请教关于Session问题

gebi0107 2014-03-25 02:04:04

小白问题。
编写ExS.html ExSession.java ExS01.html ExSession01.java
ExS.html驱动ExSession.class生成页面，创建一个session 这个页面包含一个链接B.html 然后ExS01.html驱动BExSession01.class 那么生成的页面中能获取到ExSession创建的session吗？语言比较混乱，勿怪。
我的总是获取不到是NULL.
ExS.html:

<form method = "post" action = "ExSession">

    	<p align = "left">

    		<font size = "5"><b>Font of Page</b></font>

    	</p>

    	<p></p>

    	<p align = "left">

    		<input type = "submit" value = "go to Sub Page">

    	</p>

    </form>

ExSession.java

import javax.servlet.http.*;

import javax.servlet.*;

import java.io.*;





public class ExSession extends HttpServlet {

	

	public synchronized void doPost(HttpServletRequest request,HttpServletResponse response)

			throws IOException,ServletException {

		response.setContentType("text/html;charset=gb2312");

		PrintWriter out = response.getWriter();

		request.setCharacterEncoding("gb2312");

		

		HttpSession session = request.getSession();

		session.setAttribute("testName","test");

		out.println("<html><head><title>ExSession</title></head><body>");

		out.println("sessionAttribute:" + session.getAttribute("testName"));

		out.println("<a href = 'http://127.0.0.1:8080/testSession/ExS01.html'>");

		out.println("爱谁谁</a></body></html>");

		out.close();

	}

}

ExS01.html

<form method = "post" action = "ExSession01">

    	<p align = "left">

    		<font size = "5"><b>Font of Page</b></font>

    	</p>

    	<p></p>

    	<p align = "left">

    		<input type = "submit" value = "go to Sub Page">

    	</p>

    </form>

ExSession01.java

public class ExSession01 extends HttpServlet {

	public synchronized void doPost(HttpServletRequest request,HttpServletResponse response)

			throws IOException,ServletException {

		doGet(request,response);

	}

	

	public void doGet(HttpServletRequest request,HttpServletResponse response)

			throws IOException,ServletException {

		response.setContentType("text/html;charset=gb2312");

		PrintWriter out = response.getWriter();

		request.setCharacterEncoding("gb2312");

		

		HttpSession session = request.getSession();

		

		out.println("<html><head><title>Exsession01</title></head><body>");

		out.println("sessionAttribute:" + session.getAttribute("testName") + "<br>");

		

		out.println("</body></html>");

		out.close();

	}

}

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ay转身遇 2014-03-25

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public class ExSession01 extends HttpServlet {
    public synchronized void doPost(HttpServletRequest request,HttpServletResponse response)
            throws IOException,ServletException {
        doGet(request,response);
    }
     
    public void doGet(HttpServletRequest request,HttpServletResponse response)
            throws IOException,ServletException {
        response.setContentType("text/html;charset=gb2312");
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("gb2312");
         
        HttpSession session = request.getSession();
        System.out.println(session.getAttribute("testName") );//这样有值的对吧？
        out.println("<html><head><title>Exsession01</title></head><body>");
        out.println("sessionAttribute:" + session.getAttribute("testName") + "<br>");
         
        out.println("</body></html>");
        out.close();
    }
}