Java jsp:forward从jsp页面删除所有html
我对使用jsp和servlets还不熟悉,所以请耐心等待。我正在建立的网站有一个登录表单,可以访问其余页面。当您登录时,它会用您的用户名设置一个cookie,这样做的目的是让另一个页面在您尝试访问它们时检查此cookie 登录表单在操作中运行此登录Servlet:Java jsp:forward从jsp页面删除所有html,java,jsp,servlets,cookies,Java,Jsp,Servlets,Cookies,我对使用jsp和servlets还不熟悉,所以请耐心等待。我正在建立的网站有一个登录表单,可以访问其余页面。当您登录时,它会用您的用户名设置一个cookie,这样做的目的是让另一个页面在您尝试访问它们时检查此cookie 登录表单在操作中运行此登录Servlet: public class LoginServlet extends HttpServlet implements Constants { /** * Processes requests for both HTTP <cod
public class LoginServlet extends HttpServlet implements Constants {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String Username = request.getParameter("username");
String password = request.getParameter("password");
if (StringUtils.isStringEmpty(Username) || StringUtils.isStringEmpty(password)) {
RequestDispatcher rd = request.getRequestDispatcher("/index.html");
rd.forward(request, response);
} else {
System.out.println(Username + password);
UserManager uMgr = new UserManager();
User user = uMgr.loginUser(Username, password);
if (user == null) {
RequestDispatcher rd = request.getRequestDispatcher("/login.jsp");
rd.forward(request, response);
} else {
if (user.isIsAdmin() == TRUE) {
Cookie loginCookie = new Cookie("ADMIN", Username);
//setting cookie to expiry in 30 mins
loginCookie.setMaxAge(30*60);
response.addCookie(loginCookie);
request.getSession(true).setAttribute(SESSION_ADMIN, user);
RequestDispatcher rd = request.getRequestDispatcher("index.jsp");
rd.forward(request, response);
} else {
RequestDispatcher rd = request.getRequestDispatcher("/login.jsp");
rd.forward(request, response);
}
}
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
在index.jsp页面上,我有一段代码要在开头的body标记之后运行:
<jsp:forward page="CookieServlet"/>
登录代码起作用,它为我创建cookie,检查cookie的cookieservlet也会检查cookie,但在任何包含
的页面上都不会显示任何HTML。有什么不对的想法吗?没什么不对的。这就是前锋的作用。转发到另一个资源就像说:“我已经完成了此请求的部分工作,现在将控制权转移到另一个资源”
您不应该在视图中检查登录名。你甚至不应该在控制器中检查它。在调用任何控制器之前,您应该在中心位置检查它:a 当你向前看时,你会从一页转到另一页。当然,新页面上的信息与旧页面上的信息不同。如果您导航到一个页面,但仍然显示旧页面,这将是一个错误
public class CookieServlet extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
String userName = null;
Cookie[] cookies = request.getCookies();
if(cookies !=null){
for(Cookie cookie : cookies){
if(cookie.getName().equals("ADMIN")) userName = cookie.getValue();
}
}
if(userName == null) response.sendRedirect("login.jsp");
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}