cookie技術實質:
cookie技術的本質就是儲存浏覽器端的資訊,當使用者再次檢視上次浏覽的資訊時,就可以直接檢視到。缺點就是資料安全性低。
類代碼:(建立項目,再建立包,然後建立類,最後敲代碼,并配置web.xml資訊-----部署并啟動伺服器)
package com.ly.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CookieServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//設定請求編碼格式
req.setCharacterEncoding("utf-8");
//設定響應編碼格式
resp.setContentType("text/html;charset=utf-8");
//使用Cookie進行浏覽器端的資料存儲
//建立Cookie對象
Cookie c=new Cookie("mouse", "thinkpad");
Cookie c2=new Cookie("key", "pzhu");
//設定Cookie
//設定Cookie的有效期
c2.setMaxAge(3*24*3600);
//設定有效路徑
c2.setPath("/cookie/gc");
//響應 Cookie資訊
resp.addCookie(c);
resp.addCookie(c2);
//直接響應
resp.getWriter().write("Cookie學習");
}
}
web.xml配置:
<?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_2_5.xsd" id="WebApp_ID"
version="2.5">
<servlet>
<servlet-name>CookieServlet</servlet-name>
<servlet-class>com.ly.servlet.CookieServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CookieServlet</servlet-name>
<url-pattern>/cs</url-pattern>
</servlet-mapping>
</web-app>