用?Session保存表單提交的內容,基本原理是用Session下的setAttribute()? 與 getAttribute() 方法來保存與獲取一個參數．
1．在MY ECLIPSE下創建一個WEB PROJECT,在默認路徑下建立兩個Session的JSP文件,其中Session.JSP用來提交表單內容, Session1.JSP用來獲取由Session保存的參數內容.
2. 創建一個servlet文件，用以處理由Session．JSP提交的表單內容,并將其放入request.setAttribute()方法中．
注：在servlet中不能直接使用Session下的setAttribute()? 與 getAttribute() 方法，在頭文件中必須包含javax.servlet.Http.*;?? 創建Session對象時要先聲明這個對象,使用語法為:
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
<%@ 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>
?
?
? <body>
?? <%
?? List<String> array=new ArrayList();??? // List 用以保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以后的版本支持的 foreach 語法
?? {
?? out.println(name);
?? out.print("<p>");
?? }
??? %>
? </body>
</html>
Form.java?? // servlet文件
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
?}
}
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