?? sessionservlet.java
字號(hào):
import java.io.*;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* <p>Title: Servlet獲取會(huì)話</p>
* <p>Description: 這個(gè)簡(jiǎn)單的實(shí)例使用HttpSession類(lèi)跟蹤客戶(hù)端訪問(wèn)的次數(shù)。</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Filename: SessionServlet.java</p>
* @author 杜江
* @version 1.0
*/
//必須繼承HttpServlet類(lèi)
public class SessionServlet extends HttpServlet {
//doGet方法
public void doGet (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
//獲取會(huì)話對(duì)象，true表示如果這個(gè)對(duì)象不存在，則創(chuàng)建新的
HttpSession session = req.getSession(true);
// 設(shè)置內(nèi)容類(lèi)型
res.setContentType("text/html; charset=GB2312");
// 獲取PrintWriter對(duì)象
PrintWriter out = res.getWriter();
out.println("<HEAD><TITLE> " + "在Servlet中使用Session " +
"</TITLE></HEAD><BODY>");
out.println("<p>");
out.println("<h1> Servlet中使用Session實(shí)例 </h1>");
// 獲取Session變量
Integer ival = (Integer) session.getAttribute("counter");
if (ival==null)
ival = new Integer(1);
else
ival = new Integer(ival.intValue() + 1);
//設(shè)置Session變量
session.setAttribute("counter", ival);
out.println("你刷新或點(diǎn)擊這一頁(yè) <b>" + ival + "</b> 次.<p>");
out.println("點(diǎn)擊 <a href=" + res.encodeURL("SessionServlet") +
">這里</a>");
out.println(" 使的更新你的Session信息 " );
out.println("<p>");
out.println("<h3>請(qǐng)求和會(huì)話數(shù)據(jù):</h3>");
//獲得Session的id號(hào)
out.println("Session ID in Request: " +
req.getRequestedSessionId());
//判斷是否id好使用了cookie
out.println("<br>Session ID in Request from Cookie: " +
req.isRequestedSessionIdFromCookie());
//Session是否從表單提交的
out.println("<br>Session ID in Request from URL: " +
req.isRequestedSessionIdFromURL());
//當(dāng)前Session是否激活
out.println("<br>Valid Session ID: " +
req.isRequestedSessionIdValid());
out.println("<h3>Session信息:</h3>");
//當(dāng)前的Session是否首次建立
out.println("New Session: " + session.isNew());
//獲得這個(gè)Session的ID號(hào)
out.println("<br>Session ID: " + session.getId());
//創(chuàng)建這個(gè)會(huì)話的時(shí)間
out.println("<br>Creation Time: " + session.getCreationTime());
//客戶(hù)最后一次訪問(wèn)的時(shí)間
out.println("<br>Last Accessed Time: " +
session.getLastAccessedTime());
out.println("</BODY></html>");
}
}
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