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Java Web 第二个问题----session问题

2016-01-08 09:57 253 查看
我做的项目遇到的session获得不到值得主要原因是:session值得大小写不一致。需要耐心。经验:以后再有关于session的问题时需要将session的名字复制即可。不要凭空的记。session的用法:(我做的项目的主要代码如下:)////////////////////////////////////login.jsp//////////////////////////////////////<html><head><title>登录页面</title></head><body ><form id="form1" name="form1" method="post" action="login">///要有 <table width="995" height="110" border="0" align="center" bordercolor="#FFCC99"> <tr bordercolor="#0099FF"> <td colspan="2" ><div align="center"><span class="STYLE2"> 苍穹J***A学习论坛</span></div></td> </tr> <tr height="30"></tr> <tr> <td width="183"></td> <td width="413"><table width="432" border="0" height="253"> <tr bgcolor="#FFCC99"> <td colspan="2"><div align="center"><span class="STYLE7">用户登录界面</span></div></td> </tr> <tr bgcolor="#FFCC99"> <td width="134" height="62"><div align="right"><span class="STYLE8">用户名:</span></div></td> <td width="269"><label> <input type="text" name="UserName" " /> <span class="STYLE10">还没注册?</span></label></td> </tr> <tr bgcolor="#FFCC99"> <td height="72"><div align="right"><span class="STYLE8">密 码:</span></div></td> <td><label> <input type="text" name="UserPwd" /> <span class="STYLE10">忘记密码?</span> </label></td> </tr> <tr bgcolor="#FFCC99"> <td height="72" colspan="2"><label> <div align="center"><input name="login" type="submit" class="STYLE11" value="登录" /> <input name="reset" type="reset" class="STYLE11" value="重置" /> </div> </form> </body></html>//////////////////////////LoginServlet.java/////////////////////////////////// public class LoginServlet extends HttpServlet { public LoginServlet() {super();}public void destroy() {super.destroy();} public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { doPost(request,response);} public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { response.setContentType("text/html");response.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter(); String name =request.getParameter("UserName");//获得用户名 String pwd=request.getParameter("UserPwd");//获取密码 HttpSession session=request.getSession(true);////session在servlet的使用 User user=null;UserBiz userbiz=new UserBiz(); //检查用户名与密码try {user=userbiz.login(name, pwd);} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();} try { if(user!=null){session.setAttribute("userN",user.getUserName());///注意大小写 ///session 的设置 response.sendRedirect("user_index.jsp"); }else{ response.sendRedirect("index.jsp");}} catch (RuntimeException e) {// TODO Auto-generated catch blocke.printStackTrace();} out.flush();out.close();} public void init() throws ServletException {// Put your code here}}///////////////////////////////user_index.jsp//////////////////////<%@ page language="java" import="java.util.*" pageEncoding="utf-8" session="true"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><body > <label></label> <p> </p> <table width="1315" height="96" border="0"> <tr bordercolor="#0099FF"> <td width="260" bgcolor="#FFCC99"></td> <td width="782" bgcolor="#FFCC99"><div align="center"><span class="STYLE2">苍穹J***A学习论坛</span></div></td> <td width="397" bgcolor="#FFCC99"><div align="right"><a href="login.jsp">登录</a> | <a href="register.jsp">注册</a> </div></td> </tr> <tr height="30"> <td colspan="3"><span></span><span ></span><span ></span><br></td> </tr> <tr> <% String name=null; if( session.getAttribute("userN")!=null)///注意大小写 { name=(String) session.getAttribute("userN");/////获得session }else{ name="游客"; } %> <td>欢迎您<%=name%></td> <td>主页面</td> <td> </td> </tr> </table> </body></html>
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