Session, Session 是一个篮子
只要是同一套有父子关系的窗口，都可以访问到同一个 Session。
启发 ：默认 session 是依赖 cookie 的。若cookie完全禁用后解决方案 ： 重写URL。
新浪邮箱 ： 做学问不严谨。不像IBM等这样的大公司。
+ "<a href=" + response.encodeURL(request.getRequestURL().toString()) + ">test</a><BR>"
+ "<a href=" + request.getRequestURI().toString() + ">test</a>"
china-pub买书，例如 ： 最近浏览的列表，一般是写cookie里面了。
Session , Session 是一个篮子
只要是同一套有父子关系的窗口，都可以访问到同一个 Session。启发 ：默认 session 是依赖 cookie 的。若cookie完全禁用后解决方案 ： 重写URL。
新浪邮箱 ： 做学问不严谨。不像IBM等这样的大公司。
+ "<a href=" + response.encodeURL(request.getRequestURL().toString()) + ">test</a><BR>"
+ "<a href=" + request.getRequestURI().toString() + ">test</a>"
china-pub买书，例如 ： 最近浏览的列表，一般是写cookie里面了。
SessionInfoServlet.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
/**
* 用于演示Servlet API中的Session管理机制
*/
public class SessionInfoServlet extends HttpServlet {
/**
* Builds an HTML document containing session information and returns it to
* the client.
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// get current session or, if necessary, create a new one
HttpSession mySession = request.getSession(true);
// MIME type to return is HTML
response.setContentType("text/html");
// get a handle to the output stream
PrintWriter out = response.getWriter();
// generate HTML document
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>Session Info Servlet</TITLE>");
out.println("</HEAD>");
out.println("<BODY>");
out.println("<H3>Session Information</H3>");
out.println("New Session: " + mySession.isNew());
out.println("<BR>Session ID: " + mySession.getId());
out.println("<BR>Session Creation Time: "
+ new java.util.Date(mySession.getCreationTime()));
out.println("<BR>Session Last Accessed Time: "
+ new java.util.Date(mySession.getLastAccessedTime()));
out.println("<H3>Request Information</H3>");
out.println("Session ID from Request: "
+ request.getRequestedSessionId());
out.println("<BR>Session ID via Cookie: "
+ request.isRequestedSessionIdFromCookie());
out.println("<BR>Session ID via rewritten URL: "
+ request.isRequestedSessionIdFromURL());
out.println("<BR>Valid Session ID: "
+ request.isRequestedSessionIdValid());
out.println("</BODY></HTML>");
out.close(); // close output stream
}
/**
* Returns a brief description of this servlet.
*
* @return Brief description of servlet
*/
public String getServletInfo() {
return "Servlet returns session information.";
}
}--ShowSession.javaimport java.io.*;
import java.net.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
// Session 追踪
public class ShowSession extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Session Tracking Example";
HttpSession session = request.getSession(true); // 在服务器端找不到则创建一个，这是 true 的含义，客户端带不回来
String heading;
// Use getAttribute instead of getValue in version 2.2.
Integer accessCount = (Integer) session.getAttribute("accessCount"); // 计数的功能
if (accessCount == null) {
accessCount = new Integer(0);
heading = "Welcome, Newcomer";
} else {
heading = "Welcome Back";
accessCount = new Integer(accessCount.intValue() + 1);
}
// Use setAttribute instead of putValue in version 2.2.
session.setAttribute("accessCount", accessCount);
out.println("<html><head><title>Session追踪</title></head>"
+ "<BODY BGCOLOR="#FDF5E6">
" + "<H1 ALIGN="CENTER">"
+ heading
+ "</H1>
"
+ "<H2>Information on Your Session:</H2>
"
+ "<TABLE BORDER=1 ALIGN="CENTER">
"
+ "<TR BGCOLOR="#FFAD00">
"
+ " <TH>Info Type<TH>Value
"
+ "<TR>
"
+ " <TD>ID
"
+ " <TD>"
+ session.getId()
+ "
"
+ "<TR>
"
+ " <TD>Creation Time
"
+ " <TD>"
+ new Date(session.getCreationTime())
+ "
"
+ "<TR>
"
+ " <TD>Time of Last Access
"
+ " <TD>"
+ new Date(session.getLastAccessedTime())
+ "
"
+ "<TR>
"
+ " <TD>Number of Previous Accesses
"
+ " <TD>"
+ accessCount + "
" + "</TABLE>
" + "</BODY></HTML>");
}
/** Handle GET and POST requests identically. */
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
URLSession.javaimport java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
import java.util.*;
//Session追踪
public class URLSession extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
HttpSession session = request.getSession(true);
out.println("<html><head><title>Session追踪</title></head>"
+ "<BODY>
"
+ "session id:" + session.getId() + "<br>"
+ "from url:" + request.isRequestedSessionIdFromURL() + "<br>"
+ "from cookie:" + request.isRequestedSessionIdFromCookie() + "<br>"
+ "<a href=" + response.encodeURL(request.getRequestURL().toString()) + ">test</a><BR>"
+ "<a href=" + request.getRequestURI().toString() + ">test</a>"
+ "</BODY></HTML>");
}
/** Handle GET and POST requests identically. */
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}