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我是java的初學者,我在練習基本的java web。在這個前例中,我無法用另一個用戶名登錄,只有「admin」的用戶名是accept。錯誤在哪裏?無法通過基本的java網頁登錄
//admin.jsp
<%
MemberDAO member = new MemberDAO();
%>
<h1>Welcome ${member.getUsername()} to the system</h1>
<a href="ControllerServlet?action=logout">Log out</a>
//login.jsp
<form action="ControllerServlet" method="post">
<input type="hidden" value="login" name="action"/>
Username:
<input type="text" name="username" placeholder="Username"/>
<input type="submit" value="login"/>
</form>
// ControllerServlet.java
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String action = request.getParameter("action");
RequestDispatcher dispatcher = null;
if (action == null || action.equals("logout")){
dispatcher = request.getRequestDispatcher("login.jsp");
}
else if(action.equals("login")){
MemberDAO dao = new MemberDAO();
String username = request.getParameter("username");
if(dao.checklogin(username)){
dispatcher = request.getRequestDispatcher("admin.jsp");
}
else{
dispatcher = request.getRequestDispatcher("login.jsp");
}
}
dispatcher.forward(request, response);
}
// MemberDAO.java
public boolean checklogin(String username){
if (username != null && username.equals("admin"))
return true;
return false;
}
而我有Member.java,它有構造函數和用戶名。
謝謝!我是初學者.... –