Jakarta ee 会话传递失败-servlet
下面是我希望通过会话的两个servlet 问题是会话传递是在导航到SuccessPage servlet时完成的，而不是在导航到失败servlet时完成的 登录servletJakarta ee 会话传递失败-servlet,jakarta-ee,servlets,session-variables,Jakarta Ee,Servlets,Session Variables,下面是我希望通过会话的两个servlet 问题是会话传递是在导航到SuccessPage servlet时完成的，而不是在导航到失败servlet时完成的 登录servletdoGet（）方法： protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ PrintWriter out=response.ge
doGet（）protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException{
PrintWriter out=response.getWriter();
response.setContentType("text/html");
String userName=request.getParameter("userName");
String userPass=request.getParameter("userPassword");
String userRePass=request.getParameter("userRePassword");
try{
String query="Select VendorName from vendorinfo where VendorPass=?";
connection1=Connection_Class.getInstance().getConnection();
ptmt=connection1.prepareStatement(query);
ptmt.setString(1,userPass);
rs=ptmt.executeQuery();
if(rs.next()&& userName.equalsIgnoreCase(rs.getString("VendorName"))){
HttpSession session=request.getSession(true);
session.setAttribute("loggedVendor",rs.getString(1));
//this is working fine...im able to get the userName in the next servlet
ServletContext context = getServletContext();
RequestDispatcher dispatcher=context.getRequestDispatcher("/SuccessPage");
dispatcher.forward(request,response);
}
else{ //this is not working .....whats the problem here ?
request.setAttribute("wrongUser",userName);
ServletContext context=getServletContext();
RequestDispatcher dispatcher=context.getRequestDispatcher("/Failure");
dispatcher.forward(request,response);
}
}
catch(SQLException e){
e.printStackTrace();
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
/*all i want to do here is that I want to get the userName from the previous servlet but its
not displaying that and its displaying null */
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("<body bgcolor=#F3EEF0><h1>");
out.println("<center>");
HttpSession session=request.getSession(false);
out.println("This is a failure page");
out.println(session.getAttribute("wrongUser"));
out.println("</center></h1></body>");
}
doGet（）protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException{
PrintWriter out=response.getWriter();
response.setContentType("text/html");
String userName=request.getParameter("userName");
String userPass=request.getParameter("userPassword");
String userRePass=request.getParameter("userRePassword");
try{
String query="Select VendorName from vendorinfo where VendorPass=?";
connection1=Connection_Class.getInstance().getConnection();
ptmt=connection1.prepareStatement(query);
ptmt.setString(1,userPass);
rs=ptmt.executeQuery();
if(rs.next()&& userName.equalsIgnoreCase(rs.getString("VendorName"))){
HttpSession session=request.getSession(true);
session.setAttribute("loggedVendor",rs.getString(1));
//this is working fine...im able to get the userName in the next servlet
ServletContext context = getServletContext();
RequestDispatcher dispatcher=context.getRequestDispatcher("/SuccessPage");
dispatcher.forward(request,response);
}
else{ //this is not working .....whats the problem here ?
request.setAttribute("wrongUser",userName);
ServletContext context=getServletContext();
RequestDispatcher dispatcher=context.getRequestDispatcher("/Failure");
dispatcher.forward(request,response);
}
}
catch(SQLException e){
e.printStackTrace();
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
/*all i want to do here is that I want to get the userName from the previous servlet but its
not displaying that and its displaying null */
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("<body bgcolor=#F3EEF0><h1>");
out.println("<center>");
HttpSession session=request.getSession(false);
out.println("This is a failure page");
out.println(session.getAttribute("wrongUser"));
out.println("</center></h1></body>");
}
protectedvoid doGet（HttpServletRequest请求，HttpServletResponse响应）抛出
ServletException，IOException{
/*这里我想做的就是从前面的servlet中获取用户名，但是它是
不显示它，并且它的显示为空*/
response.setContentType（“text/html”）；
PrintWriter out=response.getWriter（）；
out.println（“”）；
out.println（“”）；
HttpSession session=request.getSession（false）；
out.println（“这是一个失败页面”）；
out.println（session.getAttribute（“错误用户”）；
out.println（“”）；
}
代码中是否有错误？您正在请求中放置键为“错误用户”的数据，而不是在第一个servlet中放置会话：
request.setAttribute("wrongUser",userName);
session.getAttribute("wrongUser");