📄 sessioninfoservlet.java
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package s1;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."; }}⌨️ 快捷键说明
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