代码如下：

前台：

$.ajax({
		url : '../servlet/Login_Do',
		data : {
			name : $('#loginForm input[name=name]').val(),
			password : $('#loginForm input[name=password]').val()
		},
		dataType : 'json',
		success : function(data) {
			if (data.msg == null) {
				alert("用户名密码错误");
			} else {
				loginDialog.dialog('close');
				window.location.href ='Panel.jsp';
			}
		},
		error : function() {
			alert("失败");
		}
});

后台：（在验证信息的servlet中直接保存session,然后在跳转的新的页面可以直接session.getAttribute()）

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8"); 
		response.setCharacterEncoding("utf-8");
		name= new String(request.getParameter("name").getBytes("ISO-8859-1"),"utf-8") ; 
	    System.out.println(name);
	    password = request.getParameter("password");
		PrintWriter out = response.getWriter();
		JSONObject json = new JSONObject();
		String msg = ""; 
		try {
			json.put("msg",login());
			out.print(json.toString());
			HttpSession session = request.getSession();
			session.setAttribute("name", login());
			
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		
	}
	public String login() throws SQLException{
		Dao user = new Dao(name,password);
		Dao u = new Dao();
		u = user.login();
		if(u.getName()!=null){
			return u.getName();
		}
		else
			return null;
	}

跳转后的页面接收参数部分：

<%
		String a = String.valueOf(session.getAttribute("name"));
%>
		<%=a %>您好，欢迎您的登录