查看session的size

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><HTML><HEAD><%@ page language="java"contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><META name="GENERATOR" content="IBM WebSphere Studio"><TITLE>SessionObjects.jsp</TITLE></HEAD> <BODY><H1>Session Object List JSP</H1> This JSP will dump information about the current HTTPSession.<br><br> <%@ page import="java.io.*,java.util.*,javax.servlet.*" session="false" %><%! public void dumpSession(HttpServletRequest request, JspWriter out) throws IOException { HttpSession session = request.getSession(false); Object ro = null ; out.println("Session ID from session.getID : " + session.getId() + "<br>"); out.println("Session ID from getHeader: " + request.getHeader("Cookie") + "<br>"); Enumeration enum = session.getAttributeNames(); if ( enum.hasMoreElements() ) { int totalSize = 0; out.println("<h3>Session Objects:</h3>"); out.println("<TABLE Border=/"2/" WIDTH=/"65%/" BGCOLOR=/"#DDDDFF/">"); out.println("<tr><th>Name</th>");//<th>Object.toString()</th>"); out.println("<th>Raw Bytes</th><th>Size (bytes)</th></tr>"); while ( enum.hasMoreElements() ) { String name = (String)enum.nextElement(); Object sesobj = session.getAttribute(name) ; ObjectOutputStream oos = null; ByteArrayOutputStream bstream = new ByteArrayOutputStream(); try { oos = new ObjectOutputStream(bstream); oos.writeObject(sesobj); } catch (Exception e) { e.printStackTrace(); } finally { if (oos != null) { try {oos.flush();} catch (IOException ioe) {} try {oos.close();} catch (IOException ioe) {} } } ObjectInputStream ois = null; ro = null ; try { ois = new ObjectInputStream(new ByteArrayInputStream(bstream.toByteArray())); ro = ois.readObject(); } catch (Exception e) { e.printStackTrace(); } finally { if (ois != null) { try {ois.close();} catch (IOException ioe) {} } } totalSize += bstream.size(); out.println("<tr>");out.println("<td>" + name + "</td>"); // out.println("<td>" + session.getAttribute(name) + "</td>");out.println("<td>" + ro + "</td>"); out.println("<td>" + bstream.size() + " bytes </td></tr>"); } out.println("</table>"); out.println("Total Bytes: " + totalSize + "<br><br>"); } else { out.println("No objects in session"); } } %><% response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires",0); HttpSession session = request.getSession(false); if (session == null) { out.println("No session"); } else { dumpSession(request, out); } %></BODY>