JavaWeb/src/javaweb/SessionTrack.java · notfand/LearnJava

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LearnJava

JavaWeb

src

javaweb

SessionTrack.java

SessionTrack.java 3.10 KB

package javaweb;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

@WebServlet(name = "SessionTrack", urlPatterns = "/sessionTrack")
public class SessionTrack extends HttpServlet {
 public void doGet(HttpServletRequest request,
 HttpServletResponse response)
 throws ServletException, IOException {
 // 如果不存在 session 会话,则创建一个 session 对象
 HttpSession session = request.getSession(true);
 // 获取 session 创建时间
 Date createTime = new Date(session.getCreationTime());
 // 获取该网页的最后一次访问时间
 Date lastAccessTime = new Date(session.getLastAccessedTime());

String title = "欢迎回到我的网站";
 Integer visitCount = 0;
 String visitCountKey = "visitCount";
 String userIDKey = "userID";
 String userID = "ABCD";

session.setAttribute(visitCountKey, visitCount);
 // 检查网页上是否有新的访问者
 if (session.isNew()) {
 title = "欢迎来到我的网站";
 session.setAttribute(userIDKey, userID);
 } else {
 visitCount = (Integer) session.getAttribute(visitCountKey);
 visitCount = visitCount + 1;
 userID = (String) session.getAttribute(userIDKey);
 }
 session.setAttribute(visitCountKey, visitCount);

// 设置响应内容类型
 response.setContentType("text/html");
 PrintWriter out = response.getWriter();

String docType =
 "<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
 out.println(docType +
 "<html>\n" +
 "<head><title>" + title + "</title></head>\n" +
 "<body bgcolor=\"#f0f0f0\">\n" +
 "<h1 align=\"center\">" + title + "</h1>\n" +
 "<h2 align=\"center\">Session 信息</h2>\n" +
 "<table border=\"1\" align=\"center\">\n" +
 "<tr bgcolor=\"#949494\">\n" +
 " <th>Session 信息</th><th>值</th></tr>\n" +
 "<tr>\n" +
 " <td>id</td>\n" +
 " <td>" + session.getId() + "</td></tr>\n" +
 "<tr>\n" +
 " <td>Creation Time</td>\n" +
 " <td>" + createTime +
 " </td></tr>\n" +
 "<tr>\n" +
 " <td>Time of Last Access</td>\n" +
 " <td>" + lastAccessTime +
 " </td></tr>\n" +
 "<tr>\n" +
 " <td>User ID</td>\n" +
 " <td>" + userID +
 " </td></tr>\n" +
 "<tr>\n" +
 " <td>Number of visits</td>\n" +
 " <td>" + visitCount + "</td></tr>\n" +
 "</table>\n" +
 "</body></html>");
 }
}

一键复制编辑原始数据按行查看历史

yswift 提交于 2020年04月13日 18:10 +08:00 . 用H2替换mysql

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package javaweb;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

@WebServlet(name = "SessionTrack", urlPatterns = "/sessionTrack")
public class SessionTrack extends HttpServlet {
 public void doGet(HttpServletRequest request,
 HttpServletResponse response)
 throws ServletException, IOException {
 // 如果不存在 session 会话,则创建一个 session 对象
 HttpSession session = request.getSession(true);
 // 获取 session 创建时间
 Date createTime = new Date(session.getCreationTime());
 // 获取该网页的最后一次访问时间
 Date lastAccessTime = new Date(session.getLastAccessedTime());

 String title = "欢迎回到我的网站";
 Integer visitCount = 0;
 String visitCountKey = "visitCount";
 String userIDKey = "userID";
 String userID = "ABCD";

 session.setAttribute(visitCountKey, visitCount);
 // 检查网页上是否有新的访问者
 if (session.isNew()) {
 title = "欢迎来到我的网站";
 session.setAttribute(userIDKey, userID);
 } else {
 visitCount = (Integer) session.getAttribute(visitCountKey);
 visitCount = visitCount + 1;
 userID = (String) session.getAttribute(userIDKey);
 }
 session.setAttribute(visitCountKey, visitCount);

 // 设置响应内容类型
 response.setContentType("text/html");
 PrintWriter out = response.getWriter();

 String docType =
 "<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
 out.println(docType +
 "<html>\n" +
 "<head><title>" + title + "</title></head>\n" +
 "<body bgcolor=\"#f0f0f0\">\n" +
 "<h1 align=\"center\">" + title + "</h1>\n" +
 "<h2 align=\"center\">Session 信息</h2>\n" +
 "<table border=\"1\" align=\"center\">\n" +
 "<tr bgcolor=\"#949494\">\n" +
 " <th>Session 信息</th><th>值</th></tr>\n" +
 "<tr>\n" +
 " <td>id</td>\n" +
 " <td>" + session.getId() + "</td></tr>\n" +
 "<tr>\n" +
 " <td>Creation Time</td>\n" +
 " <td>" + createTime +
 " </td></tr>\n" +
 "<tr>\n" +
 " <td>Time of Last Access</td>\n" +
 " <td>" + lastAccessTime +
 " </td></tr>\n" +
 "<tr>\n" +
 " <td>User ID</td>\n" +
 " <td>" + userID +
 " </td></tr>\n" +
 "<tr>\n" +
 " <td>Number of visits</td>\n" +
 " <td>" + visitCount + "</td></tr>\n" +
 "</table>\n" +
 "</body></html>");
 }
}