java读取session变量问题----在线等待

看看包含读取页面中的session变量的jsp文件編譯后的servlet.

解决方案 »

  1.   

    不是jsp文件，是java的servlet文件。
      

  2.   

    怎么没我来了，我的.class文件怎么办啊。请大家帮忙啊。
      

  3.   

    HttpSession session=request.getSession(false);
    String paramValue = session.getAttribute(paramName);
      

  4.   

    设置session：request.getSession().setAttribute("name",name);
    取session：request.getSession().getAttribute("name");
    其中request为HttpServletRequest类型
      

  5.   

    如果form传递类型是post则在servlet的doPost方法里写
    public void doPost (HttpServletRequest req, HttpServletResponse res)
    {HttpSession session=res.getSession(false);
    String paramValue = session.getAttribute(paramName);
    }
    如果是get就在doGet里写
      

  6.   

    随手一个，sun的/*
     *
     * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
     * 
     * This software is the proprietary information of Sun Microsystems, Inc.  
     * Use is subject to license terms.
     * 
     */import java.io.*;
    import java.util.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    import database.*;
    import cart.*;
    import util.Currency;
    import exception.*;/**
     * This is a simple example of an HTTP Servlet.  It responds to the GET
     * method of the HTTP protocol. 
     */
    public class BookDetailsServlet extends HttpServlet {   private BookDB bookDB;   public void init() throws ServletException {
          bookDB =
                (BookDB)getServletContext().getAttribute("bookDB");
             if (bookDB == null)
                 throw new UnavailableException("Couldn't get database.");
       }   public void destroy() {
             bookDB = null;
       }      
       public void doGet (HttpServletRequest request,
                           HttpServletResponse response)
            throws ServletException, IOException {        HttpSession session = request.getSession(true);
         ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");   // set headers and buffer size before accessing the Writer
            response.setContentType("text/html");
                response.setBufferSize(8192);
                PrintWriter out = response.getWriter();   // then write the response
            out.println("<html>" +
                        "<head><title>" + messages.getString("TitleBookDescription") + "</title></head>");        // Get the dispatcher; it gets the banner to the user
            RequestDispatcher dispatcher =
                   getServletContext().getRequestDispatcher("/banner");
                                           
                if (dispatcher != null)
                   dispatcher.include(request, response);
                   
            //Get the identifier of the book to display
            String bookId = request.getParameter("bookId");
            if (bookId != null) {            // and the information about the book
                try {
                   BookDetails bd = bookDB.getBookDetails(bookId);
                   Currency c = (Currency)session.getAttribute("currency");
                   if (c == null) {
                      c = new Currency();
                      c.setLocale(request.getLocale());
                      session.setAttribute("currency", c);
                   }
                   c.setAmount(bd.getPrice());
                         //Print out the information obtained
                   out.println("<h2>" + bd.getTitle() + "</h2>" +
                               "&nbsp;" + messages.getString("By") + " <em>" + bd.getFirstName() + " " +
                               bd.getSurname() + "</em> &nbsp; &nbsp; " +
                               "(" + bd.getYear() + ")<br> &nbsp; <br>" +
                               "<h4>" + messages.getString("Critics")+ "</h4>" +
                               "<blockquote>" + bd.getDescription() +
                               "</blockquote>" +
                               "<h4>" + messages.getString("Price") + c.getFormat() + "</h4>" +
                               "<p><strong><a href=\"" +
                               response.encodeURL(request.getContextPath() + "/catalog?bookId=" + bookId) +
                               "\">" + messages.getString("CartAdd") + "</a>&nbsp;&nbsp;&nbsp;" +
                               "<a href=\"" + 
                               response.encodeURL(request.getContextPath() + "/catalog") + "\">" + messages.getString("ContinueShopping") + "</a></p></strong>");
                } catch (BookNotFoundException ex) {
                         response.resetBuffer();
                         throw new ServletException(ex);
                }
                                                }
            out.println("</body></html>");
            out.close();
        }    public String getServletInfo() {
            return "The BookDetail servlet returns information about" +
                   "any book that is available from the bookstore.";
        }}
      

  7.   

    给改写一下这几行吧？
    ***************************************************
    public class check extends javax.servlet.http.HttpServlet
    {
    public check()
    {
    super();
    }

    public void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException
    {
    HttpSession session=request.getSession(false);
    String ss = session.getAttribute("Check_User");
    }
    }
      

  8.   

    import javax.servlet.http.*;
    import javax.servlet.*;public class check extends HttpServlet{
        public check(){
            super();
        }
        public void doGet(HttpServletRequestrequest,HttpServletResponse response) throws ServletException, java.io.IOException{
            HttpSession session=request.getSession(false);
            String ss = (String)session.getAttribute("Check_User");
        }
    }