会话 session 和 cookie（6）_Cookie 中文处理

目录

• ​​Cookie 中文处理​​

Cookie 中文处理

1. Cookie 中是不可以设置中文的，但可以使用 URLEncodor.encode() 方法编码后在存放到 Cookie 中。在获取 Cookie 时，需要先使用 URLDecoder.decode() 方法解码再使用。
   向客户端响应中添加 Cookie
   
   
   从客户端请求中获取 Cookie
   

2. 以上操作完整源码
   web.xml

   <?xml version="1.0" encoding="UTF-8"?>
   <web-app version="2.5" 
     xmlns="http://java.sun.com/xml/ns/javaee" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
     
     <servlet>
       <servlet-name>RegistServlet</servlet-name>
       <servlet-class>com.wyx.cookie.RegistServlet</servlet-class>
     </servlet>
     <servlet-mapping>
       <servlet-name>RegistServlet</servlet-name>
       <url-pattern>/servlet/RegistServlet</url-pattern>
     </servlet-mapping>
     
      <servlet>
       <servlet-name>GetCookieServlet</servlet-name>
       <servlet-class>com.wyx.cookie.GetCookieServlet</servlet-class>
     </servlet>
     <servlet-mapping>
      <servlet-name>GetCookieServlet</servlet-name>
       <url-pattern>/servlet/GetCookieServlet</url-pattern>
     </servlet-mapping>
     
   </web-app>

   RegistServlet

   package com.wyx.cookie;
   
   import java.io.IOException;
   import java.net.URLEncoder;
   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 RegistServlet extends HttpServlet
   {
   
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
         throws ServletException, IOException
     {
       doPost(req, resp);
     }
   
     @Override
     protected void doPost(HttpServletRequest req, HttpServletResponse resp)
         throws ServletException, IOException
     {
       req.setCharacterEncoding("UTF-8");
       String name = "魏宇轩";
       name = URLEncoder.encode(name);
   
       // cookie中存储中文会报错
       Cookie cookie = new Cookie("userpass", name);
       cookie.setMaxAge(60 * 60);
       cookie.setPath("/cookie_demo4/");
       resp.addCookie(cookie);
       resp.getWriter().print("success");
     }
   }

   GetCookieServlet

   package com.wyx.cookie;
   
   import java.io.IOException;
   import java.net.URLDecoder;
   import java.net.URLEncoder;
   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 GetCookieServlet extends HttpServlet
   {
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
         throws ServletException, IOException
     {
       Cookie[] cookies = req.getCookies();
       for (Cookie cookie : cookies)
       {
         String name = cookie.getName();
         if ("userpass".equals(name))
         {
           // 获得是Base64编码后的字符串
           String value = cookie.getValue();
           System.out.println(value);
           value = URLDecoder.decode(value);
           System.out.println(value);
         }
       }
     }
   }

   工程文件下载

如有错误，欢迎指正！