添加：显示上次访问时间的cookies

2025-03-24 14:05:22 +08:00
parent 4f4664995c
commit 255c56378d
3 changed files with 106 additions and 25 deletions
@@ -0,0 +1,67 @@
+package com.msksbr.test.servlet.servlet.cookies;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.annotation.WebServlet;
+import jakarta.servlet.http.Cookie;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+import java.net.URLDecoder;
+import java.net.URLEncoder;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+@WebServlet(
+        name = "lastAccessServlet",
+        urlPatterns = "/cookies/last-access-servlet"
+)
+public class LastAccessServlet extends HttpServlet {
+    private static final long serialVersionUID = 1L;
+
+    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.setContentType("text/html;charset=UTF-8");
+        Cookie[] cookies = request.getCookies();
+        boolean flag = false;
+        if (cookies.length > 0 && cookies != null) {
+            for (Cookie cookie : cookies) {
+                String name = cookie.getName();
+                if ("lastTime".equals(name)) {
+                    flag = true;
+                    String value = cookie.getValue();
+                    System.out.println("解码前：" + value);
+                    value = URLDecoder.decode(value, "UTF-8");
+                    cookie.setValue("解码后：" + value);
+                    response.getWriter().write("欢迎回来，您上次访问时间" + "为：" + value);
+                    Date date = new Date();
+                    SimpleDateFormat timesdf = new SimpleDateFormat("yyyy年MM" + "月dd日 HH:mm:ss");
+                    String str_time = timesdf.format(date);
+                    System.out.println("编码前：" + str_time);
+                    str_time = URLEncoder.encode(str_time, "UTF-8");
+                    System.out.println("编码后：" + str_time);
+                    cookie.setValue(str_time);
+                    cookie.setMaxAge(60 * 60 * 24 * 30);
+                    response.addCookie(cookie);
+                    break;
+                }
+            }
+            if (cookies == null || cookies.length == 0 || !flag) {
+                Date date = new Date();
+                SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日" + "HH:mm:ss");
+                String str_date = sdf.format(date);
+                System.out.println("编码前：" + str_date);
+                str_date = URLEncoder.encode(str_date, "UTF-8");
+                System.out.println("编码后：" + str_date);
+                Cookie cookie = new Cookie("lastTime", str_date);
+                cookie.setMaxAge(60 * 60 * 24 * 30);
+                response.addCookie(cookie);
+                response.getWriter().write("您好，欢迎您首次访问");
+            }
+        }
+    }
+
+    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        this.doPost(request, response);
+    }
+}