶：<input type="text" name="username"><br>
密碼：<input type="password" name="password"><br>
<input type="submit" name="提交">
</form>
</body>（2）建立do_login.jsp處理用戶處理
<%
request.setCharacterEncoding("utf-8");//設置編碼UTF-8
String username=request.getParameter("username");
String password=request.getParameter("password");
if("admin".equals(username)&&"admin".equals(password)){
request.getRequestDispatcher("login_success.jsp").forward(request,response);
session.setAttribute("loginame",username);
}
else{
response.sendRedirect("login_failure.jsp");
}
%> （3）成功login_sucess.jsp
<body>
<%
String loginame=" ";
if(session.getAttribute("loginame")!=null){
loginame=session.getAttribute("loginame").toString();
}
%>
歡迎<%=loginame %>登入成功
</body>（4）登入失敗login_failure.jsp
<body>
登入失敗<a href="login.jsp">返回</a>
</body>