Session。
例子:Welcome.jsp和loginservlet.java
先在servlet里面写入session代码
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {HttpSession session=null;
//通过request来得到session对象
session=request.getSession();
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
//12290890117-软开1班-陈允仁
String username=request.getParameter("uname");
String userpass=request.getParameter("upass");
if(username.equals("jack")&&userpass.equals("abcd")){
//向session存入数据，这里是存放登录信息
session.setAttribute("LoginUser", username);
RequestDispatcher dis=request.getRequestDispatcher("welcome.jsp");
dis.forward(request,response);
}else{
response.sendRedirect("login.jsp");
}
再在jsp页面写session代码
<%
String uname=(String)session.getAttribute("Loginuser");
if(uname!=null){
response.sendRedirect("login.jsp");
return;
}
%>
Session。
例子:Welcome.jsp和loginservlet.java
先在servlet里面写入session代码
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {HttpSession session=null;
//通过request来得到session对象
session=request.getSession();
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
//12290890117-软开1班-陈允仁
String username=request.getParameter("uname");
String userpass=request.getParameter("upass");
if(username.equals("jack")&&userpass.equals("abcd")){
//向session存入数据，这里是存放登录信息
session.setAttribute("LoginUser", username);
RequestDispatcher dis=request.getRequestDispatcher("welcome.jsp");
dis.forward(request,response);
}else{
response.sendRedirect("login.jsp");
}
再在jsp页面写session代码
<%
String uname=(String)session.getAttribute("Loginuser");
if(uname!=null){
response.sendRedirect("login.jsp");
return;
}
%>