📄 showsession.java
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package eg.cha10;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import util.ServletUtilities;
public class ShowSession extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession(true);
if (session.getAttribute("bily") == null) {
session.setAttribute("bily", new Date());
//这一段是为了演示session的作用时间，只要不关闭浏览器，会一直显示第一次访问本servlet时记录的时间
}
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Searching the Web";
String heading;
Integer accessCount = new Integer(0);
if (session.isNew()) {
heading = "Welcome, Newcomer";
} else {
heading = "Welcome Back";
Integer oldAccessCount =
(Integer) session.getAttribute("accessCount");
if (oldAccessCount != null) {
accessCount = new Integer(oldAccessCount.intValue() + 1);
}
}
session.setAttribute("accessCount", accessCount);
out.println(ServletUtilities.headWithTitle(title) + "<BODY BGCOLOR=\"#FDF5E6\">\n"
+ "<H1 ALIGN=\"CENTER\">" + heading + "</H1>\n" + session.getAttribute("bily") + "\n"
+ "<H2>Information on Your Session:</H2>\n" + "<TABLE BORDER=1 ALIGN=CENTER>\n"
+ "<TR BGCOLOR=\"#FFAD00\">\n" + " <TH>Info Type<TH>Value\n" + "<TR>\n"
+ " <TD>ID\n" + " <TD>" + session.getId() + "\n" + "<TR>\n"
+ " <TD>Creation Time\n" + " <TD>" + new Date(session.getCreationTime()) + "\n"
+ "<TR>\n" + " <TD>Time of Last Access\n" + " <TD>"
+ new Date(session.getLastAccessedTime()) + "\n" + "<TR>\n"
+ " <TD>Number of Previous Accesses\n" + " <TD>" + accessCount + "\n"
+ "</TABLE>\n" + "</BODY></HTML>");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
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