java web基础 --- session_sessiontrackdemo-优快云博客

本文链接：https://blog.youkuaiyun.com/bolininahuaalex/article/details/50412518

本文介绍了一个Java Servlet实现的session跟踪与管理示例，包括session创建、更新及访问信息展示。

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SessionTrackServlet.java

package com.web1.hello;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class SessionTrackServlet
 */
@WebServlet("/SessionTrackServlet")
public class SessionTrackServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
    public static final String USER_KEY = "userName";
    public static final String VISITOR_KEY = "visitorCount";
    
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SessionTrackServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) 
			throws ServletException, IOException {
		HttpSession session = request.getSession(true);
		String sessionId = session.getId();
		//获取创建时间
		Date createDate = new Date(session.getCreationTime());
		//上次访问时间
		Date lastAccessDate = new Date(session.getLastAccessedTime());
		String userName = "gloomyfish";
		Integer visitCount = 1;
		if (session.isNew()) {
			session.setMaxInactiveInterval(120);
			session.setAttribute(USER_KEY, userName);
			session.setAttribute(VISITOR_KEY, visitCount);
		}else{
			userName = (String) session.getAttribute(USER_KEY);
			visitCount = (Integer) session.getAttribute(VISITOR_KEY);
			visitCount++;
			session.setAttribute(VISITOR_KEY, visitCount);
		}
		// start to response
		response.setHeader("Content-type", "text/html;charset=UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		response.setCharacterEncoding("UTF-8");
		
		Cookie cookie = new Cookie("JSESSIONID", sessionId);
		cookie.setHttpOnly(true);
		response.addCookie(cookie);
		
		PrintWriter  writer = response.getWriter();
		startWebPage(writer);
		
		writer.print("<p>");
		writer.print("Session ID:" + sessionId);
		writer.print("</p>");
		
		writer.print("<p>");
		writer.print("创建时间:" + createDate.toString());
		writer.print("</p>");
		
		writer.print("<p>");
		writer.print("上次访问时间:" + lastAccessDate.toString());
		writer.print("</p>");
		
		writer.print("<p>");
		writer.print("访问次数:" + visitCount);
		writer.print("</p>");
		
		writer.print("<p>");
		writer.print("访问用户:" + userName);
		writer.print("</p>");
		endWebPage(writer);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}
	
	private void startWebPage(PrintWriter writer){
		writer.print("<html>");
		writer.print("<head>");
		writer.print("<title>");
		writer.print("Session Tracking Demo...");
		writer.print("</title>");
		writer.print("</head>");
		writer.print("<body>");
		writer.print("<h1>Session Tracking Example</h1>");
	}
	
	private void endWebPage(PrintWriter writer){
		writer.print("</body>");
		writer.print("</html>");
	}

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" metadata-complete="true" version="3.0">
  <description>
		 Hello World Servlet
	</description>
  <display-name>Hello World Servlet</display-name>
  <filter>
    <filter-name>Encode Filter</filter-name>
    <filter-class>com.web1.util.RequestEncodeFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>Encode Filter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <filter>
    <filter-name>URLOverFilter Filter</filter-name>
    <filter-class>com.web1.util.URLOverWriteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>URLOverFilter Filter</filter-name>
    <url-pattern>/home.html</url-pattern>
  </filter-mapping>
  
  <servlet>
    <servlet-name>helloWorld</servlet-name>
    <servlet-class>com.web1.hello.HelloWorldServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>helloWorld</servlet-name>
    <url-pattern>/helloWorld</url-pattern>
  </servlet-mapping>
  
  <servlet>
    <servlet-name>helloImage</servlet-name>
    <servlet-class>com.web1.hello.ImageServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>helloImage</servlet-name>
    <url-pattern>/helloImage</url-pattern>
  </servlet-mapping>
  
  <servlet>
    <servlet-name>Session Track</servlet-name>
    <servlet-class>com.web1.hello.SessionTrackServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Session Track</servlet-name>
    <url-pattern>/sessionTrack</url-pattern>
  </servlet-mapping>
</web-app>