我正在使用rollno作为会话对象,并且我必须在“html”输入字段的值属性中使用该值,这里是我的jsp
编码如何在jsp的`html`输入字段的value属性中使用Session对象
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@page import="javax.servlet.http.HttpSession"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<%!HttpSession value=null; %>
</head>
<body>
<form action="ShowMarkServlet">
<% value=(HttpSession)session.getAttribute("rollno");%>
<%out.print(session.getAttribute("rollno")); %>
Rollnumber:<input type="number" value="<%=value%>" name="rollno"><br>
Enter the semester:<input type="number" name="semester" min="0" max="6">
<input type="submit" value="okay">
</form>
</body>
</html>
这是我的servlet
编码rollno在此servlet中的值,但在jsp文件中显示为空。
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String rollno=request.getParameter("rollnumber");
System.out.println(rollno);
String report=request.getParameter("domainarea");
System.out.println(report);
HttpSession session=request.getSession();
session.setAttribute(rollno,"rollno");
if(report.equals("MarkDetail")){
request.getRequestDispatcher("/sem.jsp").forward(request, response);
}
这取决于你打算怎么做,了解这些htmls是由b组成的b y servlet其中jsp在编译后转换 –
没关系,但是如何访问那个会话对象,它在jsp显示中显示为null <%out.print(session.getAttribute(“rollno”)); %>' – balan