使用Session在JSP頁面間傳遞表單內容

最後更新：2018-12-05 來源：互聯網

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用 Session儲存表單提交的內容,基本原理是用Session下的setAttribute() 與　getAttribute()　方法來儲存與擷取一個參數．

1．在MY ECLIPSE下建立一個WEB PROJECT,在預設路徑下建立兩個Session的JSP檔案,其中Session.JSP用來提交表單內容, Session1.JSP用來擷取由Session儲存的參數內容.

2.　建立一個servlet檔案，用以處理由Session．JSP提交的表單內容,並將其放入request.setAttribute()方法中．

註：在servlet中不能直接使用Session下的setAttribute() 與　getAttribute()　方法，在標頭檔中必須包含javax.servlet.Http.*; 建立Session對象時要先聲明這個對象,使用文法為:

Http Session session=request.getSession();

具體代碼如下：

Session．JSP

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

</head>

<body>
<form action="Form">  
   A :<input type="text" name="a" size=5><p>  
   B :<input type="text" name="b" size=5><p>  
   C :<input type="text" name="c" size=5><p>  
   <input type=submit value="Submit">
</form>
</body>
</html>

Session1．JSP

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

<body>
   <%
   List<String> array=new ArrayList();    // List 用以儲存表單中的每一個值
   array=(List<String>)request.getAttribute("array");
   out.print("<h2>Session save A,B,C :</h2><p>"); //JDK
   for(String name:array)   //JDK1.4以後的版本支援的　foreach　文法
   {
   out.println(name);
   out.print("<p>");
   }
    %>
</body>
</html>

Form.java // servlet檔案

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.*;
import java.util.*;
public class Form extends HttpServlet {

/**
* Constructor of the object.
*/
public Form() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  String a=(String)request.getParameter("a");
  String b=(String)request.getParameter("b");
  String c=(String)request.getParameter("c");
  List<String> array=new ArrayList();
  array.add(a);array.add(b);array.add(c);
  HttpSession session=request.getSession(true);
  session.setAttribute("array",array);
  request.setAttribute("array",session.getAttribute("array"));
  getServletConfig().getServletContext().getRequestDispatcher(
    "/session1.jsp").forward(request, response);
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request,response);
}

/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}

}

為我在my eclipse 下建立的Web project　結構圖：

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